{"example_id": "perception_00000", "split": "perception", "task_type": "board_print", "fen": "r3k2r/1b3p2/4qP1p/p2pP1p1/1ppP3P/2P2NK1/PP1NQ3/R7 b kq - 2 28", "prompt": "Position (FEN): r3k2r/1b3p2/4qP1p/p2pP1p1/1ppP3P/2P2NK1/PP1NQ3/R7 b kq - 2 28\nShow me the board.", "gold_answer": "8 r . . . k . . r\n7 . b . . . p . .\n6 . . . . q P . p\n5 p . . p P . p .\n4 . p p P . . . P\n3 . . P . . N K .\n2 P P . N Q . . .\n1 R . . . . . . .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00001", "split": "perception", "task_type": "board_to_fen", "fen": "8/8/p4K2/8/P7/1k6/8/8 b - - 2 58", "prompt": "Here is the current board:\n8 . . . . . . . .\n7 . . . . . . . .\n6 p . . . . K . .\n5 . . . . . . . .\n4 P . . . . . . .\n3 . k . . . . . .\n2 . . . . . . . .\n1 . . . . . . . .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 2\nFullmove number: 58\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "8/8/p4K2/8/P7/1k6/8/8 b - - 2 58", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00002", "split": "perception", "task_type": "piece_id", "fen": "r7/pkp5/1p3QNp/8/1P6/2P3P1/P2P1PbP/R1K2R2 w - - 1 29", "prompt": "FEN: r7/pkp5/1p3QNp/8/1P6/2P3P1/P2P1PbP/R1K2R2 w - - 1 29\nWhat piece is on a2?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "a2"}} {"example_id": "perception_00003", "split": "perception", "task_type": "material_count", "fen": "rn2kb1N/pp3Bpp/3q4/2p1n3/6N1/3P2P1/PPP4P/R1B1KR2 b q - 6 21", "prompt": "FEN: rn2kb1N/pp3Bpp/3q4/2p1n3/6N1/3P2P1/PPP4P/R1B1KR2 b q - 6 21\nWhat is the material count for both sides?", "gold_answer": "White (13 pieces): 2 bishops, 1 king, 2 knights, 6 pawns, 2 rooks. Black (11 pieces): 1 bishop, 1 king, 2 knights, 5 pawns, 1 queen, 1 rook. Material is equal.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00004", "split": "perception", "task_type": "square_lookup", "fen": "rn1qkb1r/pp2pppp/2p2n2/5b2/2pP1B2/2N1P3/PP3PPP/R2QKBNR w KQkq -", "prompt": "FEN: rn1qkb1r/pp2pppp/2p2n2/5b2/2pP1B2/2N1P3/PP3PPP/R2QKBNR w KQkq -\nWhat is on f2?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "f2=white pawn", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "f2", "diagnostic": true, "hard_gate": false, "square": "f2"}} {"example_id": "perception_00005", "split": "perception", "task_type": "rank_lookup", "fen": "r1bq1rk1/1p2bppp/2nppn2/p5B1/4P3/1NN5/PPPQ1PPP/2KR1B1R w - -", "prompt": "FEN: r1bq1rk1/1p2bppp/2nppn2/p5B1/4P3/1NN5/PPPQ1PPP/2KR1B1R w - -\nWhat is the compressed FEN row for rank 4?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 4: 4P3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "4", "_rank_lookup_row": "4P3", "diagnostic": true, "hard_gate": false, "rank": "4", "fen_rank_row": "4P3"}} {"example_id": "perception_00006", "split": "perception", "task_type": "square_coordinates", "fen": "r6r/pQkn2b1/5p2/N6B/3P4/2N5/PPP3PP/4RbK1 b - - 0 23", "prompt": "FEN: r6r/pQkn2b1/5p2/N6B/3P4/2N5/PPP3PP/4RbK1 b - - 0 23\nFor square a2, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "a2: file=a; rank=2; fen_row_from_top=7; file_index=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "a2", "diagnostic": true, "hard_gate": false, "square": "a2"}} {"example_id": "perception_00007", "split": "perception", "task_type": "fen_rank_expansion", "fen": "rn1B1rk1/p5pp/2p5/1p1n4/8/1BP3P1/PP3PP1/R2bR1K1 w - - 0 18", "prompt": "FEN: rn1B1rk1/p5pp/2p5/1p1n4/8/1BP3P1/PP3PP1/R2bR1K1 w - - 0 18\nCompressed rank 2 row: PP3PP1\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 2: a=P; b=P; c=1; d=1; e=1; f=P; g=P; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "2", "_fen_rank_expansion_row": "PP3PP1", "diagnostic": true, "hard_gate": false, "rank": "2", "fen_rank_row": "PP3PP1"}} {"example_id": "perception_00008", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "1r2r1k1/1p1q1ppp/p1p2n2/P1Pp4/N2Pp2n/B3P2P/3NQPP1/1R2K2R w K - 3 22", "prompt": "Rank 4 row before: N2Pp2n\nFile g changes from 1 to P. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 4: N2Pp2n -> N2Pp1Pn", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "g2g4", "_fen_rank_cell_edit_square": "g4", "_fen_rank_cell_edit_rank": "4", "_fen_rank_cell_edit_file": "g", "_fen_rank_cell_edit_before_row": "N2Pp2n", "_fen_rank_cell_edit_after_row": "N2Pp1Pn", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "P", "diagnostic": true, "hard_gate": false, "move": "g2g4", "square": "g4", "rank": "4", "file": "g", "before_row": "N2Pp2n", "after_row": "N2Pp1Pn", "before_fen": "1", "after_fen": "P"}} {"example_id": "perception_00009", "split": "perception", "task_type": "fen_board_edit", "fen": "r2qkb1r/ppp3pp/8/3p4/2n2B2/8/PP3PPP/RN1QK2R w KQkq - 0 12", "prompt": "Board FEN before: r2qkb1r/ppp3pp/8/3p4/2n2B2/8/PP3PPP/RN1QK2R\nApply square edits: f4 B->1; d6 1->B\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: r2qkb1r/ppp3pp/3B4/3p4/2n5/8/PP3PPP/RN1QK2R", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "f4d6", "_fen_board_edit_board_fen_before": "r2qkb1r/ppp3pp/8/3p4/2n2B2/8/PP3PPP/RN1QK2R", "_fen_board_edit_board_fen_after": "r2qkb1r/ppp3pp/3B4/3p4/2n5/8/PP3PPP/RN1QK2R", "_fen_board_edit_edit_text": "f4 B->1; d6 1->B", "_fen_board_edit_changed_squares": [{"square": "f4", "before": "white bishop", "after": "empty", "before_fen": "B", "after_fen": "1"}, {"square": "d6", "before": "empty", "after": "white bishop", "before_fen": "1", "after_fen": "B"}], "diagnostic": true, "hard_gate": false, "move": "f4d6", "board_fen_before": "r2qkb1r/ppp3pp/8/3p4/2n2B2/8/PP3PPP/RN1QK2R", "board_fen_after": "r2qkb1r/ppp3pp/3B4/3p4/2n5/8/PP3PPP/RN1QK2R", "edit_text": "f4 B->1; d6 1->B", "changed_squares": [{"square": "f4", "before": "white bishop", "after": "empty", "before_fen": "B", "after_fen": "1"}, {"square": "d6", "before": "empty", "after": "white bishop", "before_fen": "1", "after_fen": "B"}]}} {"example_id": "perception_00010", "split": "perception", "task_type": "move_square_edits", "fen": "4r1k1/1p1n1pp1/1b5p/p1p5/3p1N2/P2P1NPP/1PP3P1/R5K1 w - - 2 23", "prompt": "Starting FEN: 4r1k1/1p1n1pp1/1b5p/p1p5/3p1N2/P2P1NPP/1PP3P1/R5K1 w - - 2 23\nMove: f4g6\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: f4=white knight; g6=empty.\nSquares: f4 white knight->empty; g6 empty->white knight.\nRanks: rank 4 f N->1; rank 6 g 1->N.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "f4g6", "diagnostic": true, "hard_gate": false, "move": "f4g6"}} {"example_id": "perception_00011", "split": "perception", "task_type": "fen_assembly", "fen": "r1b1k1r1/1pq2pp1/p2ppb1p/2n5/3NPPP1/2N4Q/PPP3BP/2KR3R w q -", "prompt": "Starting FEN: r1b1k1r1/1pq2pp1/p2ppb1p/2n5/3NPPP1/2N4Q/PPP3BP/2KR3R w q - 0 1\nMove: d4b3\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: q\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white knight d4b3.\nLookup: d4=white knight; b3=empty.\nSquares: d4 white knight->empty; b3 empty->white knight.\nRanks: rank 4 d N->1; rank 3 b 1->N.\nResult FEN: r1b1k1r1/1pq2pp1/p2ppb1p/2n5/4PPP1/1NN4Q/PPP3BP/2KR3R b q - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "d4b3", "diagnostic": true, "hard_gate": false, "move": "d4b3"}} {"example_id": "perception_00012", "split": "perception", "task_type": "fen_row_application", "fen": "2kr3r/ppp1p3/6pp/3b1pN1/6n1/1P1P4/PR1P1PPP/4R1K1 w - - 0 18", "prompt": "Starting FEN: 2kr3r/ppp1p3/6pp/3b1pN1/6n1/1P1P4/PR1P1PPP/4R1K1 w - - 0 18\nMove: b2c2\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 18\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 2 PR1P1PPP->P1RP1PPP.\nResult FEN: 2kr3r/ppp1p3/6pp/3b1pN1/6n1/1P1P4/P1RP1PPP/4R1K1 b - - 1 18", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "b2c2", "_fen_row_application_rank_rewrites": [{"rank": "2", "before": "PR1P1PPP", "after": "P1RP1PPP"}], "diagnostic": true, "hard_gate": false, "move": "b2c2", "rank_rewrites": [{"rank": "2", "before": "PR1P1PPP", "after": "P1RP1PPP"}]}} {"example_id": "perception_00013", "split": "perception", "task_type": "state_tracking", "fen": "r1b1kb1r/pppp1ppp/5n2/4q3/8/P3P3/1PP1BPPP/RNBQK2R b KQkq - 2 7", "prompt": "Starting FEN: r1b1kb1r/pppp1ppp/5n2/4q3/8/P3P3/1PP1BPPP/RNBQK2R b KQkq - 2 7\nAfter the moves h7h6, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 2\nFullmove number: 7\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r1b1kb1r/pppp1pp1/5n1p/4q3/8/P3P3/1PP1BPPP/RNBQK2R w KQkq - 0 8", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "h7h6", "_state_tracking_result": "r1b1kb1r/pppp1pp1/5n1p/4q3/8/P3P3/1PP1BPPP/RNBQK2R w KQkq - 0 8"}} {"example_id": "perception_00014", "split": "perception", "task_type": "material_inventory", "fen": "8/2p1QN1p/2B1bnp1/3r4/6kP/2P5/3NPP2/R3K1R1 b Q - 1 34", "prompt": "FEN: 8/2p1QN1p/2B1bnp1/3r4/6kP/2P5/3NPP2/R3K1R1 b Q - 1 34\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=e1; queen=e7; rook=a1,g1; bishop=c6; knight=d2,f7; pawn=e2,f2,c3,h4.\nBlack inventory: king=g4; queen=none; rook=d5; bishop=e6; knight=f6; pawn=g6,c7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00015", "split": "perception", "task_type": "material_piece_counts", "fen": "3r3k/p2bR2p/3p4/1ppP1p2/5n2/P1N2B1P/1PP2KP1/8 w - - 1 27", "prompt": "FEN: 3r3k/p2bR2p/3p4/1ppP1p2/5n2/P1N2B1P/1PP2KP1/8 w - - 1 27\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=1; bishop=1; knight=1; pawn=6.\nBlack counts: king=1; queen=0; rook=1; bishop=1; knight=1; pawn=6.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00016", "split": "perception", "task_type": "material_value_totals", "fen": "2b5/5pp1/pp2kn1p/3p4/5B2/P3PP2/1P1KB1PP/8 w - - 0 27", "prompt": "FEN: 2b5/5pp1/pp2kn1p/3p4/5B2/P3PP2/1P1KB1PP/8 w - - 0 27\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=0; bishop=6; knight=0; pawn=6; total=12.\nBlack values: king=0; queen=0; rook=0; bishop=3; knight=3; pawn=6; total=12.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00017", "split": "perception", "task_type": "material_balance_trace", "fen": "6k1/1p4b1/p1q1p2p/3pP3/P2P3p/6B1/1P2Q1PK/2r5 w - - 0 29", "prompt": "FEN: 6k1/1p4b1/p1q1p2p/3pP3/P2P3p/6B1/1P2Q1PK/2r5 w - - 0 29\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=h2; queen=e2; rook=none; bishop=g3; knight=none; pawn=b2,g2,a4,d4,e5 | black king=g8; queen=c6; rook=c1; bishop=g7; knight=none; pawn=h4,d5,a6,e6,h6,b7\nCounts: white king=1; queen=1; rook=0; bishop=1; knight=0; pawn=5 | black king=1; queen=1; rook=1; bishop=1; knight=0; pawn=6\nValues: white total=17; black total=23\nBalance: Black is up 6 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00018", "split": "perception", "task_type": "multi_state_tracking", "fen": "8/8/8/8/8/2K5/8/1k2R3 b - -", "prompt": "Starting FEN: 8/8/8/8/8/2K5/8/1k2R3 b - - 0 1\nAfter the moves b1a2 e1c1, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 8/8/8/8/8/2K5/k7/2R5 b - - 2 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "b1a2 e1c1", "_multi_state_tracking_result": "8/8/8/8/8/2K5/k7/2R5 b - - 2 2", "diagnostic": true, "hard_gate": false, "moves": "b1a2 e1c1"}} {"example_id": "perception_00019", "split": "perception", "task_type": "board_print", "fen": "r2qkbnr/pp3p1p/2b1p1p1/2ppP3/8/1P1P4/PBP1QPPP/RN2K1NR b KQkq - 0 8", "prompt": "Position (FEN): r2qkbnr/pp3p1p/2b1p1p1/2ppP3/8/1P1P4/PBP1QPPP/RN2K1NR b KQkq - 0 8\nShow me the board.", "gold_answer": "8 r . . q k b n r\n7 p p . . . p . p\n6 . . b . p . p .\n5 . . p p P . . .\n4 . . . . . . . .\n3 . P . P . . . .\n2 P B P . Q P P P\n1 R N . . K . N R\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00020", "split": "perception", "task_type": "board_to_fen", "fen": "8/8/6K1/6p1/2k1BbP1/5P2/8/8 b - - 24 78", "prompt": "Here is the current board:\n8 . . . . . . . .\n7 . . . . . . . .\n6 . . . . . . K .\n5 . . . . . . p .\n4 . . k . B b P .\n3 . . . . . P . .\n2 . . . . . . . .\n1 . . . . . . . .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 24\nFullmove number: 78\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "8/8/6K1/6p1/2k1BbP1/5P2/8/8 b - - 24 78", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00021", "split": "perception", "task_type": "piece_id", "fen": "r1bqkbnr/ppp2ppp/2n5/8/3p4/1P3N2/PBPPPPPP/RN1QKB1R b KQkq - 1 5", "prompt": "FEN: r1bqkbnr/ppp2ppp/2n5/8/3p4/1P3N2/PBPPPPPP/RN1QKB1R b KQkq - 1 5\nWhat piece is on h2?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "h2"}} {"example_id": "perception_00022", "split": "perception", "task_type": "material_count", "fen": "r2qkbnr/ppp2ppp/8/4p3/Q1BnP3/2N2P2/PP3P1P/R1B1K2R b KQkq - 1 8", "prompt": "FEN: r2qkbnr/ppp2ppp/8/4p3/Q1BnP3/2N2P2/PP3P1P/R1B1K2R b KQkq - 1 8\nWhat is the material count for both sides?", "gold_answer": "White (13 pieces): 2 bishops, 1 king, 1 knight, 6 pawns, 1 queen, 2 rooks. Black (14 pieces): 1 bishop, 1 king, 2 knights, 7 pawns, 1 queen, 2 rooks. Black is up 1 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00023", "split": "perception", "task_type": "square_lookup", "fen": "2q3k1/1p1nb1pn/p2p3p/3Pp3/1P2N3/P1Q2N2/1B3PPP/6K1 b - - 1 25", "prompt": "FEN: 2q3k1/1p1nb1pn/p2p3p/3Pp3/1P2N3/P1Q2N2/1B3PPP/6K1 b - - 1 25\nWhat is on g7?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "g7=black pawn", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "g7", "diagnostic": true, "hard_gate": false, "square": "g7"}} {"example_id": "perception_00024", "split": "perception", "task_type": "rank_lookup", "fen": "r1bq1rk1/ppp2ppp/5n2/3p4/3NP3/3P3P/PPP1BKP1/R1BQ1R2 b - - 1 11", "prompt": "FEN: r1bq1rk1/ppp2ppp/5n2/3p4/3NP3/3P3P/PPP1BKP1/R1BQ1R2 b - - 1 11\nWhat is the compressed FEN row for rank 5?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 5: 3p4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "5", "_rank_lookup_row": "3p4", "diagnostic": true, "hard_gate": false, "rank": "5", "fen_rank_row": "3p4"}} {"example_id": "perception_00025", "split": "perception", "task_type": "square_coordinates", "fen": "2rqkb1r/3n1ppp/p2pb3/1p1Np1Pn/4P3/1N2BP2/PPPQ3P/2KR1B1R w k -", "prompt": "FEN: 2rqkb1r/3n1ppp/p2pb3/1p1Np1Pn/4P3/1N2BP2/PPPQ3P/2KR1B1R w k -\nFor square a1, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "a1: file=a; rank=1; fen_row_from_top=8; file_index=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "a1", "diagnostic": true, "hard_gate": false, "square": "a1"}} {"example_id": "perception_00026", "split": "perception", "task_type": "fen_rank_expansion", "fen": "rnbqkbnr/p1pp2pp/4p3/1p3p2/8/4PN2/PPPPBPPP/RNBQ1RK1 b kq - 1 4", "prompt": "FEN: rnbqkbnr/p1pp2pp/4p3/1p3p2/8/4PN2/PPPPBPPP/RNBQ1RK1 b kq - 1 4\nCompressed rank 3 row: 4PN2\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 3: a=1; b=1; c=1; d=1; e=P; f=N; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "3", "_fen_rank_expansion_row": "4PN2", "diagnostic": true, "hard_gate": false, "rank": "3", "fen_rank_row": "4PN2"}} {"example_id": "perception_00027", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "rnbk3r/ppp1q2p/3p4/5P1Q/2P1B3/3P4/PP5P/R1B1K1Nq w Q - 0 16", "prompt": "Rank 3 row before: 3P4\nFile b changes from 1 to P. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 3: 3P4 -> 1P1P4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "b2b3", "_fen_rank_cell_edit_square": "b3", "_fen_rank_cell_edit_rank": "3", "_fen_rank_cell_edit_file": "b", "_fen_rank_cell_edit_before_row": "3P4", "_fen_rank_cell_edit_after_row": "1P1P4", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "P", "diagnostic": true, "hard_gate": false, "move": "b2b3", "square": "b3", "rank": "3", "file": "b", "before_row": "3P4", "after_row": "1P1P4", "before_fen": "1", "after_fen": "P"}} {"example_id": "perception_00028", "split": "perception", "task_type": "fen_board_edit", "fen": "2rnqr2/2p1n1bk/b2pP1pp/p7/Pp1P1N2/4BN2/1PBQ1PP1/2R1R1K1 b - -", "prompt": "Board FEN before: 2rnqr2/2p1n1bk/b2pP1pp/p7/Pp1P1N2/4BN2/1PBQ1PP1/2R1R1K1\nApply square edits: h7 k->1; h8 1->k\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 2rnqr1k/2p1n1b1/b2pP1pp/p7/Pp1P1N2/4BN2/1PBQ1PP1/2R1R1K1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "h7h8", "_fen_board_edit_board_fen_before": "2rnqr2/2p1n1bk/b2pP1pp/p7/Pp1P1N2/4BN2/1PBQ1PP1/2R1R1K1", "_fen_board_edit_board_fen_after": "2rnqr1k/2p1n1b1/b2pP1pp/p7/Pp1P1N2/4BN2/1PBQ1PP1/2R1R1K1", "_fen_board_edit_edit_text": "h7 k->1; h8 1->k", "_fen_board_edit_changed_squares": [{"square": "h7", "before": "black king", "after": "empty", "before_fen": "k", "after_fen": "1"}, {"square": "h8", "before": "empty", "after": "black king", "before_fen": "1", "after_fen": "k"}], "diagnostic": true, "hard_gate": false, "move": "h7h8", "board_fen_before": "2rnqr2/2p1n1bk/b2pP1pp/p7/Pp1P1N2/4BN2/1PBQ1PP1/2R1R1K1", "board_fen_after": "2rnqr1k/2p1n1b1/b2pP1pp/p7/Pp1P1N2/4BN2/1PBQ1PP1/2R1R1K1", "edit_text": "h7 k->1; h8 1->k", "changed_squares": [{"square": "h7", "before": "black king", "after": "empty", "before_fen": "k", "after_fen": "1"}, {"square": "h8", "before": "empty", "after": "black king", "before_fen": "1", "after_fen": "k"}]}} {"example_id": "perception_00029", "split": "perception", "task_type": "move_square_edits", "fen": "r3kbnr/2qp1ppp/p1b1p3/1p6/3p1N2/P2P1B2/1PP2PPP/R1BQ1RK1 w kq - 3 13", "prompt": "Starting FEN: r3kbnr/2qp1ppp/p1b1p3/1p6/3p1N2/P2P1B2/1PP2PPP/R1BQ1RK1 w kq - 3 13\nMove: f4h3\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: f4=white knight; h3=empty.\nSquares: f4 white knight->empty; h3 empty->white knight.\nRanks: rank 4 f N->1; rank 3 h 1->N.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "f4h3", "diagnostic": true, "hard_gate": false, "move": "f4h3"}} {"example_id": "perception_00030", "split": "perception", "task_type": "fen_assembly", "fen": "r1b1k1nr/pppp1ppp/2n5/b3Pq2/2B5/1Qp2N2/P4PPP/RNB2RK1 w kq -", "prompt": "Starting FEN: r1b1k1nr/pppp1ppp/2n5/b3Pq2/2B5/1Qp2N2/P4PPP/RNB2RK1 w kq - 0 1\nMove: b3b6\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: kq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white queen b3b6.\nLookup: b3=white queen; b6=empty.\nSquares: b3 white queen->empty; b6 empty->white queen.\nRanks: rank 3 b Q->1; rank 6 b 1->Q.\nResult FEN: r1b1k1nr/pppp1ppp/1Qn5/b3Pq2/2B5/2p2N2/P4PPP/RNB2RK1 b kq - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "b3b6", "diagnostic": true, "hard_gate": false, "move": "b3b6"}} {"example_id": "perception_00031", "split": "perception", "task_type": "fen_row_application", "fen": "2kr1bnr/pp3ppp/1qn1p3/4Pb2/2Bp4/2N1BN2/PP3PPP/R2Q1RK1 w - -", "prompt": "Starting FEN: 2kr1bnr/pp3ppp/1qn1p3/4Pb2/2Bp4/2N1BN2/PP3PPP/R2Q1RK1 w - - 0 1\nMove: c3a4\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 3 2N1BN2->4BN2; rank 4 2Bp4->N1Bp4.\nResult FEN: 2kr1bnr/pp3ppp/1qn1p3/4Pb2/N1Bp4/4BN2/PP3PPP/R2Q1RK1 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "c3a4", "_fen_row_application_rank_rewrites": [{"rank": "3", "before": "2N1BN2", "after": "4BN2"}, {"rank": "4", "before": "2Bp4", "after": "N1Bp4"}], "diagnostic": true, "hard_gate": false, "move": "c3a4", "rank_rewrites": [{"rank": "3", "before": "2N1BN2", "after": "4BN2"}, {"rank": "4", "before": "2Bp4", "after": "N1Bp4"}]}} {"example_id": "perception_00032", "split": "perception", "task_type": "state_tracking", "fen": "5b2/5pk1/1n4p1/pN1p2P1/3P4/P4N2/5PK1/8 b - -", "prompt": "Starting FEN: 5b2/5pk1/1n4p1/pN1p2P1/3P4/P4N2/5PK1/8 b - - 0 1\nAfter the moves f8c5, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 8/5pk1/1n4p1/pNbp2P1/3P4/P4N2/5PK1/8 w - - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "f8c5", "_state_tracking_result": "8/5pk1/1n4p1/pNbp2P1/3P4/P4N2/5PK1/8 w - - 1 2"}} {"example_id": "perception_00033", "split": "perception", "task_type": "material_inventory", "fen": "8/3k4/8/4Q3/5K2/8/8/7b w - -", "prompt": "FEN: 8/3k4/8/4Q3/5K2/8/8/7b w - -\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=f4; queen=e5; rook=none; bishop=none; knight=none; pawn=none.\nBlack inventory: king=d7; queen=none; rook=none; bishop=h1; knight=none; pawn=none.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00034", "split": "perception", "task_type": "material_piece_counts", "fen": "4r3/ppRb2pp/3k1p2/8/4PN2/3PP2P/PP4P1/1K6 w - - 9 24", "prompt": "FEN: 4r3/ppRb2pp/3k1p2/8/4PN2/3PP2P/PP4P1/1K6 w - - 9 24\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=1; bishop=0; knight=1; pawn=7.\nBlack counts: king=1; queen=0; rook=1; bishop=1; knight=0; pawn=5.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00035", "split": "perception", "task_type": "material_value_totals", "fen": "1nbqk2r/1pp2ppp/4pn2/1P1p4/1P1P1B2/8/4PPPP/Q3KBNR b Kk -", "prompt": "FEN: 1nbqk2r/1pp2ppp/4pn2/1P1p4/1P1P1B2/8/4PPPP/Q3KBNR b Kk -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=5; bishop=6; knight=3; pawn=7; total=30.\nBlack values: king=0; queen=9; rook=5; bishop=3; knight=6; pawn=7; total=30.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00036", "split": "perception", "task_type": "material_balance_trace", "fen": "8/5b2/5k2/7Q/4K3/8/8/8 w - -", "prompt": "FEN: 8/5b2/5k2/7Q/4K3/8/8/8 w - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=e4; queen=h5; rook=none; bishop=none; knight=none; pawn=none | black king=f6; queen=none; rook=none; bishop=f7; knight=none; pawn=none\nCounts: white king=1; queen=1; rook=0; bishop=0; knight=0; pawn=0 | black king=1; queen=0; rook=0; bishop=1; knight=0; pawn=0\nValues: white total=9; black total=3\nBalance: White is up 6 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00037", "split": "perception", "task_type": "multi_state_tracking", "fen": "4rrk1/ppq3p1/3b1n1p/3p4/3n4/1BP1B2P/PP1Q2P1/R4R1K w - - 0 20", "prompt": "Starting FEN: 4rrk1/ppq3p1/3b1n1p/3p4/3n4/1BP1B2P/PP1Q2P1/R4R1K w - - 0 20\nAfter the moves b3d5 f8f7 h1g1, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 20\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 4r1k1/ppq2rp1/3b1n1p/3B4/3n4/2P1B2P/PP1Q2P1/R4RK1 b - - 2 21", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "b3d5 f8f7 h1g1", "_multi_state_tracking_result": "4r1k1/ppq2rp1/3b1n1p/3B4/3n4/2P1B2P/PP1Q2P1/R4RK1 b - - 2 21", "diagnostic": true, "hard_gate": false, "moves": "b3d5 f8f7 h1g1"}} {"example_id": "perception_00038", "split": "perception", "task_type": "board_print", "fen": "r1bq1rk1/4bpp1/7p/p3P3/1p1pP1n1/1P1P2P1/PB2N1BP/R2Q1RK1 w - - 1 19", "prompt": "Position (FEN): r1bq1rk1/4bpp1/7p/p3P3/1p1pP1n1/1P1P2P1/PB2N1BP/R2Q1RK1 w - - 1 19\nShow me the board.", "gold_answer": "8 r . b q . r k .\n7 . . . . b p p .\n6 . . . . . . . p\n5 p . . . P . . .\n4 . p . p P . n .\n3 . P . P . . P .\n2 P B . . N . B P\n1 R . . Q . R K .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00039", "split": "perception", "task_type": "board_to_fen", "fen": "1nr1k1n1/1p3pp1/2b1P2r/q2pP1N1/1b1P2P1/pPNQ4/P2BB1K1/2R2R2 b - -", "prompt": "Here is the current board:\n8 . n r . k . n .\n7 . p . . . p p .\n6 . . b . P . . r\n5 q . . p P . N .\n4 . b . P . . P .\n3 p P N Q . . . .\n2 P . . B B . K .\n1 . . R . . R . .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "1nr1k1n1/1p3pp1/2b1P2r/q2pP1N1/1b1P2P1/pPNQ4/P2BB1K1/2R2R2 b - - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00040", "split": "perception", "task_type": "piece_id", "fen": "r1b2k1r/pp1p1ppp/5q2/1p6/3p4/2P5/PP3PPP/RN1QR1K1 b - -", "prompt": "FEN: r1b2k1r/pp1p1ppp/5q2/1p6/3p4/2P5/PP3PPP/RN1QR1K1 b - -\nWhat piece is on h7?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "h7"}} {"example_id": "perception_00041", "split": "perception", "task_type": "material_count", "fen": "r3kbnr/6pp/b3pq2/1N1p4/p7/2P5/P1nPQPPP/R1BK2NR b kq - 2 14", "prompt": "FEN: r3kbnr/6pp/b3pq2/1N1p4/p7/2P5/P1nPQPPP/R1BK2NR b kq - 2 14\nWhat is the material count for both sides?", "gold_answer": "White (13 pieces): 1 bishop, 1 king, 2 knights, 6 pawns, 1 queen, 2 rooks. Black (13 pieces): 2 bishops, 1 king, 2 knights, 5 pawns, 1 queen, 2 rooks. Black is up 2 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00042", "split": "perception", "task_type": "square_lookup", "fen": "r2q1rk1/ppb3p1/2ppp2p/4n3/2P1nB2/P1N4P/1P1QBPP1/R3R1K1 w - - 0 17", "prompt": "FEN: r2q1rk1/ppb3p1/2ppp2p/4n3/2P1nB2/P1N4P/1P1QBPP1/R3R1K1 w - - 0 17\nWhat is on e1?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "e1=white rook", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "e1", "diagnostic": true, "hard_gate": false, "square": "e1"}} {"example_id": "perception_00043", "split": "perception", "task_type": "rank_lookup", "fen": "2r1r1k1/1bqp1pbp/pp3np1/4p3/1PPn4/2NP1NP1/Q2BPPBP/1RR3K1 b - -", "prompt": "FEN: 2r1r1k1/1bqp1pbp/pp3np1/4p3/1PPn4/2NP1NP1/Q2BPPBP/1RR3K1 b - -\nWhat is the compressed FEN row for rank 8?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 8: 2r1r1k1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "8", "_rank_lookup_row": "2r1r1k1", "diagnostic": true, "hard_gate": false, "rank": "8", "fen_rank_row": "2r1r1k1"}} {"example_id": "perception_00044", "split": "perception", "task_type": "square_coordinates", "fen": "8/8/6p1/1R6/K5QP/5P2/5k2/8 w - - 8 57", "prompt": "FEN: 8/8/6p1/1R6/K5QP/5P2/5k2/8 w - - 8 57\nFor square d4, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "d4: file=d; rank=4; fen_row_from_top=5; file_index=4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "d4", "diagnostic": true, "hard_gate": false, "square": "d4"}} {"example_id": "perception_00045", "split": "perception", "task_type": "fen_rank_expansion", "fen": "rn2kb1r/pb6/1pp1pq1p/8/3P1n2/3B3Q/PPN2PPP/R1B2RK1 w kq - 0 18", "prompt": "FEN: rn2kb1r/pb6/1pp1pq1p/8/3P1n2/3B3Q/PPN2PPP/R1B2RK1 w kq - 0 18\nCompressed rank 2 row: PPN2PPP\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 2: a=P; b=P; c=N; d=1; e=1; f=P; g=P; h=P", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "2", "_fen_rank_expansion_row": "PPN2PPP", "diagnostic": true, "hard_gate": false, "rank": "2", "fen_rank_row": "PPN2PPP"}} {"example_id": "perception_00046", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r1bq1rk1/pppp1ppp/2n2n2/2b1p3/2B1P3/2PP1N2/PP1N1PPP/R1BQK2R b KQ -", "prompt": "Rank 4 row before: 2B1P3\nFile d changes from 1 to b. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 4: 2B1P3 -> 2BbP3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "c5d4", "_fen_rank_cell_edit_square": "d4", "_fen_rank_cell_edit_rank": "4", "_fen_rank_cell_edit_file": "d", "_fen_rank_cell_edit_before_row": "2B1P3", "_fen_rank_cell_edit_after_row": "2BbP3", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "b", "diagnostic": true, "hard_gate": false, "move": "c5d4", "square": "d4", "rank": "4", "file": "d", "before_row": "2B1P3", "after_row": "2BbP3", "before_fen": "1", "after_fen": "b"}} {"example_id": "perception_00047", "split": "perception", "task_type": "fen_board_edit", "fen": "2k5/ppp2p1p/3b4/8/5pR1/3P4/PPPBr2q/3R1K2 b - - 1 26", "prompt": "Board FEN before: 2k5/ppp2p1p/3b4/8/5pR1/3P4/PPPBr2q/3R1K2\nApply square edits: c7 p->1; c5 1->p\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 2k5/pp3p1p/3b4/2p5/5pR1/3P4/PPPBr2q/3R1K2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "c7c5", "_fen_board_edit_board_fen_before": "2k5/ppp2p1p/3b4/8/5pR1/3P4/PPPBr2q/3R1K2", "_fen_board_edit_board_fen_after": "2k5/pp3p1p/3b4/2p5/5pR1/3P4/PPPBr2q/3R1K2", "_fen_board_edit_edit_text": "c7 p->1; c5 1->p", "_fen_board_edit_changed_squares": [{"square": "c7", "before": "black pawn", "after": "empty", "before_fen": "p", "after_fen": "1"}, {"square": "c5", "before": "empty", "after": "black pawn", "before_fen": "1", "after_fen": "p"}], "diagnostic": true, "hard_gate": false, "move": "c7c5", "board_fen_before": "2k5/ppp2p1p/3b4/8/5pR1/3P4/PPPBr2q/3R1K2", "board_fen_after": "2k5/pp3p1p/3b4/2p5/5pR1/3P4/PPPBr2q/3R1K2", "edit_text": "c7 p->1; c5 1->p", "changed_squares": [{"square": "c7", "before": "black pawn", "after": "empty", "before_fen": "p", "after_fen": "1"}, {"square": "c5", "before": "empty", "after": "black pawn", "before_fen": "1", "after_fen": "p"}]}} {"example_id": "perception_00048", "split": "perception", "task_type": "move_square_edits", "fen": "6k1/p4p1p/b5p1/7q/P3B3/6K1/5PPP/1R6 b - - 4 33", "prompt": "Starting FEN: 6k1/p4p1p/b5p1/7q/P3B3/6K1/5PPP/1R6 b - - 4 33\nMove: a6c4\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: a6=black bishop; c4=empty.\nSquares: a6 black bishop->empty; c4 empty->black bishop.\nRanks: rank 6 a b->1; rank 4 c 1->b.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "a6c4", "diagnostic": true, "hard_gate": false, "move": "a6c4"}} {"example_id": "perception_00049", "split": "perception", "task_type": "fen_assembly", "fen": "r1br2k1/ppq1ppbp/2np1np1/8/4PP2/1NN1B3/PPP1B1PP/R2Q1RK1 w - -", "prompt": "Starting FEN: r1br2k1/ppq1ppbp/2np1np1/8/4PP2/1NN1B3/PPP1B1PP/R2Q1RK1 w - - 0 1\nMove: a2a4\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white pawn a2a4.\nLookup: a2=white pawn; a4=empty.\nSquares: a2 white pawn->empty; a4 empty->white pawn.\nRanks: rank 2 a P->1; rank 4 a 1->P.\nResult FEN: r1br2k1/ppq1ppbp/2np1np1/8/P3PP2/1NN1B3/1PP1B1PP/R2Q1RK1 b - - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "a2a4", "diagnostic": true, "hard_gate": false, "move": "a2a4"}} {"example_id": "perception_00050", "split": "perception", "task_type": "fen_row_application", "fen": "r3r1k1/ppp1qppp/3p4/3P4/3p4/3P4/PPP1QPPP/R4RK1 w - - 0 14", "prompt": "Starting FEN: r3r1k1/ppp1qppp/3p4/3P4/3p4/3P4/PPP1QPPP/R4RK1 w - - 0 14\nMove: e2g4\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 14\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 2 PPP1QPPP->PPP2PPP; rank 4 3p4->3p2Q1.\nResult FEN: r3r1k1/ppp1qppp/3p4/3P4/3p2Q1/3P4/PPP2PPP/R4RK1 b - - 1 14", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "e2g4", "_fen_row_application_rank_rewrites": [{"rank": "2", "before": "PPP1QPPP", "after": "PPP2PPP"}, {"rank": "4", "before": "3p4", "after": "3p2Q1"}], "diagnostic": true, "hard_gate": false, "move": "e2g4", "rank_rewrites": [{"rank": "2", "before": "PPP1QPPP", "after": "PPP2PPP"}, {"rank": "4", "before": "3p4", "after": "3p2Q1"}]}} {"example_id": "perception_00051", "split": "perception", "task_type": "state_tracking", "fen": "8/2R1bp2/1p4k1/4P2p/1p4pP/1P4P1/r5K1/2R5 w - - 0 36", "prompt": "Starting FEN: 8/2R1bp2/1p4k1/4P2p/1p4pP/1P4P1/r5K1/2R5 w - - 0 36\nAfter the moves g2g1, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 36\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 8/2R1bp2/1p4k1/4P2p/1p4pP/1P4P1/r7/2R3K1 b - - 1 36", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "g2g1", "_state_tracking_result": "8/2R1bp2/1p4k1/4P2p/1p4pP/1P4P1/r7/2R3K1 b - - 1 36"}} {"example_id": "perception_00052", "split": "perception", "task_type": "material_inventory", "fen": "r2q1rk1/pbpnbp1p/1p1pp1p1/8/2PP4/2PBPN1P/P1Q2PP1/1RB2RK1 b - - 0 12", "prompt": "FEN: r2q1rk1/pbpnbp1p/1p1pp1p1/8/2PP4/2PBPN1P/P1Q2PP1/1RB2RK1 b - - 0 12\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=c2; rook=b1,f1; bishop=c1,d3; knight=f3; pawn=a2,f2,g2,c3,e3,h3,c4,d4.\nBlack inventory: king=g8; queen=d8; rook=a8,f8; bishop=b7,e7; knight=d7; pawn=b6,d6,e6,g6,a7,c7,f7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00053", "split": "perception", "task_type": "material_piece_counts", "fen": "rnbqk2r/ppp2p2/5n1p/3p2p1/1b1P4/2N1P1B1/PP3PPP/R2QKBNR b KQkq -", "prompt": "FEN: rnbqk2r/ppp2p2/5n1p/3p2p1/1b1P4/2N1P1B1/PP3PPP/R2QKBNR b KQkq -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7.\nBlack counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00054", "split": "perception", "task_type": "material_value_totals", "fen": "r2q1k1r/pp1b2pp/1b2pn2/1P1pQ3/8/2PB4/P4PPP/RNB1K2R w KQ -", "prompt": "FEN: r2q1k1r/pp1b2pp/1b2pn2/1P1pQ3/8/2PB4/P4PPP/RNB1K2R w KQ -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=6; knight=3; pawn=6; total=34.\nBlack values: king=0; queen=9; rook=10; bishop=6; knight=3; pawn=6; total=34.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00055", "split": "perception", "task_type": "material_balance_trace", "fen": "R7/P5k1/6P1/8/8/r3K3/8/8 w - -", "prompt": "FEN: R7/P5k1/6P1/8/8/r3K3/8/8 w - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=e3; queen=none; rook=a8; bishop=none; knight=none; pawn=g6,a7 | black king=g7; queen=none; rook=a3; bishop=none; knight=none; pawn=none\nCounts: white king=1; queen=0; rook=1; bishop=0; knight=0; pawn=2 | black king=1; queen=0; rook=1; bishop=0; knight=0; pawn=0\nValues: white total=7; black total=5\nBalance: White is up 2 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00056", "split": "perception", "task_type": "multi_state_tracking", "fen": "rnbqkb1r/1pp2ppp/5n2/p7/1P1p4/P4N2/1BPP1PPP/RN1QKB1R w KQkq -", "prompt": "Starting FEN: rnbqkb1r/1pp2ppp/5n2/p7/1P1p4/P4N2/1BPP1PPP/RN1QKB1R w KQkq - 0 1\nAfter the moves f3h4 c8g4 c2c4, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rn1qkb1r/1pp2ppp/5n2/p7/1PPp2bN/P7/1B1P1PPP/RN1QKB1R b KQkq c3 0 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "f3h4 c8g4 c2c4", "_multi_state_tracking_result": "rn1qkb1r/1pp2ppp/5n2/p7/1PPp2bN/P7/1B1P1PPP/RN1QKB1R b KQkq c3 0 2", "diagnostic": true, "hard_gate": false, "moves": "f3h4 c8g4 c2c4"}} {"example_id": "perception_00057", "split": "perception", "task_type": "board_print", "fen": "rnb1kb1r/ppppqpp1/5n1p/4p3/2B1P3/1P3N2/PBPP1PPP/RN1QK2R b KQkq - 2 5", "prompt": "Position (FEN): rnb1kb1r/ppppqpp1/5n1p/4p3/2B1P3/1P3N2/PBPP1PPP/RN1QK2R b KQkq - 2 5\nShow me the board.", "gold_answer": "8 r n b . k b . r\n7 p p p p q p p .\n6 . . . . . n . p\n5 . . . . p . . .\n4 . . B . P . . .\n3 . P . . . N . .\n2 P B P P . P P P\n1 R N . Q K . . R\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00058", "split": "perception", "task_type": "board_to_fen", "fen": "2k5/5Q1p/2n2p2/b7/8/6P1/5P1P/6K1 w - -", "prompt": "Here is the current board:\n8 . . k . . . . .\n7 . . . . . Q . p\n6 . . n . . p . .\n5 b . . . . . . .\n4 . . . . . . . .\n3 . . . . . . P .\n2 . . . . . P . P\n1 . . . . . . K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "2k5/5Q1p/2n2p2/b7/8/6P1/5P1P/6K1 w - - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00059", "split": "perception", "task_type": "piece_id", "fen": "r7/8/5ppk/2R1p3/rP3PP1/P3R1K1/8/8 w - -", "prompt": "FEN: r7/8/5ppk/2R1p3/rP3PP1/P3R1K1/8/8 w - -\nWhat piece is on e3?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white rook", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "e3"}} {"example_id": "perception_00060", "split": "perception", "task_type": "material_count", "fen": "1r6/3k2pp/p4n2/8/P1pPP3/5P2/1r3NPP/R4K1R w - -", "prompt": "FEN: 1r6/3k2pp/p4n2/8/P1pPP3/5P2/1r3NPP/R4K1R w - -\nWhat is the material count for both sides?", "gold_answer": "White (10 pieces): 1 king, 1 knight, 6 pawns, 2 rooks. Black (8 pieces): 1 king, 1 knight, 4 pawns, 2 rooks. White is up 2 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00061", "split": "perception", "task_type": "square_lookup", "fen": "r1b2rk1/2p1qpb1/pp1p2np/3P2p1/4P3/2NBB3/PPPQ1RPP/5RK1 b - -", "prompt": "FEN: r1b2rk1/2p1qpb1/pp1p2np/3P2p1/4P3/2NBB3/PPPQ1RPP/5RK1 b - -\nWhat is on g5?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "g5=black pawn", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "g5", "diagnostic": true, "hard_gate": false, "square": "g5"}} {"example_id": "perception_00062", "split": "perception", "task_type": "rank_lookup", "fen": "4Rrk1/p1p3pp/1p6/3r1p2/8/2P4P/PP4P1/R5K1 w - - 4 26", "prompt": "FEN: 4Rrk1/p1p3pp/1p6/3r1p2/8/2P4P/PP4P1/R5K1 w - - 4 26\nWhat is the compressed FEN row for rank 6?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 6: 1p6", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "6", "_rank_lookup_row": "1p6", "diagnostic": true, "hard_gate": false, "rank": "6", "fen_rank_row": "1p6"}} {"example_id": "perception_00063", "split": "perception", "task_type": "square_coordinates", "fen": "r1bqr1k1/ppp1bp1p/2np1npB/4p3/2B1P3/2PP1Q2/PP3PPP/RN2K1NR w KQ - 5 9", "prompt": "FEN: r1bqr1k1/ppp1bp1p/2np1npB/4p3/2B1P3/2PP1Q2/PP3PPP/RN2K1NR w KQ - 5 9\nFor square b7, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "b7: file=b; rank=7; fen_row_from_top=2; file_index=2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "b7", "diagnostic": true, "hard_gate": false, "square": "b7"}} {"example_id": "perception_00064", "split": "perception", "task_type": "fen_rank_expansion", "fen": "3rk1nr/p4ppp/q7/8/1b1Q4/2N5/PP3PPP/R3K2R w KQk - 1 17", "prompt": "FEN: 3rk1nr/p4ppp/q7/8/1b1Q4/2N5/PP3PPP/R3K2R w KQk - 1 17\nCompressed rank 4 row: 1b1Q4\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 4: a=1; b=b; c=1; d=Q; e=1; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "4", "_fen_rank_expansion_row": "1b1Q4", "diagnostic": true, "hard_gate": false, "rank": "4", "fen_rank_row": "1b1Q4"}} {"example_id": "perception_00065", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "rnb1kbnr/pp1p1ppp/2p2q2/4p3/2B1P3/8/PPPPQPPP/RNB1K1NR w KQkq - 2 4", "prompt": "Rank 1 row before: RNB1K1NR\nFile e changes from K to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 1: RNB1K1NR -> RNBK2NR", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "e1d1", "_fen_rank_cell_edit_square": "e1", "_fen_rank_cell_edit_rank": "1", "_fen_rank_cell_edit_file": "e", "_fen_rank_cell_edit_before_row": "RNB1K1NR", "_fen_rank_cell_edit_after_row": "RNBK2NR", "_fen_rank_cell_edit_before_fen": "K", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "e1d1", "square": "e1", "rank": "1", "file": "e", "before_row": "RNB1K1NR", "after_row": "RNBK2NR", "before_fen": "K", "after_fen": "1"}} {"example_id": "perception_00066", "split": "perception", "task_type": "fen_board_edit", "fen": "4rr1k/p5p1/3Q3p/2p5/PpB1b3/4B1PP/2q3P1/R3R1K1 w - -", "prompt": "Board FEN before: 4rr1k/p5p1/3Q3p/2p5/PpB1b3/4B1PP/2q3P1/R3R1K1\nApply square edits: e3 B->1; d2 1->B\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 4rr1k/p5p1/3Q3p/2p5/PpB1b3/6PP/2qB2P1/R3R1K1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "e3d2", "_fen_board_edit_board_fen_before": "4rr1k/p5p1/3Q3p/2p5/PpB1b3/4B1PP/2q3P1/R3R1K1", "_fen_board_edit_board_fen_after": "4rr1k/p5p1/3Q3p/2p5/PpB1b3/6PP/2qB2P1/R3R1K1", "_fen_board_edit_edit_text": "e3 B->1; d2 1->B", "_fen_board_edit_changed_squares": [{"square": "e3", "before": "white bishop", "after": "empty", "before_fen": "B", "after_fen": "1"}, {"square": "d2", "before": "empty", "after": "white bishop", "before_fen": "1", "after_fen": "B"}], "diagnostic": true, "hard_gate": false, "move": "e3d2", "board_fen_before": "4rr1k/p5p1/3Q3p/2p5/PpB1b3/4B1PP/2q3P1/R3R1K1", "board_fen_after": "4rr1k/p5p1/3Q3p/2p5/PpB1b3/6PP/2qB2P1/R3R1K1", "edit_text": "e3 B->1; d2 1->B", "changed_squares": [{"square": "e3", "before": "white bishop", "after": "empty", "before_fen": "B", "after_fen": "1"}, {"square": "d2", "before": "empty", "after": "white bishop", "before_fen": "1", "after_fen": "B"}]}} {"example_id": "perception_00067", "split": "perception", "task_type": "move_square_edits", "fen": "r2qkb1r/pb1n1ppp/1p2pn2/8/3p4/2PB1NN1/PP3PPP/R1BQ1RK1 w kq - 0 11", "prompt": "Starting FEN: r2qkb1r/pb1n1ppp/1p2pn2/8/3p4/2PB1NN1/PP3PPP/R1BQ1RK1 w kq - 0 11\nMove: h2h4\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: h2=white pawn; h4=empty.\nSquares: h2 white pawn->empty; h4 empty->white pawn.\nRanks: rank 2 h P->1; rank 4 h 1->P.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "h2h4", "diagnostic": true, "hard_gate": false, "move": "h2h4"}} {"example_id": "perception_00068", "split": "perception", "task_type": "fen_assembly", "fen": "1q2rrk1/1p2bpp1/pBppnn1p/2P2Q2/NP6/P5P1/4PPBP/R2R2K1 b - - 0 19", "prompt": "Starting FEN: 1q2rrk1/1p2bpp1/pBppnn1p/2P2Q2/NP6/P5P1/4PPBP/R2R2K1 b - - 0 19\nMove: b8a8\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 19\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black queen b8a8.\nLookup: b8=black queen; a8=empty.\nSquares: b8 black queen->empty; a8 empty->black queen.\nRanks: rank 8 b q->1; rank 8 a 1->q.\nResult FEN: q3rrk1/1p2bpp1/pBppnn1p/2P2Q2/NP6/P5P1/4PPBP/R2R2K1 w - - 1 20", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "b8a8", "diagnostic": true, "hard_gate": false, "move": "b8a8"}} {"example_id": "perception_00069", "split": "perception", "task_type": "fen_row_application", "fen": "r1bqkbnr/1p1p2pp/p1n1pp2/2p5/4P3/1PN2N2/PBPP1PPP/R2QKB1R w KQkq - 0 6", "prompt": "Starting FEN: r1bqkbnr/1p1p2pp/p1n1pp2/2p5/4P3/1PN2N2/PBPP1PPP/R2QKB1R w KQkq - 0 6\nMove: f1c4\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 6\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 1 R2QKB1R->R2QK2R; rank 4 4P3->2B1P3.\nResult FEN: r1bqkbnr/1p1p2pp/p1n1pp2/2p5/2B1P3/1PN2N2/PBPP1PPP/R2QK2R b KQkq - 1 6", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "f1c4", "_fen_row_application_rank_rewrites": [{"rank": "1", "before": "R2QKB1R", "after": "R2QK2R"}, {"rank": "4", "before": "4P3", "after": "2B1P3"}], "diagnostic": true, "hard_gate": false, "move": "f1c4", "rank_rewrites": [{"rank": "1", "before": "R2QKB1R", "after": "R2QK2R"}, {"rank": "4", "before": "4P3", "after": "2B1P3"}]}} {"example_id": "perception_00070", "split": "perception", "task_type": "state_tracking", "fen": "r3kbnr/pppb2pp/2n1pq2/3P1p2/2N5/5NP1/PP2PPBP/R1BQ1RK1 b kq - 0 9", "prompt": "Starting FEN: r3kbnr/pppb2pp/2n1pq2/3P1p2/2N5/5NP1/PP2PPBP/R1BQ1RK1 b kq - 0 9\nAfter the moves c6a5, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: kq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 9\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r3kbnr/pppb2pp/4pq2/n2P1p2/2N5/5NP1/PP2PPBP/R1BQ1RK1 w kq - 1 10", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "c6a5", "_state_tracking_result": "r3kbnr/pppb2pp/4pq2/n2P1p2/2N5/5NP1/PP2PPBP/R1BQ1RK1 w kq - 1 10"}} {"example_id": "perception_00071", "split": "perception", "task_type": "material_inventory", "fen": "8/1N4k1/3Q4/8/8/4K3/8/8 w - -", "prompt": "FEN: 8/1N4k1/3Q4/8/8/4K3/8/8 w - -\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=e3; queen=d6; rook=none; bishop=none; knight=b7; pawn=none.\nBlack inventory: king=g7; queen=none; rook=none; bishop=none; knight=none; pawn=none.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00072", "split": "perception", "task_type": "material_piece_counts", "fen": "8/8/8/8/4prkp/8/6RK/4B3 b - - 1 63", "prompt": "FEN: 8/8/8/8/4prkp/8/6RK/4B3 b - - 1 63\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=1; bishop=1; knight=0; pawn=0.\nBlack counts: king=1; queen=0; rook=1; bishop=0; knight=0; pawn=2.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00073", "split": "perception", "task_type": "material_value_totals", "fen": "8/8/pk6/2pK4/PpP5/1P6/8/8 w - -", "prompt": "FEN: 8/8/pk6/2pK4/PpP5/1P6/8/8 w - -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=0; bishop=0; knight=0; pawn=3; total=3.\nBlack values: king=0; queen=0; rook=0; bishop=0; knight=0; pawn=3; total=3.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00074", "split": "perception", "task_type": "material_balance_trace", "fen": "8/6kp/5p2/2n2P2/6KP/8/8/8 b - - 3 46", "prompt": "FEN: 8/6kp/5p2/2n2P2/6KP/8/8/8 b - - 3 46\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g4; queen=none; rook=none; bishop=none; knight=none; pawn=h4,f5 | black king=g7; queen=none; rook=none; bishop=none; knight=c5; pawn=f6,h7\nCounts: white king=1; queen=0; rook=0; bishop=0; knight=0; pawn=2 | black king=1; queen=0; rook=0; bishop=0; knight=1; pawn=2\nValues: white total=2; black total=5\nBalance: Black is up 3 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00075", "split": "perception", "task_type": "multi_state_tracking", "fen": "5r1r/ppqkb1p1/2npp2p/2p5/2N1nB2/2PP4/PP3PPP/R2QK2R w KQ - 0 16", "prompt": "Starting FEN: 5r1r/ppqkb1p1/2npp2p/2p5/2N1nB2/2PP4/PP3PPP/R2QK2R w KQ - 0 16\nAfter the moves e1e2 e6e5 g2g3, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 0\nFullmove number: 16\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 5r1r/ppqkb1p1/2np3p/2p1p3/2N1nB2/2PP2P1/PP2KP1P/R2Q3R b - - 0 17", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "e1e2 e6e5 g2g3", "_multi_state_tracking_result": "5r1r/ppqkb1p1/2np3p/2p1p3/2N1nB2/2PP2P1/PP2KP1P/R2Q3R b - - 0 17", "diagnostic": true, "hard_gate": false, "moves": "e1e2 e6e5 g2g3"}} {"example_id": "perception_00076", "split": "perception", "task_type": "board_print", "fen": "2kr3r/ppp1q1pp/2n2p1n/2B1p3/2B1P3/2P2N1P/PP2Q1P1/R3K2R b KQ - 0 17", "prompt": "Position (FEN): 2kr3r/ppp1q1pp/2n2p1n/2B1p3/2B1P3/2P2N1P/PP2Q1P1/R3K2R b KQ - 0 17\nShow me the board.", "gold_answer": "8 . . k r . . . r\n7 p p p . q . p p\n6 . . n . . p . n\n5 . . B . p . . .\n4 . . B . P . . .\n3 . . P . . N . P\n2 P P . . Q . P .\n1 R . . . K . . R\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00077", "split": "perception", "task_type": "board_to_fen", "fen": "r1bk2nb/ppp4p/q1n1p3/7B/5P2/NPP1B1P1/P6P/3R1RK1 b - - 6 20", "prompt": "Here is the current board:\n8 r . b k . . n b\n7 p p p . . . . p\n6 q . n . p . . .\n5 . . . . . . . B\n4 . . . . . P . .\n3 N P P . B . P .\n2 P . . . . . . P\n1 . . . R . R K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 6\nFullmove number: 20\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r1bk2nb/ppp4p/q1n1p3/7B/5P2/NPP1B1P1/P6P/3R1RK1 b - - 6 20", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00078", "split": "perception", "task_type": "piece_id", "fen": "r3kb1r/pp3ppp/2n5/5b2/2P1n3/4BN2/PP1N1PPP/R2K1B1R b kq -", "prompt": "FEN: r3kb1r/pp3ppp/2n5/5b2/2P1n3/4BN2/PP1N1PPP/R2K1B1R b kq -\nWhat piece is on f2?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "f2"}} {"example_id": "perception_00079", "split": "perception", "task_type": "material_count", "fen": "r6r/1pkn1ppp/p3b3/4p3/6P1/2P1B2P/P1P2PB1/R4RK1 w - -", "prompt": "FEN: r6r/1pkn1ppp/p3b3/4p3/6P1/2P1B2P/P1P2PB1/R4RK1 w - -\nWhat is the material count for both sides?", "gold_answer": "White (11 pieces): 2 bishops, 1 king, 6 pawns, 2 rooks. Black (11 pieces): 1 bishop, 1 king, 1 knight, 6 pawns, 2 rooks. Material is equal.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00080", "split": "perception", "task_type": "square_lookup", "fen": "2kr2nr/pbp2ppp/3q4/4p3/2B5/P7/2QN1PPP/R4RK1 w - - 1 17", "prompt": "FEN: 2kr2nr/pbp2ppp/3q4/4p3/2B5/P7/2QN1PPP/R4RK1 w - - 1 17\nWhat is on e1?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "e1=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "e1", "diagnostic": true, "hard_gate": false, "square": "e1"}} {"example_id": "perception_00081", "split": "perception", "task_type": "rank_lookup", "fen": "2r1r2k/p4ppp/2q5/1ppN1P2/2P5/3P1Q2/Pb4PP/4RRK1 w - - 0 21", "prompt": "FEN: 2r1r2k/p4ppp/2q5/1ppN1P2/2P5/3P1Q2/Pb4PP/4RRK1 w - - 0 21\nWhat is the compressed FEN row for rank 4?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 4: 2P5", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "4", "_rank_lookup_row": "2P5", "diagnostic": true, "hard_gate": false, "rank": "4", "fen_rank_row": "2P5"}} {"example_id": "perception_00082", "split": "perception", "task_type": "square_coordinates", "fen": "r2qk2r/ppp2ppp/2nb1n2/4pb2/4P3/2PP4/PP1BB1PP/RN1QK1NR b KQkq - 0 8", "prompt": "FEN: r2qk2r/ppp2ppp/2nb1n2/4pb2/4P3/2PP4/PP1BB1PP/RN1QK1NR b KQkq - 0 8\nFor square d5, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "d5: file=d; rank=5; fen_row_from_top=4; file_index=4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "d5", "diagnostic": true, "hard_gate": false, "square": "d5"}} {"example_id": "perception_00083", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r1b1kbnr/pppp1pp1/2n4p/8/2BNP2q/8/PPP2PPP/RNBQK2R w KQkq - 1 6", "prompt": "FEN: r1b1kbnr/pppp1pp1/2n4p/8/2BNP2q/8/PPP2PPP/RNBQK2R w KQkq - 1 6\nCompressed rank 7 row: pppp1pp1\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 7: a=p; b=p; c=p; d=p; e=1; f=p; g=p; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "7", "_fen_rank_expansion_row": "pppp1pp1", "diagnostic": true, "hard_gate": false, "rank": "7", "fen_rank_row": "pppp1pp1"}} {"example_id": "perception_00084", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "8/6p1/p5kp/P1p5/2p5/2P5/P1K5/8 b - -", "prompt": "Rank 6 row before: p5kp\nFile g changes from k to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 6: p5kp -> p4k1p", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "g6f6", "_fen_rank_cell_edit_square": "g6", "_fen_rank_cell_edit_rank": "6", "_fen_rank_cell_edit_file": "g", "_fen_rank_cell_edit_before_row": "p5kp", "_fen_rank_cell_edit_after_row": "p4k1p", "_fen_rank_cell_edit_before_fen": "k", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "g6f6", "square": "g6", "rank": "6", "file": "g", "before_row": "p5kp", "after_row": "p4k1p", "before_fen": "k", "after_fen": "1"}} {"example_id": "perception_00085", "split": "perception", "task_type": "fen_board_edit", "fen": "rn2k2r/ppp2pp1/3bbn2/3pp3/4P3/3P2PP/PPP3P1/R1B1KBNR b KQkq - 0 11", "prompt": "Board FEN before: rn2k2r/ppp2pp1/3bbn2/3pp3/4P3/3P2PP/PPP3P1/R1B1KBNR\nApply square edits: b8 n->1; a6 1->n\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: r3k2r/ppp2pp1/n2bbn2/3pp3/4P3/3P2PP/PPP3P1/R1B1KBNR", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "b8a6", "_fen_board_edit_board_fen_before": "rn2k2r/ppp2pp1/3bbn2/3pp3/4P3/3P2PP/PPP3P1/R1B1KBNR", "_fen_board_edit_board_fen_after": "r3k2r/ppp2pp1/n2bbn2/3pp3/4P3/3P2PP/PPP3P1/R1B1KBNR", "_fen_board_edit_edit_text": "b8 n->1; a6 1->n", "_fen_board_edit_changed_squares": [{"square": "b8", "before": "black knight", "after": "empty", "before_fen": "n", "after_fen": "1"}, {"square": "a6", "before": "empty", "after": "black knight", "before_fen": "1", "after_fen": "n"}], "diagnostic": true, "hard_gate": false, "move": "b8a6", "board_fen_before": "rn2k2r/ppp2pp1/3bbn2/3pp3/4P3/3P2PP/PPP3P1/R1B1KBNR", "board_fen_after": "r3k2r/ppp2pp1/n2bbn2/3pp3/4P3/3P2PP/PPP3P1/R1B1KBNR", "edit_text": "b8 n->1; a6 1->n", "changed_squares": [{"square": "b8", "before": "black knight", "after": "empty", "before_fen": "n", "after_fen": "1"}, {"square": "a6", "before": "empty", "after": "black knight", "before_fen": "1", "after_fen": "n"}]}} {"example_id": "perception_00086", "split": "perception", "task_type": "move_square_edits", "fen": "2k4r/pppr2pp/8/2b2pN1/2Bp1n2/5P2/PPP2P1P/1K1RR3 w - - 4 17", "prompt": "Starting FEN: 2k4r/pppr2pp/8/2b2pN1/2Bp1n2/5P2/PPP2P1P/1K1RR3 w - - 4 17\nMove: b2b4\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: b2=white pawn; b4=empty.\nSquares: b2 white pawn->empty; b4 empty->white pawn.\nRanks: rank 2 b P->1; rank 4 b 1->P.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "b2b4", "diagnostic": true, "hard_gate": false, "move": "b2b4"}} {"example_id": "perception_00087", "split": "perception", "task_type": "fen_assembly", "fen": "3r4/b1B4p/8/5k2/8/5B2/6KP/8 b - -", "prompt": "Starting FEN: 3r4/b1B4p/8/5k2/8/5B2/6KP/8 b - - 0 1\nMove: f5f6\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black king f5f6.\nLookup: f5=black king; f6=empty.\nSquares: f5 black king->empty; f6 empty->black king.\nRanks: rank 5 f k->1; rank 6 f 1->k.\nResult FEN: 3r4/b1B4p/5k2/8/8/5B2/6KP/8 w - - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "f5f6", "diagnostic": true, "hard_gate": false, "move": "f5f6"}} {"example_id": "perception_00088", "split": "perception", "task_type": "fen_row_application", "fen": "3r4/p1N1k1p1/7p/2B5/2p5/2N5/PPn2PPP/3R2K1 b - - 0 23", "prompt": "Starting FEN: 3r4/p1N1k1p1/7p/2B5/2p5/2N5/PPn2PPP/3R2K1 b - - 0 23\nMove: e7f6\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 23\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 7 p1N1k1p1->p1N3p1; rank 6 7p->5k1p.\nResult FEN: 3r4/p1N3p1/5k1p/2B5/2p5/2N5/PPn2PPP/3R2K1 w - - 1 24", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "e7f6", "_fen_row_application_rank_rewrites": [{"rank": "7", "before": "p1N1k1p1", "after": "p1N3p1"}, {"rank": "6", "before": "7p", "after": "5k1p"}], "diagnostic": true, "hard_gate": false, "move": "e7f6", "rank_rewrites": [{"rank": "7", "before": "p1N1k1p1", "after": "p1N3p1"}, {"rank": "6", "before": "7p", "after": "5k1p"}]}} {"example_id": "perception_00089", "split": "perception", "task_type": "state_tracking", "fen": "1r2k1nr/pb1p2pp/1pnb4/2p2p2/3P1P2/1P4P1/P1PQPNBP/q1B2K1R b k - 1 13", "prompt": "Starting FEN: 1r2k1nr/pb1p2pp/1pnb4/2p2p2/3P1P2/1P4P1/P1PQPNBP/q1B2K1R b k - 1 13\nAfter the moves h7h6, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: k\nEn passant: none\nHalfmove clock: 1\nFullmove number: 13\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 1r2k1nr/pb1p2p1/1pnb3p/2p2p2/3P1P2/1P4P1/P1PQPNBP/q1B2K1R w k - 0 14", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "h7h6", "_state_tracking_result": "1r2k1nr/pb1p2p1/1pnb3p/2p2p2/3P1P2/1P4P1/P1PQPNBP/q1B2K1R w k - 0 14"}} {"example_id": "perception_00090", "split": "perception", "task_type": "material_inventory", "fen": "2q3k1/2bn1pp1/5n1p/Bp1p4/3Pp3/1N2P2P/5PP1/Q1N3K1 w - - 1 28", "prompt": "FEN: 2q3k1/2bn1pp1/5n1p/Bp1p4/3Pp3/1N2P2P/5PP1/Q1N3K1 w - - 1 28\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=a1; rook=none; bishop=a5; knight=c1,b3; pawn=f2,g2,e3,h3,d4.\nBlack inventory: king=g8; queen=c8; rook=none; bishop=c7; knight=f6,d7; pawn=e4,b5,d5,h6,f7,g7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00091", "split": "perception", "task_type": "material_piece_counts", "fen": "5r1k/3Q2pp/3p2n1/1p1P2N1/8/1B2P2P/PP4PK/4q3 b - - 0 26", "prompt": "FEN: 5r1k/3Q2pp/3p2n1/1p1P2N1/8/1B2P2P/PP4PK/4q3 b - - 0 26\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=0; bishop=1; knight=1; pawn=6.\nBlack counts: king=1; queen=1; rook=1; bishop=0; knight=1; pawn=4.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00092", "split": "perception", "task_type": "material_value_totals", "fen": "2r1k1nr/pp2bpp1/1q2p3/4P1BP/1n1p1P1P/2N2Q2/PPP3B1/2KR3R w k -", "prompt": "FEN: 2r1k1nr/pp2bpp1/1q2p3/4P1BP/1n1p1P1P/2N2Q2/PPP3B1/2KR3R w k -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=6; knight=3; pawn=7; total=35.\nBlack values: king=0; queen=9; rook=10; bishop=3; knight=6; pawn=6; total=34.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00093", "split": "perception", "task_type": "material_balance_trace", "fen": "r2q1rk1/1p4pp/p1npb2n/4pp2/2P1P3/2NQ4/PPN1BPPP/3R1RK1 b - -", "prompt": "FEN: r2q1rk1/1p4pp/p1npb2n/4pp2/2P1P3/2NQ4/PPN1BPPP/3R1RK1 b - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=d3; rook=d1,f1; bishop=e2; knight=c2,c3; pawn=a2,b2,f2,g2,h2,c4,e4 | black king=g8; queen=d8; rook=a8,f8; bishop=e6; knight=c6,h6; pawn=e5,f5,a6,d6,b7,g7,h7\nCounts: white king=1; queen=1; rook=2; bishop=1; knight=2; pawn=7 | black king=1; queen=1; rook=2; bishop=1; knight=2; pawn=7\nValues: white total=35; black total=35\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00094", "split": "perception", "task_type": "multi_state_tracking", "fen": "3r2k1/p5p1/1bprp1Np/5p2/1n6/1K3B2/6PP/2BR1R2 b - - 1 33", "prompt": "Starting FEN: 3r2k1/p5p1/1bprp1Np/5p2/1n6/1K3B2/6PP/2BR1R2 b - - 1 33\nAfter the moves c6c5 f3h5 d6d7, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 33\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 3r2k1/p2r2p1/1b2p1Np/2p2p1B/1n6/1K6/6PP/2BR1R2 w - - 2 35", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "c6c5 f3h5 d6d7", "_multi_state_tracking_result": "3r2k1/p2r2p1/1b2p1Np/2p2p1B/1n6/1K6/6PP/2BR1R2 w - - 2 35", "diagnostic": true, "hard_gate": false, "moves": "c6c5 f3h5 d6d7"}} {"example_id": "perception_00095", "split": "perception", "task_type": "board_print", "fen": "6k1/6p1/2N4p/8/5pR1/7P/r4rPK/8 b - - 1 37", "prompt": "Position (FEN): 6k1/6p1/2N4p/8/5pR1/7P/r4rPK/8 b - - 1 37\nShow me the board.", "gold_answer": "8 . . . . . . k .\n7 . . . . . . p .\n6 . . N . . . . p\n5 . . . . . . . .\n4 . . . . . p R .\n3 . . . . . . . P\n2 r . . . . r P K\n1 . . . . . . . .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00096", "split": "perception", "task_type": "board_to_fen", "fen": "r1bq3r/2ppbkpp/p7/1pn1R3/8/8/PPPP1PPP/RNBQ2K1 w - -", "prompt": "Here is the current board:\n8 r . b q . . . r\n7 . . p p b k p p\n6 p . . . . . . .\n5 . p n . R . . .\n4 . . . . . . . .\n3 . . . . . . . .\n2 P P P P . P P P\n1 R N B Q . . K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r1bq3r/2ppbkpp/p7/1pn1R3/8/8/PPPP1PPP/RNBQ2K1 w - - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00097", "split": "perception", "task_type": "piece_id", "fen": "8/3k2pR/2p5/2PnP3/r1NK4/8/8/8 b - -", "prompt": "FEN: 8/3k2pR/2p5/2PnP3/r1NK4/8/8/8 b - -\nWhat piece is on d4?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white king", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "d4"}} {"example_id": "perception_00098", "split": "perception", "task_type": "material_count", "fen": "rnr3k1/1R3pp1/p2ppq1p/2b5/2P5/1N2B1P1/P1P2PKP/3Q1R2 b - -", "prompt": "FEN: rnr3k1/1R3pp1/p2ppq1p/2b5/2P5/1N2B1P1/P1P2PKP/3Q1R2 b - -\nWhat is the material count for both sides?", "gold_answer": "White (12 pieces): 1 bishop, 1 king, 1 knight, 6 pawns, 1 queen, 2 rooks. Black (12 pieces): 1 bishop, 1 king, 1 knight, 6 pawns, 1 queen, 2 rooks. Material is equal.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00099", "split": "perception", "task_type": "square_lookup", "fen": "r1bqkb1r/ppp2ppp/2n2n2/8/3N4/8/PPP2PPP/R1BQKBNR w KQkq - 1 9", "prompt": "FEN: r1bqkb1r/ppp2ppp/2n2n2/8/3N4/8/PPP2PPP/R1BQKBNR w KQkq - 1 9\nWhat is on b7?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "b7=black pawn", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "b7", "diagnostic": true, "hard_gate": false, "square": "b7"}} {"example_id": "perception_00100", "split": "perception", "task_type": "rank_lookup", "fen": "8/5ppk/6n1/1R4Pp/2p3b1/p7/PbB1N1P1/5K2 b - -", "prompt": "FEN: 8/5ppk/6n1/1R4Pp/2p3b1/p7/PbB1N1P1/5K2 b - -\nWhat is the compressed FEN row for rank 5?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 5: 1R4Pp", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "5", "_rank_lookup_row": "1R4Pp", "diagnostic": true, "hard_gate": false, "rank": "5", "fen_rank_row": "1R4Pp"}} {"example_id": "perception_00101", "split": "perception", "task_type": "square_coordinates", "fen": "8/p1p5/8/5p1p/6k1/1P6/2K3RP/4N3 b - - 2 35", "prompt": "FEN: 8/p1p5/8/5p1p/6k1/1P6/2K3RP/4N3 b - - 2 35\nFor square b5, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "b5: file=b; rank=5; fen_row_from_top=4; file_index=2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "b5", "diagnostic": true, "hard_gate": false, "square": "b5"}} {"example_id": "perception_00102", "split": "perception", "task_type": "fen_rank_expansion", "fen": "rnb1k2r/pp1pppbp/5np1/2q5/2P5/4PN2/PP1B1PPP/RN1QKB1R w KQkq -", "prompt": "FEN: rnb1k2r/pp1pppbp/5np1/2q5/2P5/4PN2/PP1B1PPP/RN1QKB1R w KQkq -\nCompressed rank 7 row: pp1pppbp\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 7: a=p; b=p; c=1; d=p; e=p; f=p; g=b; h=p", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "7", "_fen_rank_expansion_row": "pp1pppbp", "diagnostic": true, "hard_gate": false, "rank": "7", "fen_rank_row": "pp1pppbp"}} {"example_id": "perception_00103", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "8/5p2/4k3/PbKp2pp/8/8/8/8 w - - 0 49", "prompt": "Rank 5 row before: PbKp2pp\nFile c changes from K to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 5: PbKp2pp -> Pb1p2pp", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "c5d4", "_fen_rank_cell_edit_square": "c5", "_fen_rank_cell_edit_rank": "5", "_fen_rank_cell_edit_file": "c", "_fen_rank_cell_edit_before_row": "PbKp2pp", "_fen_rank_cell_edit_after_row": "Pb1p2pp", "_fen_rank_cell_edit_before_fen": "K", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "c5d4", "square": "c5", "rank": "5", "file": "c", "before_row": "PbKp2pp", "after_row": "Pb1p2pp", "before_fen": "K", "after_fen": "1"}} {"example_id": "perception_00104", "split": "perception", "task_type": "fen_board_edit", "fen": "8/pK6/P2p4/8/3k4/2p5/2P5/8 b - -", "prompt": "Board FEN before: 8/pK6/P2p4/8/3k4/2p5/2P5/8\nApply square edits: d4 k->1; d5 1->k\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 8/pK6/P2p4/3k4/8/2p5/2P5/8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "d4d5", "_fen_board_edit_board_fen_before": "8/pK6/P2p4/8/3k4/2p5/2P5/8", "_fen_board_edit_board_fen_after": "8/pK6/P2p4/3k4/8/2p5/2P5/8", "_fen_board_edit_edit_text": "d4 k->1; d5 1->k", "_fen_board_edit_changed_squares": [{"square": "d4", "before": "black king", "after": "empty", "before_fen": "k", "after_fen": "1"}, {"square": "d5", "before": "empty", "after": "black king", "before_fen": "1", "after_fen": "k"}], "diagnostic": true, "hard_gate": false, "move": "d4d5", "board_fen_before": "8/pK6/P2p4/8/3k4/2p5/2P5/8", "board_fen_after": "8/pK6/P2p4/3k4/8/2p5/2P5/8", "edit_text": "d4 k->1; d5 1->k", "changed_squares": [{"square": "d4", "before": "black king", "after": "empty", "before_fen": "k", "after_fen": "1"}, {"square": "d5", "before": "empty", "after": "black king", "before_fen": "1", "after_fen": "k"}]}} {"example_id": "perception_00105", "split": "perception", "task_type": "move_square_edits", "fen": "r3r1k1/1b1n3p/pp2pqp1/2pP1p2/2P5/1P1B1N1P/PQ3PP1/R2R2K1 w - -", "prompt": "Starting FEN: r3r1k1/1b1n3p/pp2pqp1/2pP1p2/2P5/1P1B1N1P/PQ3PP1/R2R2K1 w - -\nMove: a1b1\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: a1=white rook; b1=empty.\nSquares: a1 white rook->empty; b1 empty->white rook.\nRanks: rank 1 a R->1; rank 1 b 1->R.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "a1b1", "diagnostic": true, "hard_gate": false, "move": "a1b1"}} {"example_id": "perception_00106", "split": "perception", "task_type": "fen_assembly", "fen": "r5k1/1p2q2p/1P1p2pB/1QpPpP2/8/7P/5PP1/1R4K1 b - - 0 29", "prompt": "Starting FEN: r5k1/1p2q2p/1P1p2pB/1QpPpP2/8/7P/5PP1/1R4K1 b - - 0 29\nMove: e7e8\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 29\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black queen e7e8.\nLookup: e7=black queen; e8=empty.\nSquares: e7 black queen->empty; e8 empty->black queen.\nRanks: rank 7 e q->1; rank 8 e 1->q.\nResult FEN: r3q1k1/1p5p/1P1p2pB/1QpPpP2/8/7P/5PP1/1R4K1 w - - 1 30", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "e7e8", "diagnostic": true, "hard_gate": false, "move": "e7e8"}} {"example_id": "perception_00107", "split": "perception", "task_type": "fen_row_application", "fen": "4r2k/p1n3p1/6pp/8/2QP1Pq1/2P3P1/P2B3P/1R4K1 b - -", "prompt": "Starting FEN: 4r2k/p1n3p1/6pp/8/2QP1Pq1/2P3P1/P2B3P/1R4K1 b - - 0 1\nMove: e8b8\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 8 4r2k->1r5k.\nResult FEN: 1r5k/p1n3p1/6pp/8/2QP1Pq1/2P3P1/P2B3P/1R4K1 w - - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "e8b8", "_fen_row_application_rank_rewrites": [{"rank": "8", "before": "4r2k", "after": "1r5k"}], "diagnostic": true, "hard_gate": false, "move": "e8b8", "rank_rewrites": [{"rank": "8", "before": "4r2k", "after": "1r5k"}]}} {"example_id": "perception_00108", "split": "perception", "task_type": "state_tracking", "fen": "rnbq1rk1/pp2ppbp/5np1/2p5/4p3/3P1NP1/PPPN1PBP/R1BQ1RK1 w - -", "prompt": "Starting FEN: rnbq1rk1/pp2ppbp/5np1/2p5/4p3/3P1NP1/PPPN1PBP/R1BQ1RK1 w - - 0 1\nAfter the moves f3d4, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rnbq1rk1/pp2ppbp/5np1/2p5/3Np3/3P2P1/PPPN1PBP/R1BQ1RK1 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "f3d4", "_state_tracking_result": "rnbq1rk1/pp2ppbp/5np1/2p5/3Np3/3P2P1/PPPN1PBP/R1BQ1RK1 b - - 1 1"}} {"example_id": "perception_00109", "split": "perception", "task_type": "material_inventory", "fen": "1r1r4/p4k2/3b2p1/5p2/2P1p3/2Bn4/P1KP4/5RR1 b - - 1 34", "prompt": "FEN: 1r1r4/p4k2/3b2p1/5p2/2P1p3/2Bn4/P1KP4/5RR1 b - - 1 34\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=c2; queen=none; rook=f1,g1; bishop=c3; knight=none; pawn=a2,d2,c4.\nBlack inventory: king=f7; queen=none; rook=b8,d8; bishop=d6; knight=d3; pawn=e4,f5,g6,a7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00110", "split": "perception", "task_type": "material_piece_counts", "fen": "8/p4kpp/2p1p3/1p6/2B5/8/PP3PPP/3K4 w - - 0 22", "prompt": "FEN: 8/p4kpp/2p1p3/1p6/2B5/8/PP3PPP/3K4 w - - 0 22\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=0; bishop=1; knight=0; pawn=5.\nBlack counts: king=1; queen=0; rook=0; bishop=0; knight=0; pawn=6.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00111", "split": "perception", "task_type": "material_value_totals", "fen": "r5nr/pp2kQpp/1q2pp2/1b1pN3/3p4/PP1P4/3N1PPP/R3K2R b KQ -", "prompt": "FEN: r5nr/pp2kQpp/1q2pp2/1b1pN3/3p4/PP1P4/3N1PPP/R3K2R b KQ -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=0; knight=6; pawn=6; total=31.\nBlack values: king=0; queen=9; rook=10; bishop=3; knight=3; pawn=8; total=33.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00112", "split": "perception", "task_type": "material_balance_trace", "fen": "rn5r/pp3k2/2pPn3/7p/3P4/8/PPP2PPP/2KR3R b - - 1 20", "prompt": "FEN: rn5r/pp3k2/2pPn3/7p/3P4/8/PPP2PPP/2KR3R b - - 1 20\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=c1; queen=none; rook=d1,h1; bishop=none; knight=none; pawn=a2,b2,c2,f2,g2,h2,d4,d6 | black king=f7; queen=none; rook=a8,h8; bishop=none; knight=e6,b8; pawn=h5,c6,a7,b7\nCounts: white king=1; queen=0; rook=2; bishop=0; knight=0; pawn=8 | black king=1; queen=0; rook=2; bishop=0; knight=2; pawn=4\nValues: white total=18; black total=20\nBalance: Black is up 2 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00113", "split": "perception", "task_type": "multi_state_tracking", "fen": "r4rk1/pbqnppbp/3p2p1/1B6/1P1PP3/B1P2QNP/5PP1/R4RK1 w - - 3 17", "prompt": "Starting FEN: r4rk1/pbqnppbp/3p2p1/1B6/1P1PP3/B1P2QNP/5PP1/R4RK1 w - - 3 17\nAfter the moves g3h1 c7c3, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 3\nFullmove number: 17\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r4rk1/pb1nppbp/3p2p1/1B6/1P1PP3/B1q2Q1P/5PP1/R4RKN w - - 0 18", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "g3h1 c7c3", "_multi_state_tracking_result": "r4rk1/pb1nppbp/3p2p1/1B6/1P1PP3/B1q2Q1P/5PP1/R4RKN w - - 0 18", "diagnostic": true, "hard_gate": false, "moves": "g3h1 c7c3"}} {"example_id": "perception_00114", "split": "perception", "task_type": "board_print", "fen": "4r3/1kq2p2/4r1p1/3PPb1p/p1p4P/PpP3KP/1P2R3/4R3 b - - 0 45", "prompt": "Position (FEN): 4r3/1kq2p2/4r1p1/3PPb1p/p1p4P/PpP3KP/1P2R3/4R3 b - - 0 45\nShow me the board.", "gold_answer": "8 . . . . r . . .\n7 . k q . . p . .\n6 . . . . r . p .\n5 . . . P P b . p\n4 p . p . . . . P\n3 P p P . . . K P\n2 . P . . R . . .\n1 . . . . R . . .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00115", "split": "perception", "task_type": "board_to_fen", "fen": "r4k1r/ppp2ppp/8/2bnQ3/2B4q/2PP1P2/PP5P/RNB1K2R w KQ -", "prompt": "Here is the current board:\n8 r . . . . k . r\n7 p p p . . p p p\n6 . . . . . . . .\n5 . . b n Q . . .\n4 . . B . . . . q\n3 . . P P . P . .\n2 P P . . . . . P\n1 R N B . K . . R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r4k1r/ppp2ppp/8/2bnQ3/2B4q/2PP1P2/PP5P/RNB1K2R w KQ - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00116", "split": "perception", "task_type": "piece_id", "fen": "r1b1k1nr/ppp2ppp/2n5/3qp3/1b1P4/2N1PN2/PP3PPP/R1BQKB1R b KQkq - 0 6", "prompt": "FEN: r1b1k1nr/ppp2ppp/2n5/3qp3/1b1P4/2N1PN2/PP3PPP/R1BQKB1R b KQkq - 0 6\nWhat piece is on a7?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "a7"}} {"example_id": "perception_00117", "split": "perception", "task_type": "material_count", "fen": "4k2r/6R1/5p2/4p3/b3N2p/q4N1P/P2K4/2R5 b k - 3 35", "prompt": "FEN: 4k2r/6R1/5p2/4p3/b3N2p/q4N1P/P2K4/2R5 b k - 3 35\nWhat is the material count for both sides?", "gold_answer": "White (7 pieces): 1 king, 2 knights, 2 pawns, 2 rooks. Black (7 pieces): 1 bishop, 1 king, 3 pawns, 1 queen, 1 rook. Black is up 2 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00118", "split": "perception", "task_type": "square_lookup", "fen": "8/8/4R3/8/1k1K4/8/8/8 w - -", "prompt": "FEN: 8/8/4R3/8/1k1K4/8/8/8 w - -\nWhat is on d4?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "d4=white king", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "d4", "diagnostic": true, "hard_gate": false, "square": "d4"}} {"example_id": "perception_00119", "split": "perception", "task_type": "rank_lookup", "fen": "r1bqkb1r/pp1npppp/2Bp4/4P3/3Q4/5N2/PPP2PPP/RNB1K2R b KQkq -", "prompt": "FEN: r1bqkb1r/pp1npppp/2Bp4/4P3/3Q4/5N2/PPP2PPP/RNB1K2R b KQkq -\nWhat is the compressed FEN row for rank 8?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 8: r1bqkb1r", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "8", "_rank_lookup_row": "r1bqkb1r", "diagnostic": true, "hard_gate": false, "rank": "8", "fen_rank_row": "r1bqkb1r"}} {"example_id": "perception_00120", "split": "perception", "task_type": "square_coordinates", "fen": "r3kbnr/pp2pp1p/2n3p1/1Bpq4/6b1/2P2N2/PP1P1PPP/RNBQ1RK1 w kq -", "prompt": "FEN: r3kbnr/pp2pp1p/2n3p1/1Bpq4/6b1/2P2N2/PP1P1PPP/RNBQ1RK1 w kq -\nFor square e1, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "e1: file=e; rank=1; fen_row_from_top=8; file_index=5", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "e1", "diagnostic": true, "hard_gate": false, "square": "e1"}} {"example_id": "perception_00121", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r4r1k/5pp1/p7/1p6/1P1nBPq1/P6R/6PP/R5K1 b - - 1 27", "prompt": "FEN: r4r1k/5pp1/p7/1p6/1P1nBPq1/P6R/6PP/R5K1 b - - 1 27\nCompressed rank 2 row: 6PP\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 2: a=1; b=1; c=1; d=1; e=1; f=1; g=P; h=P", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "2", "_fen_rank_expansion_row": "6PP", "diagnostic": true, "hard_gate": false, "rank": "2", "fen_rank_row": "6PP"}} {"example_id": "perception_00122", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "4r1k1/1p3p1p/p4qp1/8/8/3B3P/PPQ2PP1/1R4K1 w - - 0 23", "prompt": "Rank 4 row before: 8\nFile f changes from 1 to P. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 4: 8 -> 5P2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "f2f4", "_fen_rank_cell_edit_square": "f4", "_fen_rank_cell_edit_rank": "4", "_fen_rank_cell_edit_file": "f", "_fen_rank_cell_edit_before_row": "8", "_fen_rank_cell_edit_after_row": "5P2", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "P", "diagnostic": true, "hard_gate": false, "move": "f2f4", "square": "f4", "rank": "4", "file": "f", "before_row": "8", "after_row": "5P2", "before_fen": "1", "after_fen": "P"}} {"example_id": "perception_00123", "split": "perception", "task_type": "fen_board_edit", "fen": "4R3/2B2k2/p6p/1p6/8/5P1P/6PK/8 b - -", "prompt": "Board FEN before: 4R3/2B2k2/p6p/1p6/8/5P1P/6PK/8\nApply square edits: b5 p->1; b4 1->p\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 4R3/2B2k2/p6p/8/1p6/5P1P/6PK/8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "b5b4", "_fen_board_edit_board_fen_before": "4R3/2B2k2/p6p/1p6/8/5P1P/6PK/8", "_fen_board_edit_board_fen_after": "4R3/2B2k2/p6p/8/1p6/5P1P/6PK/8", "_fen_board_edit_edit_text": "b5 p->1; b4 1->p", "_fen_board_edit_changed_squares": [{"square": "b5", "before": "black pawn", "after": "empty", "before_fen": "p", "after_fen": "1"}, {"square": "b4", "before": "empty", "after": "black pawn", "before_fen": "1", "after_fen": "p"}], "diagnostic": true, "hard_gate": false, "move": "b5b4", "board_fen_before": "4R3/2B2k2/p6p/1p6/8/5P1P/6PK/8", "board_fen_after": "4R3/2B2k2/p6p/8/1p6/5P1P/6PK/8", "edit_text": "b5 p->1; b4 1->p", "changed_squares": [{"square": "b5", "before": "black pawn", "after": "empty", "before_fen": "p", "after_fen": "1"}, {"square": "b4", "before": "empty", "after": "black pawn", "before_fen": "1", "after_fen": "p"}]}} {"example_id": "perception_00124", "split": "perception", "task_type": "move_square_edits", "fen": "3r1r2/pppk4/2nqpbQR/3p2p1/3P4/P1P1B3/2P1PPB1/R3K3 w Q - 3 21", "prompt": "Starting FEN: 3r1r2/pppk4/2nqpbQR/3p2p1/3P4/P1P1B3/2P1PPB1/R3K3 w Q - 3 21\nMove: e3c1\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: e3=white bishop; c1=empty.\nSquares: e3 white bishop->empty; c1 empty->white bishop.\nRanks: rank 3 e B->1; rank 1 c 1->B.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "e3c1", "diagnostic": true, "hard_gate": false, "move": "e3c1"}} {"example_id": "perception_00125", "split": "perception", "task_type": "fen_assembly", "fen": "8/8/2k5/8/p6R/4P3/P2B1PP1/R3KBN1 w Q -", "prompt": "Starting FEN: 8/8/2k5/8/p6R/4P3/P2B1PP1/R3KBN1 w Q - 0 1\nMove: h4d4\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: Q\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white rook h4d4.\nLookup: h4=white rook; d4=empty.\nSquares: h4 white rook->empty; d4 empty->white rook.\nRanks: rank 4 h R->1; rank 4 d 1->R.\nResult FEN: 8/8/2k5/8/p2R4/4P3/P2B1PP1/R3KBN1 b Q - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "h4d4", "diagnostic": true, "hard_gate": false, "move": "h4d4"}} {"example_id": "perception_00126", "split": "perception", "task_type": "fen_row_application", "fen": "5R2/8/3k4/8/8/4K3/8/7R w - -", "prompt": "Starting FEN: 5R2/8/3k4/8/8/4K3/8/7R w - - 0 1\nMove: e3d3\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 3 4K3->3K4.\nResult FEN: 5R2/8/3k4/8/8/3K4/8/7R b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "e3d3", "_fen_row_application_rank_rewrites": [{"rank": "3", "before": "4K3", "after": "3K4"}], "diagnostic": true, "hard_gate": false, "move": "e3d3", "rank_rewrites": [{"rank": "3", "before": "4K3", "after": "3K4"}]}} {"example_id": "perception_00127", "split": "perception", "task_type": "state_tracking", "fen": "4r1k1/5p2/1pn3p1/1Bp3Bq/6p1/8/Pb3PPP/2QR2K1 w - -", "prompt": "Starting FEN: 4r1k1/5p2/1pn3p1/1Bp3Bq/6p1/8/Pb3PPP/2QR2K1 w - - 0 1\nAfter the moves b5c4, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 4r1k1/5p2/1pn3p1/2p3Bq/2B3p1/8/Pb3PPP/2QR2K1 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "b5c4", "_state_tracking_result": "4r1k1/5p2/1pn3p1/2p3Bq/2B3p1/8/Pb3PPP/2QR2K1 b - - 1 1"}} {"example_id": "perception_00128", "split": "perception", "task_type": "material_inventory", "fen": "rn1qkb1r/pp3ppp/2p1b3/1B6/3P4/4pN2/PPP3PP/RN1Q1RK1 w kq -", "prompt": "FEN: rn1qkb1r/pp3ppp/2p1b3/1B6/3P4/4pN2/PPP3PP/RN1Q1RK1 w kq -\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=d1; rook=a1,f1; bishop=b5; knight=b1,f3; pawn=a2,b2,c2,g2,h2,d4.\nBlack inventory: king=e8; queen=d8; rook=a8,h8; bishop=e6,f8; knight=b8; pawn=e3,c6,a7,b7,f7,g7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00129", "split": "perception", "task_type": "material_piece_counts", "fen": "k2r1r2/P1R5/3Q3p/1q1P2p1/P7/3p1P1b/5P1P/7K w - - 0 28", "prompt": "FEN: k2r1r2/P1R5/3Q3p/1q1P2p1/P7/3p1P1b/5P1P/7K w - - 0 28\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=1; bishop=0; knight=0; pawn=6.\nBlack counts: king=1; queen=1; rook=2; bishop=1; knight=0; pawn=3.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00130", "split": "perception", "task_type": "material_value_totals", "fen": "5k2/R5pp/7n/8/1P1p1P2/5K1P/3r4/8 b - - 0 38", "prompt": "FEN: 5k2/R5pp/7n/8/1P1p1P2/5K1P/3r4/8 b - - 0 38\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=5; bishop=0; knight=0; pawn=3; total=8.\nBlack values: king=0; queen=0; rook=5; bishop=0; knight=3; pawn=3; total=11.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00131", "split": "perception", "task_type": "material_balance_trace", "fen": "rnb2rk1/p4pp1/2p1pq1p/1p6/1PpP4/1PN1PN2/5PPP/R2QKB1R w KQ - 0 11", "prompt": "FEN: rnb2rk1/p4pp1/2p1pq1p/1p6/1PpP4/1PN1PN2/5PPP/R2QKB1R w KQ - 0 11\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=e1; queen=d1; rook=a1,h1; bishop=f1; knight=c3,f3; pawn=f2,g2,h2,b3,e3,b4,d4 | black king=g8; queen=f6; rook=a8,f8; bishop=c8; knight=b8; pawn=c4,b5,c6,e6,h6,a7,f7,g7\nCounts: white king=1; queen=1; rook=2; bishop=1; knight=2; pawn=7 | black king=1; queen=1; rook=2; bishop=1; knight=1; pawn=8\nValues: white total=35; black total=33\nBalance: White is up 2 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00132", "split": "perception", "task_type": "multi_state_tracking", "fen": "6k1/4qp1p/1p2p1p1/p2bN3/Pn1Pp3/BP2P3/5PPP/1Q4K1 b - - 1 26", "prompt": "Starting FEN: 6k1/4qp1p/1p2p1p1/p2bN3/Pn1Pp3/BP2P3/5PPP/1Q4K1 b - - 1 26\nAfter the moves g8h8 h2h3 h7h5, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 26\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 7k/4qp2/1p2p1p1/p2bN2p/Pn1Pp3/BP2P2P/5PP1/1Q4K1 w - - 0 28", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "g8h8 h2h3 h7h5", "_multi_state_tracking_result": "7k/4qp2/1p2p1p1/p2bN2p/Pn1Pp3/BP2P2P/5PP1/1Q4K1 w - - 0 28", "diagnostic": true, "hard_gate": false, "moves": "g8h8 h2h3 h7h5"}} {"example_id": "perception_00133", "split": "perception", "task_type": "board_print", "fen": "r1b2rk1/ppp3pp/8/3P4/1q1PnB2/4P3/P1Q2PPP/2RK1B1R b - -", "prompt": "Position (FEN): r1b2rk1/ppp3pp/8/3P4/1q1PnB2/4P3/P1Q2PPP/2RK1B1R b - -\nShow me the board.", "gold_answer": "8 r . b . . r k .\n7 p p p . . . p p\n6 . . . . . . . .\n5 . . . P . . . .\n4 . q . P n B . .\n3 . . . . P . . .\n2 P . Q . . P P P\n1 . . R K . B . R\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00134", "split": "perception", "task_type": "board_to_fen", "fen": "r2q1rk1/pbppbppp/np2pn2/6B1/2PP4/P1N1PN2/1P3PPP/R2QKB1R w KQ -", "prompt": "Here is the current board:\n8 r . . q . r k .\n7 p b p p b p p p\n6 n p . . p n . .\n5 . . . . . . B .\n4 . . P P . . . .\n3 P . N . P N . .\n2 . P . . . P P P\n1 R . . Q K B . R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r2q1rk1/pbppbppp/np2pn2/6B1/2PP4/P1N1PN2/1P3PPP/R2QKB1R w KQ - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00135", "split": "perception", "task_type": "piece_id", "fen": "r1bqkb1r/pppp2pp/2n5/4NP1n/4pPP1/8/PPPP3P/RNBQKB1R w KQkq -", "prompt": "FEN: r1bqkb1r/pppp2pp/2n5/4NP1n/4pPP1/8/PPPP3P/RNBQKB1R w KQkq -\nWhat piece is on g7?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "g7"}} {"example_id": "perception_00136", "split": "perception", "task_type": "material_count", "fen": "r3kq1r/pp1b2p1/5p1p/1Q2p3/N1Bp3B/8/PP4PP/4R1K1 w kq - 2 20", "prompt": "FEN: r3kq1r/pp1b2p1/5p1p/1Q2p3/N1Bp3B/8/PP4PP/4R1K1 w kq - 2 20\nWhat is the material count for both sides?", "gold_answer": "White (10 pieces): 2 bishops, 1 king, 1 knight, 4 pawns, 1 queen, 1 rook. Black (12 pieces): 1 bishop, 1 king, 7 pawns, 1 queen, 2 rooks. Black is up 2 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00137", "split": "perception", "task_type": "square_lookup", "fen": "r2k1b1r/p1pp2pp/b7/8/4R3/8/PPP2PPP/RNBQ2K1 b - - 0 12", "prompt": "FEN: r2k1b1r/p1pp2pp/b7/8/4R3/8/PPP2PPP/RNBQ2K1 b - - 0 12\nWhat is on g7?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "g7=black pawn", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "g7", "diagnostic": true, "hard_gate": false, "square": "g7"}} {"example_id": "perception_00138", "split": "perception", "task_type": "rank_lookup", "fen": "r1bq1rk1/3n1ppp/3bp3/1p1p4/p1pPPP2/P1P5/1PBNQ1PP/R1B2R1K w - - 0 16", "prompt": "FEN: r1bq1rk1/3n1ppp/3bp3/1p1p4/p1pPPP2/P1P5/1PBNQ1PP/R1B2R1K w - - 0 16\nWhat is the compressed FEN row for rank 3?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 3: P1P5", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "3", "_rank_lookup_row": "P1P5", "diagnostic": true, "hard_gate": false, "rank": "3", "fen_rank_row": "P1P5"}} {"example_id": "perception_00139", "split": "perception", "task_type": "square_coordinates", "fen": "r2qk2r/pb3p1p/1p2p1pb/n2pPn2/5P2/BPPB1NP1/2NPQ2P/R3K2R w KQkq -", "prompt": "FEN: r2qk2r/pb3p1p/1p2p1pb/n2pPn2/5P2/BPPB1NP1/2NPQ2P/R3K2R w KQkq -\nFor square b2, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "b2: file=b; rank=2; fen_row_from_top=7; file_index=2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "b2", "diagnostic": true, "hard_gate": false, "square": "b2"}} {"example_id": "perception_00140", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r4rk1/ppR2ppp/2n1q3/8/5Q2/2P3P1/P1PR1PKP/8 b - - 0 23", "prompt": "FEN: r4rk1/ppR2ppp/2n1q3/8/5Q2/2P3P1/P1PR1PKP/8 b - - 0 23\nCompressed rank 5 row: 8\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 5: a=1; b=1; c=1; d=1; e=1; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "5", "_fen_rank_expansion_row": "8", "diagnostic": true, "hard_gate": false, "rank": "5", "fen_rank_row": "8"}} {"example_id": "perception_00141", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "8/6p1/4kp1p/1R6/1p2p3/pK5P/6P1/8 w - - 0 50", "prompt": "Rank 3 row before: pK5P\nFile h changes from P to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 3: pK5P -> pK6", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "h3h4", "_fen_rank_cell_edit_square": "h3", "_fen_rank_cell_edit_rank": "3", "_fen_rank_cell_edit_file": "h", "_fen_rank_cell_edit_before_row": "pK5P", "_fen_rank_cell_edit_after_row": "pK6", "_fen_rank_cell_edit_before_fen": "P", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "h3h4", "square": "h3", "rank": "3", "file": "h", "before_row": "pK5P", "after_row": "pK6", "before_fen": "P", "after_fen": "1"}} {"example_id": "perception_00142", "split": "perception", "task_type": "fen_board_edit", "fen": "r1b2R2/ppk5/3p2p1/2p1b2p/2B5/2PP4/PP4PP/4R2K w - -", "prompt": "Board FEN before: r1b2R2/ppk5/3p2p1/2p1b2p/2B5/2PP4/PP4PP/4R2K\nApply square edits: f8 R->1; f3 1->R\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: r1b5/ppk5/3p2p1/2p1b2p/2B5/2PP1R2/PP4PP/4R2K", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "f8f3", "_fen_board_edit_board_fen_before": "r1b2R2/ppk5/3p2p1/2p1b2p/2B5/2PP4/PP4PP/4R2K", "_fen_board_edit_board_fen_after": "r1b5/ppk5/3p2p1/2p1b2p/2B5/2PP1R2/PP4PP/4R2K", "_fen_board_edit_edit_text": "f8 R->1; f3 1->R", "_fen_board_edit_changed_squares": [{"square": "f8", "before": "white rook", "after": "empty", "before_fen": "R", "after_fen": "1"}, {"square": "f3", "before": "empty", "after": "white rook", "before_fen": "1", "after_fen": "R"}], "diagnostic": true, "hard_gate": false, "move": "f8f3", "board_fen_before": "r1b2R2/ppk5/3p2p1/2p1b2p/2B5/2PP4/PP4PP/4R2K", "board_fen_after": "r1b5/ppk5/3p2p1/2p1b2p/2B5/2PP1R2/PP4PP/4R2K", "edit_text": "f8 R->1; f3 1->R", "changed_squares": [{"square": "f8", "before": "white rook", "after": "empty", "before_fen": "R", "after_fen": "1"}, {"square": "f3", "before": "empty", "after": "white rook", "before_fen": "1", "after_fen": "R"}]}} {"example_id": "perception_00143", "split": "perception", "task_type": "move_square_edits", "fen": "Qn2r1r1/2pk4/Bp2pB2/3pP3/3q2p1/7P/5P2/1R4K1 w - - 2 34", "prompt": "Starting FEN: Qn2r1r1/2pk4/Bp2pB2/3pP3/3q2p1/7P/5P2/1R4K1 w - - 2 34\nMove: b1b5\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: b1=white rook; b5=empty.\nSquares: b1 white rook->empty; b5 empty->white rook.\nRanks: rank 1 b R->1; rank 5 b 1->R.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "b1b5", "diagnostic": true, "hard_gate": false, "move": "b1b5"}} {"example_id": "perception_00144", "split": "perception", "task_type": "fen_assembly", "fen": "8/8/8/R7/3K4/1R6/2k5/8 w - -", "prompt": "Starting FEN: 8/8/8/R7/3K4/1R6/2k5/8 w - - 0 1\nMove: a5a4\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white rook a5a4.\nLookup: a5=white rook; a4=empty.\nSquares: a5 white rook->empty; a4 empty->white rook.\nRanks: rank 5 a R->1; rank 4 a 1->R.\nResult FEN: 8/8/8/8/R2K4/1R6/2k5/8 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "a5a4", "diagnostic": true, "hard_gate": false, "move": "a5a4"}} {"example_id": "perception_00145", "split": "perception", "task_type": "fen_row_application", "fen": "3r4/p7/5pp1/1pp2b1p/2k2N1P/2P2P2/P2B1KPR/3R4 b - - 3 28", "prompt": "Starting FEN: 3r4/p7/5pp1/1pp2b1p/2k2N1P/2P2P2/P2B1KPR/3R4 b - - 3 28\nMove: f5e4\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 3\nFullmove number: 28\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 5 1pp2b1p->1pp4p; rank 4 2k2N1P->2k1bN1P.\nResult FEN: 3r4/p7/5pp1/1pp4p/2k1bN1P/2P2P2/P2B1KPR/3R4 w - - 4 29", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "f5e4", "_fen_row_application_rank_rewrites": [{"rank": "5", "before": "1pp2b1p", "after": "1pp4p"}, {"rank": "4", "before": "2k2N1P", "after": "2k1bN1P"}], "diagnostic": true, "hard_gate": false, "move": "f5e4", "rank_rewrites": [{"rank": "5", "before": "1pp2b1p", "after": "1pp4p"}, {"rank": "4", "before": "2k2N1P", "after": "2k1bN1P"}]}} {"example_id": "perception_00146", "split": "perception", "task_type": "state_tracking", "fen": "3r1rk1/pp2ppbp/3q2p1/1Bpb4/5n2/PP2Q3/R2P1PPP/1NB1R1K1 b - - 10 17", "prompt": "Starting FEN: 3r1rk1/pp2ppbp/3q2p1/1Bpb4/5n2/PP2Q3/R2P1PPP/1NB1R1K1 b - - 10 17\nAfter the moves f7f6, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 10\nFullmove number: 17\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 3r1rk1/pp2p1bp/3q1pp1/1Bpb4/5n2/PP2Q3/R2P1PPP/1NB1R1K1 w - - 0 18", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "f7f6", "_state_tracking_result": "3r1rk1/pp2p1bp/3q1pp1/1Bpb4/5n2/PP2Q3/R2P1PPP/1NB1R1K1 w - - 0 18"}} {"example_id": "perception_00147", "split": "perception", "task_type": "material_inventory", "fen": "6k1/3N4/6BK/8/8/8/8/8 w - -", "prompt": "FEN: 6k1/3N4/6BK/8/8/8/8/8 w - -\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=h6; queen=none; rook=none; bishop=g6; knight=d7; pawn=none.\nBlack inventory: king=g8; queen=none; rook=none; bishop=none; knight=none; pawn=none.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00148", "split": "perception", "task_type": "material_piece_counts", "fen": "8/P7/2b2p1p/2K2Pp1/6P1/7k/4B3/8 b - - 1 55", "prompt": "FEN: 8/P7/2b2p1p/2K2Pp1/6P1/7k/4B3/8 b - - 1 55\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=0; bishop=1; knight=0; pawn=3.\nBlack counts: king=1; queen=0; rook=0; bishop=1; knight=0; pawn=3.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00149", "split": "perception", "task_type": "material_value_totals", "fen": "rn3r2/5p1k/p4q1p/3p1np1/Np3Q2/1P3N1P/P1PP1PP1/R4RK1 w - - 0 21", "prompt": "FEN: rn3r2/5p1k/p4q1p/3p1np1/Np3Q2/1P3N1P/P1PP1PP1/R4RK1 w - - 0 21\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=0; knight=6; pawn=7; total=32.\nBlack values: king=0; queen=9; rook=10; bishop=0; knight=6; pawn=6; total=31.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00150", "split": "perception", "task_type": "material_balance_trace", "fen": "r1b1k1nr/pp1p1p1p/2p1n3/2Q1P3/2B5/2N5/PPP3PP/R4RK1 b kq -", "prompt": "FEN: r1b1k1nr/pp1p1p1p/2p1n3/2Q1P3/2B5/2N5/PPP3PP/R4RK1 b kq -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=c5; rook=a1,f1; bishop=c4; knight=c3; pawn=a2,b2,c2,g2,h2,e5 | black king=e8; queen=none; rook=a8,h8; bishop=c8; knight=e6,g8; pawn=c6,a7,b7,d7,f7,h7\nCounts: white king=1; queen=1; rook=2; bishop=1; knight=1; pawn=6 | black king=1; queen=0; rook=2; bishop=1; knight=2; pawn=6\nValues: white total=31; black total=25\nBalance: White is up 6 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00151", "split": "perception", "task_type": "multi_state_tracking", "fen": "8/8/8/8/Q7/3k4/8/4K3 w - -", "prompt": "Starting FEN: 8/8/8/8/Q7/3k4/8/4K3 w - - 0 1\nAfter the moves a4b3 d3e4 b3b7, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 8/1Q6/8/8/4k3/8/8/4K3 b - - 3 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "a4b3 d3e4 b3b7", "_multi_state_tracking_result": "8/1Q6/8/8/4k3/8/8/4K3 b - - 3 2", "diagnostic": true, "hard_gate": false, "moves": "a4b3 d3e4 b3b7"}} {"example_id": "perception_00152", "split": "perception", "task_type": "board_print", "fen": "r1bqk3/ppp2pBp/4p3/1PPp4/5nn1/4P3/3N1P1P/R2QKBNR b KQq - 0 14", "prompt": "Position (FEN): r1bqk3/ppp2pBp/4p3/1PPp4/5nn1/4P3/3N1P1P/R2QKBNR b KQq - 0 14\nShow me the board.", "gold_answer": "8 r . b q k . . .\n7 p p p . . p B p\n6 . . . . p . . .\n5 . P P p . . . .\n4 . . . . . n n .\n3 . . . . P . . .\n2 . . . N . P . P\n1 R . . Q K B N R\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00153", "split": "perception", "task_type": "board_to_fen", "fen": "rnbqkb1r/1p1p1ppp/2p2n2/p7/2P1Pp2/2NP4/PP4PP/R1BQKBNR w KQkq -", "prompt": "Here is the current board:\n8 r n b q k b . r\n7 . p . p . p p p\n6 . . p . . n . .\n5 p . . . . . . .\n4 . . P . P p . .\n3 . . N P . . . .\n2 P P . . . . P P\n1 R . B Q K B N R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "rnbqkb1r/1p1p1ppp/2p2n2/p7/2P1Pp2/2NP4/PP4PP/R1BQKBNR w KQkq - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00154", "split": "perception", "task_type": "piece_id", "fen": "r1b1r1k1/pp3p2/7Q/2pq2p1/1nNp1b2/3P4/PPP2BPP/1K1R2NR b - - 6 18", "prompt": "FEN: r1b1r1k1/pp3p2/7Q/2pq2p1/1nNp1b2/3P4/PPP2BPP/1K1R2NR b - - 6 18\nWhat piece is on b4?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black knight", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "b4"}} {"example_id": "perception_00155", "split": "perception", "task_type": "material_count", "fen": "rnbqkb1r/pp2pppp/5n2/2pP4/8/2N2N2/PP1PPPPP/R1BQKB1R b KQkq -", "prompt": "FEN: rnbqkb1r/pp2pppp/5n2/2pP4/8/2N2N2/PP1PPPPP/R1BQKB1R b KQkq -\nWhat is the material count for both sides?", "gold_answer": "White (16 pieces): 2 bishops, 1 king, 2 knights, 8 pawns, 1 queen, 2 rooks. Black (15 pieces): 2 bishops, 1 king, 2 knights, 7 pawns, 1 queen, 2 rooks. White is up 1 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00156", "split": "perception", "task_type": "square_lookup", "fen": "rn3rk1/1bp2pp1/p4b1p/1p1P4/4BN2/q1P4P/PN1Q1PP1/R1R3K1 b - - 5 20", "prompt": "FEN: rn3rk1/1bp2pp1/p4b1p/1p1P4/4BN2/q1P4P/PN1Q1PP1/R1R3K1 b - - 5 20\nWhat is on a5?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "a5=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "a5", "diagnostic": true, "hard_gate": false, "square": "a5"}} {"example_id": "perception_00157", "split": "perception", "task_type": "rank_lookup", "fen": "8/1p4p1/2k2p1p/5P2/4P1PP/3K4/8/8 w - -", "prompt": "FEN: 8/1p4p1/2k2p1p/5P2/4P1PP/3K4/8/8 w - -\nWhat is the compressed FEN row for rank 4?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 4: 4P1PP", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "4", "_rank_lookup_row": "4P1PP", "diagnostic": true, "hard_gate": false, "rank": "4", "fen_rank_row": "4P1PP"}} {"example_id": "perception_00158", "split": "perception", "task_type": "square_coordinates", "fen": "r2q1rk1/3bpnbp/p2p1pp1/1ppP4/2P1PP1P/2BB2N1/PPQ3P1/4RRK1 w - -", "prompt": "FEN: r2q1rk1/3bpnbp/p2p1pp1/1ppP4/2P1PP1P/2BB2N1/PPQ3P1/4RRK1 w - -\nFor square f8, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "f8: file=f; rank=8; fen_row_from_top=1; file_index=6", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "f8", "diagnostic": true, "hard_gate": false, "square": "f8"}} {"example_id": "perception_00159", "split": "perception", "task_type": "fen_rank_expansion", "fen": "8/5K2/2pk4/6P1/8/8/8/8 w - -", "prompt": "FEN: 8/5K2/2pk4/6P1/8/8/8/8 w - -\nCompressed rank 2 row: 8\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 2: a=1; b=1; c=1; d=1; e=1; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "2", "_fen_rank_expansion_row": "8", "diagnostic": true, "hard_gate": false, "rank": "2", "fen_rank_row": "8"}} {"example_id": "perception_00160", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "6r1/2p4p/p1k3b1/8/1P1Bp1p1/P3P2P/2P5/R4RK1 w - - 0 25", "prompt": "Rank 5 row before: 8\nFile e changes from 1 to B. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 5: 8 -> 4B3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "d4e5", "_fen_rank_cell_edit_square": "e5", "_fen_rank_cell_edit_rank": "5", "_fen_rank_cell_edit_file": "e", "_fen_rank_cell_edit_before_row": "8", "_fen_rank_cell_edit_after_row": "4B3", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "B", "diagnostic": true, "hard_gate": false, "move": "d4e5", "square": "e5", "rank": "5", "file": "e", "before_row": "8", "after_row": "4B3", "before_fen": "1", "after_fen": "B"}} {"example_id": "perception_00161", "split": "perception", "task_type": "fen_board_edit", "fen": "1r4k1/1b1R1p1p/4p1p1/1pp1P3/p7/P7/BPP1NP1P/6K1 b - - 1 23", "prompt": "Board FEN before: 1r4k1/1b1R1p1p/4p1p1/1pp1P3/p7/P7/BPP1NP1P/6K1\nApply square edits: g8 k->1; g7 1->k\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 1r6/1b1R1pkp/4p1p1/1pp1P3/p7/P7/BPP1NP1P/6K1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "g8g7", "_fen_board_edit_board_fen_before": "1r4k1/1b1R1p1p/4p1p1/1pp1P3/p7/P7/BPP1NP1P/6K1", "_fen_board_edit_board_fen_after": "1r6/1b1R1pkp/4p1p1/1pp1P3/p7/P7/BPP1NP1P/6K1", "_fen_board_edit_edit_text": "g8 k->1; g7 1->k", "_fen_board_edit_changed_squares": [{"square": "g8", "before": "black king", "after": "empty", "before_fen": "k", "after_fen": "1"}, {"square": "g7", "before": "empty", "after": "black king", "before_fen": "1", "after_fen": "k"}], "diagnostic": true, "hard_gate": false, "move": "g8g7", "board_fen_before": "1r4k1/1b1R1p1p/4p1p1/1pp1P3/p7/P7/BPP1NP1P/6K1", "board_fen_after": "1r6/1b1R1pkp/4p1p1/1pp1P3/p7/P7/BPP1NP1P/6K1", "edit_text": "g8 k->1; g7 1->k", "changed_squares": [{"square": "g8", "before": "black king", "after": "empty", "before_fen": "k", "after_fen": "1"}, {"square": "g7", "before": "empty", "after": "black king", "before_fen": "1", "after_fen": "k"}]}} {"example_id": "perception_00162", "split": "perception", "task_type": "move_square_edits", "fen": "r2q1k2/p7/2p2n1r/7p/2BQ2P1/7P/PP6/4RRK1 w - - 1 25", "prompt": "Starting FEN: r2q1k2/p7/2p2n1r/7p/2BQ2P1/7P/PP6/4RRK1 w - - 1 25\nMove: h3h4\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: h3=white pawn; h4=empty.\nSquares: h3 white pawn->empty; h4 empty->white pawn.\nRanks: rank 3 h P->1; rank 4 h 1->P.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "h3h4", "diagnostic": true, "hard_gate": false, "move": "h3h4"}} {"example_id": "perception_00163", "split": "perception", "task_type": "fen_assembly", "fen": "5K2/P7/8/8/6k1/5b2/7p/8 w - - 0 52", "prompt": "Starting FEN: 5K2/P7/8/8/6k1/5b2/7p/8 w - - 0 52\nMove: a7a8n\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 52\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white pawn a7a8n. Promotes to white knight.\nLookup: a7=white pawn; a8=empty.\nSquares: a7 white pawn->empty; a8 empty->white knight.\nRanks: rank 7 a P->1; rank 8 a 1->N.\nResult FEN: N4K2/8/8/8/6k1/5b2/7p/8 b - - 0 52", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "a7a8n", "diagnostic": true, "hard_gate": false, "move": "a7a8n"}} {"example_id": "perception_00164", "split": "perception", "task_type": "fen_row_application", "fen": "r1bq2rk/1p1p4/p1n1pPQp/3n4/4N3/1N1B4/PPPb2PP/R4R1K w - -", "prompt": "Starting FEN: r1bq2rk/1p1p4/p1n1pPQp/3n4/4N3/1N1B4/PPPb2PP/R4R1K w - - 0 1\nMove: a2a4\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 2 PPPb2PP->1PPb2PP; rank 4 4N3->P3N3.\nResult FEN: r1bq2rk/1p1p4/p1n1pPQp/3n4/P3N3/1N1B4/1PPb2PP/R4R1K b - - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "a2a4", "_fen_row_application_rank_rewrites": [{"rank": "2", "before": "PPPb2PP", "after": "1PPb2PP"}, {"rank": "4", "before": "4N3", "after": "P3N3"}], "diagnostic": true, "hard_gate": false, "move": "a2a4", "rank_rewrites": [{"rank": "2", "before": "PPPb2PP", "after": "1PPb2PP"}, {"rank": "4", "before": "4N3", "after": "P3N3"}]}} {"example_id": "perception_00165", "split": "perception", "task_type": "state_tracking", "fen": "r2q1rk1/1p3p1p/2bpp1p1/p1n1b3/2P1P3/1PN2P2/P2Q1BPP/1R1R1BK1 b - -", "prompt": "Starting FEN: r2q1rk1/1p3p1p/2bpp1p1/p1n1b3/2P1P3/1PN2P2/P2Q1BPP/1R1R1BK1 b - - 0 1\nAfter the moves d8c7, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r4rk1/1pq2p1p/2bpp1p1/p1n1b3/2P1P3/1PN2P2/P2Q1BPP/1R1R1BK1 w - - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "d8c7", "_state_tracking_result": "r4rk1/1pq2p1p/2bpp1p1/p1n1b3/2P1P3/1PN2P2/P2Q1BPP/1R1R1BK1 w - - 1 2"}} {"example_id": "perception_00166", "split": "perception", "task_type": "material_inventory", "fen": "2r2rk1/5pbp/p2q2p1/1pNp1b2/1P1PPp2/P4P2/3NQ1PP/R1R3K1 b - - 0 23", "prompt": "FEN: 2r2rk1/5pbp/p2q2p1/1pNp1b2/1P1PPp2/P4P2/3NQ1PP/R1R3K1 b - - 0 23\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=e2; rook=a1,c1; bishop=none; knight=d2,c5; pawn=g2,h2,a3,f3,b4,d4,e4.\nBlack inventory: king=g8; queen=d6; rook=c8,f8; bishop=f5,g7; knight=none; pawn=f4,b5,d5,a6,g6,f7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00167", "split": "perception", "task_type": "material_piece_counts", "fen": "r4rk1/pp1n1ppp/1q1bpn2/3p2B1/3P4/2P2N2/PPQ2PPP/RN3RK1 w - - 5 11", "prompt": "FEN: r4rk1/pp1n1ppp/1q1bpn2/3p2B1/3P4/2P2N2/PPQ2PPP/RN3RK1 w - - 5 11\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=1; knight=2; pawn=7.\nBlack counts: king=1; queen=1; rook=2; bishop=1; knight=2; pawn=7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00168", "split": "perception", "task_type": "material_value_totals", "fen": "8/8/8/4p1p1/8/5P2/4k3/6K1 w - -", "prompt": "FEN: 8/8/8/4p1p1/8/5P2/4k3/6K1 w - -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=0; bishop=0; knight=0; pawn=1; total=1.\nBlack values: king=0; queen=0; rook=0; bishop=0; knight=0; pawn=2; total=2.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00169", "split": "perception", "task_type": "material_balance_trace", "fen": "r1b2r1k/1q2bppp/pp2p2B/4n3/3N4/2N3R1/PPP2PPP/3R2K1 w - -", "prompt": "FEN: r1b2r1k/1q2bppp/pp2p2B/4n3/3N4/2N3R1/PPP2PPP/3R2K1 w - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=none; rook=d1,g3; bishop=h6; knight=c3,d4; pawn=a2,b2,c2,f2,g2,h2 | black king=h8; queen=b7; rook=a8,f8; bishop=e7,c8; knight=e5; pawn=a6,b6,e6,f7,g7,h7\nCounts: white king=1; queen=0; rook=2; bishop=1; knight=2; pawn=6 | black king=1; queen=1; rook=2; bishop=2; knight=1; pawn=6\nValues: white total=25; black total=34\nBalance: Black is up 9 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00170", "split": "perception", "task_type": "multi_state_tracking", "fen": "r5k1/p2R1ppp/1p2p3/1P2P3/P7/5PPP/1Bn3K1/8 w - - 2 36", "prompt": "Starting FEN: r5k1/p2R1ppp/1p2p3/1P2P3/P7/5PPP/1Bn3K1/8 w - - 2 36\nAfter the moves b2d4 a8c8 d4b6, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 2\nFullmove number: 36\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 2r3k1/p2R1ppp/1B2p3/1P2P3/P7/5PPP/2n3K1/8 b - - 0 37", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "b2d4 a8c8 d4b6", "_multi_state_tracking_result": "2r3k1/p2R1ppp/1B2p3/1P2P3/P7/5PPP/2n3K1/8 b - - 0 37", "diagnostic": true, "hard_gate": false, "moves": "b2d4 a8c8 d4b6"}} {"example_id": "perception_00171", "split": "perception", "task_type": "board_print", "fen": "1nr2k2/5pp1/p2p3p/1b1B4/1Q5N/4K1P1/5P1P/7R b - - 0 29", "prompt": "Position (FEN): 1nr2k2/5pp1/p2p3p/1b1B4/1Q5N/4K1P1/5P1P/7R b - - 0 29\nShow me the board.", "gold_answer": "8 . n r . . k . .\n7 . . . . . p p .\n6 p . . p . . . p\n5 . b . B . . . .\n4 . Q . . . . . N\n3 . . . . K . P .\n2 . . . . . P . P\n1 . . . . . . . R\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00172", "split": "perception", "task_type": "board_to_fen", "fen": "2kr1b1r/ppp2ppp/2n1b3/q5N1/3p4/5N2/PPP2PPP/R1BQR1K1 w - -", "prompt": "Here is the current board:\n8 . . k r . b . r\n7 p p p . . p p p\n6 . . n . b . . .\n5 q . . . . . N .\n4 . . . p . . . .\n3 . . . . . N . .\n2 P P P . . P P P\n1 R . B Q R . K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "2kr1b1r/ppp2ppp/2n1b3/q5N1/3p4/5N2/PPP2PPP/R1BQR1K1 w - - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00173", "split": "perception", "task_type": "piece_id", "fen": "r1bq1rk1/4Bpbp/3p2p1/2pP4/1n6/pPpP1N1P/P1B2PP1/R2QR1K1 b - -", "prompt": "FEN: r1bq1rk1/4Bpbp/3p2p1/2pP4/1n6/pPpP1N1P/P1B2PP1/R2QR1K1 b - -\nWhat piece is on d5?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "d5"}} {"example_id": "perception_00174", "split": "perception", "task_type": "material_count", "fen": "rn1qkb1r/ppp2ppp/4pn2/5b2/2B5/P1N2N1P/1PPP1PP1/R1BQK2R b KQkq -", "prompt": "FEN: rn1qkb1r/ppp2ppp/4pn2/5b2/2B5/P1N2N1P/1PPP1PP1/R1BQK2R b KQkq -\nWhat is the material count for both sides?", "gold_answer": "White (15 pieces): 2 bishops, 1 king, 2 knights, 7 pawns, 1 queen, 2 rooks. Black (15 pieces): 2 bishops, 1 king, 2 knights, 7 pawns, 1 queen, 2 rooks. Material is equal.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00175", "split": "perception", "task_type": "square_lookup", "fen": "rnb1kb1r/pp3ppp/5n2/2pp4/3P1B2/4PN2/Pq1N1PPP/R2QKB1R w KQkq -", "prompt": "FEN: rnb1kb1r/pp3ppp/5n2/2pp4/3P1B2/4PN2/Pq1N1PPP/R2QKB1R w KQkq -\nWhat is on e6?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "e6=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "e6", "diagnostic": true, "hard_gate": false, "square": "e6"}} {"example_id": "perception_00176", "split": "perception", "task_type": "rank_lookup", "fen": "6k1/1p3pp1/p3p2p/3pP1PP/1b3P2/7K/4R1B1/r5q1 b - - 0 32", "prompt": "FEN: 6k1/1p3pp1/p3p2p/3pP1PP/1b3P2/7K/4R1B1/r5q1 b - - 0 32\nWhat is the compressed FEN row for rank 4?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 4: 1b3P2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "4", "_rank_lookup_row": "1b3P2", "diagnostic": true, "hard_gate": false, "rank": "4", "fen_rank_row": "1b3P2"}} {"example_id": "perception_00177", "split": "perception", "task_type": "square_coordinates", "fen": "r3k2r/pp1nbppp/2p2n2/7q/3N4/1BPP1P1b/PP2Q2P/RNB1K2R w KQkq - 1 13", "prompt": "FEN: r3k2r/pp1nbppp/2p2n2/7q/3N4/1BPP1P1b/PP2Q2P/RNB1K2R w KQkq - 1 13\nFor square c4, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "c4: file=c; rank=4; fen_row_from_top=5; file_index=3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "c4", "diagnostic": true, "hard_gate": false, "square": "c4"}} {"example_id": "perception_00178", "split": "perception", "task_type": "fen_rank_expansion", "fen": "2r2rk1/pp4pp/2b2p2/3pp3/8/1N2bN2/PPP3PP/1K1R1R2 w - - 4 19", "prompt": "FEN: 2r2rk1/pp4pp/2b2p2/3pp3/8/1N2bN2/PPP3PP/1K1R1R2 w - - 4 19\nCompressed rank 5 row: 3pp3\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 5: a=1; b=1; c=1; d=p; e=p; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "5", "_fen_rank_expansion_row": "3pp3", "diagnostic": true, "hard_gate": false, "rank": "5", "fen_rank_row": "3pp3"}} {"example_id": "perception_00179", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "8/p1p2k2/2B2rp1/6R1/P7/1P6/3r2P1/4R1K1 b - - 0 34", "prompt": "Rank 7 row before: p1p2k2\nFile d changes from 1 to r. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 7: p1p2k2 -> p1pr1k2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "d2d7", "_fen_rank_cell_edit_square": "d7", "_fen_rank_cell_edit_rank": "7", "_fen_rank_cell_edit_file": "d", "_fen_rank_cell_edit_before_row": "p1p2k2", "_fen_rank_cell_edit_after_row": "p1pr1k2", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "r", "diagnostic": true, "hard_gate": false, "move": "d2d7", "square": "d7", "rank": "7", "file": "d", "before_row": "p1p2k2", "after_row": "p1pr1k2", "before_fen": "1", "after_fen": "r"}} {"example_id": "perception_00180", "split": "perception", "task_type": "fen_board_edit", "fen": "8/8/1K6/3k4/2q5/2b5/8/8 w - - 31 85", "prompt": "Board FEN before: 8/8/1K6/3k4/2q5/2b5/8/8\nApply square edits: b6 K->1; a7 1->K\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 8/K7/8/3k4/2q5/2b5/8/8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "b6a7", "_fen_board_edit_board_fen_before": "8/8/1K6/3k4/2q5/2b5/8/8", "_fen_board_edit_board_fen_after": "8/K7/8/3k4/2q5/2b5/8/8", "_fen_board_edit_edit_text": "b6 K->1; a7 1->K", "_fen_board_edit_changed_squares": [{"square": "b6", "before": "white king", "after": "empty", "before_fen": "K", "after_fen": "1"}, {"square": "a7", "before": "empty", "after": "white king", "before_fen": "1", "after_fen": "K"}], "diagnostic": true, "hard_gate": false, "move": "b6a7", "board_fen_before": "8/8/1K6/3k4/2q5/2b5/8/8", "board_fen_after": "8/K7/8/3k4/2q5/2b5/8/8", "edit_text": "b6 K->1; a7 1->K", "changed_squares": [{"square": "b6", "before": "white king", "after": "empty", "before_fen": "K", "after_fen": "1"}, {"square": "a7", "before": "empty", "after": "white king", "before_fen": "1", "after_fen": "K"}]}} {"example_id": "perception_00181", "split": "perception", "task_type": "move_square_edits", "fen": "rnbq1rk1/ppp1bppp/5n2/4p3/3N1P2/2N5/PPP3PP/R1BQKB1R w KQ - 0 8", "prompt": "Starting FEN: rnbq1rk1/ppp1bppp/5n2/4p3/3N1P2/2N5/PPP3PP/R1BQKB1R w KQ - 0 8\nMove: h2h3\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: h2=white pawn; h3=empty.\nSquares: h2 white pawn->empty; h3 empty->white pawn.\nRanks: rank 2 h P->1; rank 3 h 1->P.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "h2h3", "diagnostic": true, "hard_gate": false, "move": "h2h3"}} {"example_id": "perception_00182", "split": "perception", "task_type": "fen_assembly", "fen": "3r2k1/p4ppp/8/4P3/2PB4/1P2P1P1/P1r1N2P/R3K3 b - -", "prompt": "Starting FEN: 3r2k1/p4ppp/8/4P3/2PB4/1P2P1P1/P1r1N2P/R3K3 b - - 0 1\nMove: c2d2\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black rook c2d2.\nLookup: c2=black rook; d2=empty.\nSquares: c2 black rook->empty; d2 empty->black rook.\nRanks: rank 2 c r->1; rank 2 d 1->r.\nResult FEN: 3r2k1/p4ppp/8/4P3/2PB4/1P2P1P1/P2rN2P/R3K3 w - - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "c2d2", "diagnostic": true, "hard_gate": false, "move": "c2d2"}} {"example_id": "perception_00183", "split": "perception", "task_type": "fen_row_application", "fen": "1n1q1rk1/r3ppbp/p2p1Bp1/1p6/3NP3/P1P5/1P3PPP/RN1Q1RK1 b - - 0 14", "prompt": "Starting FEN: 1n1q1rk1/r3ppbp/p2p1Bp1/1p6/3NP3/P1P5/1P3PPP/RN1Q1RK1 b - - 0 14\nMove: d8c8\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 14\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 8 1n1q1rk1->1nq2rk1.\nResult FEN: 1nq2rk1/r3ppbp/p2p1Bp1/1p6/3NP3/P1P5/1P3PPP/RN1Q1RK1 w - - 1 15", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "d8c8", "_fen_row_application_rank_rewrites": [{"rank": "8", "before": "1n1q1rk1", "after": "1nq2rk1"}], "diagnostic": true, "hard_gate": false, "move": "d8c8", "rank_rewrites": [{"rank": "8", "before": "1n1q1rk1", "after": "1nq2rk1"}]}} {"example_id": "perception_00184", "split": "perception", "task_type": "state_tracking", "fen": "6k1/4pp2/3p2p1/8/2p1P3/3n1RPP/1r6/5BK1 b - -", "prompt": "Starting FEN: 6k1/4pp2/3p2p1/8/2p1P3/3n1RPP/1r6/5BK1 b - - 0 1\nAfter the moves b2b5, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 6k1/4pp2/3p2p1/1r6/2p1P3/3n1RPP/8/5BK1 w - - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "b2b5", "_state_tracking_result": "6k1/4pp2/3p2p1/1r6/2p1P3/3n1RPP/8/5BK1 w - - 1 2"}} {"example_id": "perception_00185", "split": "perception", "task_type": "material_inventory", "fen": "3qk1r1/pbr1bppp/2p2n2/5N2/N2p4/1P6/2PPQPPP/R1B1R1K1 b - - 0 16", "prompt": "FEN: 3qk1r1/pbr1bppp/2p2n2/5N2/N2p4/1P6/2PPQPPP/R1B1R1K1 b - - 0 16\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=e2; rook=a1,e1; bishop=c1; knight=a4,f5; pawn=c2,d2,f2,g2,h2,b3.\nBlack inventory: king=e8; queen=d8; rook=c7,g8; bishop=b7,e7; knight=f6; pawn=d4,c6,a7,f7,g7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00186", "split": "perception", "task_type": "material_piece_counts", "fen": "5r2/p4p2/1p3k2/4pp1R/2P5/1P3B2/P2r2P1/5RK1 w - - 4 31", "prompt": "FEN: 5r2/p4p2/1p3k2/4pp1R/2P5/1P3B2/P2r2P1/5RK1 w - - 4 31\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=2; bishop=1; knight=0; pawn=4.\nBlack counts: king=1; queen=0; rook=2; bishop=0; knight=0; pawn=5.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00187", "split": "perception", "task_type": "material_value_totals", "fen": "6k1/5p1p/4r1p1/4P3/4K3/5P2/3R3P/8 w - -", "prompt": "FEN: 6k1/5p1p/4r1p1/4P3/4K3/5P2/3R3P/8 w - -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=5; bishop=0; knight=0; pawn=3; total=8.\nBlack values: king=0; queen=0; rook=5; bishop=0; knight=0; pawn=3; total=8.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00188", "split": "perception", "task_type": "material_balance_trace", "fen": "8/8/pp1k4/3p2p1/1P3p2/P1R5/4r1PK/8 w - - 0 41", "prompt": "FEN: 8/8/pp1k4/3p2p1/1P3p2/P1R5/4r1PK/8 w - - 0 41\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=h2; queen=none; rook=c3; bishop=none; knight=none; pawn=g2,a3,b4 | black king=d6; queen=none; rook=e2; bishop=none; knight=none; pawn=f4,d5,g5,a6,b6\nCounts: white king=1; queen=0; rook=1; bishop=0; knight=0; pawn=3 | black king=1; queen=0; rook=1; bishop=0; knight=0; pawn=5\nValues: white total=8; black total=10\nBalance: Black is up 2 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00189", "split": "perception", "task_type": "multi_state_tracking", "fen": "rnbqk1nr/pp2ppb1/3p2pp/2p5/3PP2B/2P2N2/PP3PPP/RN1QKB1R b KQkq -", "prompt": "Starting FEN: rnbqk1nr/pp2ppb1/3p2pp/2p5/3PP2B/2P2N2/PP3PPP/RN1QKB1R b KQkq - 0 1\nAfter the moves f7f6 h4g5, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rnbqk1nr/pp2p1b1/3p1ppp/2p3B1/3PP3/2P2N2/PP3PPP/RN1QKB1R b KQkq - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "f7f6 h4g5", "_multi_state_tracking_result": "rnbqk1nr/pp2p1b1/3p1ppp/2p3B1/3PP3/2P2N2/PP3PPP/RN1QKB1R b KQkq - 1 2", "diagnostic": true, "hard_gate": false, "moves": "f7f6 h4g5"}} {"example_id": "perception_00190", "split": "perception", "task_type": "board_print", "fen": "r2qk1nr/ppp2ppp/1bnp4/4p3/1P2P3/1BP2b1P/P2P1PP1/RNBQK2R w KQkq -", "prompt": "Position (FEN): r2qk1nr/ppp2ppp/1bnp4/4p3/1P2P3/1BP2b1P/P2P1PP1/RNBQK2R w KQkq -\nShow me the board.", "gold_answer": "8 r . . q k . n r\n7 p p p . . p p p\n6 . b n p . . . .\n5 . . . . p . . .\n4 . P . . P . . .\n3 . B P . . b . P\n2 P . . P . P P .\n1 R N B Q K . . R\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00191", "split": "perception", "task_type": "board_to_fen", "fen": "5r2/8/8/4BK2/8/1R1pkP2/8/8 w - -", "prompt": "Here is the current board:\n8 . . . . . r . .\n7 . . . . . . . .\n6 . . . . . . . .\n5 . . . . B K . .\n4 . . . . . . . .\n3 . R . p k P . .\n2 . . . . . . . .\n1 . . . . . . . .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "5r2/8/8/4BK2/8/1R1pkP2/8/8 w - - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00192", "split": "perception", "task_type": "piece_id", "fen": "r2q3r/pb1k4/1p1b1p2/2p1pB2/1BP3Pp/4P3/PP2QPP1/2KR3R b - - 3 18", "prompt": "FEN: r2q3r/pb1k4/1p1b1p2/2p1pB2/1BP3Pp/4P3/PP2QPP1/2KR3R b - - 3 18\nWhat piece is on f6?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "f6"}} {"example_id": "perception_00193", "split": "perception", "task_type": "material_count", "fen": "rnb1k2r/pp2npbp/2pp1qp1/4p3/4P3/2NP1NQ1/PPP2PPP/R1B1KB1R w KQkq - 0 8", "prompt": "FEN: rnb1k2r/pp2npbp/2pp1qp1/4p3/4P3/2NP1NQ1/PPP2PPP/R1B1KB1R w KQkq - 0 8\nWhat is the material count for both sides?", "gold_answer": "White (16 pieces): 2 bishops, 1 king, 2 knights, 8 pawns, 1 queen, 2 rooks. Black (16 pieces): 2 bishops, 1 king, 2 knights, 8 pawns, 1 queen, 2 rooks. Material is equal.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00194", "split": "perception", "task_type": "square_lookup", "fen": "2krr3/pp1n3p/2pb1pp1/8/4PP2/6N1/PPP2P1P/4RRK1 w - - 0 18", "prompt": "FEN: 2krr3/pp1n3p/2pb1pp1/8/4PP2/6N1/PPP2P1P/4RRK1 w - - 0 18\nWhat is on a8?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "a8=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "a8", "diagnostic": true, "hard_gate": false, "square": "a8"}} {"example_id": "perception_00195", "split": "perception", "task_type": "rank_lookup", "fen": "2rr2k1/p4qb1/1p1p2pp/4p3/2P5/1PN1Q1P1/P4P1P/2RR2K1 b - -", "prompt": "FEN: 2rr2k1/p4qb1/1p1p2pp/4p3/2P5/1PN1Q1P1/P4P1P/2RR2K1 b - -\nWhat is the compressed FEN row for rank 4?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 4: 2P5", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "4", "_rank_lookup_row": "2P5", "diagnostic": true, "hard_gate": false, "rank": "4", "fen_rank_row": "2P5"}} {"example_id": "perception_00196", "split": "perception", "task_type": "square_coordinates", "fen": "8/p1pk2r1/4bb2/2Q5/4p2P/1P2P3/P1PP4/5K2 b - -", "prompt": "FEN: 8/p1pk2r1/4bb2/2Q5/4p2P/1P2P3/P1PP4/5K2 b - -\nFor square a7, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "a7: file=a; rank=7; fen_row_from_top=2; file_index=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "a7", "diagnostic": true, "hard_gate": false, "square": "a7"}} {"example_id": "perception_00197", "split": "perception", "task_type": "fen_rank_expansion", "fen": "3r2k1/1p1nqppp/1p3n2/4p3/1p2P3/2r3PP/1Q1NBP2/R1B2RK1 w - -", "prompt": "FEN: 3r2k1/1p1nqppp/1p3n2/4p3/1p2P3/2r3PP/1Q1NBP2/R1B2RK1 w - -\nCompressed rank 1 row: R1B2RK1\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 1: a=R; b=1; c=B; d=1; e=1; f=R; g=K; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "1", "_fen_rank_expansion_row": "R1B2RK1", "diagnostic": true, "hard_gate": false, "rank": "1", "fen_rank_row": "R1B2RK1"}} {"example_id": "perception_00198", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "6k1/6p1/4p3/8/1q6/6K1/8/1Nq5 b - -", "prompt": "Rank 4 row before: 1q6\nFile b changes from q to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 4: 1q6 -> 6q1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "b4g4", "_fen_rank_cell_edit_square": "b4", "_fen_rank_cell_edit_rank": "4", "_fen_rank_cell_edit_file": "b", "_fen_rank_cell_edit_before_row": "1q6", "_fen_rank_cell_edit_after_row": "6q1", "_fen_rank_cell_edit_before_fen": "q", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "b4g4", "square": "b4", "rank": "4", "file": "b", "before_row": "1q6", "after_row": "6q1", "before_fen": "q", "after_fen": "1"}} {"example_id": "perception_00199", "split": "perception", "task_type": "fen_board_edit", "fen": "4Rbk1/5p1p/1p4p1/pP6/P2q4/6P1/5P1P/1bR2BK1 w - - 1 31", "prompt": "Board FEN before: 4Rbk1/5p1p/1p4p1/pP6/P2q4/6P1/5P1P/1bR2BK1\nApply square edits: e8 R->1; c8 1->R\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 2R2bk1/5p1p/1p4p1/pP6/P2q4/6P1/5P1P/1bR2BK1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "e8c8", "_fen_board_edit_board_fen_before": "4Rbk1/5p1p/1p4p1/pP6/P2q4/6P1/5P1P/1bR2BK1", "_fen_board_edit_board_fen_after": "2R2bk1/5p1p/1p4p1/pP6/P2q4/6P1/5P1P/1bR2BK1", "_fen_board_edit_edit_text": "e8 R->1; c8 1->R", "_fen_board_edit_changed_squares": [{"square": "e8", "before": "white rook", "after": "empty", "before_fen": "R", "after_fen": "1"}, {"square": "c8", "before": "empty", "after": "white rook", "before_fen": "1", "after_fen": "R"}], "diagnostic": true, "hard_gate": false, "move": "e8c8", "board_fen_before": "4Rbk1/5p1p/1p4p1/pP6/P2q4/6P1/5P1P/1bR2BK1", "board_fen_after": "2R2bk1/5p1p/1p4p1/pP6/P2q4/6P1/5P1P/1bR2BK1", "edit_text": "e8 R->1; c8 1->R", "changed_squares": [{"square": "e8", "before": "white rook", "after": "empty", "before_fen": "R", "after_fen": "1"}, {"square": "c8", "before": "empty", "after": "white rook", "before_fen": "1", "after_fen": "R"}]}} {"example_id": "perception_00200", "split": "perception", "task_type": "move_square_edits", "fen": "rnb1kbnr/p1p1pppp/8/1P1q4/2pP4/4P3/1P3PPP/RNBQKBNR b KQkq - 0 5", "prompt": "Starting FEN: rnb1kbnr/p1p1pppp/8/1P1q4/2pP4/4P3/1P3PPP/RNBQKBNR b KQkq - 0 5\nMove: d5g5\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: d5=black queen; g5=empty.\nSquares: d5 black queen->empty; g5 empty->black queen.\nRanks: rank 5 d q->1; rank 5 g 1->q.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "d5g5", "diagnostic": true, "hard_gate": false, "move": "d5g5"}} {"example_id": "perception_00201", "split": "perception", "task_type": "fen_assembly", "fen": "rn1q1rk1/pb2bpp1/1p2pn1p/3P4/3P3B/2NB1N2/PPQ2PPP/R3K2R b KQ - 0 11", "prompt": "Starting FEN: rn1q1rk1/pb2bpp1/1p2pn1p/3P4/3P3B/2NB1N2/PPQ2PPP/R3K2R b KQ - 0 11\nMove: d8d7\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 0\nFullmove number: 11\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black queen d8d7.\nLookup: d8=black queen; d7=empty.\nSquares: d8 black queen->empty; d7 empty->black queen.\nRanks: rank 8 d q->1; rank 7 d 1->q.\nResult FEN: rn3rk1/pb1qbpp1/1p2pn1p/3P4/3P3B/2NB1N2/PPQ2PPP/R3K2R w KQ - 1 12", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "d8d7", "diagnostic": true, "hard_gate": false, "move": "d8d7"}} {"example_id": "perception_00202", "split": "perception", "task_type": "fen_row_application", "fen": "1r2r2k/p1p1nRbp/B2q2p1/8/Q2PP3/2P5/PP1B2PP/5RK1 b - - 2 23", "prompt": "Starting FEN: 1r2r2k/p1p1nRbp/B2q2p1/8/Q2PP3/2P5/PP1B2PP/5RK1 b - - 2 23\nMove: d6d5\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 2\nFullmove number: 23\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 6 B2q2p1->B5p1; rank 5 8->3q4.\nResult FEN: 1r2r2k/p1p1nRbp/B5p1/3q4/Q2PP3/2P5/PP1B2PP/5RK1 w - - 3 24", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "d6d5", "_fen_row_application_rank_rewrites": [{"rank": "6", "before": "B2q2p1", "after": "B5p1"}, {"rank": "5", "before": "8", "after": "3q4"}], "diagnostic": true, "hard_gate": false, "move": "d6d5", "rank_rewrites": [{"rank": "6", "before": "B2q2p1", "after": "B5p1"}, {"rank": "5", "before": "8", "after": "3q4"}]}} {"example_id": "perception_00203", "split": "perception", "task_type": "state_tracking", "fen": "rnbqk1nr/ppp3pp/3bp3/3pNp2/3P1B2/8/PPP1PPPP/RN1QKB1R w KQkq -", "prompt": "Starting FEN: rnbqk1nr/ppp3pp/3bp3/3pNp2/3P1B2/8/PPP1PPPP/RN1QKB1R w KQkq - 0 1\nAfter the moves d1d2, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rnbqk1nr/ppp3pp/3bp3/3pNp2/3P1B2/8/PPPQPPPP/RN2KB1R b KQkq - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "d1d2", "_state_tracking_result": "rnbqk1nr/ppp3pp/3bp3/3pNp2/3P1B2/8/PPPQPPPP/RN2KB1R b KQkq - 1 1"}} {"example_id": "perception_00204", "split": "perception", "task_type": "material_inventory", "fen": "8/8/5K2/4q3/4k3/8/8/8 w - - 7 67", "prompt": "FEN: 8/8/5K2/4q3/4k3/8/8/8 w - - 7 67\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=f6; queen=none; rook=none; bishop=none; knight=none; pawn=none.\nBlack inventory: king=e4; queen=e5; rook=none; bishop=none; knight=none; pawn=none.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00205", "split": "perception", "task_type": "material_piece_counts", "fen": "6k1/7p/6pP/1p4K1/1P3P2/P1B5/2b5/8 w - -", "prompt": "FEN: 6k1/7p/6pP/1p4K1/1P3P2/P1B5/2b5/8 w - -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=0; bishop=1; knight=0; pawn=4.\nBlack counts: king=1; queen=0; rook=0; bishop=1; knight=0; pawn=3.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00206", "split": "perception", "task_type": "material_value_totals", "fen": "2kr1b1r/ppp3p1/2n1ppp1/3q4/3P1P2/2P1BN1P/PP4P1/R2Q1RK1 w - - 0 14", "prompt": "FEN: 2kr1b1r/ppp3p1/2n1ppp1/3q4/3P1P2/2P1BN1P/PP4P1/R2Q1RK1 w - - 0 14\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=3; knight=3; pawn=7; total=32.\nBlack values: king=0; queen=9; rook=10; bishop=3; knight=3; pawn=7; total=32.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00207", "split": "perception", "task_type": "material_balance_trace", "fen": "8/8/3R4/1K6/8/2k5/8/8 b - -", "prompt": "FEN: 8/8/3R4/1K6/8/2k5/8/8 b - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=b5; queen=none; rook=d6; bishop=none; knight=none; pawn=none | black king=c3; queen=none; rook=none; bishop=none; knight=none; pawn=none\nCounts: white king=1; queen=0; rook=1; bishop=0; knight=0; pawn=0 | black king=1; queen=0; rook=0; bishop=0; knight=0; pawn=0\nValues: white total=5; black total=0\nBalance: White is up 5 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00208", "split": "perception", "task_type": "multi_state_tracking", "fen": "8/pp6/5p1p/8/5NP1/k7/P4b1P/1K6 w - -", "prompt": "Starting FEN: 8/pp6/5p1p/8/5NP1/k7/P4b1P/1K6 w - - 0 1\nAfter the moves f4d5 f2e1 d5f6, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 8/pp6/5N1p/8/6P1/k7/P6P/1K2b3 b - - 0 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "f4d5 f2e1 d5f6", "_multi_state_tracking_result": "8/pp6/5N1p/8/6P1/k7/P6P/1K2b3 b - - 0 2", "diagnostic": true, "hard_gate": false, "moves": "f4d5 f2e1 d5f6"}} {"example_id": "perception_00209", "split": "perception", "task_type": "board_print", "fen": "8/p5p1/1pp2p1p/3k4/P2PN1P1/6PP/1P3K2/8 w - - 1 33", "prompt": "Position (FEN): 8/p5p1/1pp2p1p/3k4/P2PN1P1/6PP/1P3K2/8 w - - 1 33\nShow me the board.", "gold_answer": "8 . . . . . . . .\n7 p . . . . . p .\n6 . p p . . p . p\n5 . . . k . . . .\n4 P . . P N . P .\n3 . . . . . . P P\n2 . P . . . K . .\n1 . . . . . . . .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00210", "split": "perception", "task_type": "board_to_fen", "fen": "R7/8/1B2k1pp/5p2/2p2K1P/8/8/8 w - - 1 53", "prompt": "Here is the current board:\n8 R . . . . . . .\n7 . . . . . . . .\n6 . B . . k . p p\n5 . . . . . p . .\n4 . . p . . K . P\n3 . . . . . . . .\n2 . . . . . . . .\n1 . . . . . . . .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 53\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "R7/8/1B2k1pp/5p2/2p2K1P/8/8/8 w - - 1 53", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00211", "split": "perception", "task_type": "piece_id", "fen": "8/2R5/6k1/4rp1p/8/7P/5PP1/5K2 b - - 1 46", "prompt": "FEN: 8/2R5/6k1/4rp1p/8/7P/5PP1/5K2 b - - 1 46\nWhat piece is on g6?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black king", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "g6"}} {"example_id": "perception_00212", "split": "perception", "task_type": "material_count", "fen": "8/pp4k1/2p1b1p1/4p3/5r2/2P2B1R/PP3P2/2K5 w - - 3 31", "prompt": "FEN: 8/pp4k1/2p1b1p1/4p3/5r2/2P2B1R/PP3P2/2K5 w - - 3 31\nWhat is the material count for both sides?", "gold_answer": "White (7 pieces): 1 bishop, 1 king, 4 pawns, 1 rook. Black (8 pieces): 1 bishop, 1 king, 5 pawns, 1 rook. Black is up 1 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00213", "split": "perception", "task_type": "square_lookup", "fen": "4r3/kp3r2/p1pQNP2/P1RpB1P1/3P2P1/4KR1P/8/4q3 w - - 14 48", "prompt": "FEN: 4r3/kp3r2/p1pQNP2/P1RpB1P1/3P2P1/4KR1P/8/4q3 w - - 14 48\nWhat is on f6?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "f6=white pawn", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "f6", "diagnostic": true, "hard_gate": false, "square": "f6"}} {"example_id": "perception_00214", "split": "perception", "task_type": "rank_lookup", "fen": "r3k1nr/pp1bn1bp/q2p1pp1/2pPp3/P1P1P3/1PN2N1P/3B1PP1/1R1QKB1R b Kkq - 0 17", "prompt": "FEN: r3k1nr/pp1bn1bp/q2p1pp1/2pPp3/P1P1P3/1PN2N1P/3B1PP1/1R1QKB1R b Kkq - 0 17\nWhat is the compressed FEN row for rank 7?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 7: pp1bn1bp", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "7", "_rank_lookup_row": "pp1bn1bp", "diagnostic": true, "hard_gate": false, "rank": "7", "fen_rank_row": "pp1bn1bp"}} {"example_id": "perception_00215", "split": "perception", "task_type": "square_coordinates", "fen": "1r1r2k1/4bppp/8/pP2P3/3p1P2/7P/2P3P1/R1K4R b - - 0 25", "prompt": "FEN: 1r1r2k1/4bppp/8/pP2P3/3p1P2/7P/2P3P1/R1K4R b - - 0 25\nFor square c2, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "c2: file=c; rank=2; fen_row_from_top=7; file_index=3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "c2", "diagnostic": true, "hard_gate": false, "square": "c2"}} {"example_id": "perception_00216", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r1bq1rk1/2p1npp1/pbnp3p/1p5Q/3PP3/1B3N2/PP3PPP/RNB2RK1 b - - 1 12", "prompt": "FEN: r1bq1rk1/2p1npp1/pbnp3p/1p5Q/3PP3/1B3N2/PP3PPP/RNB2RK1 b - - 1 12\nCompressed rank 7 row: 2p1npp1\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 7: a=1; b=1; c=p; d=1; e=n; f=p; g=p; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "7", "_fen_rank_expansion_row": "2p1npp1", "diagnostic": true, "hard_gate": false, "rank": "7", "fen_rank_row": "2p1npp1"}} {"example_id": "perception_00217", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "3r1rk1/ppp3bp/6p1/2pPp3/2P3Q1/2N5/PP3qPN/3RR2K b - - 1 21", "prompt": "Rank 4 row before: 2P3Q1\nFile f changes from 1 to q. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 4: 2P3Q1 -> 2P2qQ1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "f2f4", "_fen_rank_cell_edit_square": "f4", "_fen_rank_cell_edit_rank": "4", "_fen_rank_cell_edit_file": "f", "_fen_rank_cell_edit_before_row": "2P3Q1", "_fen_rank_cell_edit_after_row": "2P2qQ1", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "q", "diagnostic": true, "hard_gate": false, "move": "f2f4", "square": "f4", "rank": "4", "file": "f", "before_row": "2P3Q1", "after_row": "2P2qQ1", "before_fen": "1", "after_fen": "q"}} {"example_id": "perception_00218", "split": "perception", "task_type": "fen_board_edit", "fen": "8/1kp4p/1p4p1/p3Pp2/2r1bB2/PK6/2P4P/4R3 b - - 1 32", "prompt": "Board FEN before: 8/1kp4p/1p4p1/p3Pp2/2r1bB2/PK6/2P4P/4R3\nApply square edits: c4 r->1; c6 1->r\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 8/1kp4p/1pr3p1/p3Pp2/4bB2/PK6/2P4P/4R3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "c4c6", "_fen_board_edit_board_fen_before": "8/1kp4p/1p4p1/p3Pp2/2r1bB2/PK6/2P4P/4R3", "_fen_board_edit_board_fen_after": "8/1kp4p/1pr3p1/p3Pp2/4bB2/PK6/2P4P/4R3", "_fen_board_edit_edit_text": "c4 r->1; c6 1->r", "_fen_board_edit_changed_squares": [{"square": "c4", "before": "black rook", "after": "empty", "before_fen": "r", "after_fen": "1"}, {"square": "c6", "before": "empty", "after": "black rook", "before_fen": "1", "after_fen": "r"}], "diagnostic": true, "hard_gate": false, "move": "c4c6", "board_fen_before": "8/1kp4p/1p4p1/p3Pp2/2r1bB2/PK6/2P4P/4R3", "board_fen_after": "8/1kp4p/1pr3p1/p3Pp2/4bB2/PK6/2P4P/4R3", "edit_text": "c4 r->1; c6 1->r", "changed_squares": [{"square": "c4", "before": "black rook", "after": "empty", "before_fen": "r", "after_fen": "1"}, {"square": "c6", "before": "empty", "after": "black rook", "before_fen": "1", "after_fen": "r"}]}} {"example_id": "perception_00219", "split": "perception", "task_type": "move_square_edits", "fen": "2k2b2/p5p1/1pp1q1pp/3PPn2/N2P4/1P1QB2P/P5P1/6K1 b - - 0 26", "prompt": "Starting FEN: 2k2b2/p5p1/1pp1q1pp/3PPn2/N2P4/1P1QB2P/P5P1/6K1 b - - 0 26\nMove: c6c5\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: c6=black pawn; c5=empty.\nSquares: c6 black pawn->empty; c5 empty->black pawn.\nRanks: rank 6 c p->1; rank 5 c 1->p.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "c6c5", "diagnostic": true, "hard_gate": false, "move": "c6c5"}} {"example_id": "perception_00220", "split": "perception", "task_type": "fen_assembly", "fen": "4k2r/4bppp/8/3p4/1B6/3n1N2/5PPP/1R4K1 w k - 0 26", "prompt": "Starting FEN: 4k2r/4bppp/8/3p4/1B6/3n1N2/5PPP/1R4K1 w k - 0 26\nMove: h2h3\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: k\nEn passant: none\nHalfmove clock: 0\nFullmove number: 26\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white pawn h2h3.\nLookup: h2=white pawn; h3=empty.\nSquares: h2 white pawn->empty; h3 empty->white pawn.\nRanks: rank 2 h P->1; rank 3 h 1->P.\nResult FEN: 4k2r/4bppp/8/3p4/1B6/3n1N1P/5PP1/1R4K1 b k - 0 26", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "h2h3", "diagnostic": true, "hard_gate": false, "move": "h2h3"}} {"example_id": "perception_00221", "split": "perception", "task_type": "fen_row_application", "fen": "r4rk1/4q2p/pn1p2p1/2pPp3/Pp2P3/1B2Q1Nn/1PP2PK1/2R2R2 b - - 1 22", "prompt": "Starting FEN: r4rk1/4q2p/pn1p2p1/2pPp3/Pp2P3/1B2Q1Nn/1PP2PK1/2R2R2 b - - 1 22\nMove: f8e8\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 22\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 8 r4rk1->r3r1k1.\nResult FEN: r3r1k1/4q2p/pn1p2p1/2pPp3/Pp2P3/1B2Q1Nn/1PP2PK1/2R2R2 w - - 2 23", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "f8e8", "_fen_row_application_rank_rewrites": [{"rank": "8", "before": "r4rk1", "after": "r3r1k1"}], "diagnostic": true, "hard_gate": false, "move": "f8e8", "rank_rewrites": [{"rank": "8", "before": "r4rk1", "after": "r3r1k1"}]}} {"example_id": "perception_00222", "split": "perception", "task_type": "state_tracking", "fen": "rnbq1rk1/ppp2pbp/5np1/4p1B1/4P3/2P5/PP1N1PPP/R2QKBNR w KQ -", "prompt": "Starting FEN: rnbq1rk1/ppp2pbp/5np1/4p1B1/4P3/2P5/PP1N1PPP/R2QKBNR w KQ - 0 1\nAfter the moves g5f4, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rnbq1rk1/ppp2pbp/5np1/4p3/4PB2/2P5/PP1N1PPP/R2QKBNR b KQ - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "g5f4", "_state_tracking_result": "rnbq1rk1/ppp2pbp/5np1/4p3/4PB2/2P5/PP1N1PPP/R2QKBNR b KQ - 1 1"}} {"example_id": "perception_00223", "split": "perception", "task_type": "material_inventory", "fen": "r1b3k1/pp5p/3ppqp1/4n3/2P1P3/8/P3B1PP/1R1Q2K1 w - - 0 20", "prompt": "FEN: r1b3k1/pp5p/3ppqp1/4n3/2P1P3/8/P3B1PP/1R1Q2K1 w - - 0 20\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=d1; rook=b1; bishop=e2; knight=none; pawn=a2,g2,h2,c4,e4.\nBlack inventory: king=g8; queen=f6; rook=a8; bishop=c8; knight=e5; pawn=d6,e6,g6,a7,b7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00224", "split": "perception", "task_type": "material_piece_counts", "fen": "rnbqkbnr/pp1ppppp/8/2p1P3/8/8/PPPP1PPP/RNBQKBNR w KQkq - 0 3", "prompt": "FEN: rnbqkbnr/pp1ppppp/8/2p1P3/8/8/PPPP1PPP/RNBQKBNR w KQkq - 0 3\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=8.\nBlack counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=8.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00225", "split": "perception", "task_type": "material_value_totals", "fen": "r2qk2r/ppp2ppp/2n1pn2/8/1bBP4/2N1BP2/PP3PPP/R2Q1RK1 w kq - 4 9", "prompt": "FEN: r2qk2r/ppp2ppp/2n1pn2/8/1bBP4/2N1BP2/PP3PPP/R2Q1RK1 w kq - 4 9\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=6; knight=3; pawn=7; total=35.\nBlack values: king=0; queen=9; rook=10; bishop=3; knight=6; pawn=7; total=35.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00226", "split": "perception", "task_type": "material_balance_trace", "fen": "r1b1kbnr/ppp1pppp/2n5/q2P4/8/2N5/PP2PPPP/R1BQKBNR b KQkq - 0 5", "prompt": "FEN: r1b1kbnr/ppp1pppp/2n5/q2P4/8/2N5/PP2PPPP/R1BQKBNR b KQkq - 0 5\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=e1; queen=d1; rook=a1,h1; bishop=c1,f1; knight=g1,c3; pawn=a2,b2,e2,f2,g2,h2,d5 | black king=e8; queen=a5; rook=a8,h8; bishop=c8,f8; knight=c6,g8; pawn=a7,b7,c7,e7,f7,g7,h7\nCounts: white king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7 | black king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7\nValues: white total=38; black total=38\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00227", "split": "perception", "task_type": "multi_state_tracking", "fen": "r1b1r2k/pp1nnQp1/4p3/3pP1N1/1b1q1P2/2N2R2/PP4PP/R1B3K1 w - -", "prompt": "Starting FEN: r1b1r2k/pp1nnQp1/4p3/3pP1N1/1b1q1P2/2N2R2/PP4PP/R1B3K1 w - - 0 1\nAfter the moves f3e3 e7c6 g5f3, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r1b1r2k/pp1n1Qp1/2n1p3/3pP3/1b1q1P2/2N1RN2/PP4PP/R1B3K1 b - - 3 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "f3e3 e7c6 g5f3", "_multi_state_tracking_result": "r1b1r2k/pp1n1Qp1/2n1p3/3pP3/1b1q1P2/2N1RN2/PP4PP/R1B3K1 b - - 3 2", "diagnostic": true, "hard_gate": false, "moves": "f3e3 e7c6 g5f3"}} {"example_id": "perception_00228", "split": "perception", "task_type": "board_print", "fen": "r1b1k2r/pp2bppp/1q3n2/2pp2B1/8/2PBPN2/PPQ2PPP/R3K2R b KQkq -", "prompt": "Position (FEN): r1b1k2r/pp2bppp/1q3n2/2pp2B1/8/2PBPN2/PPQ2PPP/R3K2R b KQkq -\nShow me the board.", "gold_answer": "8 r . b . k . . r\n7 p p . . b p p p\n6 . q . . . n . .\n5 . . p p . . B .\n4 . . . . . . . .\n3 . . P B P N . .\n2 P P Q . . P P P\n1 R . . . K . . R\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00229", "split": "perception", "task_type": "board_to_fen", "fen": "2r1kbnr/p2npp2/1p5p/8/3P1B2/2K2NP1/PP3P1P/1R3B1R w k - 1 17", "prompt": "Here is the current board:\n8 . . r . k b n r\n7 p . . n p p . .\n6 . p . . . . . p\n5 . . . . . . . .\n4 . . . P . B . .\n3 . . K . . N P .\n2 P P . . . P . P\n1 . R . . . B . R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: k\nEn passant: none\nHalfmove clock: 1\nFullmove number: 17\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "2r1kbnr/p2npp2/1p5p/8/3P1B2/2K2NP1/PP3P1P/1R3B1R w k - 1 17", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00230", "split": "perception", "task_type": "piece_id", "fen": "2kr1b1r/pppbqppp/2n2n2/8/3p4/3P1NP1/PP2PPBP/RNBQ1RK1 w - - 5 10", "prompt": "FEN: 2kr1b1r/pppbqppp/2n2n2/8/3p4/3P1NP1/PP2PPBP/RNBQ1RK1 w - - 5 10\nWhat piece is on a2?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "a2"}} {"example_id": "perception_00231", "split": "perception", "task_type": "material_count", "fen": "6k1/5p1p/6p1/4N3/8/8/3K1PPP/8 b - - 1 36", "prompt": "FEN: 6k1/5p1p/6p1/4N3/8/8/3K1PPP/8 b - - 1 36\nWhat is the material count for both sides?", "gold_answer": "White (5 pieces): 1 king, 1 knight, 3 pawns. Black (4 pieces): 1 king, 3 pawns. White is up 3 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00232", "split": "perception", "task_type": "square_lookup", "fen": "r3k2r/1p2bppp/p7/2p1N3/P3P3/5K2/1P3PPP/2RR4 b kq - 2 20", "prompt": "FEN: r3k2r/1p2bppp/p7/2p1N3/P3P3/5K2/1P3PPP/2RR4 b kq - 2 20\nWhat is on f7?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "f7=black pawn", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "f7", "diagnostic": true, "hard_gate": false, "square": "f7"}} {"example_id": "perception_00233", "split": "perception", "task_type": "rank_lookup", "fen": "3r1r1k/p2q3p/1pp2b2/5p2/1PPP1p2/PNN2Q2/B4P2/5KR1 w - - 4 33", "prompt": "FEN: 3r1r1k/p2q3p/1pp2b2/5p2/1PPP1p2/PNN2Q2/B4P2/5KR1 w - - 4 33\nWhat is the compressed FEN row for rank 3?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 3: PNN2Q2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "3", "_rank_lookup_row": "PNN2Q2", "diagnostic": true, "hard_gate": false, "rank": "3", "fen_rank_row": "PNN2Q2"}} {"example_id": "perception_00234", "split": "perception", "task_type": "square_coordinates", "fen": "3r1r2/pQ2kpp1/2B4p/q1b1p3/4p1PP/4B3/PPP2P2/2K3R1 b - -", "prompt": "FEN: 3r1r2/pQ2kpp1/2B4p/q1b1p3/4p1PP/4B3/PPP2P2/2K3R1 b - -\nFor square g4, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "g4: file=g; rank=4; fen_row_from_top=5; file_index=7", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "g4", "diagnostic": true, "hard_gate": false, "square": "g4"}} {"example_id": "perception_00235", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r2q1rk1/pp2p1b1/3p2pp/5b1n/3B4/2P5/PP2BPPP/RN1QR1K1 b - - 0 14", "prompt": "FEN: r2q1rk1/pp2p1b1/3p2pp/5b1n/3B4/2P5/PP2BPPP/RN1QR1K1 b - - 0 14\nCompressed rank 8 row: r2q1rk1\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 8: a=r; b=1; c=1; d=q; e=1; f=r; g=k; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "8", "_fen_rank_expansion_row": "r2q1rk1", "diagnostic": true, "hard_gate": false, "rank": "8", "fen_rank_row": "r2q1rk1"}} {"example_id": "perception_00236", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r5rk/pp1qb2p/2p2n2/3p1P2/3Pp3/2P1B2Q/PP2B2P/5RRK b - - 2 20", "prompt": "Rank 8 row before: r5rk\nFile a changes from r to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 8: r5rk -> 2r3rk", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "a8c8", "_fen_rank_cell_edit_square": "a8", "_fen_rank_cell_edit_rank": "8", "_fen_rank_cell_edit_file": "a", "_fen_rank_cell_edit_before_row": "r5rk", "_fen_rank_cell_edit_after_row": "2r3rk", "_fen_rank_cell_edit_before_fen": "r", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "a8c8", "square": "a8", "rank": "8", "file": "a", "before_row": "r5rk", "after_row": "2r3rk", "before_fen": "r", "after_fen": "1"}} {"example_id": "perception_00237", "split": "perception", "task_type": "fen_board_edit", "fen": "8/8/7p/1p4p1/1P3p2/P1k1N2P/1b4P1/5K2 w - - 0 49", "prompt": "Board FEN before: 8/8/7p/1p4p1/1P3p2/P1k1N2P/1b4P1/5K2\nApply square edits: f1 K->1; e2 1->K\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 8/8/7p/1p4p1/1P3p2/P1k1N2P/1b2K1P1/8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "f1e2", "_fen_board_edit_board_fen_before": "8/8/7p/1p4p1/1P3p2/P1k1N2P/1b4P1/5K2", "_fen_board_edit_board_fen_after": "8/8/7p/1p4p1/1P3p2/P1k1N2P/1b2K1P1/8", "_fen_board_edit_edit_text": "f1 K->1; e2 1->K", "_fen_board_edit_changed_squares": [{"square": "f1", "before": "white king", "after": "empty", "before_fen": "K", "after_fen": "1"}, {"square": "e2", "before": "empty", "after": "white king", "before_fen": "1", "after_fen": "K"}], "diagnostic": true, "hard_gate": false, "move": "f1e2", "board_fen_before": "8/8/7p/1p4p1/1P3p2/P1k1N2P/1b4P1/5K2", "board_fen_after": "8/8/7p/1p4p1/1P3p2/P1k1N2P/1b2K1P1/8", "edit_text": "f1 K->1; e2 1->K", "changed_squares": [{"square": "f1", "before": "white king", "after": "empty", "before_fen": "K", "after_fen": "1"}, {"square": "e2", "before": "empty", "after": "white king", "before_fen": "1", "after_fen": "K"}]}} {"example_id": "perception_00238", "split": "perception", "task_type": "move_square_edits", "fen": "r1bq1rk1/p4p2/1p3R1p/6p1/4P3/1P1P4/PB2B1PP/R4QK1 w - - 0 19", "prompt": "Starting FEN: r1bq1rk1/p4p2/1p3R1p/6p1/4P3/1P1P4/PB2B1PP/R4QK1 w - - 0 19\nMove: d3d4\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: d3=white pawn; d4=empty.\nSquares: d3 white pawn->empty; d4 empty->white pawn.\nRanks: rank 3 d P->1; rank 4 d 1->P.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "d3d4", "diagnostic": true, "hard_gate": false, "move": "d3d4"}} {"example_id": "perception_00239", "split": "perception", "task_type": "fen_assembly", "fen": "r2q4/pp1kb2Q/2n1p1r1/3pPpN1/8/2P5/PP3PPP/R1B1R1K1 b - -", "prompt": "Starting FEN: r2q4/pp1kb2Q/2n1p1r1/3pPpN1/8/2P5/PP3PPP/R1B1R1K1 b - - 0 1\nMove: d8e8\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black queen d8e8.\nLookup: d8=black queen; e8=empty.\nSquares: d8 black queen->empty; e8 empty->black queen.\nRanks: rank 8 d q->1; rank 8 e 1->q.\nResult FEN: r3q3/pp1kb2Q/2n1p1r1/3pPpN1/8/2P5/PP3PPP/R1B1R1K1 w - - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "d8e8", "diagnostic": true, "hard_gate": false, "move": "d8e8"}} {"example_id": "perception_00240", "split": "perception", "task_type": "fen_row_application", "fen": "4rrk1/pp3ppp/8/2p5/2PpP3/1P1B2Qq/P4P2/4RRK1 b - - 1 23", "prompt": "Starting FEN: 4rrk1/pp3ppp/8/2p5/2PpP3/1P1B2Qq/P4P2/4RRK1 b - - 1 23\nMove: e8b8\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 23\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 8 4rrk1->1r3rk1.\nResult FEN: 1r3rk1/pp3ppp/8/2p5/2PpP3/1P1B2Qq/P4P2/4RRK1 w - - 2 24", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "e8b8", "_fen_row_application_rank_rewrites": [{"rank": "8", "before": "4rrk1", "after": "1r3rk1"}], "diagnostic": true, "hard_gate": false, "move": "e8b8", "rank_rewrites": [{"rank": "8", "before": "4rrk1", "after": "1r3rk1"}]}} {"example_id": "perception_00241", "split": "perception", "task_type": "state_tracking", "fen": "rn1qk2r/pbpp1ppp/1p2p3/3PP3/1bP1n3/2N5/PP3PPP/R1BQKBNR w KQkq -", "prompt": "Starting FEN: rn1qk2r/pbpp1ppp/1p2p3/3PP3/1bP1n3/2N5/PP3PPP/R1BQKBNR w KQkq - 0 1\nAfter the moves e1e2, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rn1qk2r/pbpp1ppp/1p2p3/3PP3/1bP1n3/2N5/PP2KPPP/R1BQ1BNR b kq - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "e1e2", "_state_tracking_result": "rn1qk2r/pbpp1ppp/1p2p3/3PP3/1bP1n3/2N5/PP2KPPP/R1BQ1BNR b kq - 1 1"}} {"example_id": "perception_00242", "split": "perception", "task_type": "material_inventory", "fen": "r1bq1rk1/1p3ppp/p1n2n2/2b2P2/4p3/3BPQ2/PPPB2PP/2KR2NR w - - 0 12", "prompt": "FEN: r1bq1rk1/1p3ppp/p1n2n2/2b2P2/4p3/3BPQ2/PPPB2PP/2KR2NR w - - 0 12\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=c1; queen=f3; rook=d1,h1; bishop=d2,d3; knight=g1; pawn=a2,b2,c2,g2,h2,e3,f5.\nBlack inventory: king=g8; queen=d8; rook=a8,f8; bishop=c5,c8; knight=c6,f6; pawn=e4,a6,b7,f7,g7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00243", "split": "perception", "task_type": "material_piece_counts", "fen": "r1bqk2r/pppp1ppp/3b1n2/4P3/4P3/P1N5/1PP2PPP/R1BQKB1R b KQkq -", "prompt": "FEN: r1bqk2r/pppp1ppp/3b1n2/4P3/4P3/P1N5/1PP2PPP/R1BQKB1R b KQkq -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=2; knight=1; pawn=8.\nBlack counts: king=1; queen=1; rook=2; bishop=2; knight=1; pawn=7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00244", "split": "perception", "task_type": "material_value_totals", "fen": "r1b5/1p3k2/p4pp1/2Pp3p/7P/1P5N/2n2PP1/RN4K1 w - -", "prompt": "FEN: r1b5/1p3k2/p4pp1/2Pp3p/7P/1P5N/2n2PP1/RN4K1 w - -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=5; bishop=0; knight=6; pawn=5; total=16.\nBlack values: king=0; queen=0; rook=5; bishop=3; knight=3; pawn=6; total=17.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00245", "split": "perception", "task_type": "material_balance_trace", "fen": "rnb1k2r/pp3ppp/3p4/q3p3/2B5/2n1PN2/PPP3PP/R2Q1RK1 w kq - 0 10", "prompt": "FEN: rnb1k2r/pp3ppp/3p4/q3p3/2B5/2n1PN2/PPP3PP/R2Q1RK1 w kq - 0 10\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=d1; rook=a1,f1; bishop=c4; knight=f3; pawn=a2,b2,c2,g2,h2,e3 | black king=e8; queen=a5; rook=a8,h8; bishop=c8; knight=c3,b8; pawn=e5,d6,a7,b7,f7,g7,h7\nCounts: white king=1; queen=1; rook=2; bishop=1; knight=1; pawn=6 | black king=1; queen=1; rook=2; bishop=1; knight=2; pawn=7\nValues: white total=31; black total=35\nBalance: Black is up 4 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00246", "split": "perception", "task_type": "multi_state_tracking", "fen": "1k4rr/1bq2pp1/pp6/2bPpP1n/2p1P1Qp/2P5/PBB2NPP/4RRK1 w - -", "prompt": "Starting FEN: 1k4rr/1bq2pp1/pp6/2bPpP1n/2p1P1Qp/2P5/PBB2NPP/4RRK1 w - - 0 1\nAfter the moves g4d1 c5b4, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 1k4rr/1bq2pp1/pp6/3PpP1n/1bp1P2p/2P5/PBB2NPP/3QRRK1 w - - 2 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "g4d1 c5b4", "_multi_state_tracking_result": "1k4rr/1bq2pp1/pp6/3PpP1n/1bp1P2p/2P5/PBB2NPP/3QRRK1 w - - 2 2", "diagnostic": true, "hard_gate": false, "moves": "g4d1 c5b4"}} {"example_id": "perception_00247", "split": "perception", "task_type": "board_print", "fen": "2r5/4P3/8/3P1p2/5Pp1/P2KP3/6k1/7R b - - 0 60", "prompt": "Position (FEN): 2r5/4P3/8/3P1p2/5Pp1/P2KP3/6k1/7R b - - 0 60\nShow me the board.", "gold_answer": "8 . . r . . . . .\n7 . . . . P . . .\n6 . . . . . . . .\n5 . . . P . p . .\n4 . . . . . P p .\n3 P . . K P . . .\n2 . . . . . . k .\n1 . . . . . . . R\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00248", "split": "perception", "task_type": "board_to_fen", "fen": "r1bqk1nr/pp1ppp1p/2N3p1/8/4P3/8/PPPb1PPP/R2QKB1R w KQkq - 0 8", "prompt": "Here is the current board:\n8 r . b q k . n r\n7 p p . p p p . p\n6 . . N . . . p .\n5 . . . . . . . .\n4 . . . . P . . .\n3 . . . . . . . .\n2 P P P b . P P P\n1 R . . Q K B . R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 8\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r1bqk1nr/pp1ppp1p/2N3p1/8/4P3/8/PPPb1PPP/R2QKB1R w KQkq - 0 8", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00249", "split": "perception", "task_type": "piece_id", "fen": "2b1r3/3knQ2/p1p1B3/2P3B1/4P2P/3P1Pq1/6P1/5RK1 b - - 0 30", "prompt": "FEN: 2b1r3/3knQ2/p1p1B3/2P3B1/4P2P/3P1Pq1/6P1/5RK1 b - - 0 30\nWhat piece is on f7?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white queen", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "f7"}} {"example_id": "perception_00250", "split": "perception", "task_type": "material_count", "fen": "rn2kb1r/ppp2p1p/3p1np1/4p3/2B1P3/2NP3P/PPP2PP1/R1B1K2R b KQkq - 0 8", "prompt": "FEN: rn2kb1r/ppp2p1p/3p1np1/4p3/2B1P3/2NP3P/PPP2PP1/R1B1K2R b KQkq - 0 8\nWhat is the material count for both sides?", "gold_answer": "White (14 pieces): 2 bishops, 1 king, 1 knight, 8 pawns, 2 rooks. Black (14 pieces): 1 bishop, 1 king, 2 knights, 8 pawns, 2 rooks. Material is equal.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00251", "split": "perception", "task_type": "square_lookup", "fen": "rn4k1/p4p1p/1pp3p1/6N1/3P2b1/1BPq4/P5PP/1R3K1R w - - 2 21", "prompt": "FEN: rn4k1/p4p1p/1pp3p1/6N1/3P2b1/1BPq4/P5PP/1R3K1R w - - 2 21\nWhat is on b6?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "b6=black pawn", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "b6", "diagnostic": true, "hard_gate": false, "square": "b6"}} {"example_id": "perception_00252", "split": "perception", "task_type": "rank_lookup", "fen": "8/p7/P7/5k2/5p1p/7P/5K2/8 w - - 3 47", "prompt": "FEN: 8/p7/P7/5k2/5p1p/7P/5K2/8 w - - 3 47\nWhat is the compressed FEN row for rank 1?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 1: 8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "1", "_rank_lookup_row": "8", "diagnostic": true, "hard_gate": false, "rank": "1", "fen_rank_row": "8"}} {"example_id": "perception_00253", "split": "perception", "task_type": "square_coordinates", "fen": "8/8/7p/6q1/8/3K4/7k/8 b - - 3 68", "prompt": "FEN: 8/8/7p/6q1/8/3K4/7k/8 b - - 3 68\nFor square h2, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "h2: file=h; rank=2; fen_row_from_top=7; file_index=8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "h2", "diagnostic": true, "hard_gate": false, "square": "h2"}} {"example_id": "perception_00254", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r1bqk2r/pp3pp1/2nb1n2/2p3p1/2Pp4/1P1P3P/PB2BP2/RN1QK1NR w KQkq - 0 11", "prompt": "FEN: r1bqk2r/pp3pp1/2nb1n2/2p3p1/2Pp4/1P1P3P/PB2BP2/RN1QK1NR w KQkq - 0 11\nCompressed rank 7 row: pp3pp1\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 7: a=p; b=p; c=1; d=1; e=1; f=p; g=p; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "7", "_fen_rank_expansion_row": "pp3pp1", "diagnostic": true, "hard_gate": false, "rank": "7", "fen_rank_row": "pp3pp1"}} {"example_id": "perception_00255", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "1r1q1rk1/4b1pn/p4p1p/2p1pP2/3pP1PP/Pn1P1N2/1PRB1QN1/1R4K1 w - - 4 29", "prompt": "Rank 5 row before: 2p1pP2\nFile a changes from 1 to B. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 5: 2p1pP2 -> B1p1pP2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "d2a5", "_fen_rank_cell_edit_square": "a5", "_fen_rank_cell_edit_rank": "5", "_fen_rank_cell_edit_file": "a", "_fen_rank_cell_edit_before_row": "2p1pP2", "_fen_rank_cell_edit_after_row": "B1p1pP2", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "B", "diagnostic": true, "hard_gate": false, "move": "d2a5", "square": "a5", "rank": "5", "file": "a", "before_row": "2p1pP2", "after_row": "B1p1pP2", "before_fen": "1", "after_fen": "B"}} {"example_id": "perception_00256", "split": "perception", "task_type": "fen_board_edit", "fen": "2rqkb1r/3b1ppp/p1n1p3/1p1pPn2/3P4/P1N1BN2/1PB2PPP/R2Q1RK1 b k - 3 14", "prompt": "Board FEN before: 2rqkb1r/3b1ppp/p1n1p3/1p1pPn2/3P4/P1N1BN2/1PB2PPP/R2Q1RK1\nApply square edits: c6 n->1; e7 1->n\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 2rqkb1r/3bnppp/p3p3/1p1pPn2/3P4/P1N1BN2/1PB2PPP/R2Q1RK1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "c6e7", "_fen_board_edit_board_fen_before": "2rqkb1r/3b1ppp/p1n1p3/1p1pPn2/3P4/P1N1BN2/1PB2PPP/R2Q1RK1", "_fen_board_edit_board_fen_after": "2rqkb1r/3bnppp/p3p3/1p1pPn2/3P4/P1N1BN2/1PB2PPP/R2Q1RK1", "_fen_board_edit_edit_text": "c6 n->1; e7 1->n", "_fen_board_edit_changed_squares": [{"square": "c6", "before": "black knight", "after": "empty", "before_fen": "n", "after_fen": "1"}, {"square": "e7", "before": "empty", "after": "black knight", "before_fen": "1", "after_fen": "n"}], "diagnostic": true, "hard_gate": false, "move": "c6e7", "board_fen_before": "2rqkb1r/3b1ppp/p1n1p3/1p1pPn2/3P4/P1N1BN2/1PB2PPP/R2Q1RK1", "board_fen_after": "2rqkb1r/3bnppp/p3p3/1p1pPn2/3P4/P1N1BN2/1PB2PPP/R2Q1RK1", "edit_text": "c6 n->1; e7 1->n", "changed_squares": [{"square": "c6", "before": "black knight", "after": "empty", "before_fen": "n", "after_fen": "1"}, {"square": "e7", "before": "empty", "after": "black knight", "before_fen": "1", "after_fen": "n"}]}} {"example_id": "perception_00257", "split": "perception", "task_type": "move_square_edits", "fen": "2b5/1p6/p4k2/2PB2pp/1P1K4/8/6PP/8 w - -", "prompt": "Starting FEN: 2b5/1p6/p4k2/2PB2pp/1P1K4/8/6PP/8 w - -\nMove: d4d3\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: d4=white king; d3=empty.\nSquares: d4 white king->empty; d3 empty->white king.\nRanks: rank 4 d K->1; rank 3 d 1->K.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "d4d3", "diagnostic": true, "hard_gate": false, "move": "d4d3"}} {"example_id": "perception_00258", "split": "perception", "task_type": "fen_assembly", "fen": "4k3/1N6/3K2p1/6N1/8/8/8/8 w - -", "prompt": "Starting FEN: 4k3/1N6/3K2p1/6N1/8/8/8/8 w - - 0 1\nMove: g5e6\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white knight g5e6.\nLookup: g5=white knight; e6=empty.\nSquares: g5 white knight->empty; e6 empty->white knight.\nRanks: rank 5 g N->1; rank 6 e 1->N.\nResult FEN: 4k3/1N6/3KN1p1/8/8/8/8/8 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "g5e6", "diagnostic": true, "hard_gate": false, "move": "g5e6"}} {"example_id": "perception_00259", "split": "perception", "task_type": "fen_row_application", "fen": "3rk2r/Qb1n1pp1/1p1p1q1p/1BbPp3/4P3/5N2/PP3PPP/RN3RK1 b k - 0 13", "prompt": "Starting FEN: 3rk2r/Qb1n1pp1/1p1p1q1p/1BbPp3/4P3/5N2/PP3PPP/RN3RK1 b k - 0 13\nMove: c5e3\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: k\nEn passant: none\nHalfmove clock: 0\nFullmove number: 13\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 5 1BbPp3->1B1Pp3; rank 3 5N2->4bN2.\nResult FEN: 3rk2r/Qb1n1pp1/1p1p1q1p/1B1Pp3/4P3/4bN2/PP3PPP/RN3RK1 w k - 1 14", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "c5e3", "_fen_row_application_rank_rewrites": [{"rank": "5", "before": "1BbPp3", "after": "1B1Pp3"}, {"rank": "3", "before": "5N2", "after": "4bN2"}], "diagnostic": true, "hard_gate": false, "move": "c5e3", "rank_rewrites": [{"rank": "5", "before": "1BbPp3", "after": "1B1Pp3"}, {"rank": "3", "before": "5N2", "after": "4bN2"}]}} {"example_id": "perception_00260", "split": "perception", "task_type": "state_tracking", "fen": "rnb2rk1/pp1pppbp/3n2p1/1q6/3P1B2/P4N2/4BPPP/2RQ1K1R w - -", "prompt": "Starting FEN: rnb2rk1/pp1pppbp/3n2p1/1q6/3P1B2/P4N2/4BPPP/2RQ1K1R w - - 0 1\nAfter the moves f3h4, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rnb2rk1/pp1pppbp/3n2p1/1q6/3P1B1N/P7/4BPPP/2RQ1K1R b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "f3h4", "_state_tracking_result": "rnb2rk1/pp1pppbp/3n2p1/1q6/3P1B1N/P7/4BPPP/2RQ1K1R b - - 1 1"}} {"example_id": "perception_00261", "split": "perception", "task_type": "material_inventory", "fen": "r1b2rk1/pppp1ppp/1bn3n1/4P1Pq/4Q2P/2N1PN2/PPPB1P2/R3KB1R w KQ -", "prompt": "FEN: r1b2rk1/pppp1ppp/1bn3n1/4P1Pq/4Q2P/2N1PN2/PPPB1P2/R3KB1R w KQ -\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=e1; queen=e4; rook=a1,h1; bishop=f1,d2; knight=c3,f3; pawn=a2,b2,c2,f2,e3,h4,e5,g5.\nBlack inventory: king=g8; queen=h5; rook=a8,f8; bishop=b6,c8; knight=c6,g6; pawn=a7,b7,c7,d7,f7,g7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00262", "split": "perception", "task_type": "material_piece_counts", "fen": "r1bqkb1r/4p2p/p1p2p2/3p1np1/3P4/4PNB1/PP3PPP/RN1Q1RK1 w kq -", "prompt": "FEN: r1bqkb1r/4p2p/p1p2p2/3p1np1/3P4/4PNB1/PP3PPP/RN1Q1RK1 w kq -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=1; knight=2; pawn=7.\nBlack counts: king=1; queen=1; rook=2; bishop=2; knight=1; pawn=7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00263", "split": "perception", "task_type": "material_value_totals", "fen": "1k6/4Q3/8/2N5/3K4/8/8/8 w - -", "prompt": "FEN: 1k6/4Q3/8/2N5/3K4/8/8/8 w - -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=0; bishop=0; knight=3; pawn=0; total=12.\nBlack values: king=0; queen=0; rook=0; bishop=0; knight=0; pawn=0; total=0.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00264", "split": "perception", "task_type": "material_balance_trace", "fen": "3q1r1k/r1n1bppp/4p3/pb1pP3/1p1P2Q1/1P1BB1P1/P1R2P1P/1NR3K1 w - -", "prompt": "FEN: 3q1r1k/r1n1bppp/4p3/pb1pP3/1p1P2Q1/1P1BB1P1/P1R2P1P/1NR3K1 w - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=g4; rook=c1,c2; bishop=d3,e3; knight=b1; pawn=a2,f2,h2,b3,g3,d4,e5 | black king=h8; queen=d8; rook=a7,f8; bishop=b5,e7; knight=c7; pawn=b4,a5,d5,e6,f7,g7,h7\nCounts: white king=1; queen=1; rook=2; bishop=2; knight=1; pawn=7 | black king=1; queen=1; rook=2; bishop=2; knight=1; pawn=7\nValues: white total=35; black total=35\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00265", "split": "perception", "task_type": "multi_state_tracking", "fen": "r3kb1r/pppn1ppp/8/1q2p1P1/4p3/P3P2P/3B1P2/Q3K2R w kq - 1 16", "prompt": "Starting FEN: r3kb1r/pppn1ppp/8/1q2p1P1/4p3/P3P2P/3B1P2/Q3K2R w kq - 1 16\nAfter the moves a1d4 d7b6, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: kq\nEn passant: none\nHalfmove clock: 1\nFullmove number: 16\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r3kb1r/ppp2ppp/1n6/1q2p1P1/3Qp3/P3P2P/3B1P2/4K2R w kq - 3 17", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "a1d4 d7b6", "_multi_state_tracking_result": "r3kb1r/ppp2ppp/1n6/1q2p1P1/3Qp3/P3P2P/3B1P2/4K2R w kq - 3 17", "diagnostic": true, "hard_gate": false, "moves": "a1d4 d7b6"}} {"example_id": "perception_00266", "split": "perception", "task_type": "board_print", "fen": "rnb1r1k1/ppb2pp1/2pq1n2/3p4/1P1P2Pp/P1N1PP2/4N1BP/R1BQ1RK1 w - -", "prompt": "Position (FEN): rnb1r1k1/ppb2pp1/2pq1n2/3p4/1P1P2Pp/P1N1PP2/4N1BP/R1BQ1RK1 w - -\nShow me the board.", "gold_answer": "8 r n b . r . k .\n7 p p b . . p p .\n6 . . p q . n . .\n5 . . . p . . . .\n4 . P . P . . P p\n3 P . N . P P . .\n2 . . . . N . B P\n1 R . B Q . R K .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00267", "split": "perception", "task_type": "board_to_fen", "fen": "r2q1rk1/pp2bppp/2n5/2pp3n/8/3PPbPP/PPP1B1K1/R1BNQ2R w - - 0 15", "prompt": "Here is the current board:\n8 r . . q . r k .\n7 p p . . b p p p\n6 . . n . . . . .\n5 . . p p . . . n\n4 . . . . . . . .\n3 . . . P P b P P\n2 P P P . B . K .\n1 R . B N Q . . R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 15\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r2q1rk1/pp2bppp/2n5/2pp3n/8/3PPbPP/PPP1B1K1/R1BNQ2R w - - 0 15", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00268", "split": "perception", "task_type": "piece_id", "fen": "r3r3/pb3kpp/1ppBp3/8/2B4P/2P5/P1P2PP1/2KRR3 w - - 6 19", "prompt": "FEN: r3r3/pb3kpp/1ppBp3/8/2B4P/2P5/P1P2PP1/2KRR3 w - - 6 19\nWhat piece is on d1?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white rook", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "d1"}} {"example_id": "perception_00269", "split": "perception", "task_type": "material_count", "fen": "8/p1k5/8/4K3/6P1/1b6/3p4/7R b - -", "prompt": "FEN: 8/p1k5/8/4K3/6P1/1b6/3p4/7R b - -\nWhat is the material count for both sides?", "gold_answer": "White (3 pieces): 1 king, 1 pawn, 1 rook. Black (4 pieces): 1 bishop, 1 king, 2 pawns. White is up 1 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00270", "split": "perception", "task_type": "square_lookup", "fen": "1r3rk1/p1q1ppbp/B5p1/5b2/8/Q1P1BP2/PP4PP/2KR3R w - -", "prompt": "FEN: 1r3rk1/p1q1ppbp/B5p1/5b2/8/Q1P1BP2/PP4PP/2KR3R w - -\nWhat is on b7?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "b7=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "b7", "diagnostic": true, "hard_gate": false, "square": "b7"}} {"example_id": "perception_00271", "split": "perception", "task_type": "rank_lookup", "fen": "8/5k2/1p1r1bp1/p1pp3p/7P/2P3P1/PP3P2/3BR1K1 w - - 0 35", "prompt": "FEN: 8/5k2/1p1r1bp1/p1pp3p/7P/2P3P1/PP3P2/3BR1K1 w - - 0 35\nWhat is the compressed FEN row for rank 1?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 1: 3BR1K1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "1", "_rank_lookup_row": "3BR1K1", "diagnostic": true, "hard_gate": false, "rank": "1", "fen_rank_row": "3BR1K1"}} {"example_id": "perception_00272", "split": "perception", "task_type": "square_coordinates", "fen": "rn2kbnr/pp2p1p1/2pqp3/3p3p/3P2PP/3Q1P2/PPP5/RNB1K1NR w KQkq -", "prompt": "FEN: rn2kbnr/pp2p1p1/2pqp3/3p3p/3P2PP/3Q1P2/PPP5/RNB1K1NR w KQkq -\nFor square e2, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "e2: file=e; rank=2; fen_row_from_top=7; file_index=5", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "e2", "diagnostic": true, "hard_gate": false, "square": "e2"}} {"example_id": "perception_00273", "split": "perception", "task_type": "fen_rank_expansion", "fen": "6k1/8/8/3p3p/1P3Q1P/2P5/6K1/8 w - -", "prompt": "FEN: 6k1/8/8/3p3p/1P3Q1P/2P5/6K1/8 w - -\nCompressed rank 1 row: 8\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 1: a=1; b=1; c=1; d=1; e=1; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "1", "_fen_rank_expansion_row": "8", "diagnostic": true, "hard_gate": false, "rank": "1", "fen_rank_row": "8"}} {"example_id": "perception_00274", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r2qk2r/ppp1nppp/4pn2/3p1b2/2PP4/2N1PN2/PP3PPP/R2QKB1R w KQkq -", "prompt": "Rank 2 row before: PP3PPP\nFile g changes from P to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 2: PP3PPP -> PP3P1P", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "g2g3", "_fen_rank_cell_edit_square": "g2", "_fen_rank_cell_edit_rank": "2", "_fen_rank_cell_edit_file": "g", "_fen_rank_cell_edit_before_row": "PP3PPP", "_fen_rank_cell_edit_after_row": "PP3P1P", "_fen_rank_cell_edit_before_fen": "P", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "g2g3", "square": "g2", "rank": "2", "file": "g", "before_row": "PP3PPP", "after_row": "PP3P1P", "before_fen": "P", "after_fen": "1"}} {"example_id": "perception_00275", "split": "perception", "task_type": "fen_board_edit", "fen": "3r2k1/6Pp/p1b1p3/1p2n3/4P3/2P3P1/P4P2/4R1K1 w - -", "prompt": "Board FEN before: 3r2k1/6Pp/p1b1p3/1p2n3/4P3/2P3P1/P4P2/4R1K1\nApply square edits: g1 K->1; g2 1->K\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 3r2k1/6Pp/p1b1p3/1p2n3/4P3/2P3P1/P4PK1/4R3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "g1g2", "_fen_board_edit_board_fen_before": "3r2k1/6Pp/p1b1p3/1p2n3/4P3/2P3P1/P4P2/4R1K1", "_fen_board_edit_board_fen_after": "3r2k1/6Pp/p1b1p3/1p2n3/4P3/2P3P1/P4PK1/4R3", "_fen_board_edit_edit_text": "g1 K->1; g2 1->K", "_fen_board_edit_changed_squares": [{"square": "g1", "before": "white king", "after": "empty", "before_fen": "K", "after_fen": "1"}, {"square": "g2", "before": "empty", "after": "white king", "before_fen": "1", "after_fen": "K"}], "diagnostic": true, "hard_gate": false, "move": "g1g2", "board_fen_before": "3r2k1/6Pp/p1b1p3/1p2n3/4P3/2P3P1/P4P2/4R1K1", "board_fen_after": "3r2k1/6Pp/p1b1p3/1p2n3/4P3/2P3P1/P4PK1/4R3", "edit_text": "g1 K->1; g2 1->K", "changed_squares": [{"square": "g1", "before": "white king", "after": "empty", "before_fen": "K", "after_fen": "1"}, {"square": "g2", "before": "empty", "after": "white king", "before_fen": "1", "after_fen": "K"}]}} {"example_id": "perception_00276", "split": "perception", "task_type": "move_square_edits", "fen": "r3k3/ppq4p/n2p1n2/2p5/2P3b1/P4NP1/1P2PPBP/R2QK2R w KQq - 2 14", "prompt": "Starting FEN: r3k3/ppq4p/n2p1n2/2p5/2P3b1/P4NP1/1P2PPBP/R2QK2R w KQq - 2 14\nMove: b2b4\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: b2=white pawn; b4=empty.\nSquares: b2 white pawn->empty; b4 empty->white pawn.\nRanks: rank 2 b P->1; rank 4 b 1->P.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "b2b4", "diagnostic": true, "hard_gate": false, "move": "b2b4"}} {"example_id": "perception_00277", "split": "perception", "task_type": "fen_assembly", "fen": "2rqnrk1/pp3ppp/1b1p4/3p4/4PQ2/3B1P2/Pn2NP1P/R5RK w - -", "prompt": "Starting FEN: 2rqnrk1/pp3ppp/1b1p4/3p4/4PQ2/3B1P2/Pn2NP1P/R5RK w - - 0 1\nMove: f4f5\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white queen f4f5.\nLookup: f4=white queen; f5=empty.\nSquares: f4 white queen->empty; f5 empty->white queen.\nRanks: rank 4 f Q->1; rank 5 f 1->Q.\nResult FEN: 2rqnrk1/pp3ppp/1b1p4/3p1Q2/4P3/3B1P2/Pn2NP1P/R5RK b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "f4f5", "diagnostic": true, "hard_gate": false, "move": "f4f5"}} {"example_id": "perception_00278", "split": "perception", "task_type": "fen_row_application", "fen": "4k2r/1b4pp/2n1pp2/1p6/3P4/1P1pPN2/3B1PPP/3K3R b k -", "prompt": "Starting FEN: 4k2r/1b4pp/2n1pp2/1p6/3P4/1P1pPN2/3B1PPP/3K3R b k - 0 1\nMove: e8e7\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: k\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 8 4k2r->7r; rank 7 1b4pp->1b2k1pp.\nResult FEN: 7r/1b2k1pp/2n1pp2/1p6/3P4/1P1pPN2/3B1PPP/3K3R w - - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "e8e7", "_fen_row_application_rank_rewrites": [{"rank": "8", "before": "4k2r", "after": "7r"}, {"rank": "7", "before": "1b4pp", "after": "1b2k1pp"}], "diagnostic": true, "hard_gate": false, "move": "e8e7", "rank_rewrites": [{"rank": "8", "before": "4k2r", "after": "7r"}, {"rank": "7", "before": "1b4pp", "after": "1b2k1pp"}]}} {"example_id": "perception_00279", "split": "perception", "task_type": "state_tracking", "fen": "rnbqkb1r/ppp2ppp/3n4/8/2BQ4/5N2/PPP2PPP/RNB1K2R b KQkq -", "prompt": "Starting FEN: rnbqkb1r/ppp2ppp/3n4/8/2BQ4/5N2/PPP2PPP/RNB1K2R b KQkq - 0 1\nAfter the moves d8e7, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rnb1kb1r/ppp1qppp/3n4/8/2BQ4/5N2/PPP2PPP/RNB1K2R w KQkq - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "d8e7", "_state_tracking_result": "rnb1kb1r/ppp1qppp/3n4/8/2BQ4/5N2/PPP2PPP/RNB1K2R w KQkq - 1 2"}} {"example_id": "perception_00280", "split": "perception", "task_type": "material_inventory", "fen": "8/2R4p/1R3Bk1/4p3/8/4PP2/4b1PP/7K w - - 3 39", "prompt": "FEN: 8/2R4p/1R3Bk1/4p3/8/4PP2/4b1PP/7K w - - 3 39\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=h1; queen=none; rook=b6,c7; bishop=f6; knight=none; pawn=g2,h2,e3,f3.\nBlack inventory: king=g6; queen=none; rook=none; bishop=e2; knight=none; pawn=e5,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00281", "split": "perception", "task_type": "material_piece_counts", "fen": "r4rk1/ppp3pp/1q3n2/4pN2/3pPn2/1P1P1R1P/P1PNQ1B1/5RK1 w - - 1 22", "prompt": "FEN: r4rk1/ppp3pp/1q3n2/4pN2/3pPn2/1P1P1R1P/P1PNQ1B1/5RK1 w - - 1 22\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=1; knight=2; pawn=6.\nBlack counts: king=1; queen=1; rook=2; bishop=0; knight=2; pawn=7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00282", "split": "perception", "task_type": "material_value_totals", "fen": "r1bq1rk1/pp2n1bp/2n1ppp1/2Pp4/1P6/P3PNP1/1B1N1PBP/R2QK2R b KQ - 0 12", "prompt": "FEN: r1bq1rk1/pp2n1bp/2n1ppp1/2Pp4/1P6/P3PNP1/1B1N1PBP/R2QK2R b KQ - 0 12\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=7; total=38.\nBlack values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=7; total=38.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00283", "split": "perception", "task_type": "material_balance_trace", "fen": "8/8/8/8/3k4/1K6/8/1R6 w - -", "prompt": "FEN: 8/8/8/8/3k4/1K6/8/1R6 w - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=b3; queen=none; rook=b1; bishop=none; knight=none; pawn=none | black king=d4; queen=none; rook=none; bishop=none; knight=none; pawn=none\nCounts: white king=1; queen=0; rook=1; bishop=0; knight=0; pawn=0 | black king=1; queen=0; rook=0; bishop=0; knight=0; pawn=0\nValues: white total=5; black total=0\nBalance: White is up 5 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00284", "split": "perception", "task_type": "multi_state_tracking", "fen": "r3kbnr/pbppqppp/1pn1p3/8/3PP3/2NB1N2/PPP2PPP/R1BQK2R w KQkq - 4 6", "prompt": "Starting FEN: r3kbnr/pbppqppp/1pn1p3/8/3PP3/2NB1N2/PPP2PPP/R1BQK2R w KQkq - 4 6\nAfter the moves c1e3 e7f6, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 4\nFullmove number: 6\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r3kbnr/pbpp1ppp/1pn1pq2/8/3PP3/2NBBN2/PPP2PPP/R2QK2R w KQkq - 6 7", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "c1e3 e7f6", "_multi_state_tracking_result": "r3kbnr/pbpp1ppp/1pn1pq2/8/3PP3/2NBBN2/PPP2PPP/R2QK2R w KQkq - 6 7", "diagnostic": true, "hard_gate": false, "moves": "c1e3 e7f6"}} {"example_id": "perception_00285", "split": "perception", "task_type": "board_print", "fen": "r1bqr1k1/pp1n1ppp/5p2/2bQ4/2P5/5N2/PP2BPPP/R1B2RK1 w - -", "prompt": "Position (FEN): r1bqr1k1/pp1n1ppp/5p2/2bQ4/2P5/5N2/PP2BPPP/R1B2RK1 w - -\nShow me the board.", "gold_answer": "8 r . b q r . k .\n7 p p . n . p p p\n6 . . . . . p . .\n5 . . b Q . . . .\n4 . . P . . . . .\n3 . . . . . N . .\n2 P P . . B P P P\n1 R . B . . R K .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00286", "split": "perception", "task_type": "board_to_fen", "fen": "rnb2bnr/pppp2pp/5k2/4N3/8/8/PPqPQPPP/RNB1K2R w KQ - 1 7", "prompt": "Here is the current board:\n8 r n b . . b n r\n7 p p p p . . p p\n6 . . . . . k . .\n5 . . . . N . . .\n4 . . . . . . . .\n3 . . . . . . . .\n2 P P q P Q P P P\n1 R N B . K . . R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 1\nFullmove number: 7\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "rnb2bnr/pppp2pp/5k2/4N3/8/8/PPqPQPPP/RNB1K2R w KQ - 1 7", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00287", "split": "perception", "task_type": "piece_id", "fen": "3Rbk2/r1q2ppp/4p3/p7/2p4Q/2P2B1P/5PP1/6K1 w - - 2 31", "prompt": "FEN: 3Rbk2/r1q2ppp/4p3/p7/2p4Q/2P2B1P/5PP1/6K1 w - - 2 31\nWhat piece is on h4?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white queen", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "h4"}} {"example_id": "perception_00288", "split": "perception", "task_type": "material_count", "fen": "2kbb1r1/1pp3B1/p6p/3r1p2/1P6/2P2N1P/P4PP1/R3R1K1 b - -", "prompt": "FEN: 2kbb1r1/1pp3B1/p6p/3r1p2/1P6/2P2N1P/P4PP1/R3R1K1 b - -\nWhat is the material count for both sides?", "gold_answer": "White (11 pieces): 1 bishop, 1 king, 1 knight, 6 pawns, 2 rooks. Black (10 pieces): 2 bishops, 1 king, 5 pawns, 2 rooks. White is up 1 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00289", "split": "perception", "task_type": "square_lookup", "fen": "6k1/5pp1/4n2p/1p6/5P2/1r1N1KPP/8/8 w - - 2 42", "prompt": "FEN: 6k1/5pp1/4n2p/1p6/5P2/1r1N1KPP/8/8 w - - 2 42\nWhat is on c1?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "c1=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "c1", "diagnostic": true, "hard_gate": false, "square": "c1"}} {"example_id": "perception_00290", "split": "perception", "task_type": "rank_lookup", "fen": "r2qkb1r/1p3ppp/p1n1p3/3n4/3P4/2N2b1P/PP3PP1/R1BQRBK1 w kq -", "prompt": "FEN: r2qkb1r/1p3ppp/p1n1p3/3n4/3P4/2N2b1P/PP3PP1/R1BQRBK1 w kq -\nWhat is the compressed FEN row for rank 2?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 2: PP3PP1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "2", "_rank_lookup_row": "PP3PP1", "diagnostic": true, "hard_gate": false, "rank": "2", "fen_rank_row": "PP3PP1"}} {"example_id": "perception_00291", "split": "perception", "task_type": "square_coordinates", "fen": "r1bqkb1r/p4ppp/1nn1p3/2ppP3/1pPP4/6P1/PP1NNPBP/R1BQ1RK1 b kq -", "prompt": "FEN: r1bqkb1r/p4ppp/1nn1p3/2ppP3/1pPP4/6P1/PP1NNPBP/R1BQ1RK1 b kq -\nFor square c6, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "c6: file=c; rank=6; fen_row_from_top=3; file_index=3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "c6", "diagnostic": true, "hard_gate": false, "square": "c6"}} {"example_id": "perception_00292", "split": "perception", "task_type": "fen_rank_expansion", "fen": "5rk1/R5b1/2Bp1Bpp/5q2/2p1N1b1/2P5/3Q2P1/6K1 b - -", "prompt": "FEN: 5rk1/R5b1/2Bp1Bpp/5q2/2p1N1b1/2P5/3Q2P1/6K1 b - -\nCompressed rank 5 row: 5q2\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 5: a=1; b=1; c=1; d=1; e=1; f=q; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "5", "_fen_rank_expansion_row": "5q2", "diagnostic": true, "hard_gate": false, "rank": "5", "fen_rank_row": "5q2"}} {"example_id": "perception_00293", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "4nr1k/1bp1q2p/p4pp1/Np2p3/4Pb1B/2P2B1P/PPQ2PP1/3R2K1 b - - 2 23", "prompt": "Rank 4 row before: 4Pb1B\nFile b changes from 1 to q. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 4: 4Pb1B -> 1q2Pb1B", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "e7b4", "_fen_rank_cell_edit_square": "b4", "_fen_rank_cell_edit_rank": "4", "_fen_rank_cell_edit_file": "b", "_fen_rank_cell_edit_before_row": "4Pb1B", "_fen_rank_cell_edit_after_row": "1q2Pb1B", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "q", "diagnostic": true, "hard_gate": false, "move": "e7b4", "square": "b4", "rank": "4", "file": "b", "before_row": "4Pb1B", "after_row": "1q2Pb1B", "before_fen": "1", "after_fen": "q"}} {"example_id": "perception_00294", "split": "perception", "task_type": "fen_board_edit", "fen": "8/Nk6/1p6/5R2/5Rp1/P7/1P3PP1/6K1 w - - 1 43", "prompt": "Board FEN before: 8/Nk6/1p6/5R2/5Rp1/P7/1P3PP1/6K1\nApply square edits: f5 R->1; g5 1->R\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 8/Nk6/1p6/6R1/5Rp1/P7/1P3PP1/6K1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "f5g5", "_fen_board_edit_board_fen_before": "8/Nk6/1p6/5R2/5Rp1/P7/1P3PP1/6K1", "_fen_board_edit_board_fen_after": "8/Nk6/1p6/6R1/5Rp1/P7/1P3PP1/6K1", "_fen_board_edit_edit_text": "f5 R->1; g5 1->R", "_fen_board_edit_changed_squares": [{"square": "f5", "before": "white rook", "after": "empty", "before_fen": "R", "after_fen": "1"}, {"square": "g5", "before": "empty", "after": "white rook", "before_fen": "1", "after_fen": "R"}], "diagnostic": true, "hard_gate": false, "move": "f5g5", "board_fen_before": "8/Nk6/1p6/5R2/5Rp1/P7/1P3PP1/6K1", "board_fen_after": "8/Nk6/1p6/6R1/5Rp1/P7/1P3PP1/6K1", "edit_text": "f5 R->1; g5 1->R", "changed_squares": [{"square": "f5", "before": "white rook", "after": "empty", "before_fen": "R", "after_fen": "1"}, {"square": "g5", "before": "empty", "after": "white rook", "before_fen": "1", "after_fen": "R"}]}} {"example_id": "perception_00295", "split": "perception", "task_type": "move_square_edits", "fen": "1k1r3r/pbq4p/4B1p1/2p1np2/4p3/1QB1P2P/PP4P1/R4RK1 b - -", "prompt": "Starting FEN: 1k1r3r/pbq4p/4B1p1/2p1np2/4p3/1QB1P2P/PP4P1/R4RK1 b - -\nMove: c7g7\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: c7=black queen; g7=empty.\nSquares: c7 black queen->empty; g7 empty->black queen.\nRanks: rank 7 c q->1; rank 7 g 1->q.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "c7g7", "diagnostic": true, "hard_gate": false, "move": "c7g7"}} {"example_id": "perception_00296", "split": "perception", "task_type": "fen_assembly", "fen": "8/8/8/8/8/2k2N2/8/3BK3 b - -", "prompt": "Starting FEN: 8/8/8/8/8/2k2N2/8/3BK3 b - - 0 1\nMove: c3b2\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black king c3b2.\nLookup: c3=black king; b2=empty.\nSquares: c3 black king->empty; b2 empty->black king.\nRanks: rank 3 c k->1; rank 2 b 1->k.\nResult FEN: 8/8/8/8/8/5N2/1k6/3BK3 w - - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "c3b2", "diagnostic": true, "hard_gate": false, "move": "c3b2"}} {"example_id": "perception_00297", "split": "perception", "task_type": "fen_row_application", "fen": "1r4k1/p4p1p/3p2P1/2nPP2P/2q5/8/K1PR1Q2/6R1 w - -", "prompt": "Starting FEN: 1r4k1/p4p1p/3p2P1/2nPP2P/2q5/8/K1PR1Q2/6R1 w - - 0 1\nMove: a2a3\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 2 K1PR1Q2->2PR1Q2; rank 3 8->K7.\nResult FEN: 1r4k1/p4p1p/3p2P1/2nPP2P/2q5/K7/2PR1Q2/6R1 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "a2a3", "_fen_row_application_rank_rewrites": [{"rank": "2", "before": "K1PR1Q2", "after": "2PR1Q2"}, {"rank": "3", "before": "8", "after": "K7"}], "diagnostic": true, "hard_gate": false, "move": "a2a3", "rank_rewrites": [{"rank": "2", "before": "K1PR1Q2", "after": "2PR1Q2"}, {"rank": "3", "before": "8", "after": "K7"}]}} {"example_id": "perception_00298", "split": "perception", "task_type": "state_tracking", "fen": "3rk3/p7/1p1P1p2/2b1P3/2R5/2P4P/P6K/3R4 w - - 0 36", "prompt": "Starting FEN: 3rk3/p7/1p1P1p2/2b1P3/2R5/2P4P/P6K/3R4 w - - 0 36\nAfter the moves d1d2, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 36\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 3rk3/p7/1p1P1p2/2b1P3/2R5/2P4P/P2R3K/8 b - - 1 36", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "d1d2", "_state_tracking_result": "3rk3/p7/1p1P1p2/2b1P3/2R5/2P4P/P2R3K/8 b - - 1 36"}} {"example_id": "perception_00299", "split": "perception", "task_type": "material_inventory", "fen": "r3k2r/p1pn2pp/1p1b4/3Ppp2/8/1BP2P1P/PBP2P2/R4RK1 w kq - 0 15", "prompt": "FEN: r3k2r/p1pn2pp/1p1b4/3Ppp2/8/1BP2P1P/PBP2P2/R4RK1 w kq - 0 15\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=none; rook=a1,f1; bishop=b2,b3; knight=none; pawn=a2,c2,f2,c3,f3,h3,d5.\nBlack inventory: king=e8; queen=none; rook=a8,h8; bishop=d6; knight=d7; pawn=e5,f5,b6,a7,c7,g7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00300", "split": "perception", "task_type": "material_piece_counts", "fen": "2k1r2r/ppb2pp1/5qp1/3p4/1PQ2P2/7P/P5P1/2BR1RK1 w - - 0 24", "prompt": "FEN: 2k1r2r/ppb2pp1/5qp1/3p4/1PQ2P2/7P/P5P1/2BR1RK1 w - - 0 24\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=1; knight=0; pawn=5.\nBlack counts: king=1; queen=1; rook=2; bishop=1; knight=0; pawn=6.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00301", "split": "perception", "task_type": "material_value_totals", "fen": "r2q1rk1/p2nn1bp/6p1/7P/4p3/2N2Q2/PPP2PP1/R1B1K1NR w KQ - 0 15", "prompt": "FEN: r2q1rk1/p2nn1bp/6p1/7P/4p3/2N2Q2/PPP2PP1/R1B1K1NR w KQ - 0 15\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=3; knight=6; pawn=6; total=34.\nBlack values: king=0; queen=9; rook=10; bishop=3; knight=6; pawn=4; total=32.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00302", "split": "perception", "task_type": "material_balance_trace", "fen": "8/8/5p2/6p1/6k1/8/4K3/8 b - - 1 55", "prompt": "FEN: 8/8/5p2/6p1/6k1/8/4K3/8 b - - 1 55\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=e2; queen=none; rook=none; bishop=none; knight=none; pawn=none | black king=g4; queen=none; rook=none; bishop=none; knight=none; pawn=g5,f6\nCounts: white king=1; queen=0; rook=0; bishop=0; knight=0; pawn=0 | black king=1; queen=0; rook=0; bishop=0; knight=0; pawn=2\nValues: white total=0; black total=2\nBalance: Black is up 2 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00303", "split": "perception", "task_type": "multi_state_tracking", "fen": "r4rk1/4qpp1/b3pn1p/p1pp4/P1P5/1P2PP2/3N2PP/R1BQ1RK1 b - - 0 17", "prompt": "Starting FEN: r4rk1/4qpp1/b3pn1p/p1pp4/P1P5/1P2PP2/3N2PP/R1BQ1RK1 b - - 0 17\nAfter the moves f8c8 d2e4 d5c4, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 17\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r1r3k1/4qpp1/b3pn1p/p1p5/P1p1N3/1P2PP2/6PP/R1BQ1RK1 w - - 0 19", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "f8c8 d2e4 d5c4", "_multi_state_tracking_result": "r1r3k1/4qpp1/b3pn1p/p1p5/P1p1N3/1P2PP2/6PP/R1BQ1RK1 w - - 0 19", "diagnostic": true, "hard_gate": false, "moves": "f8c8 d2e4 d5c4"}} {"example_id": "perception_00304", "split": "perception", "task_type": "board_print", "fen": "7Q/6p1/8/8/6PK/1k6/5q1P/8 w - - 7 56", "prompt": "Position (FEN): 7Q/6p1/8/8/6PK/1k6/5q1P/8 w - - 7 56\nShow me the board.", "gold_answer": "8 . . . . . . . Q\n7 . . . . . . p .\n6 . . . . . . . .\n5 . . . . . . . .\n4 . . . . . . P K\n3 . k . . . . . .\n2 . . . . . q . P\n1 . . . . . . . .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00305", "split": "perception", "task_type": "board_to_fen", "fen": "r2qkb1Q/pppn4/3pp1p1/8/8/2P5/PPP2PPP/R1B2RK1 w q -", "prompt": "Here is the current board:\n8 r . . q k b . Q\n7 p p p n . . . .\n6 . . . p p . p .\n5 . . . . . . . .\n4 . . . . . . . .\n3 . . P . . . . .\n2 P P P . . P P P\n1 R . B . . R K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: q\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r2qkb1Q/pppn4/3pp1p1/8/8/2P5/PPP2PPP/R1B2RK1 w q - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00306", "split": "perception", "task_type": "piece_id", "fen": "2r5/8/4k3/1K6/1P1R4/8/8/8 b - -", "prompt": "FEN: 2r5/8/4k3/1K6/1P1R4/8/8/8 b - -\nWhat piece is on c8?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black rook", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "c8"}} {"example_id": "perception_00307", "split": "perception", "task_type": "material_count", "fen": "r1b1k2r/pp2ppbp/2n3p1/8/3P1B2/4PN2/P2qBPPP/R3K2R w KQkq -", "prompt": "FEN: r1b1k2r/pp2ppbp/2n3p1/8/3P1B2/4PN2/P2qBPPP/R3K2R w KQkq -\nWhat is the material count for both sides?", "gold_answer": "White (12 pieces): 2 bishops, 1 king, 1 knight, 6 pawns, 2 rooks. Black (13 pieces): 2 bishops, 1 king, 1 knight, 6 pawns, 1 queen, 2 rooks. Black is up 9 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00308", "split": "perception", "task_type": "square_lookup", "fen": "5rk1/p6p/1pp3p1/3p4/P2P4/6PP/5R2/6K1 b - - 0 40", "prompt": "FEN: 5rk1/p6p/1pp3p1/3p4/P2P4/6PP/5R2/6K1 b - - 0 40\nWhat is on h1?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "h1=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "h1", "diagnostic": true, "hard_gate": false, "square": "h1"}} {"example_id": "perception_00309", "split": "perception", "task_type": "rank_lookup", "fen": "r1b3k1/pp2q2r/2p1pn1Q/3p4/2PPp3/6P1/PP2PPBP/R4RK1 w - - 1 17", "prompt": "FEN: r1b3k1/pp2q2r/2p1pn1Q/3p4/2PPp3/6P1/PP2PPBP/R4RK1 w - - 1 17\nWhat is the compressed FEN row for rank 2?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 2: PP2PPBP", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "2", "_rank_lookup_row": "PP2PPBP", "diagnostic": true, "hard_gate": false, "rank": "2", "fen_rank_row": "PP2PPBP"}} {"example_id": "perception_00310", "split": "perception", "task_type": "square_coordinates", "fen": "8/7p/6pk/8/8/3P1q2/5bRP/Q6K b - -", "prompt": "FEN: 8/7p/6pk/8/8/3P1q2/5bRP/Q6K b - -\nFor square h5, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "h5: file=h; rank=5; fen_row_from_top=4; file_index=8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "h5", "diagnostic": true, "hard_gate": false, "square": "h5"}} {"example_id": "perception_00311", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r3kbnr/p3p2p/1pp2p2/2n3p1/2Q5/5NP1/PqPB1P1P/2R1KB1R w Kkq - 0 17", "prompt": "FEN: r3kbnr/p3p2p/1pp2p2/2n3p1/2Q5/5NP1/PqPB1P1P/2R1KB1R w Kkq - 0 17\nCompressed rank 5 row: 2n3p1\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 5: a=1; b=1; c=n; d=1; e=1; f=1; g=p; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "5", "_fen_rank_expansion_row": "2n3p1", "diagnostic": true, "hard_gate": false, "rank": "5", "fen_rank_row": "2n3p1"}} {"example_id": "perception_00312", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "4k1r1/3p3p/1p6/4p3/8/r4P2/5P1P/2R4K b - - 1 27", "prompt": "Rank 5 row before: 4p3\nFile g changes from 1 to r. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 5: 4p3 -> 4p1r1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "g8g5", "_fen_rank_cell_edit_square": "g5", "_fen_rank_cell_edit_rank": "5", "_fen_rank_cell_edit_file": "g", "_fen_rank_cell_edit_before_row": "4p3", "_fen_rank_cell_edit_after_row": "4p1r1", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "r", "diagnostic": true, "hard_gate": false, "move": "g8g5", "square": "g5", "rank": "5", "file": "g", "before_row": "4p3", "after_row": "4p1r1", "before_fen": "1", "after_fen": "r"}} {"example_id": "perception_00313", "split": "perception", "task_type": "fen_board_edit", "fen": "8/pPk5/P7/8/1K6/8/8/8 w - -", "prompt": "Board FEN before: 8/pPk5/P7/8/1K6/8/8/8\nApply square edits: b4 K->1; b5 1->K\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 8/pPk5/P7/1K6/8/8/8/8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "b4b5", "_fen_board_edit_board_fen_before": "8/pPk5/P7/8/1K6/8/8/8", "_fen_board_edit_board_fen_after": "8/pPk5/P7/1K6/8/8/8/8", "_fen_board_edit_edit_text": "b4 K->1; b5 1->K", "_fen_board_edit_changed_squares": [{"square": "b4", "before": "white king", "after": "empty", "before_fen": "K", "after_fen": "1"}, {"square": "b5", "before": "empty", "after": "white king", "before_fen": "1", "after_fen": "K"}], "diagnostic": true, "hard_gate": false, "move": "b4b5", "board_fen_before": "8/pPk5/P7/8/1K6/8/8/8", "board_fen_after": "8/pPk5/P7/1K6/8/8/8/8", "edit_text": "b4 K->1; b5 1->K", "changed_squares": [{"square": "b4", "before": "white king", "after": "empty", "before_fen": "K", "after_fen": "1"}, {"square": "b5", "before": "empty", "after": "white king", "before_fen": "1", "after_fen": "K"}]}} {"example_id": "perception_00314", "split": "perception", "task_type": "move_square_edits", "fen": "r1bqkb1r/ppp2ppp/2n1pn2/3p4/4P3/3P1NP1/PPPN1P1P/R1BQKB1R b KQkq -", "prompt": "Starting FEN: r1bqkb1r/ppp2ppp/2n1pn2/3p4/4P3/3P1NP1/PPPN1P1P/R1BQKB1R b KQkq -\nMove: f6h5\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: f6=black knight; h5=empty.\nSquares: f6 black knight->empty; h5 empty->black knight.\nRanks: rank 6 f n->1; rank 5 h 1->n.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "f6h5", "diagnostic": true, "hard_gate": false, "move": "f6h5"}} {"example_id": "perception_00315", "split": "perception", "task_type": "fen_assembly", "fen": "5b1r/pppk2p1/1r5p/1P6/P1nPNP2/2P5/5PKP/R3R3 w - - 1 24", "prompt": "Starting FEN: 5b1r/pppk2p1/1r5p/1P6/P1nPNP2/2P5/5PKP/R3R3 w - - 1 24\nMove: g2f1\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 24\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white king g2f1.\nLookup: g2=white king; f1=empty.\nSquares: g2 white king->empty; f1 empty->white king.\nRanks: rank 2 g K->1; rank 1 f 1->K.\nResult FEN: 5b1r/pppk2p1/1r5p/1P6/P1nPNP2/2P5/5P1P/R3RK2 b - - 2 24", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "g2f1", "diagnostic": true, "hard_gate": false, "move": "g2f1"}} {"example_id": "perception_00316", "split": "perception", "task_type": "fen_row_application", "fen": "rnbqk1nr/pp3ppp/2p5/3p4/1bPPp3/2N3P1/PP2PPBP/R1BQK1NR w KQkq -", "prompt": "Starting FEN: rnbqk1nr/pp3ppp/2p5/3p4/1bPPp3/2N3P1/PP2PPBP/R1BQK1NR w KQkq - 0 1\nMove: d1d3\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 1 R1BQK1NR->R1B1K1NR; rank 3 2N3P1->2NQ2P1.\nResult FEN: rnbqk1nr/pp3ppp/2p5/3p4/1bPPp3/2NQ2P1/PP2PPBP/R1B1K1NR b KQkq - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "d1d3", "_fen_row_application_rank_rewrites": [{"rank": "1", "before": "R1BQK1NR", "after": "R1B1K1NR"}, {"rank": "3", "before": "2N3P1", "after": "2NQ2P1"}], "diagnostic": true, "hard_gate": false, "move": "d1d3", "rank_rewrites": [{"rank": "1", "before": "R1BQK1NR", "after": "R1B1K1NR"}, {"rank": "3", "before": "2N3P1", "after": "2NQ2P1"}]}} {"example_id": "perception_00317", "split": "perception", "task_type": "state_tracking", "fen": "r2qkb1r/pb1n1ppp/1p2pn2/2ppN3/3P1P2/2PBP3/PP4PP/RNBQ1RK1 b kq - 0 8", "prompt": "Starting FEN: r2qkb1r/pb1n1ppp/1p2pn2/2ppN3/3P1P2/2PBP3/PP4PP/RNBQ1RK1 b kq - 0 8\nAfter the moves b7a6, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: kq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 8\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r2qkb1r/p2n1ppp/bp2pn2/2ppN3/3P1P2/2PBP3/PP4PP/RNBQ1RK1 w kq - 1 9", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "b7a6", "_state_tracking_result": "r2qkb1r/p2n1ppp/bp2pn2/2ppN3/3P1P2/2PBP3/PP4PP/RNBQ1RK1 w kq - 1 9"}} {"example_id": "perception_00318", "split": "perception", "task_type": "material_inventory", "fen": "rnbqkbnr/pp1p1ppp/8/4p3/2Pp4/3Q4/PP2PPPP/RNB1KBNR w KQkq - 0 4", "prompt": "FEN: rnbqkbnr/pp1p1ppp/8/4p3/2Pp4/3Q4/PP2PPPP/RNB1KBNR w KQkq - 0 4\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=e1; queen=d3; rook=a1,h1; bishop=c1,f1; knight=b1,g1; pawn=a2,b2,e2,f2,g2,h2,c4.\nBlack inventory: king=e8; queen=d8; rook=a8,h8; bishop=c8,f8; knight=b8,g8; pawn=d4,e5,a7,b7,d7,f7,g7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00319", "split": "perception", "task_type": "material_piece_counts", "fen": "8/pp6/5Nk1/6pp/8/P1B3PP/1P3PK1/8 w - - 0 33", "prompt": "FEN: 8/pp6/5Nk1/6pp/8/P1B3PP/1P3PK1/8 w - - 0 33\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=0; bishop=1; knight=1; pawn=5.\nBlack counts: king=1; queen=0; rook=0; bishop=0; knight=0; pawn=4.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00320", "split": "perception", "task_type": "material_value_totals", "fen": "8/p2b4/1p6/1P1pkp2/r5P1/1R1B4/7K/8 b - - 0 44", "prompt": "FEN: 8/p2b4/1p6/1P1pkp2/r5P1/1R1B4/7K/8 b - - 0 44\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=5; bishop=3; knight=0; pawn=2; total=10.\nBlack values: king=0; queen=0; rook=5; bishop=3; knight=0; pawn=4; total=12.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00321", "split": "perception", "task_type": "material_balance_trace", "fen": "rnbqr1k1/ppp2ppp/3b1n2/3p4/4p3/1P2P1P1/PBPPNPBP/RN1Q1RK1 w - - 7 8", "prompt": "FEN: rnbqr1k1/ppp2ppp/3b1n2/3p4/4p3/1P2P1P1/PBPPNPBP/RN1Q1RK1 w - - 7 8\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=d1; rook=a1,f1; bishop=b2,g2; knight=b1,e2; pawn=a2,c2,d2,f2,h2,b3,e3,g3 | black king=g8; queen=d8; rook=a8,e8; bishop=d6,c8; knight=f6,b8; pawn=e4,d5,a7,b7,c7,f7,g7,h7\nCounts: white king=1; queen=1; rook=2; bishop=2; knight=2; pawn=8 | black king=1; queen=1; rook=2; bishop=2; knight=2; pawn=8\nValues: white total=39; black total=39\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00322", "split": "perception", "task_type": "multi_state_tracking", "fen": "rnbqk1nr/pp3ppp/2pb4/3p4/3P4/1B3N2/PPP2PPP/RNBQK2R b KQkq -", "prompt": "Starting FEN: rnbqk1nr/pp3ppp/2pb4/3p4/3P4/1B3N2/PPP2PPP/RNBQK2R b KQkq - 0 1\nAfter the moves f7f5 f3g5 a7a5, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rnbqk1nr/1p4pp/2pb4/p2p1pN1/3P4/1B6/PPP2PPP/RNBQK2R w KQkq - 0 3", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "f7f5 f3g5 a7a5", "_multi_state_tracking_result": "rnbqk1nr/1p4pp/2pb4/p2p1pN1/3P4/1B6/PPP2PPP/RNBQK2R w KQkq - 0 3", "diagnostic": true, "hard_gate": false, "moves": "f7f5 f3g5 a7a5"}} {"example_id": "perception_00323", "split": "perception", "task_type": "board_print", "fen": "2kr3r/ppp1n1pp/8/4P3/1b2N3/2Pb4/PP1B2PP/2K1R2R w - - 2 18", "prompt": "Position (FEN): 2kr3r/ppp1n1pp/8/4P3/1b2N3/2Pb4/PP1B2PP/2K1R2R w - - 2 18\nShow me the board.", "gold_answer": "8 . . k r . . . r\n7 p p p . n . p p\n6 . . . . . . . .\n5 . . . . P . . .\n4 . b . . N . . .\n3 . . P b . . . .\n2 P P . B . . P P\n1 . . K . R . . R\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00324", "split": "perception", "task_type": "board_to_fen", "fen": "rn2kb1r/pp1B1ppp/1n6/2pqP3/8/5N2/PP4PP/RNBQK2R b KQkq - 0 11", "prompt": "Here is the current board:\n8 r n . . k b . r\n7 p p . B . p p p\n6 . n . . . . . .\n5 . . p q P . . .\n4 . . . . . . . .\n3 . . . . . N . .\n2 P P . . . . P P\n1 R N B Q K . . R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 11\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "rn2kb1r/pp1B1ppp/1n6/2pqP3/8/5N2/PP4PP/RNBQK2R b KQkq - 0 11", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00325", "split": "perception", "task_type": "piece_id", "fen": "r2q1k1r/p1p1bppp/2Qp1n2/8/8/P6P/1PPB1PP1/RN2K2R b KQ - 0 13", "prompt": "FEN: r2q1k1r/p1p1bppp/2Qp1n2/8/8/P6P/1PPB1PP1/RN2K2R b KQ - 0 13\nWhat piece is on a3?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "a3"}} {"example_id": "perception_00326", "split": "perception", "task_type": "material_count", "fen": "r4k2/5p2/1n4pr/p5p1/1ppR4/P4P2/1PB2PK1/4R3 w - - 0 30", "prompt": "FEN: r4k2/5p2/1n4pr/p5p1/1ppR4/P4P2/1PB2PK1/4R3 w - - 0 30\nWhat is the material count for both sides?", "gold_answer": "White (8 pieces): 1 bishop, 1 king, 4 pawns, 2 rooks. Black (10 pieces): 1 king, 1 knight, 6 pawns, 2 rooks. Black is up 2 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00327", "split": "perception", "task_type": "square_lookup", "fen": "r1b2rk1/1pq1n1pp/p2p1p2/2p1b3/4P3/1PN1Q1P1/P1P2PBP/B1R2RK1 b - - 1 14", "prompt": "FEN: r1b2rk1/1pq1n1pp/p2p1p2/2p1b3/4P3/1PN1Q1P1/P1P2PBP/B1R2RK1 b - - 1 14\nWhat is on e2?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "e2=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "e2", "diagnostic": true, "hard_gate": false, "square": "e2"}} {"example_id": "perception_00328", "split": "perception", "task_type": "rank_lookup", "fen": "r1b2rk1/2p2ppp/ppp1n1q1/8/3P4/4B3/PPPN2PP/R2Q1R1K w - - 0 16", "prompt": "FEN: r1b2rk1/2p2ppp/ppp1n1q1/8/3P4/4B3/PPPN2PP/R2Q1R1K w - - 0 16\nWhat is the compressed FEN row for rank 3?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 3: 4B3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "3", "_rank_lookup_row": "4B3", "diagnostic": true, "hard_gate": false, "rank": "3", "fen_rank_row": "4B3"}} {"example_id": "perception_00329", "split": "perception", "task_type": "square_coordinates", "fen": "5R2/2qk3p/p5p1/1p1Bp3/8/2P1B3/P1PR2PP/6K1 w - -", "prompt": "FEN: 5R2/2qk3p/p5p1/1p1Bp3/8/2P1B3/P1PR2PP/6K1 w - -\nFor square d2, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "d2: file=d; rank=2; fen_row_from_top=7; file_index=4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "d2", "diagnostic": true, "hard_gate": false, "square": "d2"}} {"example_id": "perception_00330", "split": "perception", "task_type": "fen_rank_expansion", "fen": "8/4k3/R6p/Pp1p4/3P4/2P4P/1P1K4/8 w - -", "prompt": "FEN: 8/4k3/R6p/Pp1p4/3P4/2P4P/1P1K4/8 w - -\nCompressed rank 3 row: 2P4P\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 3: a=1; b=1; c=P; d=1; e=1; f=1; g=1; h=P", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "3", "_fen_rank_expansion_row": "2P4P", "diagnostic": true, "hard_gate": false, "rank": "3", "fen_rank_row": "2P4P"}} {"example_id": "perception_00331", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r4rk1/1b1p1ppp/p1n1p3/1pp3q1/4P3/P1NP4/BPP2QPP/2KR3R w - - 0 15", "prompt": "Rank 3 row before: P1NP4\nFile e changes from 1 to Q. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 3: P1NP4 -> P1NPQ3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "f2e3", "_fen_rank_cell_edit_square": "e3", "_fen_rank_cell_edit_rank": "3", "_fen_rank_cell_edit_file": "e", "_fen_rank_cell_edit_before_row": "P1NP4", "_fen_rank_cell_edit_after_row": "P1NPQ3", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "Q", "diagnostic": true, "hard_gate": false, "move": "f2e3", "square": "e3", "rank": "3", "file": "e", "before_row": "P1NP4", "after_row": "P1NPQ3", "before_fen": "1", "after_fen": "Q"}} {"example_id": "perception_00332", "split": "perception", "task_type": "fen_board_edit", "fen": "1k5r/pp3ppp/3r4/4p3/3n4/P4q2/5K1P/3RQ1NR w - - 0 27", "prompt": "Board FEN before: 1k5r/pp3ppp/3r4/4p3/3n4/P4q2/5K1P/3RQ1NR\nApply square edits: g1 N->1; f3 q->N\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 1k5r/pp3ppp/3r4/4p3/3n4/P4N2/5K1P/3RQ2R", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "g1f3", "_fen_board_edit_board_fen_before": "1k5r/pp3ppp/3r4/4p3/3n4/P4q2/5K1P/3RQ1NR", "_fen_board_edit_board_fen_after": "1k5r/pp3ppp/3r4/4p3/3n4/P4N2/5K1P/3RQ2R", "_fen_board_edit_edit_text": "g1 N->1; f3 q->N", "_fen_board_edit_changed_squares": [{"square": "g1", "before": "white knight", "after": "empty", "before_fen": "N", "after_fen": "1"}, {"square": "f3", "before": "black queen", "after": "white knight", "before_fen": "q", "after_fen": "N"}], "diagnostic": true, "hard_gate": false, "move": "g1f3", "board_fen_before": "1k5r/pp3ppp/3r4/4p3/3n4/P4q2/5K1P/3RQ1NR", "board_fen_after": "1k5r/pp3ppp/3r4/4p3/3n4/P4N2/5K1P/3RQ2R", "edit_text": "g1 N->1; f3 q->N", "changed_squares": [{"square": "g1", "before": "white knight", "after": "empty", "before_fen": "N", "after_fen": "1"}, {"square": "f3", "before": "black queen", "after": "white knight", "before_fen": "q", "after_fen": "N"}]}} {"example_id": "perception_00333", "split": "perception", "task_type": "move_square_edits", "fen": "r3r1k1/5ppp/2bB4/3p4/3P3P/2P2KPN/p4P2/R7 b - - 3 30", "prompt": "Starting FEN: r3r1k1/5ppp/2bB4/3p4/3P3P/2P2KPN/p4P2/R7 b - - 3 30\nMove: c6b5\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: c6=black bishop; b5=empty.\nSquares: c6 black bishop->empty; b5 empty->black bishop.\nRanks: rank 6 c b->1; rank 5 b 1->b.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "c6b5", "diagnostic": true, "hard_gate": false, "move": "c6b5"}} {"example_id": "perception_00334", "split": "perception", "task_type": "fen_assembly", "fen": "r4rk1/ppp1nppp/4b3/q7/3P1PP1/1PN2N2/P1P1Q2P/2KR3R w - - 1 20", "prompt": "Starting FEN: r4rk1/ppp1nppp/4b3/q7/3P1PP1/1PN2N2/P1P1Q2P/2KR3R w - - 1 20\nMove: e2d2\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 20\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white queen e2d2.\nLookup: e2=white queen; d2=empty.\nSquares: e2 white queen->empty; d2 empty->white queen.\nRanks: rank 2 e Q->1; rank 2 d 1->Q.\nResult FEN: r4rk1/ppp1nppp/4b3/q7/3P1PP1/1PN2N2/P1PQ3P/2KR3R b - - 2 20", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "e2d2", "diagnostic": true, "hard_gate": false, "move": "e2d2"}} {"example_id": "perception_00335", "split": "perception", "task_type": "fen_row_application", "fen": "rnbqk2r/pp3ppp/3p1n2/3p4/3P4/5N2/PPP2PPP/RN1QKB1R w KQkq -", "prompt": "Starting FEN: rnbqk2r/pp3ppp/3p1n2/3p4/3P4/5N2/PPP2PPP/RN1QKB1R w KQkq - 0 1\nMove: f1a6\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 1 RN1QKB1R->RN1QK2R; rank 6 3p1n2->B2p1n2.\nResult FEN: rnbqk2r/pp3ppp/B2p1n2/3p4/3P4/5N2/PPP2PPP/RN1QK2R b KQkq - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "f1a6", "_fen_row_application_rank_rewrites": [{"rank": "1", "before": "RN1QKB1R", "after": "RN1QK2R"}, {"rank": "6", "before": "3p1n2", "after": "B2p1n2"}], "diagnostic": true, "hard_gate": false, "move": "f1a6", "rank_rewrites": [{"rank": "1", "before": "RN1QKB1R", "after": "RN1QK2R"}, {"rank": "6", "before": "3p1n2", "after": "B2p1n2"}]}} {"example_id": "perception_00336", "split": "perception", "task_type": "state_tracking", "fen": "rnb1kbnr/pp3pp1/2pp1q1p/4p3/2B1P3/1QP2N2/PP1P1PPP/RNB1K2R w KQkq - 2 6", "prompt": "Starting FEN: rnb1kbnr/pp3pp1/2pp1q1p/4p3/2B1P3/1QP2N2/PP1P1PPP/RNB1K2R w KQkq - 2 6\nAfter the moves h2h4, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 2\nFullmove number: 6\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rnb1kbnr/pp3pp1/2pp1q1p/4p3/2B1P2P/1QP2N2/PP1P1PP1/RNB1K2R b KQkq - 0 6", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "h2h4", "_state_tracking_result": "rnb1kbnr/pp3pp1/2pp1q1p/4p3/2B1P2P/1QP2N2/PP1P1PP1/RNB1K2R b KQkq - 0 6"}} {"example_id": "perception_00337", "split": "perception", "task_type": "material_inventory", "fen": "r4rk1/p4pbp/1p1q1np1/2pP4/1nQ2P2/P5P1/1P1PN1BP/R1B2RK1 b - - 0 18", "prompt": "FEN: r4rk1/p4pbp/1p1q1np1/2pP4/1nQ2P2/P5P1/1P1PN1BP/R1B2RK1 b - - 0 18\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=c4; rook=a1,f1; bishop=c1,g2; knight=e2; pawn=b2,d2,h2,a3,g3,f4,d5.\nBlack inventory: king=g8; queen=d6; rook=a8,f8; bishop=g7; knight=b4,f6; pawn=c5,b6,g6,a7,f7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00338", "split": "perception", "task_type": "material_piece_counts", "fen": "8/8/8/8/5KPP/1k6/8/8 b - -", "prompt": "FEN: 8/8/8/8/5KPP/1k6/8/8 b - -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=0; bishop=0; knight=0; pawn=2.\nBlack counts: king=1; queen=0; rook=0; bishop=0; knight=0; pawn=0.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00339", "split": "perception", "task_type": "material_value_totals", "fen": "r1b2rk1/5ppp/p1p5/3q4/5Q2/8/PP2BPPP/R4RK1 b - -", "prompt": "FEN: r1b2rk1/5ppp/p1p5/3q4/5Q2/8/PP2BPPP/R4RK1 b - -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=3; knight=0; pawn=5; total=27.\nBlack values: king=0; queen=9; rook=10; bishop=3; knight=0; pawn=5; total=27.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00340", "split": "perception", "task_type": "material_balance_trace", "fen": "5rk1/2p1qp2/1bnp1n1p/1p2p1p1/1P2P3/2PP1BP1/1B1N1P1P/3QR1K1 w - - 0 18", "prompt": "FEN: 5rk1/2p1qp2/1bnp1n1p/1p2p1p1/1P2P3/2PP1BP1/1B1N1P1P/3QR1K1 w - - 0 18\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=d1; rook=e1; bishop=b2,f3; knight=d2; pawn=f2,h2,c3,d3,g3,b4,e4 | black king=g8; queen=e7; rook=f8; bishop=b6; knight=c6,f6; pawn=b5,e5,g5,d6,h6,c7,f7\nCounts: white king=1; queen=1; rook=1; bishop=2; knight=1; pawn=7 | black king=1; queen=1; rook=1; bishop=1; knight=2; pawn=7\nValues: white total=30; black total=30\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00341", "split": "perception", "task_type": "multi_state_tracking", "fen": "r1b2rk1/6pp/1qpp4/pp2pP2/6n1/P2PPN2/NPP1Q1PP/4RRK1 b - - 0 16", "prompt": "Starting FEN: r1b2rk1/6pp/1qpp4/pp2pP2/6n1/P2PPN2/NPP1Q1PP/4RRK1 b - - 0 16\nAfter the moves b6b8 b2b4 f8d8, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 16\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rqbr2k1/6pp/2pp4/pp2pP2/1P4n1/P2PPN2/N1P1Q1PP/4RRK1 w - - 1 18", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "b6b8 b2b4 f8d8", "_multi_state_tracking_result": "rqbr2k1/6pp/2pp4/pp2pP2/1P4n1/P2PPN2/N1P1Q1PP/4RRK1 w - - 1 18", "diagnostic": true, "hard_gate": false, "moves": "b6b8 b2b4 f8d8"}} {"example_id": "perception_00342", "split": "perception", "task_type": "board_print", "fen": "1r4k1/2r5/1p2p1p1/p1qn1n2/P4PQ1/1P3NP1/5P1P/3RR1K1 b - -", "prompt": "Position (FEN): 1r4k1/2r5/1p2p1p1/p1qn1n2/P4PQ1/1P3NP1/5P1P/3RR1K1 b - -\nShow me the board.", "gold_answer": "8 . r . . . . k .\n7 . . r . . . . .\n6 . p . . p . p .\n5 p . q n . n . .\n4 P . . . . P Q .\n3 . P . . . N P .\n2 . . . . . P . P\n1 . . . R R . K .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00343", "split": "perception", "task_type": "board_to_fen", "fen": "6q1/8/5Q1k/2r5/4p3/4P1PP/5PK1/8 b - -", "prompt": "Here is the current board:\n8 . . . . . . q .\n7 . . . . . . . .\n6 . . . . . Q . k\n5 . . r . . . . .\n4 . . . . p . . .\n3 . . . . P . P P\n2 . . . . . P K .\n1 . . . . . . . .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "6q1/8/5Q1k/2r5/4p3/4P1PP/5PK1/8 b - - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00344", "split": "perception", "task_type": "piece_id", "fen": "4r1k1/pp1b1p1p/1n4p1/2pPr1q1/4PQ2/2N2P1P/PP2B3/2K1R2R w - -", "prompt": "FEN: 4r1k1/pp1b1p1p/1n4p1/2pPr1q1/4PQ2/2N2P1P/PP2B3/2K1R2R w - -\nWhat piece is on h1?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white rook", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "h1"}} {"example_id": "perception_00345", "split": "perception", "task_type": "material_count", "fen": "rn2kr2/1b2b1pp/p2p1q2/1p1p4/P1p5/2NB1P2/1PP3PP/R1BQR1K1 w q - 0 16", "prompt": "FEN: rn2kr2/1b2b1pp/p2p1q2/1p1p4/P1p5/2NB1P2/1PP3PP/R1BQR1K1 w q - 0 16\nWhat is the material count for both sides?", "gold_answer": "White (13 pieces): 2 bishops, 1 king, 1 knight, 6 pawns, 1 queen, 2 rooks. Black (14 pieces): 2 bishops, 1 king, 1 knight, 7 pawns, 1 queen, 2 rooks. Black is up 1 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00346", "split": "perception", "task_type": "square_lookup", "fen": "r5k1/2p4p/p5p1/1p3p2/1P6/P1qB1NP1/5K1P/8 w - - 0 33", "prompt": "FEN: r5k1/2p4p/p5p1/1p3p2/1P6/P1qB1NP1/5K1P/8 w - - 0 33\nWhat is on a4?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "a4=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "a4", "diagnostic": true, "hard_gate": false, "square": "a4"}} {"example_id": "perception_00347", "split": "perception", "task_type": "rank_lookup", "fen": "r1bqk1nr/pp2ppbp/2np2p1/8/2P1P2Q/2N1B3/PP3PPP/R3KBNR b KQkq - 1 7", "prompt": "FEN: r1bqk1nr/pp2ppbp/2np2p1/8/2P1P2Q/2N1B3/PP3PPP/R3KBNR b KQkq - 1 7\nWhat is the compressed FEN row for rank 1?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 1: R3KBNR", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "1", "_rank_lookup_row": "R3KBNR", "diagnostic": true, "hard_gate": false, "rank": "1", "fen_rank_row": "R3KBNR"}} {"example_id": "perception_00348", "split": "perception", "task_type": "square_coordinates", "fen": "r3k1nr/pppb1ppp/8/8/2Bn3q/6N1/PP3PPP/R1BQK2R b KQkq - 1 12", "prompt": "FEN: r3k1nr/pppb1ppp/8/8/2Bn3q/6N1/PP3PPP/R1BQK2R b KQkq - 1 12\nFor square h8, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "h8: file=h; rank=8; fen_row_from_top=1; file_index=8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "h8", "diagnostic": true, "hard_gate": false, "square": "h8"}} {"example_id": "perception_00349", "split": "perception", "task_type": "fen_rank_expansion", "fen": "1k1rR3/pp3p2/n1p2q1p/3p1Pp1/3P4/P1N4Q/1PP3PP/2K5 w - - 3 26", "prompt": "FEN: 1k1rR3/pp3p2/n1p2q1p/3p1Pp1/3P4/P1N4Q/1PP3PP/2K5 w - - 3 26\nCompressed rank 3 row: P1N4Q\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 3: a=P; b=1; c=N; d=1; e=1; f=1; g=1; h=Q", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "3", "_fen_rank_expansion_row": "P1N4Q", "diagnostic": true, "hard_gate": false, "rank": "3", "fen_rank_row": "P1N4Q"}} {"example_id": "perception_00350", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "4rr1k/pp2b2p/2p5/4Pq2/2Q3P1/PP3p1P/1B3P2/2R1R1K1 b - - 0 28", "prompt": "Rank 5 row before: 4Pq2\nFile f changes from q to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 5: 4Pq2 -> 4P3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "f5c8", "_fen_rank_cell_edit_square": "f5", "_fen_rank_cell_edit_rank": "5", "_fen_rank_cell_edit_file": "f", "_fen_rank_cell_edit_before_row": "4Pq2", "_fen_rank_cell_edit_after_row": "4P3", "_fen_rank_cell_edit_before_fen": "q", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "f5c8", "square": "f5", "rank": "5", "file": "f", "before_row": "4Pq2", "after_row": "4P3", "before_fen": "q", "after_fen": "1"}} {"example_id": "perception_00351", "split": "perception", "task_type": "fen_board_edit", "fen": "2b3rk/ppb4p/2p1p1q1/2Pn4/1P1PRp2/P4Q1P/1B3PP1/4R1K1 b - - 4 29", "prompt": "Board FEN before: 2b3rk/ppb4p/2p1p1q1/2Pn4/1P1PRp2/P4Q1P/1B3PP1/4R1K1\nApply square edits: d5 n->1; e3 1->n\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 2b3rk/ppb4p/2p1p1q1/2P5/1P1PRp2/P3nQ1P/1B3PP1/4R1K1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "d5e3", "_fen_board_edit_board_fen_before": "2b3rk/ppb4p/2p1p1q1/2Pn4/1P1PRp2/P4Q1P/1B3PP1/4R1K1", "_fen_board_edit_board_fen_after": "2b3rk/ppb4p/2p1p1q1/2P5/1P1PRp2/P3nQ1P/1B3PP1/4R1K1", "_fen_board_edit_edit_text": "d5 n->1; e3 1->n", "_fen_board_edit_changed_squares": [{"square": "d5", "before": "black knight", "after": "empty", "before_fen": "n", "after_fen": "1"}, {"square": "e3", "before": "empty", "after": "black knight", "before_fen": "1", "after_fen": "n"}], "diagnostic": true, "hard_gate": false, "move": "d5e3", "board_fen_before": "2b3rk/ppb4p/2p1p1q1/2Pn4/1P1PRp2/P4Q1P/1B3PP1/4R1K1", "board_fen_after": "2b3rk/ppb4p/2p1p1q1/2P5/1P1PRp2/P3nQ1P/1B3PP1/4R1K1", "edit_text": "d5 n->1; e3 1->n", "changed_squares": [{"square": "d5", "before": "black knight", "after": "empty", "before_fen": "n", "after_fen": "1"}, {"square": "e3", "before": "empty", "after": "black knight", "before_fen": "1", "after_fen": "n"}]}} {"example_id": "perception_00352", "split": "perception", "task_type": "move_square_edits", "fen": "1nr3k1/6p1/4R2p/3pPp2/2p2P2/B3QN1P/2q3P1/6K1 b - - 0 31", "prompt": "Starting FEN: 1nr3k1/6p1/4R2p/3pPp2/2p2P2/B3QN1P/2q3P1/6K1 b - - 0 31\nMove: c2g2\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: c2=black queen; g2=white pawn.\nSquares: c2 black queen->empty; g2 white pawn->black queen.\nRanks: rank 2 c q->1; rank 2 g P->q.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "c2g2", "diagnostic": true, "hard_gate": false, "move": "c2g2"}} {"example_id": "perception_00353", "split": "perception", "task_type": "fen_assembly", "fen": "r1bqkbnr/pp1p1ppp/4p3/n7/2B1P3/2N2N2/PP3PPP/R1BQK2R w KQkq -", "prompt": "Starting FEN: r1bqkbnr/pp1p1ppp/4p3/n7/2B1P3/2N2N2/PP3PPP/R1BQK2R w KQkq - 0 1\nMove: a2a3\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white pawn a2a3.\nLookup: a2=white pawn; a3=empty.\nSquares: a2 white pawn->empty; a3 empty->white pawn.\nRanks: rank 2 a P->1; rank 3 a 1->P.\nResult FEN: r1bqkbnr/pp1p1ppp/4p3/n7/2B1P3/P1N2N2/1P3PPP/R1BQK2R b KQkq - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "a2a3", "diagnostic": true, "hard_gate": false, "move": "a2a3"}} {"example_id": "perception_00354", "split": "perception", "task_type": "fen_row_application", "fen": "r1bqk1nr/pp1n1ppp/2p5/2b1p3/2B1P3/5N2/PPP2PPP/RNBQK2R w KQkq - 2 7", "prompt": "Starting FEN: r1bqk1nr/pp1n1ppp/2p5/2b1p3/2B1P3/5N2/PPP2PPP/RNBQK2R w KQkq - 2 7\nMove: c1h6\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 2\nFullmove number: 7\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 1 RNBQK2R->RN1QK2R; rank 6 2p5->2p4B.\nResult FEN: r1bqk1nr/pp1n1ppp/2p4B/2b1p3/2B1P3/5N2/PPP2PPP/RN1QK2R b KQkq - 3 7", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "c1h6", "_fen_row_application_rank_rewrites": [{"rank": "1", "before": "RNBQK2R", "after": "RN1QK2R"}, {"rank": "6", "before": "2p5", "after": "2p4B"}], "diagnostic": true, "hard_gate": false, "move": "c1h6", "rank_rewrites": [{"rank": "1", "before": "RNBQK2R", "after": "RN1QK2R"}, {"rank": "6", "before": "2p5", "after": "2p4B"}]}} {"example_id": "perception_00355", "split": "perception", "task_type": "state_tracking", "fen": "4r1k1/pp3ppp/2p2pn1/3p4/3P2R1/2PQ1P1P/PPBqrP2/1K5R w - - 6 20", "prompt": "Starting FEN: 4r1k1/pp3ppp/2p2pn1/3p4/3P2R1/2PQ1P1P/PPBqrP2/1K5R w - - 6 20\nAfter the moves g4g1, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 6\nFullmove number: 20\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 4r1k1/pp3ppp/2p2pn1/3p4/3P4/2PQ1P1P/PPBqrP2/1K4RR b - - 7 20", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "g4g1", "_state_tracking_result": "4r1k1/pp3ppp/2p2pn1/3p4/3P4/2PQ1P1P/PPBqrP2/1K4RR b - - 7 20"}} {"example_id": "perception_00356", "split": "perception", "task_type": "material_inventory", "fen": "7k/p5rp/1p1P1Q2/5p2/q4P2/P3R2P/6PK/7r w - -", "prompt": "FEN: 7k/p5rp/1p1P1Q2/5p2/q4P2/P3R2P/6PK/7r w - -\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=h2; queen=f6; rook=e3; bishop=none; knight=none; pawn=g2,a3,h3,f4,d6.\nBlack inventory: king=h8; queen=a4; rook=h1,g7; bishop=none; knight=none; pawn=f5,b6,a7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00357", "split": "perception", "task_type": "material_piece_counts", "fen": "rnbq1rk1/ppp1bppp/3p1n2/8/8/2NB1N2/PPPP1PPP/R1BQ1RK1 w - -", "prompt": "FEN: rnbq1rk1/ppp1bppp/3p1n2/8/8/2NB1N2/PPPP1PPP/R1BQ1RK1 w - -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7.\nBlack counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00358", "split": "perception", "task_type": "material_value_totals", "fen": "1k6/8/2Q1K3/8/4B3/8/8/8 w - -", "prompt": "FEN: 1k6/8/2Q1K3/8/4B3/8/8/8 w - -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=0; bishop=3; knight=0; pawn=0; total=12.\nBlack values: king=0; queen=0; rook=0; bishop=0; knight=0; pawn=0; total=0.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00359", "split": "perception", "task_type": "material_balance_trace", "fen": "r3r1k1/pp2qpp1/8/2p5/4bB1b/1P1B3P/P1P2PPQ/3RR1K1 b - - 8 22", "prompt": "FEN: r3r1k1/pp2qpp1/8/2p5/4bB1b/1P1B3P/P1P2PPQ/3RR1K1 b - - 8 22\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=h2; rook=d1,e1; bishop=d3,f4; knight=none; pawn=a2,c2,f2,g2,b3,h3 | black king=g8; queen=e7; rook=a8,e8; bishop=e4,h4; knight=none; pawn=c5,a7,b7,f7,g7\nCounts: white king=1; queen=1; rook=2; bishop=2; knight=0; pawn=6 | black king=1; queen=1; rook=2; bishop=2; knight=0; pawn=5\nValues: white total=31; black total=30\nBalance: White is up 1 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00360", "split": "perception", "task_type": "multi_state_tracking", "fen": "2k5/1pp1R2p/1q6/1N1ppp2/Q3b3/1r1PNB2/1P1KP1r1/R1B5 b - -", "prompt": "Starting FEN: 2k5/1pp1R2p/1q6/1N1ppp2/Q3b3/1r1PNB2/1P1KP1r1/R1B5 b - - 0 1\nAfter the moves b6a6 e3d1, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 2k5/1pp1R2p/q7/1N1ppp2/Q3b3/1r1P1B2/1P1KP1r1/R1BN4 b - - 2 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "b6a6 e3d1", "_multi_state_tracking_result": "2k5/1pp1R2p/q7/1N1ppp2/Q3b3/1r1P1B2/1P1KP1r1/R1BN4 b - - 2 2", "diagnostic": true, "hard_gate": false, "moves": "b6a6 e3d1"}} {"example_id": "perception_00361", "split": "perception", "task_type": "board_print", "fen": "r2qkbnr/p1pb1ppp/3p4/2p5/4P3/5N2/PPP2PPP/RNBQ1RK1 b kq - 1 8", "prompt": "Position (FEN): r2qkbnr/p1pb1ppp/3p4/2p5/4P3/5N2/PPP2PPP/RNBQ1RK1 b kq - 1 8\nShow me the board.", "gold_answer": "8 r . . q k b n r\n7 p . p b . p p p\n6 . . . p . . . .\n5 . . p . . . . .\n4 . . . . P . . .\n3 . . . . . N . .\n2 P P P . . P P P\n1 R N B Q . R K .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00362", "split": "perception", "task_type": "board_to_fen", "fen": "2rq1r2/4b1pk/1p2p2p/2p1N3/3PQBP1/4P3/PP3P1P/2R2RK1 b - - 2 24", "prompt": "Here is the current board:\n8 . . r q . r . .\n7 . . . . b . p k\n6 . p . . p . . p\n5 . . p . N . . .\n4 . . . P Q B P .\n3 . . . . P . . .\n2 P P . . . P . P\n1 . . R . . R K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 2\nFullmove number: 24\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "2rq1r2/4b1pk/1p2p2p/2p1N3/3PQBP1/4P3/PP3P1P/2R2RK1 b - - 2 24", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00363", "split": "perception", "task_type": "piece_id", "fen": "7Q/2k5/p7/2p2p2/8/3BK3/PPP5/8 b - - 0 39", "prompt": "FEN: 7Q/2k5/p7/2p2p2/8/3BK3/PPP5/8 b - - 0 39\nWhat piece is on a2?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "a2"}} {"example_id": "perception_00364", "split": "perception", "task_type": "material_count", "fen": "3r4/3kbp1p/bp4p1/p1p5/2P1P3/1P6/3P1P2/1NBK1B1R w - - 0 27", "prompt": "FEN: 3r4/3kbp1p/bp4p1/p1p5/2P1P3/1P6/3P1P2/1NBK1B1R w - - 0 27\nWhat is the material count for both sides?", "gold_answer": "White (10 pieces): 2 bishops, 1 king, 1 knight, 5 pawns, 1 rook. Black (10 pieces): 2 bishops, 1 king, 6 pawns, 1 rook. White is up 2 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00365", "split": "perception", "task_type": "square_lookup", "fen": "r2qk2r/1pp2pp1/pbnp1n1p/7b/P1BPP3/4BN1P/1P1N1PP1/R2Q1RK1 w kq - 1 12", "prompt": "FEN: r2qk2r/1pp2pp1/pbnp1n1p/7b/P1BPP3/4BN1P/1P1N1PP1/R2Q1RK1 w kq - 1 12\nWhat is on b3?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "b3=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "b3", "diagnostic": true, "hard_gate": false, "square": "b3"}} {"example_id": "perception_00366", "split": "perception", "task_type": "rank_lookup", "fen": "rnbqkbnr/pp1p1pp1/2p1p2p/7Q/2B1P3/5N2/PPPP1PPP/RNB1K2R b KQkq - 1 4", "prompt": "FEN: rnbqkbnr/pp1p1pp1/2p1p2p/7Q/2B1P3/5N2/PPPP1PPP/RNB1K2R b KQkq - 1 4\nWhat is the compressed FEN row for rank 7?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 7: pp1p1pp1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "7", "_rank_lookup_row": "pp1p1pp1", "diagnostic": true, "hard_gate": false, "rank": "7", "fen_rank_row": "pp1p1pp1"}} {"example_id": "perception_00367", "split": "perception", "task_type": "square_coordinates", "fen": "5rk1/3bqpb1/Nr1ppnp1/np5p/8/P1NPP1P1/3BQPBP/1R3RK1 w - -", "prompt": "FEN: 5rk1/3bqpb1/Nr1ppnp1/np5p/8/P1NPP1P1/3BQPBP/1R3RK1 w - -\nFor square c3, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "c3: file=c; rank=3; fen_row_from_top=6; file_index=3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "c3", "diagnostic": true, "hard_gate": false, "square": "c3"}} {"example_id": "perception_00368", "split": "perception", "task_type": "fen_rank_expansion", "fen": "rnbqkbnr/2p2ppp/pp2p3/2Pp4/PP1P4/8/4PPPP/RNBQKBNR b KQkq - 0 5", "prompt": "FEN: rnbqkbnr/2p2ppp/pp2p3/2Pp4/PP1P4/8/4PPPP/RNBQKBNR b KQkq - 0 5\nCompressed rank 6 row: pp2p3\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 6: a=p; b=p; c=1; d=1; e=p; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "6", "_fen_rank_expansion_row": "pp2p3", "diagnostic": true, "hard_gate": false, "rank": "6", "fen_rank_row": "pp2p3"}} {"example_id": "perception_00369", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "3Rk2r/5ppp/pq2p3/1p2P3/6Q1/1P2b3/1P3PPP/R5K1 b k -", "prompt": "Rank 8 row before: 3Rk2r\nFile d changes from R to k. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 8: 3Rk2r -> 3k3r", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "e8d8", "_fen_rank_cell_edit_square": "d8", "_fen_rank_cell_edit_rank": "8", "_fen_rank_cell_edit_file": "d", "_fen_rank_cell_edit_before_row": "3Rk2r", "_fen_rank_cell_edit_after_row": "3k3r", "_fen_rank_cell_edit_before_fen": "R", "_fen_rank_cell_edit_after_fen": "k", "diagnostic": true, "hard_gate": false, "move": "e8d8", "square": "d8", "rank": "8", "file": "d", "before_row": "3Rk2r", "after_row": "3k3r", "before_fen": "R", "after_fen": "k"}} {"example_id": "perception_00370", "split": "perception", "task_type": "fen_board_edit", "fen": "r1b2rk1/1p2b1pp/1q2pp2/3pP3/p2N4/2PQ4/PP3PPP/R1B1R1K1 w - - 0 17", "prompt": "Board FEN before: r1b2rk1/1p2b1pp/1q2pp2/3pP3/p2N4/2PQ4/PP3PPP/R1B1R1K1\nApply square edits: d3 Q->1; e4 1->Q\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: r1b2rk1/1p2b1pp/1q2pp2/3pP3/p2NQ3/2P5/PP3PPP/R1B1R1K1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "d3e4", "_fen_board_edit_board_fen_before": "r1b2rk1/1p2b1pp/1q2pp2/3pP3/p2N4/2PQ4/PP3PPP/R1B1R1K1", "_fen_board_edit_board_fen_after": "r1b2rk1/1p2b1pp/1q2pp2/3pP3/p2NQ3/2P5/PP3PPP/R1B1R1K1", "_fen_board_edit_edit_text": "d3 Q->1; e4 1->Q", "_fen_board_edit_changed_squares": [{"square": "d3", "before": "white queen", "after": "empty", "before_fen": "Q", "after_fen": "1"}, {"square": "e4", "before": "empty", "after": "white queen", "before_fen": "1", "after_fen": "Q"}], "diagnostic": true, "hard_gate": false, "move": "d3e4", "board_fen_before": "r1b2rk1/1p2b1pp/1q2pp2/3pP3/p2N4/2PQ4/PP3PPP/R1B1R1K1", "board_fen_after": "r1b2rk1/1p2b1pp/1q2pp2/3pP3/p2NQ3/2P5/PP3PPP/R1B1R1K1", "edit_text": "d3 Q->1; e4 1->Q", "changed_squares": [{"square": "d3", "before": "white queen", "after": "empty", "before_fen": "Q", "after_fen": "1"}, {"square": "e4", "before": "empty", "after": "white queen", "before_fen": "1", "after_fen": "Q"}]}} {"example_id": "perception_00371", "split": "perception", "task_type": "move_square_edits", "fen": "r1bqk2r/p4ppp/2pp1n2/2b1p3/2P1P3/2NB4/PP3PPP/R1BQ1RK1 w kq -", "prompt": "Starting FEN: r1bqk2r/p4ppp/2pp1n2/2b1p3/2P1P3/2NB4/PP3PPP/R1BQ1RK1 w kq -\nMove: d1e2\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: d1=white queen; e2=empty.\nSquares: d1 white queen->empty; e2 empty->white queen.\nRanks: rank 1 d Q->1; rank 2 e 1->Q.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "d1e2", "diagnostic": true, "hard_gate": false, "move": "d1e2"}} {"example_id": "perception_00372", "split": "perception", "task_type": "fen_assembly", "fen": "6k1/1p3pp1/p1p2q1p/2P1r3/1P1p4/P2P3P/4QPP1/R5K1 w - - 2 25", "prompt": "Starting FEN: 6k1/1p3pp1/p1p2q1p/2P1r3/1P1p4/P2P3P/4QPP1/R5K1 w - - 2 25\nMove: a1b1\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 2\nFullmove number: 25\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white rook a1b1.\nLookup: a1=white rook; b1=empty.\nSquares: a1 white rook->empty; b1 empty->white rook.\nRanks: rank 1 a R->1; rank 1 b 1->R.\nResult FEN: 6k1/1p3pp1/p1p2q1p/2P1r3/1P1p4/P2P3P/4QPP1/1R4K1 b - - 3 25", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "a1b1", "diagnostic": true, "hard_gate": false, "move": "a1b1"}} {"example_id": "perception_00373", "split": "perception", "task_type": "fen_row_application", "fen": "8/8/6R1/7p/Pp5P/6Pk/1P1pKP2/2rR4 b - - 2 36", "prompt": "Starting FEN: 8/8/6R1/7p/Pp5P/6Pk/1P1pKP2/2rR4 b - - 2 36\nMove: h3g2\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 2\nFullmove number: 36\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 3 6Pk->6P1; rank 2 1P1pKP2->1P1pKPk1.\nResult FEN: 8/8/6R1/7p/Pp5P/6P1/1P1pKPk1/2rR4 w - - 3 37", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "h3g2", "_fen_row_application_rank_rewrites": [{"rank": "3", "before": "6Pk", "after": "6P1"}, {"rank": "2", "before": "1P1pKP2", "after": "1P1pKPk1"}], "diagnostic": true, "hard_gate": false, "move": "h3g2", "rank_rewrites": [{"rank": "3", "before": "6Pk", "after": "6P1"}, {"rank": "2", "before": "1P1pKP2", "after": "1P1pKPk1"}]}} {"example_id": "perception_00374", "split": "perception", "task_type": "state_tracking", "fen": "r3kb1r/1p1b2pp/pq2pp1n/n1p5/2P1PB2/2NP1N2/PP1Q1PPP/R3K2R w KQkq - 0 12", "prompt": "Starting FEN: r3kb1r/1p1b2pp/pq2pp1n/n1p5/2P1PB2/2NP1N2/PP1Q1PPP/R3K2R w KQkq - 0 12\nAfter the moves d3d4, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 12\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r3kb1r/1p1b2pp/pq2pp1n/n1p5/2PPPB2/2N2N2/PP1Q1PPP/R3K2R b KQkq - 0 12", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "d3d4", "_state_tracking_result": "r3kb1r/1p1b2pp/pq2pp1n/n1p5/2PPPB2/2N2N2/PP1Q1PPP/R3K2R b KQkq - 0 12"}} {"example_id": "perception_00375", "split": "perception", "task_type": "material_inventory", "fen": "rnbqkb1r/ppp2ppp/4p3/3n4/2PP4/5N2/PP3PPP/RNBQKB1R b KQkq - 0 5", "prompt": "FEN: rnbqkb1r/ppp2ppp/4p3/3n4/2PP4/5N2/PP3PPP/RNBQKB1R b KQkq - 0 5\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=e1; queen=d1; rook=a1,h1; bishop=c1,f1; knight=b1,f3; pawn=a2,b2,f2,g2,h2,c4,d4.\nBlack inventory: king=e8; queen=d8; rook=a8,h8; bishop=c8,f8; knight=d5,b8; pawn=e6,a7,b7,c7,f7,g7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00376", "split": "perception", "task_type": "material_piece_counts", "fen": "6r1/7k/4K3/8/8/8/8/6Q1 w - -", "prompt": "FEN: 6r1/7k/4K3/8/8/8/8/6Q1 w - -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=0; bishop=0; knight=0; pawn=0.\nBlack counts: king=1; queen=0; rook=1; bishop=0; knight=0; pawn=0.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00377", "split": "perception", "task_type": "material_value_totals", "fen": "rn1qkb1r/pp3ppp/4bn2/2p5/2P5/2N5/PP1P1PPP/R1BQKBNR b KQkq -", "prompt": "FEN: rn1qkb1r/pp3ppp/4bn2/2p5/2P5/2N5/PP1P1PPP/R1BQKBNR b KQkq -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=7; total=38.\nBlack values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=6; total=37.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00378", "split": "perception", "task_type": "material_balance_trace", "fen": "rnbq1rk1/pp2ppbp/3p2p1/2p3N1/2B1P3/2PP1Q2/PP3PPP/RN2K2R b KQ - 3 9", "prompt": "FEN: rnbq1rk1/pp2ppbp/3p2p1/2p3N1/2B1P3/2PP1Q2/PP3PPP/RN2K2R b KQ - 3 9\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=e1; queen=f3; rook=a1,h1; bishop=c4; knight=b1,g5; pawn=a2,b2,f2,g2,h2,c3,d3,e4 | black king=g8; queen=d8; rook=a8,f8; bishop=g7,c8; knight=b8; pawn=c5,d6,g6,a7,b7,e7,f7,h7\nCounts: white king=1; queen=1; rook=2; bishop=1; knight=2; pawn=8 | black king=1; queen=1; rook=2; bishop=2; knight=1; pawn=8\nValues: white total=36; black total=36\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00379", "split": "perception", "task_type": "multi_state_tracking", "fen": "2rq1rk1/p2bppb1/3p1np1/1p2n2p/4P2P/1BN1BP2/PPPQN1P1/2KR3R w - -", "prompt": "Starting FEN: 2rq1rk1/p2bppb1/3p1np1/1p2n2p/4P2P/1BN1BP2/PPPQN1P1/2KR3R w - - 0 1\nAfter the moves g2g4 c8c7 b3d5, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 3q1rk1/p1rbppb1/3p1np1/1p1Bn2p/4P1PP/2N1BP2/PPPQN3/2KR3R b - - 2 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "g2g4 c8c7 b3d5", "_multi_state_tracking_result": "3q1rk1/p1rbppb1/3p1np1/1p1Bn2p/4P1PP/2N1BP2/PPPQN3/2KR3R b - - 2 2", "diagnostic": true, "hard_gate": false, "moves": "g2g4 c8c7 b3d5"}} {"example_id": "perception_00380", "split": "perception", "task_type": "board_print", "fen": "r1b2rk1/pp2ppbp/2N2np1/8/4p3/2N2P2/PPPBB1PP/2KR3R b - -", "prompt": "Position (FEN): r1b2rk1/pp2ppbp/2N2np1/8/4p3/2N2P2/PPPBB1PP/2KR3R b - -\nShow me the board.", "gold_answer": "8 r . b . . r k .\n7 p p . . p p b p\n6 . . N . . n p .\n5 . . . . . . . .\n4 . . . . p . . .\n3 . . N . . P . .\n2 P P P B B . P P\n1 . . K R . . . R\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00381", "split": "perception", "task_type": "board_to_fen", "fen": "r1b1kbnN/p2n2p1/1p5p/2pB4/3pPq2/8/PPP2PPP/RN1QK2R w KQq - 0 10", "prompt": "Here is the current board:\n8 r . b . k b n N\n7 p . . n . . p .\n6 . p . . . . . p\n5 . . p B . . . .\n4 . . . p P q . .\n3 . . . . . . . .\n2 P P P . . P P P\n1 R N . Q K . . R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 10\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r1b1kbnN/p2n2p1/1p5p/2pB4/3pPq2/8/PPP2PPP/RN1QK2R w KQq - 0 10", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00382", "split": "perception", "task_type": "piece_id", "fen": "8/1b1kq3/3rprp1/1B1pQ2p/p2P1P2/P1P3P1/1P1R3P/2K1R3 b - - 0 30", "prompt": "FEN: 8/1b1kq3/3rprp1/1B1pQ2p/p2P1P2/P1P3P1/1P1R3P/2K1R3 b - - 0 30\nWhat piece is on a3?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "a3"}} {"example_id": "perception_00383", "split": "perception", "task_type": "material_count", "fen": "2k2N2/ppp5/3p1pp1/7p/3n4/1P4PK/P3r2P/R7 b - - 7 30", "prompt": "FEN: 2k2N2/ppp5/3p1pp1/7p/3n4/1P4PK/P3r2P/R7 b - - 7 30\nWhat is the material count for both sides?", "gold_answer": "White (7 pieces): 1 king, 1 knight, 4 pawns, 1 rook. Black (10 pieces): 1 king, 1 knight, 7 pawns, 1 rook. Black is up 3 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00384", "split": "perception", "task_type": "square_lookup", "fen": "2r5/p3k1pp/1p6/3B3b/2PP4/7P/P4PP1/1R2K2R b K - 0 22", "prompt": "FEN: 2r5/p3k1pp/1p6/3B3b/2PP4/7P/P4PP1/1R2K2R b K - 0 22\nWhat is on b3?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "b3=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "b3", "diagnostic": true, "hard_gate": false, "square": "b3"}} {"example_id": "perception_00385", "split": "perception", "task_type": "rank_lookup", "fen": "r1bqk2r/pp2bppp/2n2n2/2pp4/8/2NP1NP1/PP2PPBP/R1BQK2R w KQkq -", "prompt": "FEN: r1bqk2r/pp2bppp/2n2n2/2pp4/8/2NP1NP1/PP2PPBP/R1BQK2R w KQkq -\nWhat is the compressed FEN row for rank 7?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 7: pp2bppp", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "7", "_rank_lookup_row": "pp2bppp", "diagnostic": true, "hard_gate": false, "rank": "7", "fen_rank_row": "pp2bppp"}} {"example_id": "perception_00386", "split": "perception", "task_type": "square_coordinates", "fen": "4r1k1/r4b2/p2Q4/np3P2/4P3/1P5P/PP4P1/5RK1 b - -", "prompt": "FEN: 4r1k1/r4b2/p2Q4/np3P2/4P3/1P5P/PP4P1/5RK1 b - -\nFor square f5, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "f5: file=f; rank=5; fen_row_from_top=4; file_index=6", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "f5", "diagnostic": true, "hard_gate": false, "square": "f5"}} {"example_id": "perception_00387", "split": "perception", "task_type": "fen_rank_expansion", "fen": "2rqr1k1/pp2pp1p/4b1p1/3N4/3QP3/1P3P2/P5PP/R4RK1 w - -", "prompt": "FEN: 2rqr1k1/pp2pp1p/4b1p1/3N4/3QP3/1P3P2/P5PP/R4RK1 w - -\nCompressed rank 7 row: pp2pp1p\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 7: a=p; b=p; c=1; d=1; e=p; f=p; g=1; h=p", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "7", "_fen_rank_expansion_row": "pp2pp1p", "diagnostic": true, "hard_gate": false, "rank": "7", "fen_rank_row": "pp2pp1p"}} {"example_id": "perception_00388", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "2k4r/p1p2p2/1p3p2/7p/1P6/6P1/P1q2b1P/1R3RK1 w - - 0 21", "prompt": "Rank 1 row before: 1R3RK1\nFile f changes from R to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 1: 1R3RK1 -> 1R4K1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "f1f2", "_fen_rank_cell_edit_square": "f1", "_fen_rank_cell_edit_rank": "1", "_fen_rank_cell_edit_file": "f", "_fen_rank_cell_edit_before_row": "1R3RK1", "_fen_rank_cell_edit_after_row": "1R4K1", "_fen_rank_cell_edit_before_fen": "R", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "f1f2", "square": "f1", "rank": "1", "file": "f", "before_row": "1R3RK1", "after_row": "1R4K1", "before_fen": "R", "after_fen": "1"}} {"example_id": "perception_00389", "split": "perception", "task_type": "fen_board_edit", "fen": "7k/6p1/Q4p1p/2P5/8/1P3R1P/1r2r1P1/5R1K w - - 1 30", "prompt": "Board FEN before: 7k/6p1/Q4p1p/2P5/8/1P3R1P/1r2r1P1/5R1K\nApply square edits: a6 Q->1; a1 1->Q\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 7k/6p1/5p1p/2P5/8/1P3R1P/1r2r1P1/Q4R1K", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "a6a1", "_fen_board_edit_board_fen_before": "7k/6p1/Q4p1p/2P5/8/1P3R1P/1r2r1P1/5R1K", "_fen_board_edit_board_fen_after": "7k/6p1/5p1p/2P5/8/1P3R1P/1r2r1P1/Q4R1K", "_fen_board_edit_edit_text": "a6 Q->1; a1 1->Q", "_fen_board_edit_changed_squares": [{"square": "a6", "before": "white queen", "after": "empty", "before_fen": "Q", "after_fen": "1"}, {"square": "a1", "before": "empty", "after": "white queen", "before_fen": "1", "after_fen": "Q"}], "diagnostic": true, "hard_gate": false, "move": "a6a1", "board_fen_before": "7k/6p1/Q4p1p/2P5/8/1P3R1P/1r2r1P1/5R1K", "board_fen_after": "7k/6p1/5p1p/2P5/8/1P3R1P/1r2r1P1/Q4R1K", "edit_text": "a6 Q->1; a1 1->Q", "changed_squares": [{"square": "a6", "before": "white queen", "after": "empty", "before_fen": "Q", "after_fen": "1"}, {"square": "a1", "before": "empty", "after": "white queen", "before_fen": "1", "after_fen": "Q"}]}} {"example_id": "perception_00390", "split": "perception", "task_type": "move_square_edits", "fen": "r1bq1rk1/p3ppbp/2pp1np1/2p5/4P3/2PP1N1P/PPQ2PP1/RNB2RK1 b - -", "prompt": "Starting FEN: r1bq1rk1/p3ppbp/2pp1np1/2p5/4P3/2PP1N1P/PPQ2PP1/RNB2RK1 b - -\nMove: c8a6\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: c8=black bishop; a6=empty.\nSquares: c8 black bishop->empty; a6 empty->black bishop.\nRanks: rank 8 c b->1; rank 6 a 1->b.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "c8a6", "diagnostic": true, "hard_gate": false, "move": "c8a6"}} {"example_id": "perception_00391", "split": "perception", "task_type": "fen_assembly", "fen": "r2q1rk1/1pp1bppp/p1n1pn2/2Pp4/1P1P4/P3PN2/4BPPP/1RBQ1RK1 b - - 4 10", "prompt": "Starting FEN: r2q1rk1/1pp1bppp/p1n1pn2/2Pp4/1P1P4/P3PN2/4BPPP/1RBQ1RK1 b - - 4 10\nMove: b7b6\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 4\nFullmove number: 10\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black pawn b7b6.\nLookup: b7=black pawn; b6=empty.\nSquares: b7 black pawn->empty; b6 empty->black pawn.\nRanks: rank 7 b p->1; rank 6 b 1->p.\nResult FEN: r2q1rk1/2p1bppp/ppn1pn2/2Pp4/1P1P4/P3PN2/4BPPP/1RBQ1RK1 w - - 0 11", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "b7b6", "diagnostic": true, "hard_gate": false, "move": "b7b6"}} {"example_id": "perception_00392", "split": "perception", "task_type": "fen_row_application", "fen": "r1bqk2r/pp2bppp/2n1pn2/2pp2B1/3P4/5NP1/PPP1PPBP/RN1QR1K1 b kq -", "prompt": "Starting FEN: r1bqk2r/pp2bppp/2n1pn2/2pp2B1/3P4/5NP1/PPP1PPBP/RN1QR1K1 b kq - 0 1\nMove: d8d6\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: kq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 8 r1bqk2r->r1b1k2r; rank 6 2n1pn2->2nqpn2.\nResult FEN: r1b1k2r/pp2bppp/2nqpn2/2pp2B1/3P4/5NP1/PPP1PPBP/RN1QR1K1 w kq - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "d8d6", "_fen_row_application_rank_rewrites": [{"rank": "8", "before": "r1bqk2r", "after": "r1b1k2r"}, {"rank": "6", "before": "2n1pn2", "after": "2nqpn2"}], "diagnostic": true, "hard_gate": false, "move": "d8d6", "rank_rewrites": [{"rank": "8", "before": "r1bqk2r", "after": "r1b1k2r"}, {"rank": "6", "before": "2n1pn2", "after": "2nqpn2"}]}} {"example_id": "perception_00393", "split": "perception", "task_type": "state_tracking", "fen": "8/8/1B6/3k4/2N5/2K5/8/8 b - -", "prompt": "Starting FEN: 8/8/1B6/3k4/2N5/2K5/8/8 b - - 0 1\nAfter the moves d5e6, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 8/8/1B2k3/8/2N5/2K5/8/8 w - - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "d5e6", "_state_tracking_result": "8/8/1B2k3/8/2N5/2K5/8/8 w - - 1 2"}} {"example_id": "perception_00394", "split": "perception", "task_type": "material_inventory", "fen": "r1bq1rk1/pp3pbp/n1pp1np1/4p3/2P1P3/2NP2P1/PP2NPBP/R1BQ1RK1 w - -", "prompt": "FEN: r1bq1rk1/pp3pbp/n1pp1np1/4p3/2P1P3/2NP2P1/PP2NPBP/R1BQ1RK1 w - -\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=d1; rook=a1,f1; bishop=c1,g2; knight=e2,c3; pawn=a2,b2,f2,h2,d3,g3,c4,e4.\nBlack inventory: king=g8; queen=d8; rook=a8,f8; bishop=g7,c8; knight=a6,f6; pawn=e5,c6,d6,g6,a7,b7,f7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00395", "split": "perception", "task_type": "material_piece_counts", "fen": "r2r2k1/ppp2ppp/4B3/4P3/4n3/1P6/P1K2PPP/R6R w - - 1 18", "prompt": "FEN: r2r2k1/ppp2ppp/4B3/4P3/4n3/1P6/P1K2PPP/R6R w - - 1 18\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=2; bishop=1; knight=0; pawn=6.\nBlack counts: king=1; queen=0; rook=2; bishop=0; knight=1; pawn=6.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00396", "split": "perception", "task_type": "material_value_totals", "fen": "2k2b2/1ppr1np1/4p2p/p3p3/1n1pP2P/N2P1P2/PPPB1P2/2KR3R w - - 0 18", "prompt": "FEN: 2k2b2/1ppr1np1/4p2p/p3p3/1n1pP2P/N2P1P2/PPPB1P2/2KR3R w - - 0 18\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=10; bishop=3; knight=3; pawn=8; total=24.\nBlack values: king=0; queen=0; rook=5; bishop=3; knight=6; pawn=8; total=22.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00397", "split": "perception", "task_type": "material_balance_trace", "fen": "r4rk1/1bqnpp1p/1p1p2p1/4n3/1RP1P3/2P1BP2/3NB1PP/3Q1RK1 w - -", "prompt": "FEN: r4rk1/1bqnpp1p/1p1p2p1/4n3/1RP1P3/2P1BP2/3NB1PP/3Q1RK1 w - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=d1; rook=f1,b4; bishop=e2,e3; knight=d2; pawn=g2,h2,c3,f3,c4,e4 | black king=g8; queen=c7; rook=a8,f8; bishop=b7; knight=e5,d7; pawn=b6,d6,g6,e7,f7,h7\nCounts: white king=1; queen=1; rook=2; bishop=2; knight=1; pawn=6 | black king=1; queen=1; rook=2; bishop=1; knight=2; pawn=6\nValues: white total=34; black total=34\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00398", "split": "perception", "task_type": "multi_state_tracking", "fen": "r2qkbnr/ppp2ppp/2npb3/4p3/2B1PP2/5N2/PPPPQ1PP/RNB1K2R b KQkq - 3 5", "prompt": "Starting FEN: r2qkbnr/ppp2ppp/2npb3/4p3/2B1PP2/5N2/PPPPQ1PP/RNB1K2R b KQkq - 3 5\nAfter the moves a8b8 e2d3 b7b6, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 3\nFullmove number: 5\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 1r1qkbnr/p1p2ppp/1pnpb3/4p3/2B1PP2/3Q1N2/PPPP2PP/RNB1K2R w KQk - 0 7", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "a8b8 e2d3 b7b6", "_multi_state_tracking_result": "1r1qkbnr/p1p2ppp/1pnpb3/4p3/2B1PP2/3Q1N2/PPPP2PP/RNB1K2R w KQk - 0 7", "diagnostic": true, "hard_gate": false, "moves": "a8b8 e2d3 b7b6"}} {"example_id": "perception_00399", "split": "perception", "task_type": "board_print", "fen": "r3q1k1/p2br1p1/2p5/3pP1Q1/5P2/P3P1bP/3B2P1/2R2RK1 w - - 1 28", "prompt": "Position (FEN): r3q1k1/p2br1p1/2p5/3pP1Q1/5P2/P3P1bP/3B2P1/2R2RK1 w - - 1 28\nShow me the board.", "gold_answer": "8 r . . . q . k .\n7 p . . b r . p .\n6 . . p . . . . .\n5 . . . p P . Q .\n4 . . . . . P . .\n3 P . . . P . b P\n2 . . . B . . P .\n1 . . R . . R K .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00400", "split": "perception", "task_type": "board_to_fen", "fen": "4rk2/8/1n1Rp2p/4R1p1/4P3/6NP/5PPK/2r5 b - - 4 36", "prompt": "Here is the current board:\n8 . . . . r k . .\n7 . . . . . . . .\n6 . n . R p . . p\n5 . . . . R . p .\n4 . . . . P . . .\n3 . . . . . . N P\n2 . . . . . P P K\n1 . . r . . . . .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 4\nFullmove number: 36\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "4rk2/8/1n1Rp2p/4R1p1/4P3/6NP/5PPK/2r5 b - - 4 36", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00401", "split": "perception", "task_type": "piece_id", "fen": "6k1/p1p3pp/2p5/2P5/8/P4R1P/1N2R1PK/r6r w - - 11 32", "prompt": "FEN: 6k1/p1p3pp/2p5/2P5/8/P4R1P/1N2R1PK/r6r w - - 11 32\nWhat piece is on a7?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "a7"}} {"example_id": "perception_00402", "split": "perception", "task_type": "material_count", "fen": "8/8/3k4/3P2p1/6P1/1K6/8/8 b - -", "prompt": "FEN: 8/8/3k4/3P2p1/6P1/1K6/8/8 b - -\nWhat is the material count for both sides?", "gold_answer": "White (3 pieces): 1 king, 2 pawns. Black (2 pieces): 1 king, 1 pawn. White is up 1 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00403", "split": "perception", "task_type": "square_lookup", "fen": "rn2kb1r/ppp2p1p/3pBn2/4p1Np/4P3/3P4/PPP2PPP/RN2K2R b KQkq - 0 9", "prompt": "FEN: rn2kb1r/ppp2p1p/3pBn2/4p1Np/4P3/3P4/PPP2PPP/RN2K2R b KQkq - 0 9\nWhat is on e8?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "e8=black king", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "e8", "diagnostic": true, "hard_gate": false, "square": "e8"}} {"example_id": "perception_00404", "split": "perception", "task_type": "rank_lookup", "fen": "7k/p2q1p2/1p4p1/3pr2p/1P1QBP2/P3P1P1/7P/6K1 b - -", "prompt": "FEN: 7k/p2q1p2/1p4p1/3pr2p/1P1QBP2/P3P1P1/7P/6K1 b - -\nWhat is the compressed FEN row for rank 4?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 4: 1P1QBP2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "4", "_rank_lookup_row": "1P1QBP2", "diagnostic": true, "hard_gate": false, "rank": "4", "fen_rank_row": "1P1QBP2"}} {"example_id": "perception_00405", "split": "perception", "task_type": "square_coordinates", "fen": "5k2/pb4p1/6P1/1p3NKP/5P2/P1q5/6q1/8 w - - 0 41", "prompt": "FEN: 5k2/pb4p1/6P1/1p3NKP/5P2/P1q5/6q1/8 w - - 0 41\nFor square b7, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "b7: file=b; rank=7; fen_row_from_top=2; file_index=2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "b7", "diagnostic": true, "hard_gate": false, "square": "b7"}} {"example_id": "perception_00406", "split": "perception", "task_type": "fen_rank_expansion", "fen": "5r2/6pp/8/3k4/8/4RP2/5P1P/6K1 w - - 5 41", "prompt": "FEN: 5r2/6pp/8/3k4/8/4RP2/5P1P/6K1 w - - 5 41\nCompressed rank 4 row: 8\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 4: a=1; b=1; c=1; d=1; e=1; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "4", "_fen_rank_expansion_row": "8", "diagnostic": true, "hard_gate": false, "rank": "4", "fen_rank_row": "8"}} {"example_id": "perception_00407", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r1b1kbnr/pppp1ppp/8/2q5/8/5N2/PPP1PPPP/R1BQKB1R w KQkq - 2 7", "prompt": "Rank 3 row before: 5N2\nFile a changes from 1 to P. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 3: 5N2 -> P4N2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "a2a3", "_fen_rank_cell_edit_square": "a3", "_fen_rank_cell_edit_rank": "3", "_fen_rank_cell_edit_file": "a", "_fen_rank_cell_edit_before_row": "5N2", "_fen_rank_cell_edit_after_row": "P4N2", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "P", "diagnostic": true, "hard_gate": false, "move": "a2a3", "square": "a3", "rank": "3", "file": "a", "before_row": "5N2", "after_row": "P4N2", "before_fen": "1", "after_fen": "P"}} {"example_id": "perception_00408", "split": "perception", "task_type": "fen_board_edit", "fen": "8/8/3p1p2/pBp1p3/P1P1r1k1/2K5/8/8 w - - 0 49", "prompt": "Board FEN before: 8/8/3p1p2/pBp1p3/P1P1r1k1/2K5/8/8\nApply square edits: c3 K->1; d3 1->K\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 8/8/3p1p2/pBp1p3/P1P1r1k1/3K4/8/8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "c3d3", "_fen_board_edit_board_fen_before": "8/8/3p1p2/pBp1p3/P1P1r1k1/2K5/8/8", "_fen_board_edit_board_fen_after": "8/8/3p1p2/pBp1p3/P1P1r1k1/3K4/8/8", "_fen_board_edit_edit_text": "c3 K->1; d3 1->K", "_fen_board_edit_changed_squares": [{"square": "c3", "before": "white king", "after": "empty", "before_fen": "K", "after_fen": "1"}, {"square": "d3", "before": "empty", "after": "white king", "before_fen": "1", "after_fen": "K"}], "diagnostic": true, "hard_gate": false, "move": "c3d3", "board_fen_before": "8/8/3p1p2/pBp1p3/P1P1r1k1/2K5/8/8", "board_fen_after": "8/8/3p1p2/pBp1p3/P1P1r1k1/3K4/8/8", "edit_text": "c3 K->1; d3 1->K", "changed_squares": [{"square": "c3", "before": "white king", "after": "empty", "before_fen": "K", "after_fen": "1"}, {"square": "d3", "before": "empty", "after": "white king", "before_fen": "1", "after_fen": "K"}]}} {"example_id": "perception_00409", "split": "perception", "task_type": "move_square_edits", "fen": "r2qr3/p6p/2pPk3/3NBp1Q/8/8/PPP2P1P/2KR3R b - - 0 20", "prompt": "Starting FEN: r2qr3/p6p/2pPk3/3NBp1Q/8/8/PPP2P1P/2KR3R b - - 0 20\nMove: e8f8\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: e8=black rook; f8=empty.\nSquares: e8 black rook->empty; f8 empty->black rook.\nRanks: rank 8 e r->1; rank 8 f 1->r.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "e8f8", "diagnostic": true, "hard_gate": false, "move": "e8f8"}} {"example_id": "perception_00410", "split": "perception", "task_type": "fen_assembly", "fen": "rn1qkbnr/pp3ppp/2p5/3p4/3P1P2/3B1Q2/PPP3PP/RNB1K2R b KQkq - 0 7", "prompt": "Starting FEN: rn1qkbnr/pp3ppp/2p5/3p4/3P1P2/3B1Q2/PPP3PP/RNB1K2R b KQkq - 0 7\nMove: d8g5\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 7\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black queen d8g5.\nLookup: d8=black queen; g5=empty.\nSquares: d8 black queen->empty; g5 empty->black queen.\nRanks: rank 8 d q->1; rank 5 g 1->q.\nResult FEN: rn2kbnr/pp3ppp/2p5/3p2q1/3P1P2/3B1Q2/PPP3PP/RNB1K2R w KQkq - 1 8", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "d8g5", "diagnostic": true, "hard_gate": false, "move": "d8g5"}} {"example_id": "perception_00411", "split": "perception", "task_type": "fen_row_application", "fen": "2rq1rk1/1p1b1pp1/p1nppb1p/8/3NP3/1BP3N1/PP3PPP/R2QR1K1 b - - 2 14", "prompt": "Starting FEN: 2rq1rk1/1p1b1pp1/p1nppb1p/8/3NP3/1BP3N1/PP3PPP/R2QR1K1 b - - 2 14\nMove: c6d4\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 2\nFullmove number: 14\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 6 p1nppb1p->p2ppb1p; rank 4 3NP3->3nP3.\nResult FEN: 2rq1rk1/1p1b1pp1/p2ppb1p/8/3nP3/1BP3N1/PP3PPP/R2QR1K1 w - - 0 15", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "c6d4", "_fen_row_application_rank_rewrites": [{"rank": "6", "before": "p1nppb1p", "after": "p2ppb1p"}, {"rank": "4", "before": "3NP3", "after": "3nP3"}], "diagnostic": true, "hard_gate": false, "move": "c6d4", "rank_rewrites": [{"rank": "6", "before": "p1nppb1p", "after": "p2ppb1p"}, {"rank": "4", "before": "3NP3", "after": "3nP3"}]}} {"example_id": "perception_00412", "split": "perception", "task_type": "state_tracking", "fen": "3rk2r/p3bpp1/5n1p/4p3/2P4B/2N4P/PP2BPb1/R3K1R1 b Qk - 1 20", "prompt": "Starting FEN: 3rk2r/p3bpp1/5n1p/4p3/2P4B/2N4P/PP2BPb1/R3K1R1 b Qk - 1 20\nAfter the moves g2h1, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: Qk\nEn passant: none\nHalfmove clock: 1\nFullmove number: 20\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 3rk2r/p3bpp1/5n1p/4p3/2P4B/2N4P/PP2BP2/R3K1Rb w Qk - 2 21", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "g2h1", "_state_tracking_result": "3rk2r/p3bpp1/5n1p/4p3/2P4B/2N4P/PP2BP2/R3K1Rb w Qk - 2 21"}} {"example_id": "perception_00413", "split": "perception", "task_type": "material_inventory", "fen": "r1b1kbnr/5p2/1q2p1p1/p1ppP3/P4P2/2PQ1NPp/1P5P/RNB2R1K b kq - 1 14", "prompt": "FEN: r1b1kbnr/5p2/1q2p1p1/p1ppP3/P4P2/2PQ1NPp/1P5P/RNB2R1K b kq - 1 14\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=h1; queen=d3; rook=a1,f1; bishop=c1; knight=b1,f3; pawn=b2,h2,c3,g3,a4,f4,e5.\nBlack inventory: king=e8; queen=b6; rook=a8,h8; bishop=c8,f8; knight=g8; pawn=h3,a5,c5,d5,e6,g6,f7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00414", "split": "perception", "task_type": "material_piece_counts", "fen": "1r1qrbk1/2pb1pp1/p1np1n1p/4p3/Pp2P3/2PP1N1P/1PB2PP1/R1BQRNK1 w - -", "prompt": "FEN: 1r1qrbk1/2pb1pp1/p1np1n1p/4p3/Pp2P3/2PP1N1P/1PB2PP1/R1BQRNK1 w - -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=8.\nBlack counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=8.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00415", "split": "perception", "task_type": "material_value_totals", "fen": "rnb4q/ppp1k1b1/3p1npp/8/3QP3/1B6/PPP2PPP/RNB1K2R w KQ - 0 11", "prompt": "FEN: rnb4q/ppp1k1b1/3p1npp/8/3QP3/1B6/PPP2PPP/RNB1K2R w KQ - 0 11\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=6; knight=3; pawn=7; total=35.\nBlack values: king=0; queen=9; rook=5; bishop=6; knight=6; pawn=6; total=32.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00416", "split": "perception", "task_type": "material_balance_trace", "fen": "8/6pp/4p3/k3P3/prP1N3/R1K4P/6P1/8 w - -", "prompt": "FEN: 8/6pp/4p3/k3P3/prP1N3/R1K4P/6P1/8 w - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=c3; queen=none; rook=a3; bishop=none; knight=e4; pawn=g2,h3,c4,e5 | black king=a5; queen=none; rook=b4; bishop=none; knight=none; pawn=a4,e6,g7,h7\nCounts: white king=1; queen=0; rook=1; bishop=0; knight=1; pawn=4 | black king=1; queen=0; rook=1; bishop=0; knight=0; pawn=4\nValues: white total=12; black total=9\nBalance: White is up 3 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00417", "split": "perception", "task_type": "multi_state_tracking", "fen": "8/2kP1n2/6pP/4p3/7P/1p1R1P2/1P2K3/7r w - - 1 37", "prompt": "Starting FEN: 8/2kP1n2/6pP/4p3/7P/1p1R1P2/1P2K3/7r w - - 1 37\nAfter the moves d3d6 f7d6 d7d8q, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 37\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 3Q4/2k5/3n2pP/4p3/7P/1p3P2/1P2K3/7r b - - 0 38", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "d3d6 f7d6 d7d8q", "_multi_state_tracking_result": "3Q4/2k5/3n2pP/4p3/7P/1p3P2/1P2K3/7r b - - 0 38", "diagnostic": true, "hard_gate": false, "moves": "d3d6 f7d6 d7d8q"}} {"example_id": "perception_00418", "split": "perception", "task_type": "board_print", "fen": "2R3k1/5p2/q3p2p/P5p1/8/1p2P1P1/5P1P/6K1 b - - 0 28", "prompt": "Position (FEN): 2R3k1/5p2/q3p2p/P5p1/8/1p2P1P1/5P1P/6K1 b - - 0 28\nShow me the board.", "gold_answer": "8 . . R . . . k .\n7 . . . . . p . .\n6 q . . . p . . p\n5 P . . . . . p .\n4 . . . . . . . .\n3 . p . . P . P .\n2 . . . . . P . P\n1 . . . . . . K .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00419", "split": "perception", "task_type": "board_to_fen", "fen": "1k1r1b1r/1p3ppp/3p4/1ppR4/4P3/4BP1P/PP3P2/2K4R w - - 0 23", "prompt": "Here is the current board:\n8 . k . r . b . r\n7 . p . . . p p p\n6 . . . p . . . .\n5 . p p R . . . .\n4 . . . . P . . .\n3 . . . . B P . P\n2 P P . . . P . .\n1 . . K . . . . R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 23\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "1k1r1b1r/1p3ppp/3p4/1ppR4/4P3/4BP1P/PP3P2/2K4R w - - 0 23", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00420", "split": "perception", "task_type": "piece_id", "fen": "r1br2k1/4ppbp/1pn3p1/p2n4/2P1P3/B4P2/PP2N1PP/R3KB1R w KQ -", "prompt": "FEN: r1br2k1/4ppbp/1pn3p1/p2n4/2P1P3/B4P2/PP2N1PP/R3KB1R w KQ -\nWhat piece is on b2?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "b2"}} {"example_id": "perception_00421", "split": "perception", "task_type": "material_count", "fen": "r1bq3r/2pkbQ1p/2p2p2/p2p2p1/3Pp3/BPP1P3/P2N2PP/R3NRK1 b - - 5 16", "prompt": "FEN: r1bq3r/2pkbQ1p/2p2p2/p2p2p1/3Pp3/BPP1P3/P2N2PP/R3NRK1 b - - 5 16\nWhat is the material count for both sides?", "gold_answer": "White (14 pieces): 1 bishop, 1 king, 2 knights, 7 pawns, 1 queen, 2 rooks. Black (14 pieces): 2 bishops, 1 king, 8 pawns, 1 queen, 2 rooks. White is up 2 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00422", "split": "perception", "task_type": "square_lookup", "fen": "r4r2/pp4k1/5p2/2bp1p2/7P/2N1PN2/PPP2P2/R3K3 w Q -", "prompt": "FEN: r4r2/pp4k1/5p2/2bp1p2/7P/2N1PN2/PPP2P2/R3K3 w Q -\nWhat is on b4?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "b4=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "b4", "diagnostic": true, "hard_gate": false, "square": "b4"}} {"example_id": "perception_00423", "split": "perception", "task_type": "rank_lookup", "fen": "r2qk2r/1ppb1pp1/pbn2n1p/3pp3/PP2P3/2PPBN1P/4BPP1/RN1Q1RK1 w kq - 2 11", "prompt": "FEN: r2qk2r/1ppb1pp1/pbn2n1p/3pp3/PP2P3/2PPBN1P/4BPP1/RN1Q1RK1 w kq - 2 11\nWhat is the compressed FEN row for rank 1?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 1: RN1Q1RK1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "1", "_rank_lookup_row": "RN1Q1RK1", "diagnostic": true, "hard_gate": false, "rank": "1", "fen_rank_row": "RN1Q1RK1"}} {"example_id": "perception_00424", "split": "perception", "task_type": "square_coordinates", "fen": "2r5/5k2/4R1p1/pP4rp/P7/5P2/3R1KPP/8 w - - 1 41", "prompt": "FEN: 2r5/5k2/4R1p1/pP4rp/P7/5P2/3R1KPP/8 w - - 1 41\nFor square a5, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "a5: file=a; rank=5; fen_row_from_top=4; file_index=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "a5", "diagnostic": true, "hard_gate": false, "square": "a5"}} {"example_id": "perception_00425", "split": "perception", "task_type": "fen_rank_expansion", "fen": "2r2k2/1b2q1pQ/p3np2/1p1p4/3P4/5N1P/PPB2PP1/1R4K1 w - - 1 27", "prompt": "FEN: 2r2k2/1b2q1pQ/p3np2/1p1p4/3P4/5N1P/PPB2PP1/1R4K1 w - - 1 27\nCompressed rank 6 row: p3np2\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 6: a=p; b=1; c=1; d=1; e=n; f=p; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "6", "_fen_rank_expansion_row": "p3np2", "diagnostic": true, "hard_gate": false, "rank": "6", "fen_rank_row": "p3np2"}} {"example_id": "perception_00426", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "rn1q1rk1/pp1b2pp/2p1p3/3p4/3PpP1b/1PP1P2P/P1QN4/RKB3N1 w - - 0 19", "prompt": "Rank 3 row before: 1PP1P2P\nFile a changes from 1 to B. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 3: 1PP1P2P -> BPP1P2P", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "c1a3", "_fen_rank_cell_edit_square": "a3", "_fen_rank_cell_edit_rank": "3", "_fen_rank_cell_edit_file": "a", "_fen_rank_cell_edit_before_row": "1PP1P2P", "_fen_rank_cell_edit_after_row": "BPP1P2P", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "B", "diagnostic": true, "hard_gate": false, "move": "c1a3", "square": "a3", "rank": "3", "file": "a", "before_row": "1PP1P2P", "after_row": "BPP1P2P", "before_fen": "1", "after_fen": "B"}} {"example_id": "perception_00427", "split": "perception", "task_type": "fen_board_edit", "fen": "r1bq1rk1/pp6/1npb1pp1/8/3P3p/2PB4/PP1Q1PPP/R1B1R1K1 w - -", "prompt": "Board FEN before: r1bq1rk1/pp6/1npb1pp1/8/3P3p/2PB4/PP1Q1PPP/R1B1R1K1\nApply square edits: b2 P->1; b4 1->P\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: r1bq1rk1/pp6/1npb1pp1/8/1P1P3p/2PB4/P2Q1PPP/R1B1R1K1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "b2b4", "_fen_board_edit_board_fen_before": "r1bq1rk1/pp6/1npb1pp1/8/3P3p/2PB4/PP1Q1PPP/R1B1R1K1", "_fen_board_edit_board_fen_after": "r1bq1rk1/pp6/1npb1pp1/8/1P1P3p/2PB4/P2Q1PPP/R1B1R1K1", "_fen_board_edit_edit_text": "b2 P->1; b4 1->P", "_fen_board_edit_changed_squares": [{"square": "b2", "before": "white pawn", "after": "empty", "before_fen": "P", "after_fen": "1"}, {"square": "b4", "before": "empty", "after": "white pawn", "before_fen": "1", "after_fen": "P"}], "diagnostic": true, "hard_gate": false, "move": "b2b4", "board_fen_before": "r1bq1rk1/pp6/1npb1pp1/8/3P3p/2PB4/PP1Q1PPP/R1B1R1K1", "board_fen_after": "r1bq1rk1/pp6/1npb1pp1/8/1P1P3p/2PB4/P2Q1PPP/R1B1R1K1", "edit_text": "b2 P->1; b4 1->P", "changed_squares": [{"square": "b2", "before": "white pawn", "after": "empty", "before_fen": "P", "after_fen": "1"}, {"square": "b4", "before": "empty", "after": "white pawn", "before_fen": "1", "after_fen": "P"}]}} {"example_id": "perception_00428", "split": "perception", "task_type": "move_square_edits", "fen": "r1b1k1nr/pppp1ppp/8/2bPn3/7q/5K2/PPP3PP/RNBQ1BNR w kq - 0 10", "prompt": "Starting FEN: r1b1k1nr/pppp1ppp/8/2bPn3/7q/5K2/PPP3PP/RNBQ1BNR w kq - 0 10\nMove: f3e2\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: f3=white king; e2=empty.\nSquares: f3 white king->empty; e2 empty->white king.\nRanks: rank 3 f K->1; rank 2 e 1->K.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "f3e2", "diagnostic": true, "hard_gate": false, "move": "f3e2"}} {"example_id": "perception_00429", "split": "perception", "task_type": "fen_assembly", "fen": "r3kb1r/1b1n1p2/1q3np1/4p1B1/p2pP2P/1p3PNB/PPPQ4/1KNR3R w kq -", "prompt": "Starting FEN: r3kb1r/1b1n1p2/1q3np1/4p1B1/p2pP2P/1p3PNB/PPPQ4/1KNR3R w kq - 0 1\nMove: d2e2\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: kq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white queen d2e2.\nLookup: d2=white queen; e2=empty.\nSquares: d2 white queen->empty; e2 empty->white queen.\nRanks: rank 2 d Q->1; rank 2 e 1->Q.\nResult FEN: r3kb1r/1b1n1p2/1q3np1/4p1B1/p2pP2P/1p3PNB/PPP1Q3/1KNR3R b kq - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "d2e2", "diagnostic": true, "hard_gate": false, "move": "d2e2"}} {"example_id": "perception_00430", "split": "perception", "task_type": "fen_row_application", "fen": "rn1q1rk1/p4ppp/b2p1b2/1pp1p3/4P3/P1NP1N1P/BPP2PP1/R2QK2R w KQ - 0 11", "prompt": "Starting FEN: rn1q1rk1/p4ppp/b2p1b2/1pp1p3/4P3/P1NP1N1P/BPP2PP1/R2QK2R w KQ - 0 11\nMove: g2g4\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 0\nFullmove number: 11\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 2 BPP2PP1->BPP2P2; rank 4 4P3->4P1P1.\nResult FEN: rn1q1rk1/p4ppp/b2p1b2/1pp1p3/4P1P1/P1NP1N1P/BPP2P2/R2QK2R b KQ - 0 11", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "g2g4", "_fen_row_application_rank_rewrites": [{"rank": "2", "before": "BPP2PP1", "after": "BPP2P2"}, {"rank": "4", "before": "4P3", "after": "4P1P1"}], "diagnostic": true, "hard_gate": false, "move": "g2g4", "rank_rewrites": [{"rank": "2", "before": "BPP2PP1", "after": "BPP2P2"}, {"rank": "4", "before": "4P3", "after": "4P1P1"}]}} {"example_id": "perception_00431", "split": "perception", "task_type": "state_tracking", "fen": "8/8/p7/1p4kP/1K2P1p1/8/8/8 w - -", "prompt": "Starting FEN: 8/8/p7/1p4kP/1K2P1p1/8/8/8 w - - 0 1\nAfter the moves b4c3, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 8/8/p7/1p4kP/4P1p1/2K5/8/8 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "b4c3", "_state_tracking_result": "8/8/p7/1p4kP/4P1p1/2K5/8/8 b - - 1 1"}} {"example_id": "perception_00432", "split": "perception", "task_type": "material_inventory", "fen": "r1bqkb1r/pp3ppp/2n1p1n1/3pP3/3P3P/p1PB1N2/5PP1/RNBQK2R b KQkq -", "prompt": "FEN: r1bqkb1r/pp3ppp/2n1p1n1/3pP3/3P3P/p1PB1N2/5PP1/RNBQK2R b KQkq -\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=e1; queen=d1; rook=a1,h1; bishop=c1,d3; knight=b1,f3; pawn=f2,g2,c3,d4,h4,e5.\nBlack inventory: king=e8; queen=d8; rook=a8,h8; bishop=c8,f8; knight=c6,g6; pawn=a3,d5,e6,a7,b7,f7,g7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00433", "split": "perception", "task_type": "material_piece_counts", "fen": "r1b1k2r/pp3ppp/2n5/qBbp4/8/4P2P/PP3PP1/R1BQK1NR w KQkq - 1 10", "prompt": "FEN: r1b1k2r/pp3ppp/2n5/qBbp4/8/4P2P/PP3PP1/R1BQK1NR w KQkq - 1 10\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=2; knight=1; pawn=6.\nBlack counts: king=1; queen=1; rook=2; bishop=2; knight=1; pawn=6.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00434", "split": "perception", "task_type": "material_value_totals", "fen": "1r3rk1/1B3ppp/p3pn2/PpN5/5P2/2q4P/3P2P1/2R2R1K w - - 0 28", "prompt": "FEN: 1r3rk1/1B3ppp/p3pn2/PpN5/5P2/2q4P/3P2P1/2R2R1K w - - 0 28\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=10; bishop=3; knight=3; pawn=5; total=21.\nBlack values: king=0; queen=9; rook=10; bishop=0; knight=3; pawn=6; total=28.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00435", "split": "perception", "task_type": "material_balance_trace", "fen": "r2q1rk1/pb2b2p/1p3p2/3p2p1/Q1pPn3/P3B1P1/1P1NPPBP/R4RK1 b - -", "prompt": "FEN: r2q1rk1/pb2b2p/1p3p2/3p2p1/Q1pPn3/P3B1P1/1P1NPPBP/R4RK1 b - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=a4; rook=a1,f1; bishop=g2,e3; knight=d2; pawn=b2,e2,f2,h2,a3,g3,d4 | black king=g8; queen=d8; rook=a8,f8; bishop=b7,e7; knight=e4; pawn=c4,d5,g5,b6,f6,a7,h7\nCounts: white king=1; queen=1; rook=2; bishop=2; knight=1; pawn=7 | black king=1; queen=1; rook=2; bishop=2; knight=1; pawn=7\nValues: white total=35; black total=35\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00436", "split": "perception", "task_type": "multi_state_tracking", "fen": "r1bqk1r1/ppp2p2/2np1n2/4p1B1/1bB1P2P/2NP4/PPP2PP1/R2QK2R w KQq -", "prompt": "Starting FEN: r1bqk1r1/ppp2p2/2np1n2/4p1B1/1bB1P2P/2NP4/PPP2PP1/R2QK2R w KQq - 0 1\nAfter the moves a1b1 g8h8, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: KQq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r1bqk2r/ppp2p2/2np1n2/4p1B1/1bB1P2P/2NP4/PPP2PP1/1R1QK2R w Kq - 2 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "a1b1 g8h8", "_multi_state_tracking_result": "r1bqk2r/ppp2p2/2np1n2/4p1B1/1bB1P2P/2NP4/PPP2PP1/1R1QK2R w Kq - 2 2", "diagnostic": true, "hard_gate": false, "moves": "a1b1 g8h8"}} {"example_id": "perception_00437", "split": "perception", "task_type": "board_print", "fen": "rnb1k1nr/pp1p1ppp/2p2q2/4p1BQ/1b2P3/2NP4/PPP2PPP/R3KBNR b KQkq - 2 5", "prompt": "Position (FEN): rnb1k1nr/pp1p1ppp/2p2q2/4p1BQ/1b2P3/2NP4/PPP2PPP/R3KBNR b KQkq - 2 5\nShow me the board.", "gold_answer": "8 r n b . k . n r\n7 p p . p . p p p\n6 . . p . . q . .\n5 . . . . p . B Q\n4 . b . . P . . .\n3 . . N P . . . .\n2 P P P . . P P P\n1 R . . . K B N R\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00438", "split": "perception", "task_type": "board_to_fen", "fen": "1r1q1rk1/ppp1bppp/2np4/6Nn/2Q1P3/4B3/PPP2PPP/R3KB1R b KQ - 12 12", "prompt": "Here is the current board:\n8 . r . q . r k .\n7 p p p . b p p p\n6 . . n p . . . .\n5 . . . . . . N n\n4 . . Q . P . . .\n3 . . . . B . . .\n2 P P P . . P P P\n1 R . . . K B . R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 12\nFullmove number: 12\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "1r1q1rk1/ppp1bppp/2np4/6Nn/2Q1P3/4B3/PPP2PPP/R3KB1R b KQ - 12 12", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00439", "split": "perception", "task_type": "piece_id", "fen": "r1bqr1k1/4p1bp/p4pp1/P2p4/2pP4/2P3BP/1PB1QPP1/R3R1K1 b - - 1 21", "prompt": "FEN: r1bqr1k1/4p1bp/p4pp1/P2p4/2pP4/2P3BP/1PB1QPP1/R3R1K1 b - - 1 21\nWhat piece is on f6?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "f6"}} {"example_id": "perception_00440", "split": "perception", "task_type": "material_count", "fen": "r2q1rk1/pp3pbp/2np1np1/1N2pb2/2P5/2N1P3/PP2BPPP/R1BQR1K1 w - -", "prompt": "FEN: r2q1rk1/pp3pbp/2np1np1/1N2pb2/2P5/2N1P3/PP2BPPP/R1BQR1K1 w - -\nWhat is the material count for both sides?", "gold_answer": "White (15 pieces): 2 bishops, 1 king, 2 knights, 7 pawns, 1 queen, 2 rooks. Black (15 pieces): 2 bishops, 1 king, 2 knights, 7 pawns, 1 queen, 2 rooks. Material is equal.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00441", "split": "perception", "task_type": "square_lookup", "fen": "3r1rk1/p5p1/2p5/1p2Ppq1/8/2P1n3/PP2Q1P1/RNK4R w - -", "prompt": "FEN: 3r1rk1/p5p1/2p5/1p2Ppq1/8/2P1n3/PP2Q1P1/RNK4R w - -\nWhat is on c7?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "c7=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "c7", "diagnostic": true, "hard_gate": false, "square": "c7"}} {"example_id": "perception_00442", "split": "perception", "task_type": "rank_lookup", "fen": "8/3k3P/P2B4/2Pp2K1/3P2P1/8/P7/8 b - - 0 55", "prompt": "FEN: 8/3k3P/P2B4/2Pp2K1/3P2P1/8/P7/8 b - - 0 55\nWhat is the compressed FEN row for rank 4?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 4: 3P2P1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "4", "_rank_lookup_row": "3P2P1", "diagnostic": true, "hard_gate": false, "rank": "4", "fen_rank_row": "3P2P1"}} {"example_id": "perception_00443", "split": "perception", "task_type": "square_coordinates", "fen": "rn1qk1nr/pbppppbp/1p4p1/3P4/2P5/2N5/PP2PPPP/R1BQKBNR w KQkq -", "prompt": "FEN: rn1qk1nr/pbppppbp/1p4p1/3P4/2P5/2N5/PP2PPPP/R1BQKBNR w KQkq -\nFor square f1, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "f1: file=f; rank=1; fen_row_from_top=8; file_index=6", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "f1", "diagnostic": true, "hard_gate": false, "square": "f1"}} {"example_id": "perception_00444", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r4r1k/pp3pp1/2n5/7q/1b1pBBb1/6N1/PPQ2PPP/R4RK1 b - -", "prompt": "FEN: r4r1k/pp3pp1/2n5/7q/1b1pBBb1/6N1/PPQ2PPP/R4RK1 b - -\nCompressed rank 6 row: 2n5\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 6: a=1; b=1; c=n; d=1; e=1; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "6", "_fen_rank_expansion_row": "2n5", "diagnostic": true, "hard_gate": false, "rank": "6", "fen_rank_row": "2n5"}} {"example_id": "perception_00445", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "6k1/B5p1/3b3p/P3pp2/4P2P/5N2/2r2PP1/R5K1 w - - 0 29", "prompt": "Rank 1 row before: R5K1\nFile d changes from 1 to R. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 1: R5K1 -> 3R2K1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "a1d1", "_fen_rank_cell_edit_square": "d1", "_fen_rank_cell_edit_rank": "1", "_fen_rank_cell_edit_file": "d", "_fen_rank_cell_edit_before_row": "R5K1", "_fen_rank_cell_edit_after_row": "3R2K1", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "R", "diagnostic": true, "hard_gate": false, "move": "a1d1", "square": "d1", "rank": "1", "file": "d", "before_row": "R5K1", "after_row": "3R2K1", "before_fen": "1", "after_fen": "R"}} {"example_id": "perception_00446", "split": "perception", "task_type": "fen_board_edit", "fen": "1R6/3k4/P2r2pp/2p5/4p3/6P1/4KP1P/8 w - -", "prompt": "Board FEN before: 1R6/3k4/P2r2pp/2p5/4p3/6P1/4KP1P/8\nApply square edits: h2 P->1; h4 1->P\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 1R6/3k4/P2r2pp/2p5/4p2P/6P1/4KP2/8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "h2h4", "_fen_board_edit_board_fen_before": "1R6/3k4/P2r2pp/2p5/4p3/6P1/4KP1P/8", "_fen_board_edit_board_fen_after": "1R6/3k4/P2r2pp/2p5/4p2P/6P1/4KP2/8", "_fen_board_edit_edit_text": "h2 P->1; h4 1->P", "_fen_board_edit_changed_squares": [{"square": "h2", "before": "white pawn", "after": "empty", "before_fen": "P", "after_fen": "1"}, {"square": "h4", "before": "empty", "after": "white pawn", "before_fen": "1", "after_fen": "P"}], "diagnostic": true, "hard_gate": false, "move": "h2h4", "board_fen_before": "1R6/3k4/P2r2pp/2p5/4p3/6P1/4KP1P/8", "board_fen_after": "1R6/3k4/P2r2pp/2p5/4p2P/6P1/4KP2/8", "edit_text": "h2 P->1; h4 1->P", "changed_squares": [{"square": "h2", "before": "white pawn", "after": "empty", "before_fen": "P", "after_fen": "1"}, {"square": "h4", "before": "empty", "after": "white pawn", "before_fen": "1", "after_fen": "P"}]}} {"example_id": "perception_00447", "split": "perception", "task_type": "move_square_edits", "fen": "8/8/4B3/4N3/2K5/8/2k5/8 w - -", "prompt": "Starting FEN: 8/8/4B3/4N3/2K5/8/2k5/8 w - -\nMove: e6d7\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: e6=white bishop; d7=empty.\nSquares: e6 white bishop->empty; d7 empty->white bishop.\nRanks: rank 6 e B->1; rank 7 d 1->B.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "e6d7", "diagnostic": true, "hard_gate": false, "move": "e6d7"}} {"example_id": "perception_00448", "split": "perception", "task_type": "fen_assembly", "fen": "r2qk1nr/pp1n1ppp/2p1p3/2bp4/4P3/2N2QPP/PPPP1PB1/R1B1K2R w KQkq -", "prompt": "Starting FEN: r2qk1nr/pp1n1ppp/2p1p3/2bp4/4P3/2N2QPP/PPPP1PB1/R1B1K2R w KQkq - 0 1\nMove: h1f1\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white rook h1f1.\nLookup: h1=white rook; f1=empty.\nSquares: h1 white rook->empty; f1 empty->white rook.\nRanks: rank 1 h R->1; rank 1 f 1->R.\nResult FEN: r2qk1nr/pp1n1ppp/2p1p3/2bp4/4P3/2N2QPP/PPPP1PB1/R1B1KR2 b Qkq - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "h1f1", "diagnostic": true, "hard_gate": false, "move": "h1f1"}} {"example_id": "perception_00449", "split": "perception", "task_type": "fen_row_application", "fen": "3r2k1/3P3p/3P2p1/p3p3/8/3q3P/Q4BPK/8 b - -", "prompt": "Starting FEN: 3r2k1/3P3p/3P2p1/p3p3/8/3q3P/Q4BPK/8 b - - 0 1\nMove: d3c4\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 3 3q3P->7P; rank 4 8->2q5.\nResult FEN: 3r2k1/3P3p/3P2p1/p3p3/2q5/7P/Q4BPK/8 w - - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "d3c4", "_fen_row_application_rank_rewrites": [{"rank": "3", "before": "3q3P", "after": "7P"}, {"rank": "4", "before": "8", "after": "2q5"}], "diagnostic": true, "hard_gate": false, "move": "d3c4", "rank_rewrites": [{"rank": "3", "before": "3q3P", "after": "7P"}, {"rank": "4", "before": "8", "after": "2q5"}]}} {"example_id": "perception_00450", "split": "perception", "task_type": "state_tracking", "fen": "5B2/R4ppk/6bp/3B4/4P3/4R2P/5PK1/8 b - - 0 38", "prompt": "Starting FEN: 5B2/R4ppk/6bp/3B4/4P3/4R2P/5PK1/8 b - - 0 38\nAfter the moves h6h5, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 38\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 5B2/R4ppk/6b1/3B3p/4P3/4R2P/5PK1/8 w - - 0 39", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "h6h5", "_state_tracking_result": "5B2/R4ppk/6b1/3B3p/4P3/4R2P/5PK1/8 w - - 0 39"}} {"example_id": "perception_00451", "split": "perception", "task_type": "material_inventory", "fen": "6k1/3n3p/3b2p1/8/r7/4N1PB/5P1P/1R4K1 w - -", "prompt": "FEN: 6k1/3n3p/3b2p1/8/r7/4N1PB/5P1P/1R4K1 w - -\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=none; rook=b1; bishop=h3; knight=e3; pawn=f2,h2,g3.\nBlack inventory: king=g8; queen=none; rook=a4; bishop=d6; knight=d7; pawn=g6,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00452", "split": "perception", "task_type": "material_piece_counts", "fen": "8/p4pkp/1p4p1/2p2bP1/3r1P1P/8/4K3/8 w - - 2 41", "prompt": "FEN: 8/p4pkp/1p4p1/2p2bP1/3r1P1P/8/4K3/8 w - - 2 41\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=0; bishop=0; knight=0; pawn=3.\nBlack counts: king=1; queen=0; rook=1; bishop=1; knight=0; pawn=6.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00453", "split": "perception", "task_type": "material_value_totals", "fen": "r4Nk1/pppn2p1/1n2pq1p/3p4/3P4/2P1P1B1/P1Q2PPP/R3R1K1 b - - 0 19", "prompt": "FEN: r4Nk1/pppn2p1/1n2pq1p/3p4/3P4/2P1P1B1/P1Q2PPP/R3R1K1 b - - 0 19\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=3; knight=3; pawn=7; total=32.\nBlack values: king=0; queen=9; rook=5; bishop=0; knight=6; pawn=7; total=27.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00454", "split": "perception", "task_type": "material_balance_trace", "fen": "7r/1N1kr1pp/1Pp2p2/p2p4/P1bP4/Q3P3/5PPP/RR4K1 b - - 0 30", "prompt": "FEN: 7r/1N1kr1pp/1Pp2p2/p2p4/P1bP4/Q3P3/5PPP/RR4K1 b - - 0 30\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=a3; rook=a1,b1; bishop=none; knight=b7; pawn=f2,g2,h2,e3,a4,d4,b6 | black king=d7; queen=none; rook=e7,h8; bishop=c4; knight=none; pawn=a5,d5,c6,f6,g7,h7\nCounts: white king=1; queen=1; rook=2; bishop=0; knight=1; pawn=7 | black king=1; queen=0; rook=2; bishop=1; knight=0; pawn=6\nValues: white total=29; black total=19\nBalance: White is up 10 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00455", "split": "perception", "task_type": "multi_state_tracking", "fen": "rnbq1rk1/pp1pppbp/5np1/3P4/4P3/2N2N2/PP3PPP/R1BQKB1R b KQ - 0 7", "prompt": "Starting FEN: rnbq1rk1/pp1pppbp/5np1/3P4/4P3/2N2N2/PP3PPP/R1BQKB1R b KQ - 0 7\nAfter the moves f6d5 e1d2 g7h8, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 0\nFullmove number: 7\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rnbq1rkb/pp1ppp1p/6p1/3n4/4P3/2N2N2/PP1K1PPP/R1BQ1B1R w - - 2 9", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "f6d5 e1d2 g7h8", "_multi_state_tracking_result": "rnbq1rkb/pp1ppp1p/6p1/3n4/4P3/2N2N2/PP1K1PPP/R1BQ1B1R w - - 2 9", "diagnostic": true, "hard_gate": false, "moves": "f6d5 e1d2 g7h8"}} {"example_id": "perception_00456", "split": "perception", "task_type": "board_print", "fen": "5rk1/1b3p1p/2q1pQp1/1B1pP3/3P4/7P/5PP1/1R4K1 w - - 1 26", "prompt": "Position (FEN): 5rk1/1b3p1p/2q1pQp1/1B1pP3/3P4/7P/5PP1/1R4K1 w - - 1 26\nShow me the board.", "gold_answer": "8 . . . . . r k .\n7 . b . . . p . p\n6 . . q . p Q p .\n5 . B . p P . . .\n4 . . . P . . . .\n3 . . . . . . . P\n2 . . . . . P P .\n1 . R . . . . K .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00457", "split": "perception", "task_type": "board_to_fen", "fen": "1r1qkb1r/Q2n1ppp/p2Pp3/1p2B3/6P1/PNN5/1PP1B1bP/2KR1R2 b k -", "prompt": "Here is the current board:\n8 . r . q k b . r\n7 Q . . n . p p p\n6 p . . P p . . .\n5 . p . . B . . .\n4 . . . . . . P .\n3 P N N . . . . .\n2 . P P . B . b P\n1 . . K R . R . .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: k\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "1r1qkb1r/Q2n1ppp/p2Pp3/1p2B3/6P1/PNN5/1PP1B1bP/2KR1R2 b k - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00458", "split": "perception", "task_type": "piece_id", "fen": "r3kb1r/1b3ppp/8/pPp5/P2p4/4BP1P/4B1P1/RN2K1NR b KQkq - 0 17", "prompt": "FEN: r3kb1r/1b3ppp/8/pPp5/P2p4/4BP1P/4B1P1/RN2K1NR b KQkq - 0 17\nWhat piece is on g2?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "g2"}} {"example_id": "perception_00459", "split": "perception", "task_type": "material_count", "fen": "1rq1kb1r/p4ppp/b3p1n1/1P1pP3/P2p1P2/2P5/5KPP/RNBQ3R w k - 0 14", "prompt": "FEN: 1rq1kb1r/p4ppp/b3p1n1/1P1pP3/P2p1P2/2P5/5KPP/RNBQ3R w k - 0 14\nWhat is the material count for both sides?", "gold_answer": "White (13 pieces): 1 bishop, 1 king, 1 knight, 7 pawns, 1 queen, 2 rooks. Black (14 pieces): 2 bishops, 1 king, 1 knight, 7 pawns, 1 queen, 2 rooks. Black is up 3 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00460", "split": "perception", "task_type": "square_lookup", "fen": "8/8/5k2/2K5/4Q3/8/8/8 b - -", "prompt": "FEN: 8/8/5k2/2K5/4Q3/8/8/8 b - -\nWhat is on c5?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "c5=white king", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "c5", "diagnostic": true, "hard_gate": false, "square": "c5"}} {"example_id": "perception_00461", "split": "perception", "task_type": "rank_lookup", "fen": "3r1rk1/1p3ppn/p1n4p/2p1p1b1/1P2P3/PBN2Q1P/2R2PP1/6K1 w - -", "prompt": "FEN: 3r1rk1/1p3ppn/p1n4p/2p1p1b1/1P2P3/PBN2Q1P/2R2PP1/6K1 w - -\nWhat is the compressed FEN row for rank 3?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 3: PBN2Q1P", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "3", "_rank_lookup_row": "PBN2Q1P", "diagnostic": true, "hard_gate": false, "rank": "3", "fen_rank_row": "PBN2Q1P"}} {"example_id": "perception_00462", "split": "perception", "task_type": "square_coordinates", "fen": "r1bqk2r/1p1pbpp1/p1n1p2p/2P4Q/4N3/1R2B3/2B2PPP/3R2K1 b kq -", "prompt": "FEN: r1bqk2r/1p1pbpp1/p1n1p2p/2P4Q/4N3/1R2B3/2B2PPP/3R2K1 b kq -\nFor square d4, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "d4: file=d; rank=4; fen_row_from_top=5; file_index=4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "d4", "diagnostic": true, "hard_gate": false, "square": "d4"}} {"example_id": "perception_00463", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r2qr1k1/p1p1bpp1/8/7n/3PQ1bP/4P1P1/PP1P1P2/RNB1K2R b KQ - 2 18", "prompt": "FEN: r2qr1k1/p1p1bpp1/8/7n/3PQ1bP/4P1P1/PP1P1P2/RNB1K2R b KQ - 2 18\nCompressed rank 7 row: p1p1bpp1\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 7: a=p; b=1; c=p; d=1; e=b; f=p; g=p; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "7", "_fen_rank_expansion_row": "p1p1bpp1", "diagnostic": true, "hard_gate": false, "rank": "7", "fen_rank_row": "p1p1bpp1"}} {"example_id": "perception_00464", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r1bqk2r/pp1p1p2/2n1pn1p/2b3p1/2P1P2B/2NB1N2/PP3PPP/R2QK2R w KQkq -", "prompt": "Rank 2 row before: PP3PPP\nFile a changes from P to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 2: PP3PPP -> 1P3PPP", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "a2a3", "_fen_rank_cell_edit_square": "a2", "_fen_rank_cell_edit_rank": "2", "_fen_rank_cell_edit_file": "a", "_fen_rank_cell_edit_before_row": "PP3PPP", "_fen_rank_cell_edit_after_row": "1P3PPP", "_fen_rank_cell_edit_before_fen": "P", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "a2a3", "square": "a2", "rank": "2", "file": "a", "before_row": "PP3PPP", "after_row": "1P3PPP", "before_fen": "P", "after_fen": "1"}} {"example_id": "perception_00465", "split": "perception", "task_type": "fen_board_edit", "fen": "r2q1rk1/ppp2ppp/8/n2B4/5B2/2PP3b/P1P3P1/R2Q1RK1 w - - 0 15", "prompt": "Board FEN before: r2q1rk1/ppp2ppp/8/n2B4/5B2/2PP3b/P1P3P1/R2Q1RK1\nApply square edits: g1 K->1; f2 1->K\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: r2q1rk1/ppp2ppp/8/n2B4/5B2/2PP3b/P1P2KP1/R2Q1R2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "g1f2", "_fen_board_edit_board_fen_before": "r2q1rk1/ppp2ppp/8/n2B4/5B2/2PP3b/P1P3P1/R2Q1RK1", "_fen_board_edit_board_fen_after": "r2q1rk1/ppp2ppp/8/n2B4/5B2/2PP3b/P1P2KP1/R2Q1R2", "_fen_board_edit_edit_text": "g1 K->1; f2 1->K", "_fen_board_edit_changed_squares": [{"square": "g1", "before": "white king", "after": "empty", "before_fen": "K", "after_fen": "1"}, {"square": "f2", "before": "empty", "after": "white king", "before_fen": "1", "after_fen": "K"}], "diagnostic": true, "hard_gate": false, "move": "g1f2", "board_fen_before": "r2q1rk1/ppp2ppp/8/n2B4/5B2/2PP3b/P1P3P1/R2Q1RK1", "board_fen_after": "r2q1rk1/ppp2ppp/8/n2B4/5B2/2PP3b/P1P2KP1/R2Q1R2", "edit_text": "g1 K->1; f2 1->K", "changed_squares": [{"square": "g1", "before": "white king", "after": "empty", "before_fen": "K", "after_fen": "1"}, {"square": "f2", "before": "empty", "after": "white king", "before_fen": "1", "after_fen": "K"}]}} {"example_id": "perception_00466", "split": "perception", "task_type": "move_square_edits", "fen": "r3r1k1/7p/p2p3b/1p1P1bp1/5p2/1N2P2P/PP3PPB/R2R2K1 w - - 0 23", "prompt": "Starting FEN: r3r1k1/7p/p2p3b/1p1P1bp1/5p2/1N2P2P/PP3PPB/R2R2K1 w - - 0 23\nMove: d1d4\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: d1=white rook; d4=empty.\nSquares: d1 white rook->empty; d4 empty->white rook.\nRanks: rank 1 d R->1; rank 4 d 1->R.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "d1d4", "diagnostic": true, "hard_gate": false, "move": "d1d4"}} {"example_id": "perception_00467", "split": "perception", "task_type": "fen_assembly", "fen": "1k2r3/1pp2p1Q/3prp2/8/pq2P3/1P3P2/P1P3PP/1K1RR3 w - - 0 23", "prompt": "Starting FEN: 1k2r3/1pp2p1Q/3prp2/8/pq2P3/1P3P2/P1P3PP/1K1RR3 w - - 0 23\nMove: e1g1\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 23\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white rook e1g1.\nLookup: e1=white rook; g1=empty.\nSquares: e1 white rook->empty; g1 empty->white rook.\nRanks: rank 1 e R->1; rank 1 g 1->R.\nResult FEN: 1k2r3/1pp2p1Q/3prp2/8/pq2P3/1P3P2/P1P3PP/1K1R2R1 b - - 1 23", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "e1g1", "diagnostic": true, "hard_gate": false, "move": "e1g1"}} {"example_id": "perception_00468", "split": "perception", "task_type": "fen_row_application", "fen": "r4q2/1bk1n1pp/pp1pB3/2p1p1Q1/4P3/3P3P/PPP2PP1/R4RK1 w - -", "prompt": "Starting FEN: r4q2/1bk1n1pp/pp1pB3/2p1p1Q1/4P3/3P3P/PPP2PP1/R4RK1 w - - 0 1\nMove: f1d1\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 1 R4RK1->R2R2K1.\nResult FEN: r4q2/1bk1n1pp/pp1pB3/2p1p1Q1/4P3/3P3P/PPP2PP1/R2R2K1 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "f1d1", "_fen_row_application_rank_rewrites": [{"rank": "1", "before": "R4RK1", "after": "R2R2K1"}], "diagnostic": true, "hard_gate": false, "move": "f1d1", "rank_rewrites": [{"rank": "1", "before": "R4RK1", "after": "R2R2K1"}]}} {"example_id": "perception_00469", "split": "perception", "task_type": "state_tracking", "fen": "r1bqkbnr/pppp1ppp/2n5/4P3/5B2/8/PPP1PPPP/RN1QKBNR b KQkq - 0 3", "prompt": "Starting FEN: r1bqkbnr/pppp1ppp/2n5/4P3/5B2/8/PPP1PPPP/RN1QKBNR b KQkq - 0 3\nAfter the moves d7d5, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 3\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r1bqkbnr/ppp2ppp/2n5/3pP3/5B2/8/PPP1PPPP/RN1QKBNR w KQkq d6 0 4", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "d7d5", "_state_tracking_result": "r1bqkbnr/ppp2ppp/2n5/3pP3/5B2/8/PPP1PPPP/RN1QKBNR w KQkq d6 0 4"}} {"example_id": "perception_00470", "split": "perception", "task_type": "material_inventory", "fen": "8/5k2/p1PKp3/4P2p/6p1/5P2/P6P/8 b - - 0 37", "prompt": "FEN: 8/5k2/p1PKp3/4P2p/6p1/5P2/P6P/8 b - - 0 37\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=d6; queen=none; rook=none; bishop=none; knight=none; pawn=a2,h2,f3,e5,c6.\nBlack inventory: king=f7; queen=none; rook=none; bishop=none; knight=none; pawn=g4,h5,a6,e6.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00471", "split": "perception", "task_type": "material_piece_counts", "fen": "2br2k1/5p1p/pPN5/R1pP2p1/N1P5/5BKP/5P2/1q2r3 b - - 0 38", "prompt": "FEN: 2br2k1/5p1p/pPN5/R1pP2p1/N1P5/5BKP/5P2/1q2r3 b - - 0 38\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=1; bishop=1; knight=2; pawn=5.\nBlack counts: king=1; queen=1; rook=2; bishop=1; knight=0; pawn=5.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00472", "split": "perception", "task_type": "material_value_totals", "fen": "r1bqk2r/4bp1p/p2ppp2/1p2P3/3Q1P2/2N5/PPP3PP/2KR1B1R b kq -", "prompt": "FEN: r1bqk2r/4bp1p/p2ppp2/1p2P3/3Q1P2/2N5/PPP3PP/2KR1B1R b kq -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=3; knight=3; pawn=7; total=32.\nBlack values: king=0; queen=9; rook=10; bishop=6; knight=0; pawn=7; total=32.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00473", "split": "perception", "task_type": "material_balance_trace", "fen": "2kr1b1r/ppp1pppp/2nq1n2/5b2/2BP4/2N1PN2/PP2QPPP/R1B1K2R w KQ - 7 8", "prompt": "FEN: 2kr1b1r/ppp1pppp/2nq1n2/5b2/2BP4/2N1PN2/PP2QPPP/R1B1K2R w KQ - 7 8\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=e1; queen=e2; rook=a1,h1; bishop=c1,c4; knight=c3,f3; pawn=a2,b2,f2,g2,h2,e3,d4 | black king=c8; queen=d6; rook=d8,h8; bishop=f5,f8; knight=c6,f6; pawn=a7,b7,c7,e7,f7,g7,h7\nCounts: white king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7 | black king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7\nValues: white total=38; black total=38\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00474", "split": "perception", "task_type": "multi_state_tracking", "fen": "r1bqk2r/1p3ppp/p1n1pn2/8/PbBP4/5N2/1P2QPPP/RNBR2K1 b kq -", "prompt": "Starting FEN: r1bqk2r/1p3ppp/p1n1pn2/8/PbBP4/5N2/1P2QPPP/RNBR2K1 b kq - 0 1\nAfter the moves b4f8 g2g4 d8d5, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: kq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r1b1kb1r/1p3ppp/p1n1pn2/3q4/P1BP2P1/5N2/1P2QP1P/RNBR2K1 w kq - 1 3", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "b4f8 g2g4 d8d5", "_multi_state_tracking_result": "r1b1kb1r/1p3ppp/p1n1pn2/3q4/P1BP2P1/5N2/1P2QP1P/RNBR2K1 w kq - 1 3", "diagnostic": true, "hard_gate": false, "moves": "b4f8 g2g4 d8d5"}} {"example_id": "perception_00475", "split": "perception", "task_type": "board_print", "fen": "r3r1k1/ppp2ppp/2pb4/5b2/3P4/2N2P2/PPP2P1P/R1K4R b - - 0 15", "prompt": "Position (FEN): r3r1k1/ppp2ppp/2pb4/5b2/3P4/2N2P2/PPP2P1P/R1K4R b - - 0 15\nShow me the board.", "gold_answer": "8 r . . . r . k .\n7 p p p . . p p p\n6 . . p b . . . .\n5 . . . . . b . .\n4 . . . P . . . .\n3 . . N . . P . .\n2 P P P . . P . P\n1 R . K . . . . R\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00476", "split": "perception", "task_type": "board_to_fen", "fen": "2r5/6p1/kp3r1p/pNp5/2P1P3/1R1R1PP1/1P4KP/8 b - - 0 34", "prompt": "Here is the current board:\n8 . . r . . . . .\n7 . . . . . . p .\n6 k p . . . r . p\n5 p N p . . . . .\n4 . . P . P . . .\n3 . R . R . P P .\n2 . P . . . . K P\n1 . . . . . . . .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 34\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "2r5/6p1/kp3r1p/pNp5/2P1P3/1R1R1PP1/1P4KP/8 b - - 0 34", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00477", "split": "perception", "task_type": "piece_id", "fen": "Nnbr1k2/pp5p/6p1/3B1pb1/2P5/1P2P1P1/Pn1N1P1P/R1K2R2 b - - 1 18", "prompt": "FEN: Nnbr1k2/pp5p/6p1/3B1pb1/2P5/1P2P1P1/Pn1N1P1P/R1K2R2 b - - 1 18\nWhat piece is on a7?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "a7"}} {"example_id": "perception_00478", "split": "perception", "task_type": "material_count", "fen": "r1b1kb1r/2ppqp1p/p1n2np1/1p1Bp3/4P3/1QPP1N2/PP3PPP/RNB1K2R b KQkq - 1 10", "prompt": "FEN: r1b1kb1r/2ppqp1p/p1n2np1/1p1Bp3/4P3/1QPP1N2/PP3PPP/RNB1K2R b KQkq - 1 10\nWhat is the material count for both sides?", "gold_answer": "White (16 pieces): 2 bishops, 1 king, 2 knights, 8 pawns, 1 queen, 2 rooks. Black (16 pieces): 2 bishops, 1 king, 2 knights, 8 pawns, 1 queen, 2 rooks. Material is equal.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00479", "split": "perception", "task_type": "square_lookup", "fen": "r1bqk2r/ppppnpbp/2n3p1/1B2p3/3PP3/2P2N2/PP3PPP/RNBQ1RK1 b kq - 0 6", "prompt": "FEN: r1bqk2r/ppppnpbp/2n3p1/1B2p3/3PP3/2P2N2/PP3PPP/RNBQ1RK1 b kq - 0 6\nWhat is on h2?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "h2=white pawn", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "h2", "diagnostic": true, "hard_gate": false, "square": "h2"}} {"example_id": "perception_00480", "split": "perception", "task_type": "rank_lookup", "fen": "r1bqkb1r/pp3ppp/2n5/2ppPp2/3P4/2P2N2/PP3PPP/RNBQK2R w KQkq -", "prompt": "FEN: r1bqkb1r/pp3ppp/2n5/2ppPp2/3P4/2P2N2/PP3PPP/RNBQK2R w KQkq -\nWhat is the compressed FEN row for rank 2?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 2: PP3PPP", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "2", "_rank_lookup_row": "PP3PPP", "diagnostic": true, "hard_gate": false, "rank": "2", "fen_rank_row": "PP3PPP"}} {"example_id": "perception_00481", "split": "perception", "task_type": "square_coordinates", "fen": "r2q1rk1/pbppbppp/np2pn2/8/3P4/1P2PN2/P1PNBPPP/R1BQ1RK1 b - - 0 8", "prompt": "FEN: r2q1rk1/pbppbppp/np2pn2/8/3P4/1P2PN2/P1PNBPPP/R1BQ1RK1 b - - 0 8\nFor square b7, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "b7: file=b; rank=7; fen_row_from_top=2; file_index=2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "b7", "diagnostic": true, "hard_gate": false, "square": "b7"}} {"example_id": "perception_00482", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r1bq1bnr/pppk1Bpp/2n5/8/3P4/1Q2Pp2/PP3PPP/RNB1K2R w KQ -", "prompt": "FEN: r1bq1bnr/pppk1Bpp/2n5/8/3P4/1Q2Pp2/PP3PPP/RNB1K2R w KQ -\nCompressed rank 2 row: PP3PPP\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 2: a=P; b=P; c=1; d=1; e=1; f=P; g=P; h=P", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "2", "_fen_rank_expansion_row": "PP3PPP", "diagnostic": true, "hard_gate": false, "rank": "2", "fen_rank_row": "PP3PPP"}} {"example_id": "perception_00483", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r4r2/7p/6nk/pp3p1b/8/PB3PR1/1P1B3K/8 b - - 2 34", "prompt": "Rank 7 row before: 7p\nFile g changes from 1 to k. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 7: 7p -> 6kp", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "h6g7", "_fen_rank_cell_edit_square": "g7", "_fen_rank_cell_edit_rank": "7", "_fen_rank_cell_edit_file": "g", "_fen_rank_cell_edit_before_row": "7p", "_fen_rank_cell_edit_after_row": "6kp", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "k", "diagnostic": true, "hard_gate": false, "move": "h6g7", "square": "g7", "rank": "7", "file": "g", "before_row": "7p", "after_row": "6kp", "before_fen": "1", "after_fen": "k"}} {"example_id": "perception_00484", "split": "perception", "task_type": "fen_board_edit", "fen": "r1bqk1nr/pp2ppbp/2np2p1/2p5/2B1P3/5N1P/PPPP1PP1/RNBQ1RK1 w kq - 3 6", "prompt": "Board FEN before: r1bqk1nr/pp2ppbp/2np2p1/2p5/2B1P3/5N1P/PPPP1PP1/RNBQ1RK1\nApply square edits: g1 K->1; h2 1->K\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: r1bqk1nr/pp2ppbp/2np2p1/2p5/2B1P3/5N1P/PPPP1PPK/RNBQ1R2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "g1h2", "_fen_board_edit_board_fen_before": "r1bqk1nr/pp2ppbp/2np2p1/2p5/2B1P3/5N1P/PPPP1PP1/RNBQ1RK1", "_fen_board_edit_board_fen_after": "r1bqk1nr/pp2ppbp/2np2p1/2p5/2B1P3/5N1P/PPPP1PPK/RNBQ1R2", "_fen_board_edit_edit_text": "g1 K->1; h2 1->K", "_fen_board_edit_changed_squares": [{"square": "g1", "before": "white king", "after": "empty", "before_fen": "K", "after_fen": "1"}, {"square": "h2", "before": "empty", "after": "white king", "before_fen": "1", "after_fen": "K"}], "diagnostic": true, "hard_gate": false, "move": "g1h2", "board_fen_before": "r1bqk1nr/pp2ppbp/2np2p1/2p5/2B1P3/5N1P/PPPP1PP1/RNBQ1RK1", "board_fen_after": "r1bqk1nr/pp2ppbp/2np2p1/2p5/2B1P3/5N1P/PPPP1PPK/RNBQ1R2", "edit_text": "g1 K->1; h2 1->K", "changed_squares": [{"square": "g1", "before": "white king", "after": "empty", "before_fen": "K", "after_fen": "1"}, {"square": "h2", "before": "empty", "after": "white king", "before_fen": "1", "after_fen": "K"}]}} {"example_id": "perception_00485", "split": "perception", "task_type": "move_square_edits", "fen": "8/8/4bkPK/5p2/8/8/6P1/8 w - -", "prompt": "Starting FEN: 8/8/4bkPK/5p2/8/8/6P1/8 w - -\nMove: h6h5\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: h6=white king; h5=empty.\nSquares: h6 white king->empty; h5 empty->white king.\nRanks: rank 6 h K->1; rank 5 h 1->K.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "h6h5", "diagnostic": true, "hard_gate": false, "move": "h6h5"}} {"example_id": "perception_00486", "split": "perception", "task_type": "fen_assembly", "fen": "r3q2r/1bR2pkp/pp3b2/3Pp3/6Q1/6P1/PP3PBP/5RK1 b - -", "prompt": "Starting FEN: r3q2r/1bR2pkp/pp3b2/3Pp3/6Q1/6P1/PP3PBP/5RK1 b - - 0 1\nMove: g7f8\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black king g7f8.\nLookup: g7=black king; f8=empty.\nSquares: g7 black king->empty; f8 empty->black king.\nRanks: rank 7 g k->1; rank 8 f 1->k.\nResult FEN: r3qk1r/1bR2p1p/pp3b2/3Pp3/6Q1/6P1/PP3PBP/5RK1 w - - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "g7f8", "diagnostic": true, "hard_gate": false, "move": "g7f8"}} {"example_id": "perception_00487", "split": "perception", "task_type": "fen_row_application", "fen": "r2qk2r/1pp1bppp/p1n5/3pPb2/3P4/1Qn1BN1P/PP2BPP1/R4RK1 w kq -", "prompt": "Starting FEN: r2qk2r/1pp1bppp/p1n5/3pPb2/3P4/1Qn1BN1P/PP2BPP1/R4RK1 w kq - 0 1\nMove: f3h4\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: kq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 3 1Qn1BN1P->1Qn1B2P; rank 4 3P4->3P3N.\nResult FEN: r2qk2r/1pp1bppp/p1n5/3pPb2/3P3N/1Qn1B2P/PP2BPP1/R4RK1 b kq - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "f3h4", "_fen_row_application_rank_rewrites": [{"rank": "3", "before": "1Qn1BN1P", "after": "1Qn1B2P"}, {"rank": "4", "before": "3P4", "after": "3P3N"}], "diagnostic": true, "hard_gate": false, "move": "f3h4", "rank_rewrites": [{"rank": "3", "before": "1Qn1BN1P", "after": "1Qn1B2P"}, {"rank": "4", "before": "3P4", "after": "3P3N"}]}} {"example_id": "perception_00488", "split": "perception", "task_type": "state_tracking", "fen": "r1bqk2r/ppp2ppp/2n1pn2/3p2B1/1bPP4/1QN5/PP2PPPP/R3KBNR w KQkq -", "prompt": "Starting FEN: r1bqk2r/ppp2ppp/2n1pn2/3p2B1/1bPP4/1QN5/PP2PPPP/R3KBNR w KQkq - 0 1\nAfter the moves e1d1, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r1bqk2r/ppp2ppp/2n1pn2/3p2B1/1bPP4/1QN5/PP2PPPP/R2K1BNR b kq - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "e1d1", "_state_tracking_result": "r1bqk2r/ppp2ppp/2n1pn2/3p2B1/1bPP4/1QN5/PP2PPPP/R2K1BNR b kq - 1 1"}} {"example_id": "perception_00489", "split": "perception", "task_type": "material_inventory", "fen": "r4rk1/ppqb1pp1/2nbp2p/2pnN3/3P1B2/2P3P1/PPN1QPBP/R3R1K1 w - -", "prompt": "FEN: r4rk1/ppqb1pp1/2nbp2p/2pnN3/3P1B2/2P3P1/PPN1QPBP/R3R1K1 w - -\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=e2; rook=a1,e1; bishop=g2,f4; knight=c2,e5; pawn=a2,b2,f2,h2,c3,g3,d4.\nBlack inventory: king=g8; queen=c7; rook=a8,f8; bishop=d6,d7; knight=d5,c6; pawn=c5,e6,h6,a7,b7,f7,g7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00490", "split": "perception", "task_type": "material_piece_counts", "fen": "2r2n1r/p3b1p1/2p2pk1/2PP2p1/3P4/1N2P1P1/P2B3P/1R3RK1 b - - 0 24", "prompt": "FEN: 2r2n1r/p3b1p1/2p2pk1/2PP2p1/3P4/1N2P1P1/P2B3P/1R3RK1 b - - 0 24\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=2; bishop=1; knight=1; pawn=7.\nBlack counts: king=1; queen=0; rook=2; bishop=1; knight=1; pawn=5.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00491", "split": "perception", "task_type": "material_value_totals", "fen": "2k2r2/pppr2pp/8/3q2B1/1P1p1b2/P2P4/5P2/1R1QR1K1 w - - 0 22", "prompt": "FEN: 2k2r2/pppr2pp/8/3q2B1/1P1p1b2/P2P4/5P2/1R1QR1K1 w - - 0 22\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=3; knight=0; pawn=4; total=26.\nBlack values: king=0; queen=9; rook=10; bishop=3; knight=0; pawn=6; total=28.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00492", "split": "perception", "task_type": "material_balance_trace", "fen": "r3rnk1/pbq2p2/1p2p2Q/4P3/8/2PB4/P4PPP/2R1R1K1 b - -", "prompt": "FEN: r3rnk1/pbq2p2/1p2p2Q/4P3/8/2PB4/P4PPP/2R1R1K1 b - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=h6; rook=c1,e1; bishop=d3; knight=none; pawn=a2,f2,g2,h2,c3,e5 | black king=g8; queen=c7; rook=a8,e8; bishop=b7; knight=f8; pawn=b6,e6,a7,f7\nCounts: white king=1; queen=1; rook=2; bishop=1; knight=0; pawn=6 | black king=1; queen=1; rook=2; bishop=1; knight=1; pawn=4\nValues: white total=28; black total=29\nBalance: Black is up 1 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00493", "split": "perception", "task_type": "multi_state_tracking", "fen": "8/4R3/1k6/1p5p/1p6/8/PP6/K7 w - - 1 46", "prompt": "Starting FEN: 8/4R3/1k6/1p5p/1p6/8/PP6/K7 w - - 1 46\nAfter the moves e7g7 b6a5 g7g1, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 46\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 8/8/8/kp5p/1p6/8/PP6/K5R1 b - - 4 47", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "e7g7 b6a5 g7g1", "_multi_state_tracking_result": "8/8/8/kp5p/1p6/8/PP6/K5R1 b - - 4 47", "diagnostic": true, "hard_gate": false, "moves": "e7g7 b6a5 g7g1"}} {"example_id": "perception_00494", "split": "perception", "task_type": "board_print", "fen": "7k/5p1p/1p6/p7/P1P3r1/R7/KP1qp3/8 w - - 0 41", "prompt": "Position (FEN): 7k/5p1p/1p6/p7/P1P3r1/R7/KP1qp3/8 w - - 0 41\nShow me the board.", "gold_answer": "8 . . . . . . . k\n7 . . . . . p . p\n6 . p . . . . . .\n5 p . . . . . . .\n4 P . P . . . r .\n3 R . . . . . . .\n2 K P . q p . . .\n1 . . . . . . . .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00495", "split": "perception", "task_type": "board_to_fen", "fen": "r3k1nr/p1p2p2/1p1p3p/3Ppq2/4n3/P3BP2/2Q3P1/4KB1R w kq - 0 24", "prompt": "Here is the current board:\n8 r . . . k . n r\n7 p . p . . p . .\n6 . p . p . . . p\n5 . . . P p q . .\n4 . . . . n . . .\n3 P . . . B P . .\n2 . . Q . . . P .\n1 . . . . K B . R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: kq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 24\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r3k1nr/p1p2p2/1p1p3p/3Ppq2/4n3/P3BP2/2Q3P1/4KB1R w kq - 0 24", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00496", "split": "perception", "task_type": "piece_id", "fen": "5n1b/8/8/8/2N5/1kpK4/8/1N6 b - - 16 67", "prompt": "FEN: 5n1b/8/8/8/2N5/1kpK4/8/1N6 b - - 16 67\nWhat piece is on f8?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black knight", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "f8"}} {"example_id": "perception_00497", "split": "perception", "task_type": "material_count", "fen": "6Q1/8/2N5/8/1P4k1/3K3p/8/8 b - - 2 48", "prompt": "FEN: 6Q1/8/2N5/8/1P4k1/3K3p/8/8 b - - 2 48\nWhat is the material count for both sides?", "gold_answer": "White (4 pieces): 1 king, 1 knight, 1 pawn, 1 queen. Black (2 pieces): 1 king, 1 pawn. White is up 12 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00498", "split": "perception", "task_type": "square_lookup", "fen": "8/8/8/1Q6/8/4K3/3n4/4k3 w - -", "prompt": "FEN: 8/8/8/1Q6/8/4K3/3n4/4k3 w - -\nWhat is on b7?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "b7=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "b7", "diagnostic": true, "hard_gate": false, "square": "b7"}} {"example_id": "perception_00499", "split": "perception", "task_type": "rank_lookup", "fen": "r1b1q1k1/1p2rpp1/p3pP1p/3p3Q/3P4/2PBN2P/PP4P1/R5K1 b - -", "prompt": "FEN: r1b1q1k1/1p2rpp1/p3pP1p/3p3Q/3P4/2PBN2P/PP4P1/R5K1 b - -\nWhat is the compressed FEN row for rank 7?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 7: 1p2rpp1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "7", "_rank_lookup_row": "1p2rpp1", "diagnostic": true, "hard_gate": false, "rank": "7", "fen_rank_row": "1p2rpp1"}} {"example_id": "perception_00500", "split": "perception", "task_type": "square_coordinates", "fen": "r6r/pp2bRpp/4k3/3p4/8/2N5/PP4PP/R1B1K3 w Q -", "prompt": "FEN: r6r/pp2bRpp/4k3/3p4/8/2N5/PP4PP/R1B1K3 w Q -\nFor square c3, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "c3: file=c; rank=3; fen_row_from_top=6; file_index=3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "c3", "diagnostic": true, "hard_gate": false, "square": "c3"}} {"example_id": "perception_00501", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r3r1k1/pp3pp1/7p/8/8/1PN5/1P4PP/4R2K w - -", "prompt": "FEN: r3r1k1/pp3pp1/7p/8/8/1PN5/1P4PP/4R2K w - -\nCompressed rank 3 row: 1PN5\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 3: a=1; b=P; c=N; d=1; e=1; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "3", "_fen_rank_expansion_row": "1PN5", "diagnostic": true, "hard_gate": false, "rank": "3", "fen_rank_row": "1PN5"}} {"example_id": "perception_00502", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r4rk1/p1p3pp/2n1p3/3pP3/2b2P2/4Q1P1/2qN1KBP/1R6 b - - 3 24", "prompt": "Rank 7 row before: p1p3pp\nFile h changes from p to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 7: p1p3pp -> p1p3p1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "h7h6", "_fen_rank_cell_edit_square": "h7", "_fen_rank_cell_edit_rank": "7", "_fen_rank_cell_edit_file": "h", "_fen_rank_cell_edit_before_row": "p1p3pp", "_fen_rank_cell_edit_after_row": "p1p3p1", "_fen_rank_cell_edit_before_fen": "p", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "h7h6", "square": "h7", "rank": "7", "file": "h", "before_row": "p1p3pp", "after_row": "p1p3p1", "before_fen": "p", "after_fen": "1"}} {"example_id": "perception_00503", "split": "perception", "task_type": "fen_board_edit", "fen": "2r1rR1k/1b5p/p5p1/8/3q4/PB1Q4/5PPP/6K1 b - -", "prompt": "Board FEN before: 2r1rR1k/1b5p/p5p1/8/3q4/PB1Q4/5PPP/6K1\nApply square edits: h8 k->1; g7 1->k\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 2r1rR2/1b4kp/p5p1/8/3q4/PB1Q4/5PPP/6K1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "h8g7", "_fen_board_edit_board_fen_before": "2r1rR1k/1b5p/p5p1/8/3q4/PB1Q4/5PPP/6K1", "_fen_board_edit_board_fen_after": "2r1rR2/1b4kp/p5p1/8/3q4/PB1Q4/5PPP/6K1", "_fen_board_edit_edit_text": "h8 k->1; g7 1->k", "_fen_board_edit_changed_squares": [{"square": "h8", "before": "black king", "after": "empty", "before_fen": "k", "after_fen": "1"}, {"square": "g7", "before": "empty", "after": "black king", "before_fen": "1", "after_fen": "k"}], "diagnostic": true, "hard_gate": false, "move": "h8g7", "board_fen_before": "2r1rR1k/1b5p/p5p1/8/3q4/PB1Q4/5PPP/6K1", "board_fen_after": "2r1rR2/1b4kp/p5p1/8/3q4/PB1Q4/5PPP/6K1", "edit_text": "h8 k->1; g7 1->k", "changed_squares": [{"square": "h8", "before": "black king", "after": "empty", "before_fen": "k", "after_fen": "1"}, {"square": "g7", "before": "empty", "after": "black king", "before_fen": "1", "after_fen": "k"}]}} {"example_id": "perception_00504", "split": "perception", "task_type": "move_square_edits", "fen": "8/p4k1p/5p2/2R5/8/3p3P/4r1P1/3K4 w - - 1 48", "prompt": "Starting FEN: 8/p4k1p/5p2/2R5/8/3p3P/4r1P1/3K4 w - - 1 48\nMove: c5c1\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: c5=white rook; c1=empty.\nSquares: c5 white rook->empty; c1 empty->white rook.\nRanks: rank 5 c R->1; rank 1 c 1->R.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "c5c1", "diagnostic": true, "hard_gate": false, "move": "c5c1"}} {"example_id": "perception_00505", "split": "perception", "task_type": "fen_assembly", "fen": "K7/8/8/8/8/6Q1/6p1/5k2 w - -", "prompt": "Starting FEN: K7/8/8/8/8/6Q1/6p1/5k2 w - - 0 1\nMove: g3g6\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white queen g3g6.\nLookup: g3=white queen; g6=empty.\nSquares: g3 white queen->empty; g6 empty->white queen.\nRanks: rank 3 g Q->1; rank 6 g 1->Q.\nResult FEN: K7/8/6Q1/8/8/8/6p1/5k2 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "g3g6", "diagnostic": true, "hard_gate": false, "move": "g3g6"}} {"example_id": "perception_00506", "split": "perception", "task_type": "fen_row_application", "fen": "r1q2b1r/p1pbkBpp/8/1p3pN1/3nnB2/2N5/PPP3PP/R2QR1K1 w - - 0 14", "prompt": "Starting FEN: r1q2b1r/p1pbkBpp/8/1p3pN1/3nnB2/2N5/PPP3PP/R2QR1K1 w - - 0 14\nMove: g5h3\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 14\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 5 1p3pN1->1p3p2; rank 3 2N5->2N4N.\nResult FEN: r1q2b1r/p1pbkBpp/8/1p3p2/3nnB2/2N4N/PPP3PP/R2QR1K1 b - - 1 14", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "g5h3", "_fen_row_application_rank_rewrites": [{"rank": "5", "before": "1p3pN1", "after": "1p3p2"}, {"rank": "3", "before": "2N5", "after": "2N4N"}], "diagnostic": true, "hard_gate": false, "move": "g5h3", "rank_rewrites": [{"rank": "5", "before": "1p3pN1", "after": "1p3p2"}, {"rank": "3", "before": "2N5", "after": "2N4N"}]}} {"example_id": "perception_00507", "split": "perception", "task_type": "state_tracking", "fen": "8/8/8/5K2/3k4/8/3p4/1Q6 b - -", "prompt": "Starting FEN: 8/8/8/5K2/3k4/8/3p4/1Q6 b - - 0 1\nAfter the moves d4d5, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 8/8/8/3k1K2/8/8/3p4/1Q6 w - - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "d4d5", "_state_tracking_result": "8/8/8/3k1K2/8/8/3p4/1Q6 w - - 1 2"}} {"example_id": "perception_00508", "split": "perception", "task_type": "material_inventory", "fen": "rnb1k1nr/pppq1ppp/3b4/8/3P4/5N2/PPP1BPPP/RNBQ1RK1 b kq - 3 7", "prompt": "FEN: rnb1k1nr/pppq1ppp/3b4/8/3P4/5N2/PPP1BPPP/RNBQ1RK1 b kq - 3 7\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=d1; rook=a1,f1; bishop=c1,e2; knight=b1,f3; pawn=a2,b2,c2,f2,g2,h2,d4.\nBlack inventory: king=e8; queen=d7; rook=a8,h8; bishop=d6,c8; knight=b8,g8; pawn=a7,b7,c7,f7,g7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00509", "split": "perception", "task_type": "material_piece_counts", "fen": "8/6pk/3R2pp/r7/3P2P1/7P/1r3P2/5RK1 w - -", "prompt": "FEN: 8/6pk/3R2pp/r7/3P2P1/7P/1r3P2/5RK1 w - -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=2; bishop=0; knight=0; pawn=4.\nBlack counts: king=1; queen=0; rook=2; bishop=0; knight=0; pawn=3.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00510", "split": "perception", "task_type": "material_value_totals", "fen": "1r1q1rk1/5p1p/p1n1bbp1/4p3/2p1P3/2P2Q1N/P2N1PPP/2RB1RK1 w - - 0 19", "prompt": "FEN: 1r1q1rk1/5p1p/p1n1bbp1/4p3/2p1P3/2P2Q1N/P2N1PPP/2RB1RK1 w - - 0 19\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=3; knight=6; pawn=6; total=34.\nBlack values: king=0; queen=9; rook=10; bishop=6; knight=3; pawn=6; total=34.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00511", "split": "perception", "task_type": "material_balance_trace", "fen": "r1bqk2r/pp3ppp/2p1pn2/6B1/2QPP3/2N2N2/PP3PPP/R3K2R b KQkq - 2 10", "prompt": "FEN: r1bqk2r/pp3ppp/2p1pn2/6B1/2QPP3/2N2N2/PP3PPP/R3K2R b KQkq - 2 10\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=e1; queen=c4; rook=a1,h1; bishop=g5; knight=c3,f3; pawn=a2,b2,f2,g2,h2,d4,e4 | black king=e8; queen=d8; rook=a8,h8; bishop=c8; knight=f6; pawn=c6,e6,a7,b7,f7,g7,h7\nCounts: white king=1; queen=1; rook=2; bishop=1; knight=2; pawn=7 | black king=1; queen=1; rook=2; bishop=1; knight=1; pawn=7\nValues: white total=35; black total=32\nBalance: White is up 3 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00512", "split": "perception", "task_type": "multi_state_tracking", "fen": "rnbq1rk1/ppp1ppbp/3p2p1/6Bn/3P4/4PN2/PPPNBPPP/R2QK2R b KQ -", "prompt": "Starting FEN: rnbq1rk1/ppp1ppbp/3p2p1/6Bn/3P4/4PN2/PPPNBPPP/R2QK2R b KQ - 0 1\nAfter the moves c8g4 g2g3, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rn1q1rk1/ppp1ppbp/3p2p1/6Bn/3P2b1/4PNP1/PPPNBP1P/R2QK2R b KQ - 0 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "c8g4 g2g3", "_multi_state_tracking_result": "rn1q1rk1/ppp1ppbp/3p2p1/6Bn/3P2b1/4PNP1/PPPNBP1P/R2QK2R b KQ - 0 2", "diagnostic": true, "hard_gate": false, "moves": "c8g4 g2g3"}} {"example_id": "perception_00513", "split": "perception", "task_type": "board_print", "fen": "rr4k1/3p2bp/2pNp1p1/2P1Pp2/qP3P1P/pR2B1P1/P3Q3/7K w - - 4 27", "prompt": "Position (FEN): rr4k1/3p2bp/2pNp1p1/2P1Pp2/qP3P1P/pR2B1P1/P3Q3/7K w - - 4 27\nShow me the board.", "gold_answer": "8 r r . . . . k .\n7 . . . p . . b p\n6 . . p N p . p .\n5 . . P . P p . .\n4 q P . . . P . P\n3 p R . . B . P .\n2 P . . . Q . . .\n1 . . . . . . . K\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00514", "split": "perception", "task_type": "board_to_fen", "fen": "rn1qkb1r/p2b1ppp/1p1p1n2/2pNp3/2P1P3/1Q6/PP1P1PPP/R1B1KBNR w KQkq - 0 7", "prompt": "Here is the current board:\n8 r n . q k b . r\n7 p . . b . p p p\n6 . p . p . n . .\n5 . . p N p . . .\n4 . . P . P . . .\n3 . Q . . . . . .\n2 P P . P . P P P\n1 R . B . K B N R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 7\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "rn1qkb1r/p2b1ppp/1p1p1n2/2pNp3/2P1P3/1Q6/PP1P1PPP/R1B1KBNR w KQkq - 0 7", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00515", "split": "perception", "task_type": "piece_id", "fen": "2r1k2r/pp3pp1/4bn2/n2pN3/7P/B1PP4/P3PPBP/2R2RK1 b k -", "prompt": "FEN: 2r1k2r/pp3pp1/4bn2/n2pN3/7P/B1PP4/P3PPBP/2R2RK1 b k -\nWhat piece is on e2?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "e2"}} {"example_id": "perception_00516", "split": "perception", "task_type": "material_count", "fen": "r3k3/p1b1qp2/2p4r/2Pp2pp/P2Pp1b1/2B1P3/3NNQ2/R3K1R1 b q -", "prompt": "FEN: r3k3/p1b1qp2/2p4r/2Pp2pp/P2Pp1b1/2B1P3/3NNQ2/R3K1R1 b q -\nWhat is the material count for both sides?", "gold_answer": "White (11 pieces): 1 bishop, 1 king, 2 knights, 4 pawns, 1 queen, 2 rooks. Black (13 pieces): 2 bishops, 1 king, 7 pawns, 1 queen, 2 rooks. Material is equal.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00517", "split": "perception", "task_type": "square_lookup", "fen": "r2q1r1k/2p4p/p1n3p1/1p2p3/6N1/1BpQ1P2/PP5P/R1B3K1 w - -", "prompt": "FEN: r2q1r1k/2p4p/p1n3p1/1p2p3/6N1/1BpQ1P2/PP5P/R1B3K1 w - -\nWhat is on b7?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "b7=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "b7", "diagnostic": true, "hard_gate": false, "square": "b7"}} {"example_id": "perception_00518", "split": "perception", "task_type": "rank_lookup", "fen": "Rr3r2/1P4pk/6pp/5n2/8/2B1P1P1/1Pq2PBP/R5K1 w - - 5 29", "prompt": "FEN: Rr3r2/1P4pk/6pp/5n2/8/2B1P1P1/1Pq2PBP/R5K1 w - - 5 29\nWhat is the compressed FEN row for rank 6?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 6: 6pp", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "6", "_rank_lookup_row": "6pp", "diagnostic": true, "hard_gate": false, "rank": "6", "fen_rank_row": "6pp"}} {"example_id": "perception_00519", "split": "perception", "task_type": "square_coordinates", "fen": "rnbqkbnr/3p1ppp/p3p3/1pp5/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 0 5", "prompt": "FEN: rnbqkbnr/3p1ppp/p3p3/1pp5/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 0 5\nFor square a7, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "a7: file=a; rank=7; fen_row_from_top=2; file_index=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "a7", "diagnostic": true, "hard_gate": false, "square": "a7"}} {"example_id": "perception_00520", "split": "perception", "task_type": "fen_rank_expansion", "fen": "6k1/p4p1p/2Q1p1p1/2P5/P2r2P1/4RB1n/1r1q1P2/5RK1 w - -", "prompt": "FEN: 6k1/p4p1p/2Q1p1p1/2P5/P2r2P1/4RB1n/1r1q1P2/5RK1 w - -\nCompressed rank 7 row: p4p1p\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 7: a=p; b=1; c=1; d=1; e=1; f=p; g=1; h=p", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "7", "_fen_rank_expansion_row": "p4p1p", "diagnostic": true, "hard_gate": false, "rank": "7", "fen_rank_row": "p4p1p"}} {"example_id": "perception_00521", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "8/8/8/P7/2k5/4pp2/r7/4K3 b - -", "prompt": "Rank 2 row before: r7\nFile b changes from 1 to r. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 2: r7 -> 1r6", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "a2b2", "_fen_rank_cell_edit_square": "b2", "_fen_rank_cell_edit_rank": "2", "_fen_rank_cell_edit_file": "b", "_fen_rank_cell_edit_before_row": "r7", "_fen_rank_cell_edit_after_row": "1r6", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "r", "diagnostic": true, "hard_gate": false, "move": "a2b2", "square": "b2", "rank": "2", "file": "b", "before_row": "r7", "after_row": "1r6", "before_fen": "1", "after_fen": "r"}} {"example_id": "perception_00522", "split": "perception", "task_type": "fen_board_edit", "fen": "2r2rk1/1p2bpp1/3pq2p/2p4P/3QP1P1/1P1P1B2/P1P2P2/R3K2R w KQ - 0 21", "prompt": "Board FEN before: 2r2rk1/1p2bpp1/3pq2p/2p4P/3QP1P1/1P1P1B2/P1P2P2/R3K2R\nApply square edits: d4 Q->1; c3 1->Q\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 2r2rk1/1p2bpp1/3pq2p/2p4P/4P1P1/1PQP1B2/P1P2P2/R3K2R", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "d4c3", "_fen_board_edit_board_fen_before": "2r2rk1/1p2bpp1/3pq2p/2p4P/3QP1P1/1P1P1B2/P1P2P2/R3K2R", "_fen_board_edit_board_fen_after": "2r2rk1/1p2bpp1/3pq2p/2p4P/4P1P1/1PQP1B2/P1P2P2/R3K2R", "_fen_board_edit_edit_text": "d4 Q->1; c3 1->Q", "_fen_board_edit_changed_squares": [{"square": "d4", "before": "white queen", "after": "empty", "before_fen": "Q", "after_fen": "1"}, {"square": "c3", "before": "empty", "after": "white queen", "before_fen": "1", "after_fen": "Q"}], "diagnostic": true, "hard_gate": false, "move": "d4c3", "board_fen_before": "2r2rk1/1p2bpp1/3pq2p/2p4P/3QP1P1/1P1P1B2/P1P2P2/R3K2R", "board_fen_after": "2r2rk1/1p2bpp1/3pq2p/2p4P/4P1P1/1PQP1B2/P1P2P2/R3K2R", "edit_text": "d4 Q->1; c3 1->Q", "changed_squares": [{"square": "d4", "before": "white queen", "after": "empty", "before_fen": "Q", "after_fen": "1"}, {"square": "c3", "before": "empty", "after": "white queen", "before_fen": "1", "after_fen": "Q"}]}} {"example_id": "perception_00523", "split": "perception", "task_type": "move_square_edits", "fen": "r1b2rk1/1p3ppp/p1n1pq2/2bp4/4P3/1PP5/PB1QBPPP/RN3RK1 w - -", "prompt": "Starting FEN: r1b2rk1/1p3ppp/p1n1pq2/2bp4/4P3/1PP5/PB1QBPPP/RN3RK1 w - -\nMove: h2h3\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: h2=white pawn; h3=empty.\nSquares: h2 white pawn->empty; h3 empty->white pawn.\nRanks: rank 2 h P->1; rank 3 h 1->P.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "h2h3", "diagnostic": true, "hard_gate": false, "move": "h2h3"}} {"example_id": "perception_00524", "split": "perception", "task_type": "fen_assembly", "fen": "r4rk1/1p1b1ppp/pn2p3/2bpP3/3N1P2/2P2N2/PP4PP/R1B2R1K w - - 2 16", "prompt": "Starting FEN: r4rk1/1p1b1ppp/pn2p3/2bpP3/3N1P2/2P2N2/PP4PP/R1B2R1K w - - 2 16\nMove: f1g1\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 2\nFullmove number: 16\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white rook f1g1.\nLookup: f1=white rook; g1=empty.\nSquares: f1 white rook->empty; g1 empty->white rook.\nRanks: rank 1 f R->1; rank 1 g 1->R.\nResult FEN: r4rk1/1p1b1ppp/pn2p3/2bpP3/3N1P2/2P2N2/PP4PP/R1B3RK b - - 3 16", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "f1g1", "diagnostic": true, "hard_gate": false, "move": "f1g1"}} {"example_id": "perception_00525", "split": "perception", "task_type": "fen_row_application", "fen": "r1bk1b1r/pp4pp/2p2n2/3pq3/2B1p3/2N1B3/PPP2PPP/R2Q1RK1 w - -", "prompt": "Starting FEN: r1bk1b1r/pp4pp/2p2n2/3pq3/2B1p3/2N1B3/PPP2PPP/R2Q1RK1 w - - 0 1\nMove: c3b5\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 3 2N1B3->4B3; rank 5 3pq3->1N1pq3.\nResult FEN: r1bk1b1r/pp4pp/2p2n2/1N1pq3/2B1p3/4B3/PPP2PPP/R2Q1RK1 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "c3b5", "_fen_row_application_rank_rewrites": [{"rank": "3", "before": "2N1B3", "after": "4B3"}, {"rank": "5", "before": "3pq3", "after": "1N1pq3"}], "diagnostic": true, "hard_gate": false, "move": "c3b5", "rank_rewrites": [{"rank": "3", "before": "2N1B3", "after": "4B3"}, {"rank": "5", "before": "3pq3", "after": "1N1pq3"}]}} {"example_id": "perception_00526", "split": "perception", "task_type": "state_tracking", "fen": "6k1/p1p3p1/2p5/8/3p4/1q6/3KR3/8 b - -", "prompt": "Starting FEN: 6k1/p1p3p1/2p5/8/3p4/1q6/3KR3/8 b - - 0 1\nAfter the moves b3e3, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 6k1/p1p3p1/2p5/8/3p4/4q3/3KR3/8 w - - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "b3e3", "_state_tracking_result": "6k1/p1p3p1/2p5/8/3p4/4q3/3KR3/8 w - - 1 2"}} {"example_id": "perception_00527", "split": "perception", "task_type": "material_inventory", "fen": "6r1/k1pbbp2/Pn1p1n2/B2PpP2/2P1P1pr/6N1/3N1KBP/R6R w - - 1 29", "prompt": "FEN: 6r1/k1pbbp2/Pn1p1n2/B2PpP2/2P1P1pr/6N1/3N1KBP/R6R w - - 1 29\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=f2; queen=none; rook=a1,h1; bishop=g2,a5; knight=d2,g3; pawn=h2,c4,e4,d5,f5,a6.\nBlack inventory: king=a7; queen=none; rook=h4,g8; bishop=d7,e7; knight=b6,f6; pawn=g4,e5,d6,c7,f7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00528", "split": "perception", "task_type": "material_piece_counts", "fen": "rnbqk2r/ppp1ppb1/3p1npp/8/2PP1B2/2N1P3/PP3PPP/R2QKBNR w KQkq -", "prompt": "FEN: rnbqk2r/ppp1ppb1/3p1npp/8/2PP1B2/2N1P3/PP3PPP/R2QKBNR w KQkq -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=8.\nBlack counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=8.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00529", "split": "perception", "task_type": "material_value_totals", "fen": "2r2rk1/ppq2ppp/3bp3/5b2/2BPnN1Q/1P2R2P/P4PP1/R1B3K1 b - - 7 21", "prompt": "FEN: 2r2rk1/ppq2ppp/3bp3/5b2/2BPnN1Q/1P2R2P/P4PP1/R1B3K1 b - - 7 21\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=6; knight=3; pawn=6; total=34.\nBlack values: king=0; queen=9; rook=10; bishop=6; knight=3; pawn=6; total=34.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00530", "split": "perception", "task_type": "material_balance_trace", "fen": "r2q1rk1/pb1n2bp/3pp1p1/1pp5/8/1PP2NP1/PB1Q1PBP/RN3RK1 b - -", "prompt": "FEN: r2q1rk1/pb1n2bp/3pp1p1/1pp5/8/1PP2NP1/PB1Q1PBP/RN3RK1 b - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=d2; rook=a1,f1; bishop=b2,g2; knight=b1,f3; pawn=a2,f2,h2,b3,c3,g3 | black king=g8; queen=d8; rook=a8,f8; bishop=b7,g7; knight=d7; pawn=b5,c5,d6,e6,g6,a7,h7\nCounts: white king=1; queen=1; rook=2; bishop=2; knight=2; pawn=6 | black king=1; queen=1; rook=2; bishop=2; knight=1; pawn=7\nValues: white total=37; black total=35\nBalance: White is up 2 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00531", "split": "perception", "task_type": "multi_state_tracking", "fen": "6k1/2p1rpp1/N6p/2BR4/8/1P6/P4PPb/5K2 w - - 0 25", "prompt": "Starting FEN: 6k1/2p1rpp1/N6p/2BR4/8/1P6/P4PPb/5K2 w - - 0 25\nAfter the moves c5e3 e7e4 d5d1, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 25\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 6k1/2p2pp1/N6p/8/4r3/1P2B3/P4PPb/3R1K2 b - - 3 26", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "c5e3 e7e4 d5d1", "_multi_state_tracking_result": "6k1/2p2pp1/N6p/8/4r3/1P2B3/P4PPb/3R1K2 b - - 3 26", "diagnostic": true, "hard_gate": false, "moves": "c5e3 e7e4 d5d1"}} {"example_id": "perception_00532", "split": "perception", "task_type": "board_print", "fen": "4Rnk1/p4ppp/1qpp4/8/8/1P3PP1/P1P1R2P/7K b - - 2 26", "prompt": "Position (FEN): 4Rnk1/p4ppp/1qpp4/8/8/1P3PP1/P1P1R2P/7K b - - 2 26\nShow me the board.", "gold_answer": "8 . . . . R n k .\n7 p . . . . p p p\n6 . q p p . . . .\n5 . . . . . . . .\n4 . . . . . . . .\n3 . P . . . P P .\n2 P . P . R . . P\n1 . . . . . . . K\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00533", "split": "perception", "task_type": "board_to_fen", "fen": "8/8/2k5/5R2/8/4K3/8/8 w - -", "prompt": "Here is the current board:\n8 . . . . . . . .\n7 . . . . . . . .\n6 . . k . . . . .\n5 . . . . . R . .\n4 . . . . . . . .\n3 . . . . K . . .\n2 . . . . . . . .\n1 . . . . . . . .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "8/8/2k5/5R2/8/4K3/8/8 w - - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00534", "split": "perception", "task_type": "piece_id", "fen": "r2b1r1k/6pp/p1n2p2/3N4/2p5/2N1P1P1/PP3P1P/R1B1R1K1 b - -", "prompt": "FEN: r2b1r1k/6pp/p1n2p2/3N4/2p5/2N1P1P1/PP3P1P/R1B1R1K1 b - -\nWhat piece is on c6?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black knight", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "c6"}} {"example_id": "perception_00535", "split": "perception", "task_type": "material_count", "fen": "4K3/3Q4/8/2kr4/8/8/8/8 w - -", "prompt": "FEN: 4K3/3Q4/8/2kr4/8/8/8/8 w - -\nWhat is the material count for both sides?", "gold_answer": "White (2 pieces): 1 king, 1 queen. Black (2 pieces): 1 king, 1 rook. White is up 4 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00536", "split": "perception", "task_type": "square_lookup", "fen": "rnbqkb1r/p2ppppp/5n2/1ppP4/P7/5N2/1PP1PPPP/RNBQKB1R b KQkq -", "prompt": "FEN: rnbqkb1r/p2ppppp/5n2/1ppP4/P7/5N2/1PP1PPPP/RNBQKB1R b KQkq -\nWhat is on f6?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "f6=black knight", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "f6", "diagnostic": true, "hard_gate": false, "square": "f6"}} {"example_id": "perception_00537", "split": "perception", "task_type": "rank_lookup", "fen": "rnb1k2r/ppq1nppp/2pb4/3p4/3P4/2NB3P/PPP1NPP1/R1BQ1RK1 b kq -", "prompt": "FEN: rnb1k2r/ppq1nppp/2pb4/3p4/3P4/2NB3P/PPP1NPP1/R1BQ1RK1 b kq -\nWhat is the compressed FEN row for rank 4?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 4: 3P4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "4", "_rank_lookup_row": "3P4", "diagnostic": true, "hard_gate": false, "rank": "4", "fen_rank_row": "3P4"}} {"example_id": "perception_00538", "split": "perception", "task_type": "square_coordinates", "fen": "rnbq1rk1/ppp2ppp/3bpn2/3p4/8/3PPN2/PPP1BPPP/RNBQ1RK1 w - -", "prompt": "FEN: rnbq1rk1/ppp2ppp/3bpn2/3p4/8/3PPN2/PPP1BPPP/RNBQ1RK1 w - -\nFor square a7, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "a7: file=a; rank=7; fen_row_from_top=2; file_index=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "a7", "diagnostic": true, "hard_gate": false, "square": "a7"}} {"example_id": "perception_00539", "split": "perception", "task_type": "fen_rank_expansion", "fen": "8/4kp2/7K/4Q3/8/3p4/8/8 b - - 0 59", "prompt": "FEN: 8/4kp2/7K/4Q3/8/3p4/8/8 b - - 0 59\nCompressed rank 2 row: 8\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 2: a=1; b=1; c=1; d=1; e=1; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "2", "_fen_rank_expansion_row": "8", "diagnostic": true, "hard_gate": false, "rank": "2", "fen_rank_row": "8"}} {"example_id": "perception_00540", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "5r2/6pk/4Q2p/1N1Pp3/4Pb2/5Pq1/PPR2KP1/6R1 w - - 7 31", "prompt": "Rank 2 row before: PPR2KP1\nFile f changes from K to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 2: PPR2KP1 -> PPR1K1P1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "f2e2", "_fen_rank_cell_edit_square": "f2", "_fen_rank_cell_edit_rank": "2", "_fen_rank_cell_edit_file": "f", "_fen_rank_cell_edit_before_row": "PPR2KP1", "_fen_rank_cell_edit_after_row": "PPR1K1P1", "_fen_rank_cell_edit_before_fen": "K", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "f2e2", "square": "f2", "rank": "2", "file": "f", "before_row": "PPR2KP1", "after_row": "PPR1K1P1", "before_fen": "K", "after_fen": "1"}} {"example_id": "perception_00541", "split": "perception", "task_type": "fen_board_edit", "fen": "r1bqkbnr/pp1p1ppp/2n1p3/8/3P1P2/5N2/PP2P1PP/RNBQKB1R b KQkq - 2 5", "prompt": "Board FEN before: r1bqkbnr/pp1p1ppp/2n1p3/8/3P1P2/5N2/PP2P1PP/RNBQKB1R\nApply square edits: d8 q->1; a5 1->q\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: r1b1kbnr/pp1p1ppp/2n1p3/q7/3P1P2/5N2/PP2P1PP/RNBQKB1R", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "d8a5", "_fen_board_edit_board_fen_before": "r1bqkbnr/pp1p1ppp/2n1p3/8/3P1P2/5N2/PP2P1PP/RNBQKB1R", "_fen_board_edit_board_fen_after": "r1b1kbnr/pp1p1ppp/2n1p3/q7/3P1P2/5N2/PP2P1PP/RNBQKB1R", "_fen_board_edit_edit_text": "d8 q->1; a5 1->q", "_fen_board_edit_changed_squares": [{"square": "d8", "before": "black queen", "after": "empty", "before_fen": "q", "after_fen": "1"}, {"square": "a5", "before": "empty", "after": "black queen", "before_fen": "1", "after_fen": "q"}], "diagnostic": true, "hard_gate": false, "move": "d8a5", "board_fen_before": "r1bqkbnr/pp1p1ppp/2n1p3/8/3P1P2/5N2/PP2P1PP/RNBQKB1R", "board_fen_after": "r1b1kbnr/pp1p1ppp/2n1p3/q7/3P1P2/5N2/PP2P1PP/RNBQKB1R", "edit_text": "d8 q->1; a5 1->q", "changed_squares": [{"square": "d8", "before": "black queen", "after": "empty", "before_fen": "q", "after_fen": "1"}, {"square": "a5", "before": "empty", "after": "black queen", "before_fen": "1", "after_fen": "q"}]}} {"example_id": "perception_00542", "split": "perception", "task_type": "move_square_edits", "fen": "6k1/6pp/2R5/8/1Pp5/2K4P/7r/8 w - -", "prompt": "Starting FEN: 6k1/6pp/2R5/8/1Pp5/2K4P/7r/8 w - -\nMove: c6d6\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: c6=white rook; d6=empty.\nSquares: c6 white rook->empty; d6 empty->white rook.\nRanks: rank 6 c R->1; rank 6 d 1->R.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "c6d6", "diagnostic": true, "hard_gate": false, "move": "c6d6"}} {"example_id": "perception_00543", "split": "perception", "task_type": "fen_assembly", "fen": "8/1r3p1k/4p3/R2pP1P1/1PpN3p/1bP4P/6P1/7K w - -", "prompt": "Starting FEN: 8/1r3p1k/4p3/R2pP1P1/1PpN3p/1bP4P/6P1/7K w - - 0 1\nMove: g2g3\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white pawn g2g3.\nLookup: g2=white pawn; g3=empty.\nSquares: g2 white pawn->empty; g3 empty->white pawn.\nRanks: rank 2 g P->1; rank 3 g 1->P.\nResult FEN: 8/1r3p1k/4p3/R2pP1P1/1PpN3p/1bP3PP/8/7K b - - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "g2g3", "diagnostic": true, "hard_gate": false, "move": "g2g3"}} {"example_id": "perception_00544", "split": "perception", "task_type": "fen_row_application", "fen": "rnbqk2r/pp2bppp/4pn2/2pp4/3PP3/2P2N2/PP1N1PPP/R1BQKB1R w KQkq -", "prompt": "Starting FEN: rnbqk2r/pp2bppp/4pn2/2pp4/3PP3/2P2N2/PP1N1PPP/R1BQKB1R w KQkq - 0 1\nMove: d2c4\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 2 PP1N1PPP->PP3PPP; rank 4 3PP3->2NPP3.\nResult FEN: rnbqk2r/pp2bppp/4pn2/2pp4/2NPP3/2P2N2/PP3PPP/R1BQKB1R b KQkq - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "d2c4", "_fen_row_application_rank_rewrites": [{"rank": "2", "before": "PP1N1PPP", "after": "PP3PPP"}, {"rank": "4", "before": "3PP3", "after": "2NPP3"}], "diagnostic": true, "hard_gate": false, "move": "d2c4", "rank_rewrites": [{"rank": "2", "before": "PP1N1PPP", "after": "PP3PPP"}, {"rank": "4", "before": "3PP3", "after": "2NPP3"}]}} {"example_id": "perception_00545", "split": "perception", "task_type": "state_tracking", "fen": "r1bq1rk1/ppp2pp1/2np1n1p/2b5/2B1P2B/2NP1N2/PPP3PP/R2QK2R b KQ -", "prompt": "Starting FEN: r1bq1rk1/ppp2pp1/2np1n1p/2b5/2B1P2B/2NP1N2/PPP3PP/R2QK2R b KQ - 0 1\nAfter the moves d8e7, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r1b2rk1/ppp1qpp1/2np1n1p/2b5/2B1P2B/2NP1N2/PPP3PP/R2QK2R w KQ - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "d8e7", "_state_tracking_result": "r1b2rk1/ppp1qpp1/2np1n1p/2b5/2B1P2B/2NP1N2/PPP3PP/R2QK2R w KQ - 1 2"}} {"example_id": "perception_00546", "split": "perception", "task_type": "material_inventory", "fen": "2r2rk1/1b3ppp/p2bpn2/1p1n4/2P5/1N2BN2/PP2BPPP/3RR1K1 b - -", "prompt": "FEN: 2r2rk1/1b3ppp/p2bpn2/1p1n4/2P5/1N2BN2/PP2BPPP/3RR1K1 b - -\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=none; rook=d1,e1; bishop=e2,e3; knight=b3,f3; pawn=a2,b2,f2,g2,h2,c4.\nBlack inventory: king=g8; queen=none; rook=c8,f8; bishop=d6,b7; knight=d5,f6; pawn=b5,a6,e6,f7,g7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00547", "split": "perception", "task_type": "material_piece_counts", "fen": "r3r1k1/pppq1ppp/1b6/3P4/2B2PP1/2P4P/PP1B3Q/2KR4 w - - 1 21", "prompt": "FEN: r3r1k1/pppq1ppp/1b6/3P4/2B2PP1/2P4P/PP1B3Q/2KR4 w - - 1 21\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=1; bishop=2; knight=0; pawn=7.\nBlack counts: king=1; queen=1; rook=2; bishop=1; knight=0; pawn=6.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00548", "split": "perception", "task_type": "material_value_totals", "fen": "r1b1r1k1/1p2Bppp/p3p3/3pP1Q1/n1p2P2/2q1PB2/P1P3PP/R4RK1 b - -", "prompt": "FEN: r1b1r1k1/1p2Bppp/p3p3/3pP1Q1/n1p2P2/2q1PB2/P1P3PP/R4RK1 b - -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=6; knight=0; pawn=7; total=32.\nBlack values: king=0; queen=9; rook=10; bishop=3; knight=3; pawn=8; total=33.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00549", "split": "perception", "task_type": "material_balance_trace", "fen": "r4b1N/pp2p1pq/n6p/k2B1b2/P2Q4/2P1P1B1/5PP1/2R2RK1 w - - 1 25", "prompt": "FEN: r4b1N/pp2p1pq/n6p/k2B1b2/P2Q4/2P1P1B1/5PP1/2R2RK1 w - - 1 25\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=d4; rook=c1,f1; bishop=g3,d5; knight=h8; pawn=f2,g2,c3,e3,a4 | black king=a5; queen=h7; rook=a8; bishop=f5,f8; knight=a6; pawn=h6,a7,b7,e7,g7\nCounts: white king=1; queen=1; rook=2; bishop=2; knight=1; pawn=5 | black king=1; queen=1; rook=1; bishop=2; knight=1; pawn=5\nValues: white total=33; black total=28\nBalance: White is up 5 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00550", "split": "perception", "task_type": "multi_state_tracking", "fen": "4r2k/2qnbb1p/2p2pp1/1pPp4/1P1P4/R1N2N1P/5PP1/Q4BK1 b - -", "prompt": "Starting FEN: 4r2k/2qnbb1p/2p2pp1/1pPp4/1P1P4/R1N2N1P/5PP1/Q4BK1 b - - 0 1\nAfter the moves c7e5 g1h1 g6g5, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 4r2k/3nbb1p/2p2p2/1pPpq1p1/1P1P4/R1N2N1P/5PP1/Q4B1K w - - 0 3", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "c7e5 g1h1 g6g5", "_multi_state_tracking_result": "4r2k/3nbb1p/2p2p2/1pPpq1p1/1P1P4/R1N2N1P/5PP1/Q4B1K w - - 0 3", "diagnostic": true, "hard_gate": false, "moves": "c7e5 g1h1 g6g5"}} {"example_id": "perception_00551", "split": "perception", "task_type": "board_print", "fen": "r4rk1/p5pp/1p6/3PpNQ1/4b3/P5P1/2q1nP1P/R3RK2 b - - 1 28", "prompt": "Position (FEN): r4rk1/p5pp/1p6/3PpNQ1/4b3/P5P1/2q1nP1P/R3RK2 b - - 1 28\nShow me the board.", "gold_answer": "8 r . . . . r k .\n7 p . . . . . p p\n6 . p . . . . . .\n5 . . . P p N Q .\n4 . . . . b . . .\n3 P . . . . . P .\n2 . . q . n P . P\n1 R . . . R K . .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00552", "split": "perception", "task_type": "board_to_fen", "fen": "r3qr1k/ppp3pp/4bn2/8/5B2/3Q3P/PPP3P1/RN3RK1 b - - 1 19", "prompt": "Here is the current board:\n8 r . . . q r . k\n7 p p p . . . p p\n6 . . . . b n . .\n5 . . . . . . . .\n4 . . . . . B . .\n3 . . . Q . . . P\n2 P P P . . . P .\n1 R N . . . R K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 19\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r3qr1k/ppp3pp/4bn2/8/5B2/3Q3P/PPP3P1/RN3RK1 b - - 1 19", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00553", "split": "perception", "task_type": "piece_id", "fen": "r3kb1r/pp1n1ppp/1n6/2pqP3/8/5N2/PP4PP/RNBQK2R w KQkq - 0 12", "prompt": "FEN: r3kb1r/pp1n1ppp/1n6/2pqP3/8/5N2/PP4PP/RNBQK2R w KQkq - 0 12\nWhat piece is on b6?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black knight", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "b6"}} {"example_id": "perception_00554", "split": "perception", "task_type": "material_count", "fen": "r2q1rk1/pp2ppbp/4bnp1/3n2B1/3P4/1BN2N2/PP3PPP/R2QR1K1 w - -", "prompt": "FEN: r2q1rk1/pp2ppbp/4bnp1/3n2B1/3P4/1BN2N2/PP3PPP/R2QR1K1 w - -\nWhat is the material count for both sides?", "gold_answer": "White (14 pieces): 2 bishops, 1 king, 2 knights, 6 pawns, 1 queen, 2 rooks. Black (14 pieces): 2 bishops, 1 king, 2 knights, 6 pawns, 1 queen, 2 rooks. Material is equal.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00555", "split": "perception", "task_type": "square_lookup", "fen": "r2nk2r/3qb1p1/4p3/p1ppPppn/1P6/P1PB1PP1/3N1B1P/R2QK2R w KQkq -", "prompt": "FEN: r2nk2r/3qb1p1/4p3/p1ppPppn/1P6/P1PB1PP1/3N1B1P/R2QK2R w KQkq -\nWhat is on h2?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "h2=white pawn", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "h2", "diagnostic": true, "hard_gate": false, "square": "h2"}} {"example_id": "perception_00556", "split": "perception", "task_type": "rank_lookup", "fen": "2r1k2r/pp1qnpp1/4p2p/3pP2P/1b1P1B2/5N2/PP2QPP1/R2R2K1 b k -", "prompt": "FEN: 2r1k2r/pp1qnpp1/4p2p/3pP2P/1b1P1B2/5N2/PP2QPP1/R2R2K1 b k -\nWhat is the compressed FEN row for rank 7?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 7: pp1qnpp1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "7", "_rank_lookup_row": "pp1qnpp1", "diagnostic": true, "hard_gate": false, "rank": "7", "fen_rank_row": "pp1qnpp1"}} {"example_id": "perception_00557", "split": "perception", "task_type": "square_coordinates", "fen": "5rk1/5ppp/4p3/3n2P1/8/1b6/6P1/5RK1 w - - 0 31", "prompt": "FEN: 5rk1/5ppp/4p3/3n2P1/8/1b6/6P1/5RK1 w - - 0 31\nFor square h7, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "h7: file=h; rank=7; fen_row_from_top=2; file_index=8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "h7", "diagnostic": true, "hard_gate": false, "square": "h7"}} {"example_id": "perception_00558", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r1bqkb1r/pp1p1ppp/2n1pn2/8/4P3/2P1Q3/PP1P1PPP/RNB1KBNR b KQkq -", "prompt": "FEN: r1bqkb1r/pp1p1ppp/2n1pn2/8/4P3/2P1Q3/PP1P1PPP/RNB1KBNR b KQkq -\nCompressed rank 1 row: RNB1KBNR\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 1: a=R; b=N; c=B; d=1; e=K; f=B; g=N; h=R", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "1", "_fen_rank_expansion_row": "RNB1KBNR", "diagnostic": true, "hard_gate": false, "rank": "1", "fen_rank_row": "RNB1KBNR"}} {"example_id": "perception_00559", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r1bq1r1k/4bp1p/2np2pN/p1p1p3/P3P3/2PP1QPP/B4P2/RN3RK1 b - - 4 19", "prompt": "Rank 4 row before: P3P3\nFile c changes from 1 to p. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 4: P3P3 -> P1p1P3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "c5c4", "_fen_rank_cell_edit_square": "c4", "_fen_rank_cell_edit_rank": "4", "_fen_rank_cell_edit_file": "c", "_fen_rank_cell_edit_before_row": "P3P3", "_fen_rank_cell_edit_after_row": "P1p1P3", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "p", "diagnostic": true, "hard_gate": false, "move": "c5c4", "square": "c4", "rank": "4", "file": "c", "before_row": "P3P3", "after_row": "P1p1P3", "before_fen": "1", "after_fen": "p"}} {"example_id": "perception_00560", "split": "perception", "task_type": "fen_board_edit", "fen": "r2q1rn1/1pp2p1k/1n1p2pp/pB1Pp1b1/P3P1P1/4B2P/1PPQNPK1/R4R2 w - -", "prompt": "Board FEN before: r2q1rn1/1pp2p1k/1n1p2pp/pB1Pp1b1/P3P1P1/4B2P/1PPQNPK1/R4R2\nApply square edits: f1 R->1; h1 1->R\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: r2q1rn1/1pp2p1k/1n1p2pp/pB1Pp1b1/P3P1P1/4B2P/1PPQNPK1/R6R", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "f1h1", "_fen_board_edit_board_fen_before": "r2q1rn1/1pp2p1k/1n1p2pp/pB1Pp1b1/P3P1P1/4B2P/1PPQNPK1/R4R2", "_fen_board_edit_board_fen_after": "r2q1rn1/1pp2p1k/1n1p2pp/pB1Pp1b1/P3P1P1/4B2P/1PPQNPK1/R6R", "_fen_board_edit_edit_text": "f1 R->1; h1 1->R", "_fen_board_edit_changed_squares": [{"square": "f1", "before": "white rook", "after": "empty", "before_fen": "R", "after_fen": "1"}, {"square": "h1", "before": "empty", "after": "white rook", "before_fen": "1", "after_fen": "R"}], "diagnostic": true, "hard_gate": false, "move": "f1h1", "board_fen_before": "r2q1rn1/1pp2p1k/1n1p2pp/pB1Pp1b1/P3P1P1/4B2P/1PPQNPK1/R4R2", "board_fen_after": "r2q1rn1/1pp2p1k/1n1p2pp/pB1Pp1b1/P3P1P1/4B2P/1PPQNPK1/R6R", "edit_text": "f1 R->1; h1 1->R", "changed_squares": [{"square": "f1", "before": "white rook", "after": "empty", "before_fen": "R", "after_fen": "1"}, {"square": "h1", "before": "empty", "after": "white rook", "before_fen": "1", "after_fen": "R"}]}} {"example_id": "perception_00561", "split": "perception", "task_type": "move_square_edits", "fen": "r3r1k1/p3qp1p/2p2p2/5b2/8/8/PPPQBPPP/R3K2R w KQ -", "prompt": "Starting FEN: r3r1k1/p3qp1p/2p2p2/5b2/8/8/PPPQBPPP/R3K2R w KQ -\nMove: d2d8\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: d2=white queen; d8=empty.\nSquares: d2 white queen->empty; d8 empty->white queen.\nRanks: rank 2 d Q->1; rank 8 d 1->Q.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "d2d8", "diagnostic": true, "hard_gate": false, "move": "d2d8"}} {"example_id": "perception_00562", "split": "perception", "task_type": "fen_assembly", "fen": "r1b2rk1/pp2ppbp/2np1np1/3N2B1/2P1P3/5P2/PP1qB1PP/R3K1NR w KQ -", "prompt": "Starting FEN: r1b2rk1/pp2ppbp/2np1np1/3N2B1/2P1P3/5P2/PP1qB1PP/R3K1NR w KQ - 0 1\nMove: e1f1\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white king e1f1.\nLookup: e1=white king; f1=empty.\nSquares: e1 white king->empty; f1 empty->white king.\nRanks: rank 1 e K->1; rank 1 f 1->K.\nResult FEN: r1b2rk1/pp2ppbp/2np1np1/3N2B1/2P1P3/5P2/PP1qB1PP/R4KNR b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "e1f1", "diagnostic": true, "hard_gate": false, "move": "e1f1"}} {"example_id": "perception_00563", "split": "perception", "task_type": "fen_row_application", "fen": "4r2k/p1p1nRbp/1q4p1/8/Q2PPB2/2PB4/Pr4PP/5RK1 w - - 2 26", "prompt": "Starting FEN: 4r2k/p1p1nRbp/1q4p1/8/Q2PPB2/2PB4/Pr4PP/5RK1 w - - 2 26\nMove: a4b5\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 2\nFullmove number: 26\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 4 Q2PPB2->3PPB2; rank 5 8->1Q6.\nResult FEN: 4r2k/p1p1nRbp/1q4p1/1Q6/3PPB2/2PB4/Pr4PP/5RK1 b - - 3 26", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "a4b5", "_fen_row_application_rank_rewrites": [{"rank": "4", "before": "Q2PPB2", "after": "3PPB2"}, {"rank": "5", "before": "8", "after": "1Q6"}], "diagnostic": true, "hard_gate": false, "move": "a4b5", "rank_rewrites": [{"rank": "4", "before": "Q2PPB2", "after": "3PPB2"}, {"rank": "5", "before": "8", "after": "1Q6"}]}} {"example_id": "perception_00564", "split": "perception", "task_type": "state_tracking", "fen": "k7/p1p2pbp/P7/6B1/1P1rr3/8/5PPP/R4RK1 w - -", "prompt": "Starting FEN: k7/p1p2pbp/P7/6B1/1P1rr3/8/5PPP/R4RK1 w - - 0 1\nAfter the moves g2g4, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: k7/p1p2pbp/P7/6B1/1P1rr1P1/8/5P1P/R4RK1 b - - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "g2g4", "_state_tracking_result": "k7/p1p2pbp/P7/6B1/1P1rr1P1/8/5P1P/R4RK1 b - - 0 1"}} {"example_id": "perception_00565", "split": "perception", "task_type": "material_inventory", "fen": "r3k3/pppnn2p/3bQ3/3P4/8/1P1N2P1/P6P/1KB2r2 w q - 5 27", "prompt": "FEN: r3k3/pppnn2p/3bQ3/3P4/8/1P1N2P1/P6P/1KB2r2 w q - 5 27\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=b1; queen=e6; rook=none; bishop=c1; knight=d3; pawn=a2,h2,b3,g3,d5.\nBlack inventory: king=e8; queen=none; rook=f1,a8; bishop=d6; knight=d7,e7; pawn=a7,b7,c7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00566", "split": "perception", "task_type": "material_piece_counts", "fen": "r1b1k2r/pp2ppbp/2n2np1/2p5/4PP2/2PB1N2/PP1N2PP/R1BK3R b kq -", "prompt": "FEN: r1b1k2r/pp2ppbp/2n2np1/2p5/4PP2/2PB1N2/PP1N2PP/R1BK3R b kq -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=2; bishop=2; knight=2; pawn=7.\nBlack counts: king=1; queen=0; rook=2; bishop=2; knight=2; pawn=7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00567", "split": "perception", "task_type": "material_value_totals", "fen": "3r1rk1/p4p1p/3P2p1/1p2p2n/3PP3/P1P2qP1/1B1Q1P1P/4R1K1 b - - 1 22", "prompt": "FEN: 3r1rk1/p4p1p/3P2p1/1p2p2n/3PP3/P1P2qP1/1B1Q1P1P/4R1K1 b - - 1 22\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=5; bishop=3; knight=0; pawn=8; total=25.\nBlack values: king=0; queen=9; rook=10; bishop=0; knight=3; pawn=6; total=28.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00568", "split": "perception", "task_type": "material_balance_trace", "fen": "r4rk1/pbp3pp/1b6/4N3/4p3/1P5P/1P3PP1/R1B2RK1 b - -", "prompt": "FEN: r4rk1/pbp3pp/1b6/4N3/4p3/1P5P/1P3PP1/R1B2RK1 b - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=none; rook=a1,f1; bishop=c1; knight=e5; pawn=b2,f2,g2,b3,h3 | black king=g8; queen=none; rook=a8,f8; bishop=b6,b7; knight=none; pawn=e4,a7,c7,g7,h7\nCounts: white king=1; queen=0; rook=2; bishop=1; knight=1; pawn=5 | black king=1; queen=0; rook=2; bishop=2; knight=0; pawn=5\nValues: white total=21; black total=21\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00569", "split": "perception", "task_type": "multi_state_tracking", "fen": "6Q1/8/3k4/3r4/5K2/8/8/8 w - -", "prompt": "Starting FEN: 6Q1/8/3k4/3r4/5K2/8/8/8 w - - 0 1\nAfter the moves g8g1 d5f5 f4g3, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 8/8/3k4/5r2/8/6K1/8/6Q1 b - - 3 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "g8g1 d5f5 f4g3", "_multi_state_tracking_result": "8/8/3k4/5r2/8/6K1/8/6Q1 b - - 3 2", "diagnostic": true, "hard_gate": false, "moves": "g8g1 d5f5 f4g3"}} {"example_id": "perception_00570", "split": "perception", "task_type": "board_print", "fen": "r1bq1rk1/ppp1b1pp/4p3/4n3/3P4/2P2N2/PP1N2PP/R1Q2RK1 w - - 0 15", "prompt": "Position (FEN): r1bq1rk1/ppp1b1pp/4p3/4n3/3P4/2P2N2/PP1N2PP/R1Q2RK1 w - - 0 15\nShow me the board.", "gold_answer": "8 r . b q . r k .\n7 p p p . b . p p\n6 . . . . p . . .\n5 . . . . n . . .\n4 . . . P . . . .\n3 . . P . . N . .\n2 P P . N . . P P\n1 R . Q . . R K .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00571", "split": "perception", "task_type": "board_to_fen", "fen": "rnbqkb1r/1p3p2/p2p1npp/4pN2/4P3/2N1BQ2/PPP2PPP/R3KB1R w KQkq -", "prompt": "Here is the current board:\n8 r n b q k b . r\n7 . p . . . p . .\n6 p . . p . n p p\n5 . . . . p N . .\n4 . . . . P . . .\n3 . . N . B Q . .\n2 P P P . . P P P\n1 R . . . K B . R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "rnbqkb1r/1p3p2/p2p1npp/4pN2/4P3/2N1BQ2/PPP2PPP/R3KB1R w KQkq - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00572", "split": "perception", "task_type": "piece_id", "fen": "r1b1kb1r/2q2ppp/p1p1p3/3pP3/6Q1/8/PPP2PPP/RNB1R1K1 b kq -", "prompt": "FEN: r1b1kb1r/2q2ppp/p1p1p3/3pP3/6Q1/8/PPP2PPP/RNB1R1K1 b kq -\nWhat piece is on c2?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "c2"}} {"example_id": "perception_00573", "split": "perception", "task_type": "material_count", "fen": "7k/8/4K2P/6P1/6Q1/8/8/8 w - - 1 60", "prompt": "FEN: 7k/8/4K2P/6P1/6Q1/8/8/8 w - - 1 60\nWhat is the material count for both sides?", "gold_answer": "White (4 pieces): 1 king, 2 pawns, 1 queen. Black (1 pieces): 1 king. White is up 11 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00574", "split": "perception", "task_type": "square_lookup", "fen": "rnb1k2r/ppp2pp1/1b5p/4P3/2B1n3/4BN2/PP3PPP/RN1R2K1 b kq - 2 11", "prompt": "FEN: rnb1k2r/ppp2pp1/1b5p/4P3/2B1n3/4BN2/PP3PPP/RN1R2K1 b kq - 2 11\nWhat is on h6?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "h6=black pawn", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "h6", "diagnostic": true, "hard_gate": false, "square": "h6"}} {"example_id": "perception_00575", "split": "perception", "task_type": "rank_lookup", "fen": "r4rk1/1p3ppp/p2qb3/3p4/3P2n1/2NB2R1/PP3PPP/R2Q2K1 b - - 4 15", "prompt": "FEN: r4rk1/1p3ppp/p2qb3/3p4/3P2n1/2NB2R1/PP3PPP/R2Q2K1 b - - 4 15\nWhat is the compressed FEN row for rank 1?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 1: R2Q2K1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "1", "_rank_lookup_row": "R2Q2K1", "diagnostic": true, "hard_gate": false, "rank": "1", "fen_rank_row": "R2Q2K1"}} {"example_id": "perception_00576", "split": "perception", "task_type": "square_coordinates", "fen": "4r1k1/1b1q1pp1/p2p3p/2pP4/5Q2/1P3N1P/P4PP1/3R2K1 b - - 1 27", "prompt": "FEN: 4r1k1/1b1q1pp1/p2p3p/2pP4/5Q2/1P3N1P/P4PP1/3R2K1 b - - 1 27\nFor square d6, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "d6: file=d; rank=6; fen_row_from_top=3; file_index=4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "d6", "diagnostic": true, "hard_gate": false, "square": "d6"}} {"example_id": "perception_00577", "split": "perception", "task_type": "fen_rank_expansion", "fen": "6k1/1q1nbppp/1p1np3/1P1p4/3P3P/1P1QP1P1/1B3PBK/8 b - - 7 28", "prompt": "FEN: 6k1/1q1nbppp/1p1np3/1P1p4/3P3P/1P1QP1P1/1B3PBK/8 b - - 7 28\nCompressed rank 3 row: 1P1QP1P1\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 3: a=1; b=P; c=1; d=Q; e=P; f=1; g=P; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "3", "_fen_rank_expansion_row": "1P1QP1P1", "diagnostic": true, "hard_gate": false, "rank": "3", "fen_rank_row": "1P1QP1P1"}} {"example_id": "perception_00578", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "rnb1kbnr/1p3ppp/2p5/1B6/8/1N6/PPP2PPP/R1B1K2R w KQkq - 0 12", "prompt": "Rank 2 row before: PPP2PPP\nFile h changes from P to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 2: PPP2PPP -> PPP2PP1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "h2h4", "_fen_rank_cell_edit_square": "h2", "_fen_rank_cell_edit_rank": "2", "_fen_rank_cell_edit_file": "h", "_fen_rank_cell_edit_before_row": "PPP2PPP", "_fen_rank_cell_edit_after_row": "PPP2PP1", "_fen_rank_cell_edit_before_fen": "P", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "h2h4", "square": "h2", "rank": "2", "file": "h", "before_row": "PPP2PPP", "after_row": "PPP2PP1", "before_fen": "P", "after_fen": "1"}} {"example_id": "perception_00579", "split": "perception", "task_type": "fen_board_edit", "fen": "r2qr1k1/pp1n1pbp/3p1np1/2pP2B1/2P3b1/2N2N2/PP1QBPPP/R4RK1 w - -", "prompt": "Board FEN before: r2qr1k1/pp1n1pbp/3p1np1/2pP2B1/2P3b1/2N2N2/PP1QBPPP/R4RK1\nApply square edits: a2 P->1; a4 1->P\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: r2qr1k1/pp1n1pbp/3p1np1/2pP2B1/P1P3b1/2N2N2/1P1QBPPP/R4RK1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "a2a4", "_fen_board_edit_board_fen_before": "r2qr1k1/pp1n1pbp/3p1np1/2pP2B1/2P3b1/2N2N2/PP1QBPPP/R4RK1", "_fen_board_edit_board_fen_after": "r2qr1k1/pp1n1pbp/3p1np1/2pP2B1/P1P3b1/2N2N2/1P1QBPPP/R4RK1", "_fen_board_edit_edit_text": "a2 P->1; a4 1->P", "_fen_board_edit_changed_squares": [{"square": "a2", "before": "white pawn", "after": "empty", "before_fen": "P", "after_fen": "1"}, {"square": "a4", "before": "empty", "after": "white pawn", "before_fen": "1", "after_fen": "P"}], "diagnostic": true, "hard_gate": false, "move": "a2a4", "board_fen_before": "r2qr1k1/pp1n1pbp/3p1np1/2pP2B1/2P3b1/2N2N2/PP1QBPPP/R4RK1", "board_fen_after": "r2qr1k1/pp1n1pbp/3p1np1/2pP2B1/P1P3b1/2N2N2/1P1QBPPP/R4RK1", "edit_text": "a2 P->1; a4 1->P", "changed_squares": [{"square": "a2", "before": "white pawn", "after": "empty", "before_fen": "P", "after_fen": "1"}, {"square": "a4", "before": "empty", "after": "white pawn", "before_fen": "1", "after_fen": "P"}]}} {"example_id": "perception_00580", "split": "perception", "task_type": "move_square_edits", "fen": "rnbqkb1r/ppp2ppp/4pn2/3P4/2p1P3/2N2N2/PP3PPP/R1BQKB1R w KQkq -", "prompt": "Starting FEN: rnbqkb1r/ppp2ppp/4pn2/3P4/2p1P3/2N2N2/PP3PPP/R1BQKB1R w KQkq -\nMove: b2b3\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: b2=white pawn; b3=empty.\nSquares: b2 white pawn->empty; b3 empty->white pawn.\nRanks: rank 2 b P->1; rank 3 b 1->P.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "b2b3", "diagnostic": true, "hard_gate": false, "move": "b2b3"}} {"example_id": "perception_00581", "split": "perception", "task_type": "fen_assembly", "fen": "r2q1rk1/ppp2ppp/2np1n2/4p3/1bB1PPb1/2NP1N2/PPP3PP/R1BQ1RK1 w - -", "prompt": "Starting FEN: r2q1rk1/ppp2ppp/2np1n2/4p3/1bB1PPb1/2NP1N2/PPP3PP/R1BQ1RK1 w - - 0 1\nMove: c4e6\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white bishop c4e6.\nLookup: c4=white bishop; e6=empty.\nSquares: c4 white bishop->empty; e6 empty->white bishop.\nRanks: rank 4 c B->1; rank 6 e 1->B.\nResult FEN: r2q1rk1/ppp2ppp/2npBn2/4p3/1b2PPb1/2NP1N2/PPP3PP/R1BQ1RK1 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "c4e6", "diagnostic": true, "hard_gate": false, "move": "c4e6"}} {"example_id": "perception_00582", "split": "perception", "task_type": "fen_row_application", "fen": "8/1pp1k3/p6p/b7/8/1K5P/5rP1/8 w - - 0 43", "prompt": "Starting FEN: 8/1pp1k3/p6p/b7/8/1K5P/5rP1/8 w - - 0 43\nMove: h3h4\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 43\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 3 1K5P->1K6; rank 4 8->7P.\nResult FEN: 8/1pp1k3/p6p/b7/7P/1K6/5rP1/8 b - - 0 43", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "h3h4", "_fen_row_application_rank_rewrites": [{"rank": "3", "before": "1K5P", "after": "1K6"}, {"rank": "4", "before": "8", "after": "7P"}], "diagnostic": true, "hard_gate": false, "move": "h3h4", "rank_rewrites": [{"rank": "3", "before": "1K5P", "after": "1K6"}, {"rank": "4", "before": "8", "after": "7P"}]}} {"example_id": "perception_00583", "split": "perception", "task_type": "state_tracking", "fen": "r1bqk2r/2ppbppp/p1n2n2/1p2p1B1/4P3/P1PP1Q2/BP3PPP/RN2K1NR w KQkq - 2 9", "prompt": "Starting FEN: r1bqk2r/2ppbppp/p1n2n2/1p2p1B1/4P3/P1PP1Q2/BP3PPP/RN2K1NR w KQkq - 2 9\nAfter the moves g5d2, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 2\nFullmove number: 9\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r1bqk2r/2ppbppp/p1n2n2/1p2p3/4P3/P1PP1Q2/BP1B1PPP/RN2K1NR b KQkq - 3 9", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "g5d2", "_state_tracking_result": "r1bqk2r/2ppbppp/p1n2n2/1p2p3/4P3/P1PP1Q2/BP1B1PPP/RN2K1NR b KQkq - 3 9"}} {"example_id": "perception_00584", "split": "perception", "task_type": "material_inventory", "fen": "4kr2/1p5Q/p2p2R1/2p2qp1/3p4/P2P1P2/1PP3PP/6K1 w - - 5 37", "prompt": "FEN: 4kr2/1p5Q/p2p2R1/2p2qp1/3p4/P2P1P2/1PP3PP/6K1 w - - 5 37\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=h7; rook=g6; bishop=none; knight=none; pawn=b2,c2,g2,h2,a3,d3,f3.\nBlack inventory: king=e8; queen=f5; rook=f8; bishop=none; knight=none; pawn=d4,c5,g5,a6,d6,b7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00585", "split": "perception", "task_type": "material_piece_counts", "fen": "rnb4r/1p1k1ppp/8/pq1p1N2/3p2P1/4PP2/3B1K1P/7R b - - 1 22", "prompt": "FEN: rnb4r/1p1k1ppp/8/pq1p1N2/3p2P1/4PP2/3B1K1P/7R b - - 1 22\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=1; bishop=1; knight=1; pawn=4.\nBlack counts: king=1; queen=1; rook=2; bishop=1; knight=1; pawn=7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00586", "split": "perception", "task_type": "material_value_totals", "fen": "r4rk1/pp1qnppp/2n1p3/1B6/1B1P4/8/P4PPP/1R1Q1RK1 w - -", "prompt": "FEN: r4rk1/pp1qnppp/2n1p3/1B6/1B1P4/8/P4PPP/1R1Q1RK1 w - -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=6; knight=0; pawn=5; total=30.\nBlack values: king=0; queen=9; rook=10; bishop=0; knight=6; pawn=6; total=31.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00587", "split": "perception", "task_type": "material_balance_trace", "fen": "2q3k1/4Q3/r4p2/3bpN2/3p2p1/3P2P1/8/1R4K1 b - -", "prompt": "FEN: 2q3k1/4Q3/r4p2/3bpN2/3p2p1/3P2P1/8/1R4K1 b - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=e7; rook=b1; bishop=none; knight=f5; pawn=d3,g3 | black king=g8; queen=c8; rook=a6; bishop=d5; knight=none; pawn=d4,g4,e5,f6\nCounts: white king=1; queen=1; rook=1; bishop=0; knight=1; pawn=2 | black king=1; queen=1; rook=1; bishop=1; knight=0; pawn=4\nValues: white total=19; black total=21\nBalance: Black is up 2 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00588", "split": "perception", "task_type": "multi_state_tracking", "fen": "4k3/p1p3p1/1p3p2/2r4p/3n1N1P/2N2P2/PP4P1/7K w - - 2 29", "prompt": "Starting FEN: 4k3/p1p3p1/1p3p2/2r4p/3n1N1P/2N2P2/PP4P1/7K w - - 2 29\nAfter the moves f4h3 g7g5 f3f4, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 2\nFullmove number: 29\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 4k3/p1p5/1p3p2/2r3pp/3n1P1P/2N4N/PP4P1/7K b - - 0 30", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "f4h3 g7g5 f3f4", "_multi_state_tracking_result": "4k3/p1p5/1p3p2/2r3pp/3n1P1P/2N4N/PP4P1/7K b - - 0 30", "diagnostic": true, "hard_gate": false, "moves": "f4h3 g7g5 f3f4"}} {"example_id": "perception_00589", "split": "perception", "task_type": "board_print", "fen": "2kr1b2/pppq4/2b1pP2/3pPn1p/2PP4/N4N2/PP5P/R1B3QK b - - 0 19", "prompt": "Position (FEN): 2kr1b2/pppq4/2b1pP2/3pPn1p/2PP4/N4N2/PP5P/R1B3QK b - - 0 19\nShow me the board.", "gold_answer": "8 . . k r . b . .\n7 p p p q . . . .\n6 . . b . p P . .\n5 . . . p P n . p\n4 . . P P . . . .\n3 N . . . . N . .\n2 P P . . . . . P\n1 R . B . . . Q K\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00590", "split": "perception", "task_type": "board_to_fen", "fen": "2r4r/pp2kp2/3p1n1p/6pP/4Pp2/5P2/PPP5/2KR3R w - -", "prompt": "Here is the current board:\n8 . . r . . . . r\n7 p p . . k p . .\n6 . . . p . n . p\n5 . . . . . . p P\n4 . . . . P p . .\n3 . . . . . P . .\n2 P P P . . . . .\n1 . . K R . . . R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "2r4r/pp2kp2/3p1n1p/6pP/4Pp2/5P2/PPP5/2KR3R w - - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00591", "split": "perception", "task_type": "piece_id", "fen": "r3k2r/pppb1ppp/8/8/4Q3/4B3/P2NKPPP/7q b kq - 1 16", "prompt": "FEN: r3k2r/pppb1ppp/8/8/4Q3/4B3/P2NKPPP/7q b kq - 1 16\nWhat piece is on g2?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "g2"}} {"example_id": "perception_00592", "split": "perception", "task_type": "material_count", "fen": "4r3/p2n1kp1/1p1R3p/1b6/1B2n3/P7/1P3PPP/2R3K1 w - - 8 25", "prompt": "FEN: 4r3/p2n1kp1/1p1R3p/1b6/1B2n3/P7/1P3PPP/2R3K1 w - - 8 25\nWhat is the material count for both sides?", "gold_answer": "White (9 pieces): 1 bishop, 1 king, 5 pawns, 2 rooks. Black (9 pieces): 1 bishop, 1 king, 2 knights, 4 pawns, 1 rook. Material is equal.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00593", "split": "perception", "task_type": "square_lookup", "fen": "rn1qk2r/pppbbppp/6n1/3P4/7P/2N5/PP2QPP1/R1B1KBNR b KQkq -", "prompt": "FEN: rn1qk2r/pppbbppp/6n1/3P4/7P/2N5/PP2QPP1/R1B1KBNR b KQkq -\nWhat is on h4?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "h4=white pawn", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "h4", "diagnostic": true, "hard_gate": false, "square": "h4"}} {"example_id": "perception_00594", "split": "perception", "task_type": "rank_lookup", "fen": "rnbqk1nr/pp3Bpp/2pp4/4p3/4P3/2P2N2/PPP2PPP/R1BQK2R b KQkq -", "prompt": "FEN: rnbqk1nr/pp3Bpp/2pp4/4p3/4P3/2P2N2/PPP2PPP/R1BQK2R b KQkq -\nWhat is the compressed FEN row for rank 6?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 6: 2pp4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "6", "_rank_lookup_row": "2pp4", "diagnostic": true, "hard_gate": false, "rank": "6", "fen_rank_row": "2pp4"}} {"example_id": "perception_00595", "split": "perception", "task_type": "square_coordinates", "fen": "3r2k1/5ppp/8/8/8/5QP1/5P1P/2q3K1 w - -", "prompt": "FEN: 3r2k1/5ppp/8/8/8/5QP1/5P1P/2q3K1 w - -\nFor square g3, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "g3: file=g; rank=3; fen_row_from_top=6; file_index=7", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "g3", "diagnostic": true, "hard_gate": false, "square": "g3"}} {"example_id": "perception_00596", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r3kb1r/ppp1qppp/2n1bn2/8/2BP4/5N2/PP3PPP/RNBQR1K1 b kq -", "prompt": "FEN: r3kb1r/ppp1qppp/2n1bn2/8/2BP4/5N2/PP3PPP/RNBQR1K1 b kq -\nCompressed rank 6 row: 2n1bn2\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 6: a=1; b=1; c=n; d=1; e=b; f=n; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "6", "_fen_rank_expansion_row": "2n1bn2", "diagnostic": true, "hard_gate": false, "rank": "6", "fen_rank_row": "2n1bn2"}} {"example_id": "perception_00597", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "2r1n1k1/8/1p4PP/p5K1/8/8/2q5/8 b - - 2 47", "prompt": "Rank 3 row before: 8\nFile b changes from 1 to q. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 3: 8 -> 1q6", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "c2b3", "_fen_rank_cell_edit_square": "b3", "_fen_rank_cell_edit_rank": "3", "_fen_rank_cell_edit_file": "b", "_fen_rank_cell_edit_before_row": "8", "_fen_rank_cell_edit_after_row": "1q6", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "q", "diagnostic": true, "hard_gate": false, "move": "c2b3", "square": "b3", "rank": "3", "file": "b", "before_row": "8", "after_row": "1q6", "before_fen": "1", "after_fen": "q"}} {"example_id": "perception_00598", "split": "perception", "task_type": "fen_board_edit", "fen": "r6k/pp2N1p1/3p3p/4p3/4P3/3P4/PPPq2rP/1K3R1R w - - 4 22", "prompt": "Board FEN before: r6k/pp2N1p1/3p3p/4p3/4P3/3P4/PPPq2rP/1K3R1R\nApply square edits: h2 P->1; h4 1->P\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: r6k/pp2N1p1/3p3p/4p3/4P2P/3P4/PPPq2r1/1K3R1R", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "h2h4", "_fen_board_edit_board_fen_before": "r6k/pp2N1p1/3p3p/4p3/4P3/3P4/PPPq2rP/1K3R1R", "_fen_board_edit_board_fen_after": "r6k/pp2N1p1/3p3p/4p3/4P2P/3P4/PPPq2r1/1K3R1R", "_fen_board_edit_edit_text": "h2 P->1; h4 1->P", "_fen_board_edit_changed_squares": [{"square": "h2", "before": "white pawn", "after": "empty", "before_fen": "P", "after_fen": "1"}, {"square": "h4", "before": "empty", "after": "white pawn", "before_fen": "1", "after_fen": "P"}], "diagnostic": true, "hard_gate": false, "move": "h2h4", "board_fen_before": "r6k/pp2N1p1/3p3p/4p3/4P3/3P4/PPPq2rP/1K3R1R", "board_fen_after": "r6k/pp2N1p1/3p3p/4p3/4P2P/3P4/PPPq2r1/1K3R1R", "edit_text": "h2 P->1; h4 1->P", "changed_squares": [{"square": "h2", "before": "white pawn", "after": "empty", "before_fen": "P", "after_fen": "1"}, {"square": "h4", "before": "empty", "after": "white pawn", "before_fen": "1", "after_fen": "P"}]}} {"example_id": "perception_00599", "split": "perception", "task_type": "move_square_edits", "fen": "7k/Bb4bp/4Bpp1/4p3/P3P3/8/1r5r/R3RK2 b - - 0 26", "prompt": "Starting FEN: 7k/Bb4bp/4Bpp1/4p3/P3P3/8/1r5r/R3RK2 b - - 0 26\nMove: b2c2\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: b2=black rook; c2=empty.\nSquares: b2 black rook->empty; c2 empty->black rook.\nRanks: rank 2 b r->1; rank 2 c 1->r.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "b2c2", "diagnostic": true, "hard_gate": false, "move": "b2c2"}} {"example_id": "perception_00600", "split": "perception", "task_type": "fen_assembly", "fen": "4k3/1RQ5/P6p/8/4Ppp1/5N1P/2P2PP1/6K1 w - - 0 41", "prompt": "Starting FEN: 4k3/1RQ5/P6p/8/4Ppp1/5N1P/2P2PP1/6K1 w - - 0 41\nMove: c7c3\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 41\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white queen c7c3.\nLookup: c7=white queen; c3=empty.\nSquares: c7 white queen->empty; c3 empty->white queen.\nRanks: rank 7 c Q->1; rank 3 c 1->Q.\nResult FEN: 4k3/1R6/P6p/8/4Ppp1/2Q2N1P/2P2PP1/6K1 b - - 1 41", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "c7c3", "diagnostic": true, "hard_gate": false, "move": "c7c3"}} {"example_id": "perception_00601", "split": "perception", "task_type": "fen_row_application", "fen": "r2qk1nr/1pp2ppp/p1p5/4b3/4PB2/2N2Q2/PPP2PPP/R3K2R b KQkq -", "prompt": "Starting FEN: r2qk1nr/1pp2ppp/p1p5/4b3/4PB2/2N2Q2/PPP2PPP/R3K2R b KQkq - 0 1\nMove: e8d7\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 8 r2qk1nr->r2q2nr; rank 7 1pp2ppp->1ppk1ppp.\nResult FEN: r2q2nr/1ppk1ppp/p1p5/4b3/4PB2/2N2Q2/PPP2PPP/R3K2R w KQ - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "e8d7", "_fen_row_application_rank_rewrites": [{"rank": "8", "before": "r2qk1nr", "after": "r2q2nr"}, {"rank": "7", "before": "1pp2ppp", "after": "1ppk1ppp"}], "diagnostic": true, "hard_gate": false, "move": "e8d7", "rank_rewrites": [{"rank": "8", "before": "r2qk1nr", "after": "r2q2nr"}, {"rank": "7", "before": "1pp2ppp", "after": "1ppk1ppp"}]}} {"example_id": "perception_00602", "split": "perception", "task_type": "state_tracking", "fen": "4rrk1/ppp3pp/3p4/5pq1/4P3/2NB1P2/PP3K2/5R2 b - - 1 23", "prompt": "Starting FEN: 4rrk1/ppp3pp/3p4/5pq1/4P3/2NB1P2/PP3K2/5R2 b - - 1 23\nAfter the moves g8f7, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 23\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 4rr2/ppp2kpp/3p4/5pq1/4P3/2NB1P2/PP3K2/5R2 w - - 2 24", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "g8f7", "_state_tracking_result": "4rr2/ppp2kpp/3p4/5pq1/4P3/2NB1P2/PP3K2/5R2 w - - 2 24"}} {"example_id": "perception_00603", "split": "perception", "task_type": "material_inventory", "fen": "2r2rk1/3q1pb1/p2p2pp/1ppP4/5P1B/P1P4P/1PQ3P1/R4RK1 b - - 1 21", "prompt": "FEN: 2r2rk1/3q1pb1/p2p2pp/1ppP4/5P1B/P1P4P/1PQ3P1/R4RK1 b - - 1 21\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=c2; rook=a1,f1; bishop=h4; knight=none; pawn=b2,g2,a3,c3,h3,f4,d5.\nBlack inventory: king=g8; queen=d7; rook=c8,f8; bishop=g7; knight=none; pawn=b5,c5,a6,d6,g6,h6,f7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00604", "split": "perception", "task_type": "material_piece_counts", "fen": "2kr1b1r/ppq2ppp/2b2n2/4P3/2B5/2P3Q1/PP3PPP/RNB1K2R b KQ -", "prompt": "FEN: 2kr1b1r/ppq2ppp/2b2n2/4P3/2B5/2P3Q1/PP3PPP/RNB1K2R b KQ -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=2; knight=1; pawn=7.\nBlack counts: king=1; queen=1; rook=2; bishop=2; knight=1; pawn=5.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00605", "split": "perception", "task_type": "material_value_totals", "fen": "8/8/2K5/p1p3kP/PbP5/1P6/4B3/8 b - - 2 67", "prompt": "FEN: 8/8/2K5/p1p3kP/PbP5/1P6/4B3/8 b - - 2 67\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=0; bishop=3; knight=0; pawn=4; total=7.\nBlack values: king=0; queen=0; rook=0; bishop=3; knight=0; pawn=2; total=5.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00606", "split": "perception", "task_type": "material_balance_trace", "fen": "8/5k2/N1b1p1p1/1p6/2nP2PP/P7/5K2/2B5 w - - 3 43", "prompt": "FEN: 8/5k2/N1b1p1p1/1p6/2nP2PP/P7/5K2/2B5 w - - 3 43\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=f2; queen=none; rook=none; bishop=c1; knight=a6; pawn=a3,d4,g4,h4 | black king=f7; queen=none; rook=none; bishop=c6; knight=c4; pawn=b5,e6,g6\nCounts: white king=1; queen=0; rook=0; bishop=1; knight=1; pawn=4 | black king=1; queen=0; rook=0; bishop=1; knight=1; pawn=3\nValues: white total=10; black total=9\nBalance: White is up 1 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00607", "split": "perception", "task_type": "multi_state_tracking", "fen": "8/p3r2p/1k6/2n1P3/2p5/R7/P1P4P/3R2K1 w - - 3 35", "prompt": "Starting FEN: 8/p3r2p/1k6/2n1P3/2p5/R7/P1P4P/3R2K1 w - - 3 35\nAfter the moves h2h4 b6b5, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 3\nFullmove number: 35\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 8/p3r2p/8/1kn1P3/2p4P/R7/P1P5/3R2K1 w - - 1 36", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "h2h4 b6b5", "_multi_state_tracking_result": "8/p3r2p/8/1kn1P3/2p4P/R7/P1P5/3R2K1 w - - 1 36", "diagnostic": true, "hard_gate": false, "moves": "h2h4 b6b5"}} {"example_id": "perception_00608", "split": "perception", "task_type": "board_print", "fen": "r3r3/p2b1kpp/2p5/3p4/n6P/5PP1/PP1N1KB1/R3R3 w - -", "prompt": "Position (FEN): r3r3/p2b1kpp/2p5/3p4/n6P/5PP1/PP1N1KB1/R3R3 w - -\nShow me the board.", "gold_answer": "8 r . . . r . . .\n7 p . . b . k p p\n6 . . p . . . . .\n5 . . . p . . . .\n4 n . . . . . . P\n3 . . . . . P P .\n2 P P . N . K B .\n1 R . . . R . . .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00609", "split": "perception", "task_type": "board_to_fen", "fen": "rb3rk1/1b1n1ppp/p1p2q2/1p1p4/5N2/1P2PB1N/P1P2PPP/1R1Q1RK1 w - - 4 19", "prompt": "Here is the current board:\n8 r b . . . r k .\n7 . b . n . p p p\n6 p . p . . q . .\n5 . p . p . . . .\n4 . . . . . N . .\n3 . P . . P B . N\n2 P . P . . P P P\n1 . R . Q . R K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 4\nFullmove number: 19\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "rb3rk1/1b1n1ppp/p1p2q2/1p1p4/5N2/1P2PB1N/P1P2PPP/1R1Q1RK1 w - - 4 19", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00610", "split": "perception", "task_type": "piece_id", "fen": "8/3P1k2/8/8/B5R1/6P1/5B2/6K1 b - - 0 52", "prompt": "FEN: 8/3P1k2/8/8/B5R1/6P1/5B2/6K1 b - - 0 52\nWhat piece is on f2?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white bishop", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "f2"}} {"example_id": "perception_00611", "split": "perception", "task_type": "material_count", "fen": "rnbqk2r/ppp2ppp/8/8/8/2N2N2/PPPPPK2/R1BQ1B2 b kq -", "prompt": "FEN: rnbqk2r/ppp2ppp/8/8/8/2N2N2/PPPPPK2/R1BQ1B2 b kq -\nWhat is the material count for both sides?", "gold_answer": "White (12 pieces): 2 bishops, 1 king, 2 knights, 5 pawns, 1 queen, 1 rook. Black (12 pieces): 1 bishop, 1 king, 1 knight, 6 pawns, 1 queen, 2 rooks. Material is equal.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00612", "split": "perception", "task_type": "square_lookup", "fen": "r1bqk2r/pp1pnppp/1bn5/4p3/3PP3/B1P2N2/P4PPP/RN1QKB1R b KQkq -", "prompt": "FEN: r1bqk2r/pp1pnppp/1bn5/4p3/3PP3/B1P2N2/P4PPP/RN1QKB1R b KQkq -\nWhat is on b2?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "b2=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "b2", "diagnostic": true, "hard_gate": false, "square": "b2"}} {"example_id": "perception_00613", "split": "perception", "task_type": "rank_lookup", "fen": "1rbq1rk1/4nppp/p2p4/1p1Np1b1/4P3/2P5/PPN1BPPP/R2Q1RK1 w - -", "prompt": "FEN: 1rbq1rk1/4nppp/p2p4/1p1Np1b1/4P3/2P5/PPN1BPPP/R2Q1RK1 w - -\nWhat is the compressed FEN row for rank 1?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 1: R2Q1RK1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "1", "_rank_lookup_row": "R2Q1RK1", "diagnostic": true, "hard_gate": false, "rank": "1", "fen_rank_row": "R2Q1RK1"}} {"example_id": "perception_00614", "split": "perception", "task_type": "square_coordinates", "fen": "8/1p2R3/2k3p1/2P1n1p1/8/2K5/8/8 b - - 0 47", "prompt": "FEN: 8/1p2R3/2k3p1/2P1n1p1/8/2K5/8/8 b - - 0 47\nFor square e2, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "e2: file=e; rank=2; fen_row_from_top=7; file_index=5", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "e2", "diagnostic": true, "hard_gate": false, "square": "e2"}} {"example_id": "perception_00615", "split": "perception", "task_type": "fen_rank_expansion", "fen": "N7/8/8/2N5/2N1N3/8/5Q1K/k7 b - -", "prompt": "FEN: N7/8/8/2N5/2N1N3/8/5Q1K/k7 b - -\nCompressed rank 1 row: k7\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 1: a=k; b=1; c=1; d=1; e=1; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "1", "_fen_rank_expansion_row": "k7", "diagnostic": true, "hard_gate": false, "rank": "1", "fen_rank_row": "k7"}} {"example_id": "perception_00616", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "2k3r1/1bp5/8/1p4pp/pP1pP3/P2PR3/5PPP/3R2K1 w - - 0 33", "prompt": "Rank 2 row before: 5PPP\nFile f changes from P to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 2: 5PPP -> 6PP", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "f2f4", "_fen_rank_cell_edit_square": "f2", "_fen_rank_cell_edit_rank": "2", "_fen_rank_cell_edit_file": "f", "_fen_rank_cell_edit_before_row": "5PPP", "_fen_rank_cell_edit_after_row": "6PP", "_fen_rank_cell_edit_before_fen": "P", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "f2f4", "square": "f2", "rank": "2", "file": "f", "before_row": "5PPP", "after_row": "6PP", "before_fen": "P", "after_fen": "1"}} {"example_id": "perception_00617", "split": "perception", "task_type": "fen_board_edit", "fen": "rn5r/1ppbkppp/p2p1n1q/3Pp3/4P1P1/2N2N1P/PPP1QP2/1K1R1B1R b - - 0 15", "prompt": "Board FEN before: rn5r/1ppbkppp/p2p1n1q/3Pp3/4P1P1/2N2N1P/PPP1QP2/1K1R1B1R\nApply square edits: d7 b->1; b5 1->b\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: rn5r/1pp1kppp/p2p1n1q/1b1Pp3/4P1P1/2N2N1P/PPP1QP2/1K1R1B1R", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "d7b5", "_fen_board_edit_board_fen_before": "rn5r/1ppbkppp/p2p1n1q/3Pp3/4P1P1/2N2N1P/PPP1QP2/1K1R1B1R", "_fen_board_edit_board_fen_after": "rn5r/1pp1kppp/p2p1n1q/1b1Pp3/4P1P1/2N2N1P/PPP1QP2/1K1R1B1R", "_fen_board_edit_edit_text": "d7 b->1; b5 1->b", "_fen_board_edit_changed_squares": [{"square": "d7", "before": "black bishop", "after": "empty", "before_fen": "b", "after_fen": "1"}, {"square": "b5", "before": "empty", "after": "black bishop", "before_fen": "1", "after_fen": "b"}], "diagnostic": true, "hard_gate": false, "move": "d7b5", "board_fen_before": "rn5r/1ppbkppp/p2p1n1q/3Pp3/4P1P1/2N2N1P/PPP1QP2/1K1R1B1R", "board_fen_after": "rn5r/1pp1kppp/p2p1n1q/1b1Pp3/4P1P1/2N2N1P/PPP1QP2/1K1R1B1R", "edit_text": "d7 b->1; b5 1->b", "changed_squares": [{"square": "d7", "before": "black bishop", "after": "empty", "before_fen": "b", "after_fen": "1"}, {"square": "b5", "before": "empty", "after": "black bishop", "before_fen": "1", "after_fen": "b"}]}} {"example_id": "perception_00618", "split": "perception", "task_type": "move_square_edits", "fen": "rn1q1rk1/2p2ppp/pp1bp3/8/1PBPb3/P3PN2/1B3PPP/R2Q1RK1 w - - 0 12", "prompt": "Starting FEN: rn1q1rk1/2p2ppp/pp1bp3/8/1PBPb3/P3PN2/1B3PPP/R2Q1RK1 w - - 0 12\nMove: f3g5\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: f3=white knight; g5=empty.\nSquares: f3 white knight->empty; g5 empty->white knight.\nRanks: rank 3 f N->1; rank 5 g 1->N.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "f3g5", "diagnostic": true, "hard_gate": false, "move": "f3g5"}} {"example_id": "perception_00619", "split": "perception", "task_type": "fen_assembly", "fen": "8/8/8/4nRk1/6P1/6KP/8/8 b - - 16 57", "prompt": "Starting FEN: 8/8/8/4nRk1/6P1/6KP/8/8 b - - 16 57\nMove: g5g6\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 16\nFullmove number: 57\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black king g5g6.\nLookup: g5=black king; g6=empty.\nSquares: g5 black king->empty; g6 empty->black king.\nRanks: rank 5 g k->1; rank 6 g 1->k.\nResult FEN: 8/8/6k1/4nR2/6P1/6KP/8/8 w - - 17 58", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "g5g6", "diagnostic": true, "hard_gate": false, "move": "g5g6"}} {"example_id": "perception_00620", "split": "perception", "task_type": "fen_row_application", "fen": "1r6/5pk1/1rpp4/p3p1pq/1bP1P3/1B1P1N2/RP2QP2/5K2 w - - 0 38", "prompt": "Starting FEN: 1r6/5pk1/1rpp4/p3p1pq/1bP1P3/1B1P1N2/RP2QP2/5K2 w - - 0 38\nMove: f1g1\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 38\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 1 5K2->6K1.\nResult FEN: 1r6/5pk1/1rpp4/p3p1pq/1bP1P3/1B1P1N2/RP2QP2/6K1 b - - 1 38", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "f1g1", "_fen_row_application_rank_rewrites": [{"rank": "1", "before": "5K2", "after": "6K1"}], "diagnostic": true, "hard_gate": false, "move": "f1g1", "rank_rewrites": [{"rank": "1", "before": "5K2", "after": "6K1"}]}} {"example_id": "perception_00621", "split": "perception", "task_type": "state_tracking", "fen": "r1bqk1nr/1ppp1ppp/p1n5/2bNp3/4P3/P4P2/1PPP2PP/R1BQKBNR w KQkq - 0 6", "prompt": "Starting FEN: r1bqk1nr/1ppp1ppp/p1n5/2bNp3/4P3/P4P2/1PPP2PP/R1BQKBNR w KQkq - 0 6\nAfter the moves a1b1, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 6\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r1bqk1nr/1ppp1ppp/p1n5/2bNp3/4P3/P4P2/1PPP2PP/1RBQKBNR b Kkq - 1 6", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "a1b1", "_state_tracking_result": "r1bqk1nr/1ppp1ppp/p1n5/2bNp3/4P3/P4P2/1PPP2PP/1RBQKBNR b Kkq - 1 6"}} {"example_id": "perception_00622", "split": "perception", "task_type": "material_inventory", "fen": "r5k1/pp4pp/4Np2/3n4/P6B/8/1r3PPK/R1R5 w - - 2 25", "prompt": "FEN: r5k1/pp4pp/4Np2/3n4/P6B/8/1r3PPK/R1R5 w - - 2 25\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=h2; queen=none; rook=a1,c1; bishop=h4; knight=e6; pawn=f2,g2,a4.\nBlack inventory: king=g8; queen=none; rook=b2,a8; bishop=none; knight=d5; pawn=f6,a7,b7,g7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00623", "split": "perception", "task_type": "material_piece_counts", "fen": "r5k1/p4p1p/1p6/5q2/3Qp3/P4N2/1PP1PK2/R4B1b w - - 2 25", "prompt": "FEN: r5k1/p4p1p/1p6/5q2/3Qp3/P4N2/1PP1PK2/R4B1b w - - 2 25\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=1; bishop=1; knight=1; pawn=4.\nBlack counts: king=1; queen=1; rook=1; bishop=1; knight=0; pawn=5.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00624", "split": "perception", "task_type": "material_value_totals", "fen": "8/p1k3N1/1pn2N1p/4p1p1/8/4P3/PP3PPP/3R2K1 w - - 1 33", "prompt": "FEN: 8/p1k3N1/1pn2N1p/4p1p1/8/4P3/PP3PPP/3R2K1 w - - 1 33\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=5; bishop=0; knight=6; pawn=6; total=17.\nBlack values: king=0; queen=0; rook=0; bishop=0; knight=3; pawn=5; total=8.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00625", "split": "perception", "task_type": "material_balance_trace", "fen": "rn1qkbnr/1b1p1pp1/p3p2p/1pp5/4P3/P2P1Q2/BPP2PPP/RNB1K1NR w KQkq - 0 7", "prompt": "FEN: rn1qkbnr/1b1p1pp1/p3p2p/1pp5/4P3/P2P1Q2/BPP2PPP/RNB1K1NR w KQkq - 0 7\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=e1; queen=f3; rook=a1,h1; bishop=c1,a2; knight=b1,g1; pawn=b2,c2,f2,g2,h2,a3,d3,e4 | black king=e8; queen=d8; rook=a8,h8; bishop=b7,f8; knight=b8,g8; pawn=b5,c5,a6,e6,h6,d7,f7,g7\nCounts: white king=1; queen=1; rook=2; bishop=2; knight=2; pawn=8 | black king=1; queen=1; rook=2; bishop=2; knight=2; pawn=8\nValues: white total=39; black total=39\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00626", "split": "perception", "task_type": "multi_state_tracking", "fen": "r4rk1/1p1nqppp/1bp2n2/p3p3/1PN1P3/P4BPP/2P2PK1/R1B1QR2 b - -", "prompt": "Starting FEN: r4rk1/1p1nqppp/1bp2n2/p3p3/1PN1P3/P4BPP/2P2PK1/R1B1QR2 b - - 0 1\nAfter the moves b6e3 e1e3, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r4rk1/1p1nqppp/2p2n2/p3p3/1PN1P3/P3QBPP/2P2PK1/R1B2R2 b - - 0 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "b6e3 e1e3", "_multi_state_tracking_result": "r4rk1/1p1nqppp/2p2n2/p3p3/1PN1P3/P3QBPP/2P2PK1/R1B2R2 b - - 0 2", "diagnostic": true, "hard_gate": false, "moves": "b6e3 e1e3"}} {"example_id": "perception_00627", "split": "perception", "task_type": "board_print", "fen": "k3N1r1/pb2n1b1/1p3n1p/3pQ3/P2Pp3/1P2P1PB/3N3P/R4RK1 w - - 1 28", "prompt": "Position (FEN): k3N1r1/pb2n1b1/1p3n1p/3pQ3/P2Pp3/1P2P1PB/3N3P/R4RK1 w - - 1 28\nShow me the board.", "gold_answer": "8 k . . . N . r .\n7 p b . . n . b .\n6 . p . . . n . p\n5 . . . p Q . . .\n4 P . . P p . . .\n3 . P . . P . P B\n2 . . . N . . . P\n1 R . . . . R K .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00628", "split": "perception", "task_type": "board_to_fen", "fen": "rn1qk2r/1p2bpp1/p2pbn2/4p1B1/4P3/1NN2Q1P/PPP2P2/R3KB1R b KQkq -", "prompt": "Here is the current board:\n8 r n . q k . . r\n7 . p . . b p p .\n6 p . . p b n . .\n5 . . . . p . B .\n4 . . . . P . . .\n3 . N N . . Q . P\n2 P P P . . P . .\n1 R . . . K B . R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "rn1qk2r/1p2bpp1/p2pbn2/4p1B1/4P3/1NN2Q1P/PPP2P2/R3KB1R b KQkq - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00629", "split": "perception", "task_type": "piece_id", "fen": "8/kp6/p1p5/2P2p2/8/P1PB1Pn1/1PK5/8 b - - 1 36", "prompt": "FEN: 8/kp6/p1p5/2P2p2/8/P1PB1Pn1/1PK5/8 b - - 1 36\nWhat piece is on b7?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "b7"}} {"example_id": "perception_00630", "split": "perception", "task_type": "material_count", "fen": "r4r2/p2k2pp/R1p3p1/4P3/1P6/2N4P/5PP1/5RK1 b - - 0 26", "prompt": "FEN: r4r2/p2k2pp/R1p3p1/4P3/1P6/2N4P/5PP1/5RK1 b - - 0 26\nWhat is the material count for both sides?", "gold_answer": "White (9 pieces): 1 king, 1 knight, 5 pawns, 2 rooks. Black (8 pieces): 1 king, 5 pawns, 2 rooks. White is up 3 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00631", "split": "perception", "task_type": "square_lookup", "fen": "8/1p3pp1/p6p/1k1p4/1PBP4/P4P2/4K1PP/8 b - - 0 31", "prompt": "FEN: 8/1p3pp1/p6p/1k1p4/1PBP4/P4P2/4K1PP/8 b - - 0 31\nWhat is on d5?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "d5=black pawn", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "d5", "diagnostic": true, "hard_gate": false, "square": "d5"}} {"example_id": "perception_00632", "split": "perception", "task_type": "rank_lookup", "fen": "8/8/5kB1/ppb1pPp1/7p/1PPK1P1P/8/8 w - - 2 45", "prompt": "FEN: 8/8/5kB1/ppb1pPp1/7p/1PPK1P1P/8/8 w - - 2 45\nWhat is the compressed FEN row for rank 2?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 2: 8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "2", "_rank_lookup_row": "8", "diagnostic": true, "hard_gate": false, "rank": "2", "fen_rank_row": "8"}} {"example_id": "perception_00633", "split": "perception", "task_type": "square_coordinates", "fen": "3r1rk1/1pN1nppp/p2pb2n/4p3/1PP1P2q/3Q4/P1N1BPPP/2R2RK1 w - -", "prompt": "FEN: 3r1rk1/1pN1nppp/p2pb2n/4p3/1PP1P2q/3Q4/P1N1BPPP/2R2RK1 w - -\nFor square e3, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "e3: file=e; rank=3; fen_row_from_top=6; file_index=5", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "e3", "diagnostic": true, "hard_gate": false, "square": "e3"}} {"example_id": "perception_00634", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r1bqnrk1/ppp2pbp/1n1p2p1/3Pp3/2P1P1P1/2N1BN1P/PP2BP2/R2QK2R b KQ -", "prompt": "FEN: r1bqnrk1/ppp2pbp/1n1p2p1/3Pp3/2P1P1P1/2N1BN1P/PP2BP2/R2QK2R b KQ -\nCompressed rank 5 row: 3Pp3\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 5: a=1; b=1; c=1; d=P; e=p; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "5", "_fen_rank_expansion_row": "3Pp3", "diagnostic": true, "hard_gate": false, "rank": "5", "fen_rank_row": "3Pp3"}} {"example_id": "perception_00635", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r2qkb1r/pp2pppp/2n5/2ppP3/3P2b1/2P2N2/P1P1BPPP/R1BQ1RK1 w kq -", "prompt": "Rank 3 row before: 2P2N2\nFile f changes from N to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 3: 2P2N2 -> 2P5", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "f3e1", "_fen_rank_cell_edit_square": "f3", "_fen_rank_cell_edit_rank": "3", "_fen_rank_cell_edit_file": "f", "_fen_rank_cell_edit_before_row": "2P2N2", "_fen_rank_cell_edit_after_row": "2P5", "_fen_rank_cell_edit_before_fen": "N", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "f3e1", "square": "f3", "rank": "3", "file": "f", "before_row": "2P2N2", "after_row": "2P5", "before_fen": "N", "after_fen": "1"}} {"example_id": "perception_00636", "split": "perception", "task_type": "fen_board_edit", "fen": "rnbq1rk1/pp2ppbp/3p2p1/3pP3/3P1P2/3B1N2/PPP3PP/R1BQK2R w KQ -", "prompt": "Board FEN before: rnbq1rk1/pp2ppbp/3p2p1/3pP3/3P1P2/3B1N2/PPP3PP/R1BQK2R\nApply square edits: d1 Q->1; d2 1->Q\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: rnbq1rk1/pp2ppbp/3p2p1/3pP3/3P1P2/3B1N2/PPPQ2PP/R1B1K2R", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "d1d2", "_fen_board_edit_board_fen_before": "rnbq1rk1/pp2ppbp/3p2p1/3pP3/3P1P2/3B1N2/PPP3PP/R1BQK2R", "_fen_board_edit_board_fen_after": "rnbq1rk1/pp2ppbp/3p2p1/3pP3/3P1P2/3B1N2/PPPQ2PP/R1B1K2R", "_fen_board_edit_edit_text": "d1 Q->1; d2 1->Q", "_fen_board_edit_changed_squares": [{"square": "d1", "before": "white queen", "after": "empty", "before_fen": "Q", "after_fen": "1"}, {"square": "d2", "before": "empty", "after": "white queen", "before_fen": "1", "after_fen": "Q"}], "diagnostic": true, "hard_gate": false, "move": "d1d2", "board_fen_before": "rnbq1rk1/pp2ppbp/3p2p1/3pP3/3P1P2/3B1N2/PPP3PP/R1BQK2R", "board_fen_after": "rnbq1rk1/pp2ppbp/3p2p1/3pP3/3P1P2/3B1N2/PPPQ2PP/R1B1K2R", "edit_text": "d1 Q->1; d2 1->Q", "changed_squares": [{"square": "d1", "before": "white queen", "after": "empty", "before_fen": "Q", "after_fen": "1"}, {"square": "d2", "before": "empty", "after": "white queen", "before_fen": "1", "after_fen": "Q"}]}} {"example_id": "perception_00637", "split": "perception", "task_type": "move_square_edits", "fen": "2b1k2r/1p1pb1pp/2r1p3/p4p2/1nP2B2/3nPN2/PP2KPPP/R2Q3R b k - 1 17", "prompt": "Starting FEN: 2b1k2r/1p1pb1pp/2r1p3/p4p2/1nP2B2/3nPN2/PP2KPPP/R2Q3R b k - 1 17\nMove: h7h5\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: h7=black pawn; h5=empty.\nSquares: h7 black pawn->empty; h5 empty->black pawn.\nRanks: rank 7 h p->1; rank 5 h 1->p.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "h7h5", "diagnostic": true, "hard_gate": false, "move": "h7h5"}} {"example_id": "perception_00638", "split": "perception", "task_type": "fen_assembly", "fen": "8/1k3ppp/8/8/8/8/P4PPP/K7 w - -", "prompt": "Starting FEN: 8/1k3ppp/8/8/8/8/P4PPP/K7 w - - 0 1\nMove: h2h4\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white pawn h2h4.\nLookup: h2=white pawn; h4=empty.\nSquares: h2 white pawn->empty; h4 empty->white pawn.\nRanks: rank 2 h P->1; rank 4 h 1->P.\nResult FEN: 8/1k3ppp/8/8/7P/8/P4PP1/K7 b - - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "h2h4", "diagnostic": true, "hard_gate": false, "move": "h2h4"}} {"example_id": "perception_00639", "split": "perception", "task_type": "fen_row_application", "fen": "8/3k4/4R3/4pK2/4P3/r3P3/8/8 w - -", "prompt": "Starting FEN: 8/3k4/4R3/4pK2/4P3/r3P3/8/8 w - - 0 1\nMove: e6c6\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 6 4R3->2R5.\nResult FEN: 8/3k4/2R5/4pK2/4P3/r3P3/8/8 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "e6c6", "_fen_row_application_rank_rewrites": [{"rank": "6", "before": "4R3", "after": "2R5"}], "diagnostic": true, "hard_gate": false, "move": "e6c6", "rank_rewrites": [{"rank": "6", "before": "4R3", "after": "2R5"}]}} {"example_id": "perception_00640", "split": "perception", "task_type": "state_tracking", "fen": "r1b1kbnr/ppppqppp/8/n7/2B1Pp2/2N2N2/PPPP2PP/R1BQK2R w KQkq -", "prompt": "Starting FEN: r1b1kbnr/ppppqppp/8/n7/2B1Pp2/2N2N2/PPPP2PP/R1BQK2R w KQkq - 0 1\nAfter the moves c4b5, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r1b1kbnr/ppppqppp/8/nB6/4Pp2/2N2N2/PPPP2PP/R1BQK2R b KQkq - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "c4b5", "_state_tracking_result": "r1b1kbnr/ppppqppp/8/nB6/4Pp2/2N2N2/PPPP2PP/R1BQK2R b KQkq - 1 1"}} {"example_id": "perception_00641", "split": "perception", "task_type": "material_inventory", "fen": "r1bq1rk1/b3np2/2pp1p1p/p3p3/3PP3/P1P2N1P/1B2BPP1/1R1Q1RK1 b - - 0 16", "prompt": "FEN: r1bq1rk1/b3np2/2pp1p1p/p3p3/3PP3/P1P2N1P/1B2BPP1/1R1Q1RK1 b - - 0 16\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=d1; rook=b1,f1; bishop=b2,e2; knight=f3; pawn=f2,g2,a3,c3,h3,d4,e4.\nBlack inventory: king=g8; queen=d8; rook=a8,f8; bishop=a7,c8; knight=e7; pawn=a5,e5,c6,d6,f6,h6,f7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00642", "split": "perception", "task_type": "material_piece_counts", "fen": "6k1/5p1p/2N1p1p1/8/p7/5B2/P2r1PPP/R5K1 w - - 0 32", "prompt": "FEN: 6k1/5p1p/2N1p1p1/8/p7/5B2/P2r1PPP/R5K1 w - - 0 32\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=1; bishop=1; knight=1; pawn=4.\nBlack counts: king=1; queen=0; rook=1; bishop=0; knight=0; pawn=5.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00643", "split": "perception", "task_type": "material_value_totals", "fen": "rnbq1rk1/ppp1ppbp/1n4p1/8/2BP4/1PN1PN2/P4PPP/R1BQK2R b KQ -", "prompt": "FEN: rnbq1rk1/ppp1ppbp/1n4p1/8/2BP4/1PN1PN2/P4PPP/R1BQK2R b KQ -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=7; total=38.\nBlack values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=7; total=38.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00644", "split": "perception", "task_type": "material_balance_trace", "fen": "r1r3k1/6p1/p1nb1p1p/1p6/1P1NP3/P4P1P/1R3P2/3R2K1 b - - 1 28", "prompt": "FEN: r1r3k1/6p1/p1nb1p1p/1p6/1P1NP3/P4P1P/1R3P2/3R2K1 b - - 1 28\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=none; rook=d1,b2; bishop=none; knight=d4; pawn=f2,a3,f3,h3,b4,e4 | black king=g8; queen=none; rook=a8,c8; bishop=d6; knight=c6; pawn=b5,a6,f6,h6,g7\nCounts: white king=1; queen=0; rook=2; bishop=0; knight=1; pawn=6 | black king=1; queen=0; rook=2; bishop=1; knight=1; pawn=5\nValues: white total=19; black total=21\nBalance: Black is up 2 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00645", "split": "perception", "task_type": "multi_state_tracking", "fen": "rn1qkb1r/pp3ppp/4pn2/2Pp1b2/5P2/4BNP1/PPP1P2P/RN1QKB1R b KQkq -", "prompt": "Starting FEN: rn1qkb1r/pp3ppp/4pn2/2Pp1b2/5P2/4BNP1/PPP1P2P/RN1QKB1R b KQkq - 0 1\nAfter the moves d8c8 d1d2, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rnq1kb1r/pp3ppp/4pn2/2Pp1b2/5P2/4BNP1/PPPQP2P/RN2KB1R b KQkq - 2 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "d8c8 d1d2", "_multi_state_tracking_result": "rnq1kb1r/pp3ppp/4pn2/2Pp1b2/5P2/4BNP1/PPPQP2P/RN2KB1R b KQkq - 2 2", "diagnostic": true, "hard_gate": false, "moves": "d8c8 d1d2"}} {"example_id": "perception_00646", "split": "perception", "task_type": "board_print", "fen": "r1bq1rk1/ppp1bppp/2n5/3np3/2B5/2PP1N1P/PP3PP1/RNBQ1RK1 b - - 1 8", "prompt": "Position (FEN): r1bq1rk1/ppp1bppp/2n5/3np3/2B5/2PP1N1P/PP3PP1/RNBQ1RK1 b - - 1 8\nShow me the board.", "gold_answer": "8 r . b q . r k .\n7 p p p . b p p p\n6 . . n . . . . .\n5 . . . n p . . .\n4 . . B . . . . .\n3 . . P P . N . P\n2 P P . . . P P .\n1 R N B Q . R K .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00647", "split": "perception", "task_type": "board_to_fen", "fen": "r4rk1/pp2bppp/1q2pn2/2np4/5B2/1P1PPN1P/P1QN1PP1/R4RK1 w - - 0 13", "prompt": "Here is the current board:\n8 r . . . . r k .\n7 p p . . b p p p\n6 . q . . p n . .\n5 . . n p . . . .\n4 . . . . . B . .\n3 . P . P P N . P\n2 P . Q N . P P .\n1 R . . . . R K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 13\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r4rk1/pp2bppp/1q2pn2/2np4/5B2/1P1PPN1P/P1QN1PP1/R4RK1 w - - 0 13", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00648", "split": "perception", "task_type": "piece_id", "fen": "rn1q1rk1/1pp1bppp/p3pn2/3b4/P1QP4/5NP1/1P1NPPBP/R1B2RK1 w - -", "prompt": "FEN: rn1q1rk1/1pp1bppp/p3pn2/3b4/P1QP4/5NP1/1P1NPPBP/R1B2RK1 w - -\nWhat piece is on d8?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black queen", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "d8"}} {"example_id": "perception_00649", "split": "perception", "task_type": "material_count", "fen": "r3k2r/1bqnbppp/p2ppn2/3N2B1/1p1NPP2/3B2Q1/PPP3PP/2KRR3 b kq -", "prompt": "FEN: r3k2r/1bqnbppp/p2ppn2/3N2B1/1p1NPP2/3B2Q1/PPP3PP/2KRR3 b kq -\nWhat is the material count for both sides?", "gold_answer": "White (15 pieces): 2 bishops, 1 king, 2 knights, 7 pawns, 1 queen, 2 rooks. Black (15 pieces): 2 bishops, 1 king, 2 knights, 7 pawns, 1 queen, 2 rooks. Material is equal.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00650", "split": "perception", "task_type": "square_lookup", "fen": "rnb1k2r/pp2ppbp/6p1/q1p5/3PP3/2P1B3/P2Q1PPP/1R2KBNR b Kkq -", "prompt": "FEN: rnb1k2r/pp2ppbp/6p1/q1p5/3PP3/2P1B3/P2Q1PPP/1R2KBNR b Kkq -\nWhat is on b3?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "b3=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "b3", "diagnostic": true, "hard_gate": false, "square": "b3"}} {"example_id": "perception_00651", "split": "perception", "task_type": "rank_lookup", "fen": "r1bq1rk1/pp2bppp/3p1nn1/2p5/3NPP2/2N1B3/PPP1B1PP/R2Q1RK1 w - - 0 11", "prompt": "FEN: r1bq1rk1/pp2bppp/3p1nn1/2p5/3NPP2/2N1B3/PPP1B1PP/R2Q1RK1 w - - 0 11\nWhat is the compressed FEN row for rank 1?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 1: R2Q1RK1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "1", "_rank_lookup_row": "R2Q1RK1", "diagnostic": true, "hard_gate": false, "rank": "1", "fen_rank_row": "R2Q1RK1"}} {"example_id": "perception_00652", "split": "perception", "task_type": "square_coordinates", "fen": "r1b1kb1r/p1q1pppp/1pn2n2/3p4/3P4/2PB1N1P/PP3PP1/RNBQK2R w KQkq -", "prompt": "FEN: r1b1kb1r/p1q1pppp/1pn2n2/3p4/3P4/2PB1N1P/PP3PP1/RNBQK2R w KQkq -\nFor square h3, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "h3: file=h; rank=3; fen_row_from_top=6; file_index=8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "h3", "diagnostic": true, "hard_gate": false, "square": "h3"}} {"example_id": "perception_00653", "split": "perception", "task_type": "fen_rank_expansion", "fen": "8/8/8/8/pk6/n1p5/2K5/8 w - - 6 72", "prompt": "FEN: 8/8/8/8/pk6/n1p5/2K5/8 w - - 6 72\nCompressed rank 6 row: 8\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 6: a=1; b=1; c=1; d=1; e=1; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "6", "_fen_rank_expansion_row": "8", "diagnostic": true, "hard_gate": false, "rank": "6", "fen_rank_row": "8"}} {"example_id": "perception_00654", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "1r1q1rk1/p2b1ppp/1p6/1BQ5/8/8/PPP2PPP/R3K1NR w KQ - 0 12", "prompt": "Rank 6 row before: 1p6\nFile d changes from 1 to Q. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 6: 1p6 -> 1p1Q4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "c5d6", "_fen_rank_cell_edit_square": "d6", "_fen_rank_cell_edit_rank": "6", "_fen_rank_cell_edit_file": "d", "_fen_rank_cell_edit_before_row": "1p6", "_fen_rank_cell_edit_after_row": "1p1Q4", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "Q", "diagnostic": true, "hard_gate": false, "move": "c5d6", "square": "d6", "rank": "6", "file": "d", "before_row": "1p6", "after_row": "1p1Q4", "before_fen": "1", "after_fen": "Q"}} {"example_id": "perception_00655", "split": "perception", "task_type": "fen_board_edit", "fen": "r1bqkb1r/ppp2ppp/3p1n2/8/2BQP3/2N5/PPP2PPP/R1B1K2R b KQkq - 3 7", "prompt": "Board FEN before: r1bqkb1r/ppp2ppp/3p1n2/8/2BQP3/2N5/PPP2PPP/R1B1K2R\nApply square edits: h8 r->1; g8 1->r\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: r1bqkbr1/ppp2ppp/3p1n2/8/2BQP3/2N5/PPP2PPP/R1B1K2R", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "h8g8", "_fen_board_edit_board_fen_before": "r1bqkb1r/ppp2ppp/3p1n2/8/2BQP3/2N5/PPP2PPP/R1B1K2R", "_fen_board_edit_board_fen_after": "r1bqkbr1/ppp2ppp/3p1n2/8/2BQP3/2N5/PPP2PPP/R1B1K2R", "_fen_board_edit_edit_text": "h8 r->1; g8 1->r", "_fen_board_edit_changed_squares": [{"square": "h8", "before": "black rook", "after": "empty", "before_fen": "r", "after_fen": "1"}, {"square": "g8", "before": "empty", "after": "black rook", "before_fen": "1", "after_fen": "r"}], "diagnostic": true, "hard_gate": false, "move": "h8g8", "board_fen_before": "r1bqkb1r/ppp2ppp/3p1n2/8/2BQP3/2N5/PPP2PPP/R1B1K2R", "board_fen_after": "r1bqkbr1/ppp2ppp/3p1n2/8/2BQP3/2N5/PPP2PPP/R1B1K2R", "edit_text": "h8 r->1; g8 1->r", "changed_squares": [{"square": "h8", "before": "black rook", "after": "empty", "before_fen": "r", "after_fen": "1"}, {"square": "g8", "before": "empty", "after": "black rook", "before_fen": "1", "after_fen": "r"}]}} {"example_id": "perception_00656", "split": "perception", "task_type": "move_square_edits", "fen": "2R5/1Q6/4k3/8/8/4K3/8/8 w - -", "prompt": "Starting FEN: 2R5/1Q6/4k3/8/8/4K3/8/8 w - -\nMove: b7d5\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: b7=white queen; d5=empty.\nSquares: b7 white queen->empty; d5 empty->white queen.\nRanks: rank 7 b Q->1; rank 5 d 1->Q.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "b7d5", "diagnostic": true, "hard_gate": false, "move": "b7d5"}} {"example_id": "perception_00657", "split": "perception", "task_type": "fen_assembly", "fen": "r1bqk1nr/ppp2ppp/4p3/3Pp3/1bP1P3/2N5/PP3PPP/R2QKBNR b KQkq - 0 7", "prompt": "Starting FEN: r1bqk1nr/ppp2ppp/4p3/3Pp3/1bP1P3/2N5/PP3PPP/R2QKBNR b KQkq - 0 7\nMove: f7f5\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 7\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black pawn f7f5.\nLookup: f7=black pawn; f5=empty.\nSquares: f7 black pawn->empty; f5 empty->black pawn.\nRanks: rank 7 f p->1; rank 5 f 1->p.\nResult FEN: r1bqk1nr/ppp3pp/4p3/3Ppp2/1bP1P3/2N5/PP3PPP/R2QKBNR w KQkq - 0 8", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "f7f5", "diagnostic": true, "hard_gate": false, "move": "f7f5"}} {"example_id": "perception_00658", "split": "perception", "task_type": "fen_row_application", "fen": "8/8/6p1/R5N1/3k4/3n1K2/8/8 w - -", "prompt": "Starting FEN: 8/8/6p1/R5N1/3k4/3n1K2/8/8 w - - 0 1\nMove: g5e4\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 5 R5N1->R7; rank 4 3k4->3kN3.\nResult FEN: 8/8/6p1/R7/3kN3/3n1K2/8/8 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "g5e4", "_fen_row_application_rank_rewrites": [{"rank": "5", "before": "R5N1", "after": "R7"}, {"rank": "4", "before": "3k4", "after": "3kN3"}], "diagnostic": true, "hard_gate": false, "move": "g5e4", "rank_rewrites": [{"rank": "5", "before": "R5N1", "after": "R7"}, {"rank": "4", "before": "3k4", "after": "3kN3"}]}} {"example_id": "perception_00659", "split": "perception", "task_type": "state_tracking", "fen": "rnbqk2r/p3n1b1/2p1p1pp/1p1p1p2/3P4/4P3/PPP1BPPP/RNBQK1NR b KQkq - 1 10", "prompt": "Starting FEN: rnbqk2r/p3n1b1/2p1p1pp/1p1p1p2/3P4/4P3/PPP1BPPP/RNBQK1NR b KQkq - 1 10\nAfter the moves c8d7, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 1\nFullmove number: 10\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rn1qk2r/p2bn1b1/2p1p1pp/1p1p1p2/3P4/4P3/PPP1BPPP/RNBQK1NR w KQkq - 2 11", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "c8d7", "_state_tracking_result": "rn1qk2r/p2bn1b1/2p1p1pp/1p1p1p2/3P4/4P3/PPP1BPPP/RNBQK1NR w KQkq - 2 11"}} {"example_id": "perception_00660", "split": "perception", "task_type": "material_inventory", "fen": "2r5/p4pkp/2Q3p1/5p2/6P1/8/P6P/5R1K b - - 0 29", "prompt": "FEN: 2r5/p4pkp/2Q3p1/5p2/6P1/8/P6P/5R1K b - - 0 29\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=h1; queen=c6; rook=f1; bishop=none; knight=none; pawn=a2,h2,g4.\nBlack inventory: king=g7; queen=none; rook=c8; bishop=none; knight=none; pawn=f5,g6,a7,f7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00661", "split": "perception", "task_type": "material_piece_counts", "fen": "r4rk1/1pq2p1p/p5p1/8/BPn1Q3/P1P4P/4R1RP/6K1 b - - 2 24", "prompt": "FEN: r4rk1/1pq2p1p/p5p1/8/BPn1Q3/P1P4P/4R1RP/6K1 b - - 2 24\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=1; knight=0; pawn=5.\nBlack counts: king=1; queen=1; rook=2; bishop=0; knight=1; pawn=5.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00662", "split": "perception", "task_type": "material_value_totals", "fen": "r1bq1rk1/pp3ppp/2np1n2/1B2p3/Qb2P3/2N2N2/PPPB1PPP/2KR3R b - - 3 9", "prompt": "FEN: r1bq1rk1/pp3ppp/2np1n2/1B2p3/Qb2P3/2N2N2/PPPB1PPP/2KR3R b - - 3 9\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=7; total=38.\nBlack values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=7; total=38.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00663", "split": "perception", "task_type": "material_balance_trace", "fen": "6k1/1p3pb1/1n1p2pp/3Pp3/1P2P3/2r3PP/5P2/1R3BK1 w - - 2 29", "prompt": "FEN: 6k1/1p3pb1/1n1p2pp/3Pp3/1P2P3/2r3PP/5P2/1R3BK1 w - - 2 29\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=none; rook=b1; bishop=f1; knight=none; pawn=f2,g3,h3,b4,e4,d5 | black king=g8; queen=none; rook=c3; bishop=g7; knight=b6; pawn=e5,d6,g6,h6,b7,f7\nCounts: white king=1; queen=0; rook=1; bishop=1; knight=0; pawn=6 | black king=1; queen=0; rook=1; bishop=1; knight=1; pawn=6\nValues: white total=14; black total=17\nBalance: Black is up 3 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00664", "split": "perception", "task_type": "multi_state_tracking", "fen": "2r2rk1/ppq2ppp/2n1bb2/3p4/1P6/P3P1P1/1BN2PBP/1R1Q1RK1 b - - 2 16", "prompt": "Starting FEN: 2r2rk1/ppq2ppp/2n1bb2/3p4/1P6/P3P1P1/1BN2PBP/1R1Q1RK1 b - - 2 16\nAfter the moves c7e7 b1a1 e7c7, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 2\nFullmove number: 16\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 2r2rk1/ppq2ppp/2n1bb2/3p4/1P6/P3P1P1/1BN2PBP/R2Q1RK1 w - - 5 18", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "c7e7 b1a1 e7c7", "_multi_state_tracking_result": "2r2rk1/ppq2ppp/2n1bb2/3p4/1P6/P3P1P1/1BN2PBP/R2Q1RK1 w - - 5 18", "diagnostic": true, "hard_gate": false, "moves": "c7e7 b1a1 e7c7"}} {"example_id": "perception_00665", "split": "perception", "task_type": "board_print", "fen": "3q1rk1/5ppp/2p1p3/1pPn4/1P1P4/r1B3Q1/5PPP/2R1R1K1 b - - 4 24", "prompt": "Position (FEN): 3q1rk1/5ppp/2p1p3/1pPn4/1P1P4/r1B3Q1/5PPP/2R1R1K1 b - - 4 24\nShow me the board.", "gold_answer": "8 . . . q . r k .\n7 . . . . . p p p\n6 . . p . p . . .\n5 . p P n . . . .\n4 . P . P . . . .\n3 r . B . . . Q .\n2 . . . . . P P P\n1 . . R . R . K .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00666", "split": "perception", "task_type": "board_to_fen", "fen": "8/1p4pk/7p/7P/1q4P1/p7/6K1/8 w - - 0 41", "prompt": "Here is the current board:\n8 . . . . . . . .\n7 . p . . . . p k\n6 . . . . . . . p\n5 . . . . . . . P\n4 . q . . . . P .\n3 p . . . . . . .\n2 . . . . . . K .\n1 . . . . . . . .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 41\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "8/1p4pk/7p/7P/1q4P1/p7/6K1/8 w - - 0 41", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00667", "split": "perception", "task_type": "piece_id", "fen": "8/8/5Q2/8/3K4/6k1/8/1b6 b - -", "prompt": "FEN: 8/8/5Q2/8/3K4/6k1/8/1b6 b - -\nWhat piece is on d4?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white king", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "d4"}} {"example_id": "perception_00668", "split": "perception", "task_type": "material_count", "fen": "r2q1rk1/p2nnppp/2pb4/4p3/2BPP3/1QP2P2/PP5P/RNB1K1R1 b Q -", "prompt": "FEN: r2q1rk1/p2nnppp/2pb4/4p3/2BPP3/1QP2P2/PP5P/RNB1K1R1 b Q -\nWhat is the material count for both sides?", "gold_answer": "White (14 pieces): 2 bishops, 1 king, 1 knight, 7 pawns, 1 queen, 2 rooks. Black (13 pieces): 1 bishop, 1 king, 2 knights, 6 pawns, 1 queen, 2 rooks. White is up 1 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00669", "split": "perception", "task_type": "square_lookup", "fen": "r1bq1rk1/3pbpp1/p1p1p2p/2pnP1NQ/5P2/3P4/PPP3PP/RNB2RK1 w - - 2 11", "prompt": "FEN: r1bq1rk1/3pbpp1/p1p1p2p/2pnP1NQ/5P2/3P4/PPP3PP/RNB2RK1 w - - 2 11\nWhat is on h7?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "h7=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "h7", "diagnostic": true, "hard_gate": false, "square": "h7"}} {"example_id": "perception_00670", "split": "perception", "task_type": "rank_lookup", "fen": "r1q2rk1/pppbbp2/2np3p/8/2PPP3/4nNP1/PP2N1B1/R2QR1K1 w - - 0 20", "prompt": "FEN: r1q2rk1/pppbbp2/2np3p/8/2PPP3/4nNP1/PP2N1B1/R2QR1K1 w - - 0 20\nWhat is the compressed FEN row for rank 8?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 8: r1q2rk1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "8", "_rank_lookup_row": "r1q2rk1", "diagnostic": true, "hard_gate": false, "rank": "8", "fen_rank_row": "r1q2rk1"}} {"example_id": "perception_00671", "split": "perception", "task_type": "square_coordinates", "fen": "rn1qkb1r/pp1n1pp1/2p1p1b1/3p2Pp/3P1B1P/2N1PP1N/PPP5/R2QKB1R b KQkq -", "prompt": "FEN: rn1qkb1r/pp1n1pp1/2p1p1b1/3p2Pp/3P1B1P/2N1PP1N/PPP5/R2QKB1R b KQkq -\nFor square h5, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "h5: file=h; rank=5; fen_row_from_top=4; file_index=8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "h5", "diagnostic": true, "hard_gate": false, "square": "h5"}} {"example_id": "perception_00672", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r3kb1r/ppqbnpp1/1n2p2p/3pP3/3P1PPP/1PPB1N2/3B4/RN1QK2R w KQkq - 5 13", "prompt": "FEN: r3kb1r/ppqbnpp1/1n2p2p/3pP3/3P1PPP/1PPB1N2/3B4/RN1QK2R w KQkq - 5 13\nCompressed rank 6 row: 1n2p2p\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 6: a=1; b=n; c=1; d=1; e=p; f=1; g=1; h=p", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "6", "_fen_rank_expansion_row": "1n2p2p", "diagnostic": true, "hard_gate": false, "rank": "6", "fen_rank_row": "1n2p2p"}} {"example_id": "perception_00673", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r3k1nr/ppp1pp1p/6p1/4b3/8/7P/PPP1KPP1/RN5R w kq - 0 12", "prompt": "Rank 1 row before: RN5R\nFile h changes from R to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 1: RN5R -> RN6", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "h1h2", "_fen_rank_cell_edit_square": "h1", "_fen_rank_cell_edit_rank": "1", "_fen_rank_cell_edit_file": "h", "_fen_rank_cell_edit_before_row": "RN5R", "_fen_rank_cell_edit_after_row": "RN6", "_fen_rank_cell_edit_before_fen": "R", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "h1h2", "square": "h1", "rank": "1", "file": "h", "before_row": "RN5R", "after_row": "RN6", "before_fen": "R", "after_fen": "1"}} {"example_id": "perception_00674", "split": "perception", "task_type": "fen_board_edit", "fen": "1kn5/3Q4/K7/8/8/8/8/8 b - -", "prompt": "Board FEN before: 1kn5/3Q4/K7/8/8/8/8/8\nApply square edits: c8 n->1; d6 1->n\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 1k6/3Q4/K2n4/8/8/8/8/8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "c8d6", "_fen_board_edit_board_fen_before": "1kn5/3Q4/K7/8/8/8/8/8", "_fen_board_edit_board_fen_after": "1k6/3Q4/K2n4/8/8/8/8/8", "_fen_board_edit_edit_text": "c8 n->1; d6 1->n", "_fen_board_edit_changed_squares": [{"square": "c8", "before": "black knight", "after": "empty", "before_fen": "n", "after_fen": "1"}, {"square": "d6", "before": "empty", "after": "black knight", "before_fen": "1", "after_fen": "n"}], "diagnostic": true, "hard_gate": false, "move": "c8d6", "board_fen_before": "1kn5/3Q4/K7/8/8/8/8/8", "board_fen_after": "1k6/3Q4/K2n4/8/8/8/8/8", "edit_text": "c8 n->1; d6 1->n", "changed_squares": [{"square": "c8", "before": "black knight", "after": "empty", "before_fen": "n", "after_fen": "1"}, {"square": "d6", "before": "empty", "after": "black knight", "before_fen": "1", "after_fen": "n"}]}} {"example_id": "perception_00675", "split": "perception", "task_type": "move_square_edits", "fen": "r2qk2r/pp1n1ppp/5n2/2bp4/8/3QP3/PP2NPPP/RNB1K2R b KQkq - 4 10", "prompt": "Starting FEN: r2qk2r/pp1n1ppp/5n2/2bp4/8/3QP3/PP2NPPP/RNB1K2R b KQkq - 4 10\nMove: e8g8\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: e8=black king; g8=empty; f8=empty; h8=black rook.\nSquares: e8 black king->empty; g8 empty->black king; f8 empty->black rook; h8 black rook->empty.\nRanks: rank 8 e k->1; rank 8 g 1->k; rank 8 f 1->r; rank 8 h r->1.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "e8g8", "diagnostic": true, "hard_gate": false, "move": "e8g8"}} {"example_id": "perception_00676", "split": "perception", "task_type": "fen_assembly", "fen": "r3r1k1/p4ppp/1q1n1n2/1ppp4/8/PPQ1PNP1/2P2PBP/R4RK1 b - - 1 20", "prompt": "Starting FEN: r3r1k1/p4ppp/1q1n1n2/1ppp4/8/PPQ1PNP1/2P2PBP/R4RK1 b - - 1 20\nMove: f6h5\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 20\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black knight f6h5.\nLookup: f6=black knight; h5=empty.\nSquares: f6 black knight->empty; h5 empty->black knight.\nRanks: rank 6 f n->1; rank 5 h 1->n.\nResult FEN: r3r1k1/p4ppp/1q1n4/1ppp3n/8/PPQ1PNP1/2P2PBP/R4RK1 w - - 2 21", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "f6h5", "diagnostic": true, "hard_gate": false, "move": "f6h5"}} {"example_id": "perception_00677", "split": "perception", "task_type": "fen_row_application", "fen": "r1bq1rk1/1p2b1pp/p1n1p3/2Pp1p2/1P1Pn3/P4N2/1B2BPPP/RN1Q1RK1 w - -", "prompt": "Starting FEN: r1bq1rk1/1p2b1pp/p1n1p3/2Pp1p2/1P1Pn3/P4N2/1B2BPPP/RN1Q1RK1 w - - 0 1\nMove: a3a4\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 3 P4N2->5N2; rank 4 1P1Pn3->PP1Pn3.\nResult FEN: r1bq1rk1/1p2b1pp/p1n1p3/2Pp1p2/PP1Pn3/5N2/1B2BPPP/RN1Q1RK1 b - - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "a3a4", "_fen_row_application_rank_rewrites": [{"rank": "3", "before": "P4N2", "after": "5N2"}, {"rank": "4", "before": "1P1Pn3", "after": "PP1Pn3"}], "diagnostic": true, "hard_gate": false, "move": "a3a4", "rank_rewrites": [{"rank": "3", "before": "P4N2", "after": "5N2"}, {"rank": "4", "before": "1P1Pn3", "after": "PP1Pn3"}]}} {"example_id": "perception_00678", "split": "perception", "task_type": "state_tracking", "fen": "rnbq1r2/pppnp1kp/3p2p1/8/3P2PP/2N5/PPPQP3/R3KBNR b KQ - 0 10", "prompt": "Starting FEN: rnbq1r2/pppnp1kp/3p2p1/8/3P2PP/2N5/PPPQP3/R3KBNR b KQ - 0 10\nAfter the moves b7b6, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 0\nFullmove number: 10\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rnbq1r2/p1pnp1kp/1p1p2p1/8/3P2PP/2N5/PPPQP3/R3KBNR w KQ - 0 11", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "b7b6", "_state_tracking_result": "rnbq1r2/p1pnp1kp/1p1p2p1/8/3P2PP/2N5/PPPQP3/R3KBNR w KQ - 0 11"}} {"example_id": "perception_00679", "split": "perception", "task_type": "material_inventory", "fen": "1r1k1bnr/p3q1pp/1p1p1p2/1Bp5/2Pp1P2/BP4PP/P2QPKn1/RN4NR b - - 4 18", "prompt": "FEN: 1r1k1bnr/p3q1pp/1p1p1p2/1Bp5/2Pp1P2/BP4PP/P2QPKn1/RN4NR b - - 4 18\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=f2; queen=d2; rook=a1,h1; bishop=a3,b5; knight=b1,g1; pawn=a2,e2,b3,g3,h3,c4,f4.\nBlack inventory: king=d8; queen=e7; rook=b8,h8; bishop=f8; knight=g2,g8; pawn=d4,c5,b6,d6,f6,a7,g7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00680", "split": "perception", "task_type": "material_piece_counts", "fen": "kN6/8/PNK5/8/8/6B1/8/8 b - - 22 76", "prompt": "FEN: kN6/8/PNK5/8/8/6B1/8/8 b - - 22 76\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=0; bishop=1; knight=2; pawn=1.\nBlack counts: king=1; queen=0; rook=0; bishop=0; knight=0; pawn=0.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00681", "split": "perception", "task_type": "material_value_totals", "fen": "8/p7/5pK1/3p3P/P1p1k3/2P2p2/2P5/8 b - - 0 38", "prompt": "FEN: 8/p7/5pK1/3p3P/P1p1k3/2P2p2/2P5/8 b - - 0 38\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=0; bishop=0; knight=0; pawn=4; total=4.\nBlack values: king=0; queen=0; rook=0; bishop=0; knight=0; pawn=5; total=5.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00682", "split": "perception", "task_type": "material_balance_trace", "fen": "rnbq1rk1/pp3ppp/2pb4/3p4/2PPn3/5N1P/PP2BPP1/RNBQ1RK1 b - -", "prompt": "FEN: rnbq1rk1/pp3ppp/2pb4/3p4/2PPn3/5N1P/PP2BPP1/RNBQ1RK1 b - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=d1; rook=a1,f1; bishop=c1,e2; knight=b1,f3; pawn=a2,b2,f2,g2,h3,c4,d4 | black king=g8; queen=d8; rook=a8,f8; bishop=d6,c8; knight=e4,b8; pawn=d5,c6,a7,b7,f7,g7,h7\nCounts: white king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7 | black king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7\nValues: white total=38; black total=38\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00683", "split": "perception", "task_type": "multi_state_tracking", "fen": "3R4/1p5r/5pk1/3pbqp1/1P2p3/P3P1PP/5PK1/2R5 w - - 2 35", "prompt": "Starting FEN: 3R4/1p5r/5pk1/3pbqp1/1P2p3/P3P1PP/5PK1/2R5 w - - 2 35\nAfter the moves d8g8 h7g7 c1g1, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 2\nFullmove number: 35\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 6R1/1p4r1/5pk1/3pbqp1/1P2p3/P3P1PP/5PK1/6R1 b - - 5 36", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "d8g8 h7g7 c1g1", "_multi_state_tracking_result": "6R1/1p4r1/5pk1/3pbqp1/1P2p3/P3P1PP/5PK1/6R1 b - - 5 36", "diagnostic": true, "hard_gate": false, "moves": "d8g8 h7g7 c1g1"}} {"example_id": "perception_00684", "split": "perception", "task_type": "board_print", "fen": "N6r/1p3ppp/p1k1p3/4P3/1B1n1P2/1P6/P5PP/5RK1 b - - 0 20", "prompt": "Position (FEN): N6r/1p3ppp/p1k1p3/4P3/1B1n1P2/1P6/P5PP/5RK1 b - - 0 20\nShow me the board.", "gold_answer": "8 N . . . . . . r\n7 . p . . . p p p\n6 p . k . p . . .\n5 . . . . P . . .\n4 . B . n . P . .\n3 . P . . . . . .\n2 P . . . . . P P\n1 . . . . . R K .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00685", "split": "perception", "task_type": "board_to_fen", "fen": "5r1k/1p2q2p/p1n2pp1/3p4/3p2Q1/2PN3P/PP3PP1/4R1K1 b - -", "prompt": "Here is the current board:\n8 . . . . . r . k\n7 . p . . q . . p\n6 p . n . . p p .\n5 . . . p . . . .\n4 . . . p . . Q .\n3 . . P N . . . P\n2 P P . . . P P .\n1 . . . . R . K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "5r1k/1p2q2p/p1n2pp1/3p4/3p2Q1/2PN3P/PP3PP1/4R1K1 b - - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00686", "split": "perception", "task_type": "piece_id", "fen": "8/2RQ1pk1/3p1bp1/3P3p/4P3/1P5P/P4PP1/6K1 b - - 3 34", "prompt": "FEN: 8/2RQ1pk1/3p1bp1/3P3p/4P3/1P5P/P4PP1/6K1 b - - 3 34\nWhat piece is on h3?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "h3"}} {"example_id": "perception_00687", "split": "perception", "task_type": "material_count", "fen": "1r4qk/2n5/p2p1RQ1/2pP3P/2P5/8/P5P1/2R1N1K1 w - - 1 32", "prompt": "FEN: 1r4qk/2n5/p2p1RQ1/2pP3P/2P5/8/P5P1/2R1N1K1 w - - 1 32\nWhat is the material count for both sides?", "gold_answer": "White (10 pieces): 1 king, 1 knight, 5 pawns, 1 queen, 2 rooks. Black (7 pieces): 1 king, 1 knight, 3 pawns, 1 queen, 1 rook. White is up 7 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00688", "split": "perception", "task_type": "square_lookup", "fen": "8/8/1k1K4/4N3/2B5/8/8/8 w - -", "prompt": "FEN: 8/8/1k1K4/4N3/2B5/8/8/8 w - -\nWhat is on b6?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "b6=black king", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "b6", "diagnostic": true, "hard_gate": false, "square": "b6"}} {"example_id": "perception_00689", "split": "perception", "task_type": "rank_lookup", "fen": "rn1qk2r/pp3ppp/2p1p3/3pN2b/2PPnB2/P1b1P3/1PQ2PPP/R3KB1R w KQkq - 0 10", "prompt": "FEN: rn1qk2r/pp3ppp/2p1p3/3pN2b/2PPnB2/P1b1P3/1PQ2PPP/R3KB1R w KQkq - 0 10\nWhat is the compressed FEN row for rank 5?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 5: 3pN2b", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "5", "_rank_lookup_row": "3pN2b", "diagnostic": true, "hard_gate": false, "rank": "5", "fen_rank_row": "3pN2b"}} {"example_id": "perception_00690", "split": "perception", "task_type": "square_coordinates", "fen": "8/5k2/6p1/5pP1/1R3P1P/5r2/7K/8 w - - 1 37", "prompt": "FEN: 8/5k2/6p1/5pP1/1R3P1P/5r2/7K/8 w - - 1 37\nFor square h4, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "h4: file=h; rank=4; fen_row_from_top=5; file_index=8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "h4", "diagnostic": true, "hard_gate": false, "square": "h4"}} {"example_id": "perception_00691", "split": "perception", "task_type": "fen_rank_expansion", "fen": "1rb5/p3qpkp/2p1p1p1/2PpP2P/Nr3P2/1P1Q1BP1/P5K1/4R3 b - - 2 29", "prompt": "FEN: 1rb5/p3qpkp/2p1p1p1/2PpP2P/Nr3P2/1P1Q1BP1/P5K1/4R3 b - - 2 29\nCompressed rank 1 row: 4R3\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 1: a=1; b=1; c=1; d=1; e=R; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "1", "_fen_rank_expansion_row": "4R3", "diagnostic": true, "hard_gate": false, "rank": "1", "fen_rank_row": "4R3"}} {"example_id": "perception_00692", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r3r1k1/ppp2ppp/3b4/4p3/3n2bN/P2Q2P1/1PP2PBP/R3R1K1 b - - 6 17", "prompt": "Rank 7 row before: ppp2ppp\nFile h changes from p to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 7: ppp2ppp -> ppp2pp1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "h7h6", "_fen_rank_cell_edit_square": "h7", "_fen_rank_cell_edit_rank": "7", "_fen_rank_cell_edit_file": "h", "_fen_rank_cell_edit_before_row": "ppp2ppp", "_fen_rank_cell_edit_after_row": "ppp2pp1", "_fen_rank_cell_edit_before_fen": "p", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "h7h6", "square": "h7", "rank": "7", "file": "h", "before_row": "ppp2ppp", "after_row": "ppp2pp1", "before_fen": "p", "after_fen": "1"}} {"example_id": "perception_00693", "split": "perception", "task_type": "fen_board_edit", "fen": "r2q1r1k/p3np1p/1p2p1p1/3pb3/8/1PPB1Q2/P4PPP/R1B2RK1 w - - 0 20", "prompt": "Board FEN before: r2q1r1k/p3np1p/1p2p1p1/3pb3/8/1PPB1Q2/P4PPP/R1B2RK1\nApply square edits: f3 Q->1; g4 1->Q\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: r2q1r1k/p3np1p/1p2p1p1/3pb3/6Q1/1PPB4/P4PPP/R1B2RK1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "f3g4", "_fen_board_edit_board_fen_before": "r2q1r1k/p3np1p/1p2p1p1/3pb3/8/1PPB1Q2/P4PPP/R1B2RK1", "_fen_board_edit_board_fen_after": "r2q1r1k/p3np1p/1p2p1p1/3pb3/6Q1/1PPB4/P4PPP/R1B2RK1", "_fen_board_edit_edit_text": "f3 Q->1; g4 1->Q", "_fen_board_edit_changed_squares": [{"square": "f3", "before": "white queen", "after": "empty", "before_fen": "Q", "after_fen": "1"}, {"square": "g4", "before": "empty", "after": "white queen", "before_fen": "1", "after_fen": "Q"}], "diagnostic": true, "hard_gate": false, "move": "f3g4", "board_fen_before": "r2q1r1k/p3np1p/1p2p1p1/3pb3/8/1PPB1Q2/P4PPP/R1B2RK1", "board_fen_after": "r2q1r1k/p3np1p/1p2p1p1/3pb3/6Q1/1PPB4/P4PPP/R1B2RK1", "edit_text": "f3 Q->1; g4 1->Q", "changed_squares": [{"square": "f3", "before": "white queen", "after": "empty", "before_fen": "Q", "after_fen": "1"}, {"square": "g4", "before": "empty", "after": "white queen", "before_fen": "1", "after_fen": "Q"}]}} {"example_id": "perception_00694", "split": "perception", "task_type": "move_square_edits", "fen": "1r4k1/RP6/2qPp1p1/3p3p/5r2/8/Q4bPP/1R4K1 w - - 0 30", "prompt": "Starting FEN: 1r4k1/RP6/2qPp1p1/3p3p/5r2/8/Q4bPP/1R4K1 w - - 0 30\nMove: g1h1\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: g1=white king; h1=empty.\nSquares: g1 white king->empty; h1 empty->white king.\nRanks: rank 1 g K->1; rank 1 h 1->K.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "g1h1", "diagnostic": true, "hard_gate": false, "move": "g1h1"}} {"example_id": "perception_00695", "split": "perception", "task_type": "fen_assembly", "fen": "r1bqk2r/pppp1ppp/5n2/2b1p3/B2nP3/2N2N2/PPPP1PPP/R1BQK2R w KQkq -", "prompt": "Starting FEN: r1bqk2r/pppp1ppp/5n2/2b1p3/B2nP3/2N2N2/PPPP1PPP/R1BQK2R w KQkq - 0 1\nMove: a2a3\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white pawn a2a3.\nLookup: a2=white pawn; a3=empty.\nSquares: a2 white pawn->empty; a3 empty->white pawn.\nRanks: rank 2 a P->1; rank 3 a 1->P.\nResult FEN: r1bqk2r/pppp1ppp/5n2/2b1p3/B2nP3/P1N2N2/1PPP1PPP/R1BQK2R b KQkq - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "a2a3", "diagnostic": true, "hard_gate": false, "move": "a2a3"}} {"example_id": "perception_00696", "split": "perception", "task_type": "fen_row_application", "fen": "1k6/8/7R/8/Q1P5/1p6/1P6/2K5 b - - 0 43", "prompt": "Starting FEN: 1k6/8/7R/8/Q1P5/1p6/1P6/2K5 b - - 0 43\nMove: b8c7\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 43\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 8 1k6->8; rank 7 8->2k5.\nResult FEN: 8/2k5/7R/8/Q1P5/1p6/1P6/2K5 w - - 1 44", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "b8c7", "_fen_row_application_rank_rewrites": [{"rank": "8", "before": "1k6", "after": "8"}, {"rank": "7", "before": "8", "after": "2k5"}], "diagnostic": true, "hard_gate": false, "move": "b8c7", "rank_rewrites": [{"rank": "8", "before": "1k6", "after": "8"}, {"rank": "7", "before": "8", "after": "2k5"}]}} {"example_id": "perception_00697", "split": "perception", "task_type": "state_tracking", "fen": "3r2k1/p4p1p/4N3/2p2p2/8/1P2P1P1/r4PBP/1R2K2R b K - 0 22", "prompt": "Starting FEN: 3r2k1/p4p1p/4N3/2p2p2/8/1P2P1P1/r4PBP/1R2K2R b K - 0 22\nAfter the moves a2f2, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: K\nEn passant: none\nHalfmove clock: 0\nFullmove number: 22\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 3r2k1/p4p1p/4N3/2p2p2/8/1P2P1P1/5rBP/1R2K2R w K - 0 23", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "a2f2", "_state_tracking_result": "3r2k1/p4p1p/4N3/2p2p2/8/1P2P1P1/5rBP/1R2K2R w K - 0 23"}} {"example_id": "perception_00698", "split": "perception", "task_type": "material_inventory", "fen": "8/p3k2r/3Nb2p/4P1b1/2p5/P1P3R1/1P6/R5K1 w - - 4 38", "prompt": "FEN: 8/p3k2r/3Nb2p/4P1b1/2p5/P1P3R1/1P6/R5K1 w - - 4 38\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=none; rook=a1,g3; bishop=none; knight=d6; pawn=b2,a3,c3,e5.\nBlack inventory: king=e7; queen=none; rook=h7; bishop=g5,e6; knight=none; pawn=c4,h6,a7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00699", "split": "perception", "task_type": "material_piece_counts", "fen": "8/8/8/7p/8/6k1/3K4/8 b - - 3 48", "prompt": "FEN: 8/8/8/7p/8/6k1/3K4/8 b - - 3 48\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=0; bishop=0; knight=0; pawn=0.\nBlack counts: king=1; queen=0; rook=0; bishop=0; knight=0; pawn=1.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00700", "split": "perception", "task_type": "material_value_totals", "fen": "rnbqk2r/pp3ppp/4pb2/3p4/2Pp4/2N1PN2/PP3PPP/R2QKB1R w KQkq -", "prompt": "FEN: rnbqk2r/pp3ppp/4pb2/3p4/2Pp4/2N1PN2/PP3PPP/R2QKB1R w KQkq -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=3; knight=6; pawn=7; total=35.\nBlack values: king=0; queen=9; rook=10; bishop=6; knight=3; pawn=8; total=36.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00701", "split": "perception", "task_type": "material_balance_trace", "fen": "r2qkbnr/p1pb1ppp/2pp4/8/4P3/3B4/PPP2PPP/RNBQK2R b KQkq -", "prompt": "FEN: r2qkbnr/p1pb1ppp/2pp4/8/4P3/3B4/PPP2PPP/RNBQK2R b KQkq -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=e1; queen=d1; rook=a1,h1; bishop=c1,d3; knight=b1; pawn=a2,b2,c2,f2,g2,h2,e4 | black king=e8; queen=d8; rook=a8,h8; bishop=d7,f8; knight=g8; pawn=c6,d6,a7,c7,f7,g7,h7\nCounts: white king=1; queen=1; rook=2; bishop=2; knight=1; pawn=7 | black king=1; queen=1; rook=2; bishop=2; knight=1; pawn=7\nValues: white total=35; black total=35\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00702", "split": "perception", "task_type": "multi_state_tracking", "fen": "8/8/8/2k2p2/P5pp/4K2P/6P1/8 w - -", "prompt": "Starting FEN: 8/8/8/2k2p2/P5pp/4K2P/6P1/8 w - - 0 1\nAfter the moves g2g3 g4h3, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 8/8/8/2k2p2/P6p/4K1Pp/8/8 w - - 0 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "g2g3 g4h3", "_multi_state_tracking_result": "8/8/8/2k2p2/P6p/4K1Pp/8/8 w - - 0 2", "diagnostic": true, "hard_gate": false, "moves": "g2g3 g4h3"}} {"example_id": "perception_00703", "split": "perception", "task_type": "board_print", "fen": "rnb1k2r/3pn2p/p1p3p1/1p3pP1/2PN1P2/1P1BP3/P5q1/R1BQKR2 w Qkq - 2 17", "prompt": "Position (FEN): rnb1k2r/3pn2p/p1p3p1/1p3pP1/2PN1P2/1P1BP3/P5q1/R1BQKR2 w Qkq - 2 17\nShow me the board.", "gold_answer": "8 r n b . k . . r\n7 . . . p n . . p\n6 p . p . . . p .\n5 . p . . . p P .\n4 . . P N . P . .\n3 . P . B P . . .\n2 P . . . . . q .\n1 R . B Q K R . .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00704", "split": "perception", "task_type": "board_to_fen", "fen": "rnbq1k1Q/pp1p1p1p/4p1p1/8/2P5/1P2P3/P4PPP/RN2KBNR b KQ - 4 12", "prompt": "Here is the current board:\n8 r n b q . k . Q\n7 p p . p . p . p\n6 . . . . p . p .\n5 . . . . . . . .\n4 . . P . . . . .\n3 . P . . P . . .\n2 P . . . . P P P\n1 R N . . K B N R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 4\nFullmove number: 12\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "rnbq1k1Q/pp1p1p1p/4p1p1/8/2P5/1P2P3/P4PPP/RN2KBNR b KQ - 4 12", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00705", "split": "perception", "task_type": "piece_id", "fen": "2k1r3/ppp2ppp/2n5/2b2q2/2Q5/2N2pPn/PPPP2BP/R1B2K2 w - - 0 18", "prompt": "FEN: 2k1r3/ppp2ppp/2n5/2b2q2/2Q5/2N2pPn/PPPP2BP/R1B2K2 w - - 0 18\nWhat piece is on c5?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black bishop", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "c5"}} {"example_id": "perception_00706", "split": "perception", "task_type": "material_count", "fen": "r2q1rk1/1ppb1pp1/p3pn1p/3pP3/3P4/2PB2PP/PP1N1P2/R2Q1RK1 b - -", "prompt": "FEN: r2q1rk1/1ppb1pp1/p3pn1p/3pP3/3P4/2PB2PP/PP1N1P2/R2Q1RK1 b - -\nWhat is the material count for both sides?", "gold_answer": "White (14 pieces): 1 bishop, 1 king, 1 knight, 8 pawns, 1 queen, 2 rooks. Black (14 pieces): 1 bishop, 1 king, 1 knight, 8 pawns, 1 queen, 2 rooks. Material is equal.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00707", "split": "perception", "task_type": "square_lookup", "fen": "1r2kb1r/pb1q1ppp/8/4p3/3p1P2/2N4P/PPP3P1/1RBQ1RK1 w k - 0 15", "prompt": "FEN: 1r2kb1r/pb1q1ppp/8/4p3/3p1P2/2N4P/PPP3P1/1RBQ1RK1 w k - 0 15\nWhat is on f2?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "f2=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "f2", "diagnostic": true, "hard_gate": false, "square": "f2"}} {"example_id": "perception_00708", "split": "perception", "task_type": "rank_lookup", "fen": "r1b2bnr/pppkpppp/8/1N2n3/8/8/PPPP1PPP/R1BQR1K1 w - - 0 11", "prompt": "FEN: r1b2bnr/pppkpppp/8/1N2n3/8/8/PPPP1PPP/R1BQR1K1 w - - 0 11\nWhat is the compressed FEN row for rank 5?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 5: 1N2n3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "5", "_rank_lookup_row": "1N2n3", "diagnostic": true, "hard_gate": false, "rank": "5", "fen_rank_row": "1N2n3"}} {"example_id": "perception_00709", "split": "perception", "task_type": "square_coordinates", "fen": "r1b5/pp1pp2k/6pp/4qr2/4N2P/3Q4/PPP2PP1/1K1R3R b - -", "prompt": "FEN: r1b5/pp1pp2k/6pp/4qr2/4N2P/3Q4/PPP2PP1/1K1R3R b - -\nFor square g2, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "g2: file=g; rank=2; fen_row_from_top=7; file_index=7", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "g2", "diagnostic": true, "hard_gate": false, "square": "g2"}} {"example_id": "perception_00710", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r5k1/pp4p1/1p1N3p/7q/4P3/2P2r2/PP4R1/6K1 w - - 4 33", "prompt": "FEN: r5k1/pp4p1/1p1N3p/7q/4P3/2P2r2/PP4R1/6K1 w - - 4 33\nCompressed rank 5 row: 7q\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 5: a=1; b=1; c=1; d=1; e=1; f=1; g=1; h=q", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "5", "_fen_rank_expansion_row": "7q", "diagnostic": true, "hard_gate": false, "rank": "5", "fen_rank_row": "7q"}} {"example_id": "perception_00711", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "8/2k2p2/4p1p1/N1KpPb1p/1Pp2P1P/2P3P1/8/8 b - -", "prompt": "Rank 6 row before: 4p1p1\nFile f changes from 1 to p. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 6: 4p1p1 -> 4ppp1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "f7f6", "_fen_rank_cell_edit_square": "f6", "_fen_rank_cell_edit_rank": "6", "_fen_rank_cell_edit_file": "f", "_fen_rank_cell_edit_before_row": "4p1p1", "_fen_rank_cell_edit_after_row": "4ppp1", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "p", "diagnostic": true, "hard_gate": false, "move": "f7f6", "square": "f6", "rank": "6", "file": "f", "before_row": "4p1p1", "after_row": "4ppp1", "before_fen": "1", "after_fen": "p"}} {"example_id": "perception_00712", "split": "perception", "task_type": "fen_board_edit", "fen": "k7/8/2K5/8/8/8/8/1R6 w - -", "prompt": "Board FEN before: k7/8/2K5/8/8/8/8/1R6\nApply square edits: b1 R->1; g1 1->R\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: k7/8/2K5/8/8/8/8/6R1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "b1g1", "_fen_board_edit_board_fen_before": "k7/8/2K5/8/8/8/8/1R6", "_fen_board_edit_board_fen_after": "k7/8/2K5/8/8/8/8/6R1", "_fen_board_edit_edit_text": "b1 R->1; g1 1->R", "_fen_board_edit_changed_squares": [{"square": "b1", "before": "white rook", "after": "empty", "before_fen": "R", "after_fen": "1"}, {"square": "g1", "before": "empty", "after": "white rook", "before_fen": "1", "after_fen": "R"}], "diagnostic": true, "hard_gate": false, "move": "b1g1", "board_fen_before": "k7/8/2K5/8/8/8/8/1R6", "board_fen_after": "k7/8/2K5/8/8/8/8/6R1", "edit_text": "b1 R->1; g1 1->R", "changed_squares": [{"square": "b1", "before": "white rook", "after": "empty", "before_fen": "R", "after_fen": "1"}, {"square": "g1", "before": "empty", "after": "white rook", "before_fen": "1", "after_fen": "R"}]}} {"example_id": "perception_00713", "split": "perception", "task_type": "move_square_edits", "fen": "r3kb1r/2B1pppp/p4n2/3p4/2nP2b1/2N1P3/PP3PPP/R3KBNR w KQkq -", "prompt": "Starting FEN: r3kb1r/2B1pppp/p4n2/3p4/2nP2b1/2N1P3/PP3PPP/R3KBNR w KQkq -\nMove: a2a4\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: a2=white pawn; a4=empty.\nSquares: a2 white pawn->empty; a4 empty->white pawn.\nRanks: rank 2 a P->1; rank 4 a 1->P.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "a2a4", "diagnostic": true, "hard_gate": false, "move": "a2a4"}} {"example_id": "perception_00714", "split": "perception", "task_type": "fen_assembly", "fen": "r2rb1k1/pp3pp1/4p1p1/1P2B3/2PnR3/2Q3PP/P5P1/R5K1 b - -", "prompt": "Starting FEN: r2rb1k1/pp3pp1/4p1p1/1P2B3/2PnR3/2Q3PP/P5P1/R5K1 b - - 0 1\nMove: a8c8\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black rook a8c8.\nLookup: a8=black rook; c8=empty.\nSquares: a8 black rook->empty; c8 empty->black rook.\nRanks: rank 8 a r->1; rank 8 c 1->r.\nResult FEN: 2rrb1k1/pp3pp1/4p1p1/1P2B3/2PnR3/2Q3PP/P5P1/R5K1 w - - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "a8c8", "diagnostic": true, "hard_gate": false, "move": "a8c8"}} {"example_id": "perception_00715", "split": "perception", "task_type": "fen_row_application", "fen": "rnb1kbnr/ppp2ppp/8/3P4/7q/6p1/PPPP2KP/RNBQ1BNR b kq - 0 6", "prompt": "Starting FEN: rnb1kbnr/ppp2ppp/8/3P4/7q/6p1/PPPP2KP/RNBQ1BNR b kq - 0 6\nMove: h4e4\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: kq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 6\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 4 7q->4q3.\nResult FEN: rnb1kbnr/ppp2ppp/8/3P4/4q3/6p1/PPPP2KP/RNBQ1BNR w kq - 1 7", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "h4e4", "_fen_row_application_rank_rewrites": [{"rank": "4", "before": "7q", "after": "4q3"}], "diagnostic": true, "hard_gate": false, "move": "h4e4", "rank_rewrites": [{"rank": "4", "before": "7q", "after": "4q3"}]}} {"example_id": "perception_00716", "split": "perception", "task_type": "state_tracking", "fen": "r2r2k1/p4ppp/2p1qnn1/2P1p3/1P2p3/P1N1P3/1B3PPP/R1Q2RK1 w - - 7 21", "prompt": "Starting FEN: r2r2k1/p4ppp/2p1qnn1/2P1p3/1P2p3/P1N1P3/1B3PPP/R1Q2RK1 w - - 7 21\nAfter the moves c1d2, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 7\nFullmove number: 21\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r2r2k1/p4ppp/2p1qnn1/2P1p3/1P2p3/P1N1P3/1B1Q1PPP/R4RK1 b - - 8 21", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "c1d2", "_state_tracking_result": "r2r2k1/p4ppp/2p1qnn1/2P1p3/1P2p3/P1N1P3/1B1Q1PPP/R4RK1 b - - 8 21"}} {"example_id": "perception_00717", "split": "perception", "task_type": "material_inventory", "fen": "5B2/8/p1p4p/3k2p1/5p2/1PK2P2/P5PP/8 b - - 2 34", "prompt": "FEN: 5B2/8/p1p4p/3k2p1/5p2/1PK2P2/P5PP/8 b - - 2 34\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=c3; queen=none; rook=none; bishop=f8; knight=none; pawn=a2,g2,h2,b3,f3.\nBlack inventory: king=d5; queen=none; rook=none; bishop=none; knight=none; pawn=f4,g5,a6,c6,h6.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00718", "split": "perception", "task_type": "material_piece_counts", "fen": "1rr3k1/1p4pp/2pbN3/p3p3/P2P4/4P3/5PPP/1RR3K1 b - - 1 23", "prompt": "FEN: 1rr3k1/1p4pp/2pbN3/p3p3/P2P4/4P3/5PPP/1RR3K1 b - - 1 23\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=2; bishop=0; knight=1; pawn=6.\nBlack counts: king=1; queen=0; rook=2; bishop=1; knight=0; pawn=6.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00719", "split": "perception", "task_type": "material_value_totals", "fen": "6k1/3n1pp1/4pn1p/3pN3/1b6/4P1B1/5PPP/4K3 w - -", "prompt": "FEN: 6k1/3n1pp1/4pn1p/3pN3/1b6/4P1B1/5PPP/4K3 w - -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=0; bishop=3; knight=3; pawn=4; total=10.\nBlack values: king=0; queen=0; rook=0; bishop=3; knight=6; pawn=5; total=14.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00720", "split": "perception", "task_type": "material_balance_trace", "fen": "6k1/3r2p1/2R4p/p6P/2p1p3/2P2r2/PP2KP1R/8 b - - 0 35", "prompt": "FEN: 6k1/3r2p1/2R4p/p6P/2p1p3/2P2r2/PP2KP1R/8 b - - 0 35\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=e2; queen=none; rook=h2,c6; bishop=none; knight=none; pawn=a2,b2,f2,c3,h5 | black king=g8; queen=none; rook=f3,d7; bishop=none; knight=none; pawn=c4,e4,a5,h6,g7\nCounts: white king=1; queen=0; rook=2; bishop=0; knight=0; pawn=5 | black king=1; queen=0; rook=2; bishop=0; knight=0; pawn=5\nValues: white total=15; black total=15\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00721", "split": "perception", "task_type": "multi_state_tracking", "fen": "r2qkbnr/pp2pppp/3p2n1/2pP4/2P1PP2/5b1P/PP4P1/RNBQKB1R w KQkq - 0 8", "prompt": "Starting FEN: r2qkbnr/pp2pppp/3p2n1/2pP4/2P1PP2/5b1P/PP4P1/RNBQKB1R w KQkq - 0 8\nAfter the moves d1f3 a8c8 e1e2, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 8\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 2rqkbnr/pp2pppp/3p2n1/2pP4/2P1PP2/5Q1P/PP2K1P1/RNB2B1R b k - 2 9", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "d1f3 a8c8 e1e2", "_multi_state_tracking_result": "2rqkbnr/pp2pppp/3p2n1/2pP4/2P1PP2/5Q1P/PP2K1P1/RNB2B1R b k - 2 9", "diagnostic": true, "hard_gate": false, "moves": "d1f3 a8c8 e1e2"}} {"example_id": "perception_00722", "split": "perception", "task_type": "board_print", "fen": "1r1q1rk1/pp3ppp/3bp3/1Q1pN3/3PbP2/1P2P3/PB4PP/2R2RK1 b - -", "prompt": "Position (FEN): 1r1q1rk1/pp3ppp/3bp3/1Q1pN3/3PbP2/1P2P3/PB4PP/2R2RK1 b - -\nShow me the board.", "gold_answer": "8 . r . q . r k .\n7 p p . . . p p p\n6 . . . b p . . .\n5 . Q . p N . . .\n4 . . . P b P . .\n3 . P . . P . . .\n2 P B . . . . P P\n1 . . R . . R K .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00723", "split": "perception", "task_type": "board_to_fen", "fen": "rn2kb1r/ppp2p2/4p2q/4Nbp1/Q1PPp3/P3P3/1P4PP/RNB2RK1 b kq - 2 12", "prompt": "Here is the current board:\n8 r n . . k b . r\n7 p p p . . p . .\n6 . . . . p . . q\n5 . . . . N b p .\n4 Q . P P p . . .\n3 P . . . P . . .\n2 . P . . . . P P\n1 R N B . . R K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: kq\nEn passant: none\nHalfmove clock: 2\nFullmove number: 12\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "rn2kb1r/ppp2p2/4p2q/4Nbp1/Q1PPp3/P3P3/1P4PP/RNB2RK1 b kq - 2 12", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00724", "split": "perception", "task_type": "piece_id", "fen": "r2qkb1r/1pp2ppp/n3pn2/3p3Q/3P4/4P3/1PP2PPP/RNB1K1NR w KQkq - 2 8", "prompt": "FEN: r2qkb1r/1pp2ppp/n3pn2/3p3Q/3P4/4P3/1PP2PPP/RNB1K1NR w KQkq - 2 8\nWhat piece is on c2?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "c2"}} {"example_id": "perception_00725", "split": "perception", "task_type": "material_count", "fen": "1R6/3qbppk/6n1/3pB1Pp/2pP2b1/p1P3N1/P1Q2PP1/6K1 b - -", "prompt": "FEN: 1R6/3qbppk/6n1/3pB1Pp/2pP2b1/p1P3N1/P1Q2PP1/6K1 b - -\nWhat is the material count for both sides?", "gold_answer": "White (11 pieces): 1 bishop, 1 king, 1 knight, 6 pawns, 1 queen, 1 rook. Black (11 pieces): 2 bishops, 1 king, 1 knight, 6 pawns, 1 queen. White is up 2 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00726", "split": "perception", "task_type": "square_lookup", "fen": "8/8/8/8/B7/2K1P3/4b3/2k5 b - -", "prompt": "FEN: 8/8/8/8/B7/2K1P3/4b3/2k5 b - -\nWhat is on e2?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "e2=black bishop", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "e2", "diagnostic": true, "hard_gate": false, "square": "e2"}} {"example_id": "perception_00727", "split": "perception", "task_type": "rank_lookup", "fen": "4kbnr/1p1npp1p/3p2p1/qPp4Q/4P3/2NP4/1P1K1PPP/r1BR4 w k - 0 13", "prompt": "FEN: 4kbnr/1p1npp1p/3p2p1/qPp4Q/4P3/2NP4/1P1K1PPP/r1BR4 w k - 0 13\nWhat is the compressed FEN row for rank 6?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 6: 3p2p1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "6", "_rank_lookup_row": "3p2p1", "diagnostic": true, "hard_gate": false, "rank": "6", "fen_rank_row": "3p2p1"}} {"example_id": "perception_00728", "split": "perception", "task_type": "square_coordinates", "fen": "1rr5/2k5/3Q2P1/4P1P1/p2P4/Pp1K4/8/2q5 b - - 3 39", "prompt": "FEN: 1rr5/2k5/3Q2P1/4P1P1/p2P4/Pp1K4/8/2q5 b - - 3 39\nFor square d6, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "d6: file=d; rank=6; fen_row_from_top=3; file_index=4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "d6", "diagnostic": true, "hard_gate": false, "square": "d6"}} {"example_id": "perception_00729", "split": "perception", "task_type": "fen_rank_expansion", "fen": "rn2kbnr/pb2qppp/1pppp3/8/3PP3/2P1B1P1/PP2BP1P/RN1QK1NR b KQkq - 0 7", "prompt": "FEN: rn2kbnr/pb2qppp/1pppp3/8/3PP3/2P1B1P1/PP2BP1P/RN1QK1NR b KQkq - 0 7\nCompressed rank 3 row: 2P1B1P1\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 3: a=1; b=1; c=P; d=1; e=B; f=1; g=P; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "3", "_fen_rank_expansion_row": "2P1B1P1", "diagnostic": true, "hard_gate": false, "rank": "3", "fen_rank_row": "2P1B1P1"}} {"example_id": "perception_00730", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "5k2/1pq1r1bQ/p2r1p2/3np3/2BpN3/5P2/PPP5/1K1R2R1 w - -", "prompt": "Rank 4 row before: 2BpN3\nFile e changes from N to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 4: 2BpN3 -> 2Bp4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "e4d6", "_fen_rank_cell_edit_square": "e4", "_fen_rank_cell_edit_rank": "4", "_fen_rank_cell_edit_file": "e", "_fen_rank_cell_edit_before_row": "2BpN3", "_fen_rank_cell_edit_after_row": "2Bp4", "_fen_rank_cell_edit_before_fen": "N", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "e4d6", "square": "e4", "rank": "4", "file": "e", "before_row": "2BpN3", "after_row": "2Bp4", "before_fen": "N", "after_fen": "1"}} {"example_id": "perception_00731", "split": "perception", "task_type": "fen_board_edit", "fen": "1r1q1rk1/2p1ppbp/p2pbnp1/8/1n1P4/P1N1PNP1/1P2QPBP/R1BR2K1 b - -", "prompt": "Board FEN before: 1r1q1rk1/2p1ppbp/p2pbnp1/8/1n1P4/P1N1PNP1/1P2QPBP/R1BR2K1\nApply square edits: b4 n->1; c2 1->n\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 1r1q1rk1/2p1ppbp/p2pbnp1/8/3P4/P1N1PNP1/1Pn1QPBP/R1BR2K1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "b4c2", "_fen_board_edit_board_fen_before": "1r1q1rk1/2p1ppbp/p2pbnp1/8/1n1P4/P1N1PNP1/1P2QPBP/R1BR2K1", "_fen_board_edit_board_fen_after": "1r1q1rk1/2p1ppbp/p2pbnp1/8/3P4/P1N1PNP1/1Pn1QPBP/R1BR2K1", "_fen_board_edit_edit_text": "b4 n->1; c2 1->n", "_fen_board_edit_changed_squares": [{"square": "b4", "before": "black knight", "after": "empty", "before_fen": "n", "after_fen": "1"}, {"square": "c2", "before": "empty", "after": "black knight", "before_fen": "1", "after_fen": "n"}], "diagnostic": true, "hard_gate": false, "move": "b4c2", "board_fen_before": "1r1q1rk1/2p1ppbp/p2pbnp1/8/1n1P4/P1N1PNP1/1P2QPBP/R1BR2K1", "board_fen_after": "1r1q1rk1/2p1ppbp/p2pbnp1/8/3P4/P1N1PNP1/1Pn1QPBP/R1BR2K1", "edit_text": "b4 n->1; c2 1->n", "changed_squares": [{"square": "b4", "before": "black knight", "after": "empty", "before_fen": "n", "after_fen": "1"}, {"square": "c2", "before": "empty", "after": "black knight", "before_fen": "1", "after_fen": "n"}]}} {"example_id": "perception_00732", "split": "perception", "task_type": "move_square_edits", "fen": "r1q2rk1/3nbppp/1pp1pn2/2Pp4/1P1P1B2/2NQPN2/5PPP/R4RK1 b - -", "prompt": "Starting FEN: r1q2rk1/3nbppp/1pp1pn2/2Pp4/1P1P1B2/2NQPN2/5PPP/R4RK1 b - -\nMove: e7d8\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: e7=black bishop; d8=empty.\nSquares: e7 black bishop->empty; d8 empty->black bishop.\nRanks: rank 7 e b->1; rank 8 d 1->b.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "e7d8", "diagnostic": true, "hard_gate": false, "move": "e7d8"}} {"example_id": "perception_00733", "split": "perception", "task_type": "fen_assembly", "fen": "8/3kP3/8/PN4B1/K3r3/8/8/8 w - -", "prompt": "Starting FEN: 8/3kP3/8/PN4B1/K3r3/8/8/8 w - - 0 1\nMove: b5d4\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white knight b5d4.\nLookup: b5=white knight; d4=empty.\nSquares: b5 white knight->empty; d4 empty->white knight.\nRanks: rank 5 b N->1; rank 4 d 1->N.\nResult FEN: 8/3kP3/8/P5B1/K2Nr3/8/8/8 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "b5d4", "diagnostic": true, "hard_gate": false, "move": "b5d4"}} {"example_id": "perception_00734", "split": "perception", "task_type": "fen_row_application", "fen": "1R6/1p2rpk1/p1p3p1/3p4/1P6/P2K4/8/8 w - - 2 38", "prompt": "Starting FEN: 1R6/1p2rpk1/p1p3p1/3p4/1P6/P2K4/8/8 w - - 2 38\nMove: d3c3\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 2\nFullmove number: 38\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 3 P2K4->P1K5.\nResult FEN: 1R6/1p2rpk1/p1p3p1/3p4/1P6/P1K5/8/8 b - - 3 38", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "d3c3", "_fen_row_application_rank_rewrites": [{"rank": "3", "before": "P2K4", "after": "P1K5"}], "diagnostic": true, "hard_gate": false, "move": "d3c3", "rank_rewrites": [{"rank": "3", "before": "P2K4", "after": "P1K5"}]}} {"example_id": "perception_00735", "split": "perception", "task_type": "state_tracking", "fen": "5K2/1p4q1/p7/8/8/1k6/8/8 w - - 0 60", "prompt": "Starting FEN: 5K2/1p4q1/p7/8/8/1k6/8/8 w - - 0 60\nAfter the moves f8e8, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 60\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 4K3/1p4q1/p7/8/8/1k6/8/8 b - - 1 60", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "f8e8", "_state_tracking_result": "4K3/1p4q1/p7/8/8/1k6/8/8 b - - 1 60"}} {"example_id": "perception_00736", "split": "perception", "task_type": "material_inventory", "fen": "3r2k1/3q1pp1/1R3n1p/8/8/3B1QPP/P4P2/6K1 w - - 1 29", "prompt": "FEN: 3r2k1/3q1pp1/1R3n1p/8/8/3B1QPP/P4P2/6K1 w - - 1 29\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=f3; rook=b6; bishop=d3; knight=none; pawn=a2,f2,g3,h3.\nBlack inventory: king=g8; queen=d7; rook=d8; bishop=none; knight=f6; pawn=h6,f7,g7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00737", "split": "perception", "task_type": "material_piece_counts", "fen": "r4rk1/pQpn2pp/5p2/8/3q4/3B4/P1PB2PP/R3R1K1 w - - 3 19", "prompt": "FEN: r4rk1/pQpn2pp/5p2/8/3q4/3B4/P1PB2PP/R3R1K1 w - - 3 19\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=2; knight=0; pawn=4.\nBlack counts: king=1; queen=1; rook=2; bishop=0; knight=1; pawn=5.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00738", "split": "perception", "task_type": "material_value_totals", "fen": "1k6/3R4/2K5/2N5/8/8/2n5/8 w - -", "prompt": "FEN: 1k6/3R4/2K5/2N5/8/8/2n5/8 w - -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=5; bishop=0; knight=3; pawn=0; total=8.\nBlack values: king=0; queen=0; rook=0; bishop=0; knight=3; pawn=0; total=3.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00739", "split": "perception", "task_type": "material_balance_trace", "fen": "2br3r/p3k1p1/1p5p/P1n1Pp1B/8/4B2P/2P2PP1/RN4K1 b - - 0 23", "prompt": "FEN: 2br3r/p3k1p1/1p5p/P1n1Pp1B/8/4B2P/2P2PP1/RN4K1 b - - 0 23\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=none; rook=a1; bishop=e3,h5; knight=b1; pawn=c2,f2,g2,h3,a5,e5 | black king=e7; queen=none; rook=d8,h8; bishop=c8; knight=c5; pawn=f5,b6,h6,a7,g7\nCounts: white king=1; queen=0; rook=1; bishop=2; knight=1; pawn=6 | black king=1; queen=0; rook=2; bishop=1; knight=1; pawn=5\nValues: white total=20; black total=21\nBalance: Black is up 1 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00740", "split": "perception", "task_type": "multi_state_tracking", "fen": "4k3/pp2b3/3p2p1/2r1r1Np/4P2P/2P1NP2/PP4P1/R4RK1 w - - 3 26", "prompt": "Starting FEN: 4k3/pp2b3/3p2p1/2r1r1Np/4P2P/2P1NP2/PP4P1/R4RK1 w - - 3 26\nAfter the moves e3d1 e5e6, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 3\nFullmove number: 26\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 4k3/pp2b3/3pr1p1/2r3Np/4P2P/2P2P2/PP4P1/R2N1RK1 w - - 5 27", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "e3d1 e5e6", "_multi_state_tracking_result": "4k3/pp2b3/3pr1p1/2r3Np/4P2P/2P2P2/PP4P1/R2N1RK1 w - - 5 27", "diagnostic": true, "hard_gate": false, "moves": "e3d1 e5e6"}} {"example_id": "perception_00741", "split": "perception", "task_type": "board_print", "fen": "r4k2/pp4p1/n2b4/8/3q4/4pB1P/PP2Q1P1/R5KR w - - 0 32", "prompt": "Position (FEN): r4k2/pp4p1/n2b4/8/3q4/4pB1P/PP2Q1P1/R5KR w - - 0 32\nShow me the board.", "gold_answer": "8 r . . . . k . .\n7 p p . . . . p .\n6 n . . b . . . .\n5 . . . . . . . .\n4 . . . q . . . .\n3 . . . . p B . P\n2 P P . . Q . P .\n1 R . . . . . K R\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00742", "split": "perception", "task_type": "board_to_fen", "fen": "6r1/7p/p2k1p2/2p1p3/P3b3/3r3B/5PPP/2R2RK1 w - - 4 25", "prompt": "Here is the current board:\n8 . . . . . . r .\n7 . . . . . . . p\n6 p . . k . p . .\n5 . . p . p . . .\n4 P . . . b . . .\n3 . . . r . . . B\n2 . . . . . P P P\n1 . . R . . R K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 4\nFullmove number: 25\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "6r1/7p/p2k1p2/2p1p3/P3b3/3r3B/5PPP/2R2RK1 w - - 4 25", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00743", "split": "perception", "task_type": "piece_id", "fen": "r1bqk1nr/1p2ppbp/p2p2p1/4n3/3NP3/2N1BP2/PPPQ2PP/R3KB1R w KQkq - 4 9", "prompt": "FEN: r1bqk1nr/1p2ppbp/p2p2p1/4n3/3NP3/2N1BP2/PPPQ2PP/R3KB1R w KQkq - 4 9\nWhat piece is on e3?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white bishop", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "e3"}} {"example_id": "perception_00744", "split": "perception", "task_type": "material_count", "fen": "rn1qkb1r/ppp2ppp/3p1n2/4P3/2Bp4/5b2/PPP2PPP/RNBQ1RK1 w kq -", "prompt": "FEN: rn1qkb1r/ppp2ppp/3p1n2/4P3/2Bp4/5b2/PPP2PPP/RNBQ1RK1 w kq -\nWhat is the material count for both sides?", "gold_answer": "White (14 pieces): 2 bishops, 1 king, 1 knight, 7 pawns, 1 queen, 2 rooks. Black (16 pieces): 2 bishops, 1 king, 2 knights, 8 pawns, 1 queen, 2 rooks. Black is up 4 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00745", "split": "perception", "task_type": "square_lookup", "fen": "rn1qr1k1/5ppp/2p1p3/p1B5/1p1P4/P3PN2/1Q3PPP/2R2bK1 w - - 0 17", "prompt": "FEN: rn1qr1k1/5ppp/2p1p3/p1B5/1p1P4/P3PN2/1Q3PPP/2R2bK1 w - - 0 17\nWhat is on c1?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "c1=white rook", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "c1", "diagnostic": true, "hard_gate": false, "square": "c1"}} {"example_id": "perception_00746", "split": "perception", "task_type": "rank_lookup", "fen": "8/8/2k5/Q7/3K4/3N4/8/8 b - -", "prompt": "FEN: 8/8/2k5/Q7/3K4/3N4/8/8 b - -\nWhat is the compressed FEN row for rank 3?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 3: 3N4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "3", "_rank_lookup_row": "3N4", "diagnostic": true, "hard_gate": false, "rank": "3", "fen_rank_row": "3N4"}} {"example_id": "perception_00747", "split": "perception", "task_type": "square_coordinates", "fen": "rn1qkbnr/pbpp1ppp/1p2p3/8/2BPP3/2N5/PPP2PPP/R1BQK1NR b KQkq - 0 4", "prompt": "FEN: rn1qkbnr/pbpp1ppp/1p2p3/8/2BPP3/2N5/PPP2PPP/R1BQK1NR b KQkq - 0 4\nFor square e1, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "e1: file=e; rank=1; fen_row_from_top=8; file_index=5", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "e1", "diagnostic": true, "hard_gate": false, "square": "e1"}} {"example_id": "perception_00748", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r1bqkr2/pp6/3p1Bp1/n3p2p/1N1pP3/P2P2Q1/BPP3PP/R3K2R b KQq - 0 17", "prompt": "FEN: r1bqkr2/pp6/3p1Bp1/n3p2p/1N1pP3/P2P2Q1/BPP3PP/R3K2R b KQq - 0 17\nCompressed rank 5 row: n3p2p\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 5: a=n; b=1; c=1; d=1; e=p; f=1; g=1; h=p", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "5", "_fen_rank_expansion_row": "n3p2p", "diagnostic": true, "hard_gate": false, "rank": "5", "fen_rank_row": "n3p2p"}} {"example_id": "perception_00749", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r3kb1r/1pp2ppp/p1n5/3qp3/8/1PNP1b2/PBP2PPP/R2Q1RK1 w kq - 0 11", "prompt": "Rank 2 row before: PBP2PPP\nFile g changes from P to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 2: PBP2PPP -> PBP2P1P", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "g2g3", "_fen_rank_cell_edit_square": "g2", "_fen_rank_cell_edit_rank": "2", "_fen_rank_cell_edit_file": "g", "_fen_rank_cell_edit_before_row": "PBP2PPP", "_fen_rank_cell_edit_after_row": "PBP2P1P", "_fen_rank_cell_edit_before_fen": "P", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "g2g3", "square": "g2", "rank": "2", "file": "g", "before_row": "PBP2PPP", "after_row": "PBP2P1P", "before_fen": "P", "after_fen": "1"}} {"example_id": "perception_00750", "split": "perception", "task_type": "fen_board_edit", "fen": "2r1kb1r/1bqn1ppp/p3p3/1p2P1P1/2p2P1Q/2P1P3/P1BN3P/R1B2RK1 b k - 1 17", "prompt": "Board FEN before: 2r1kb1r/1bqn1ppp/p3p3/1p2P1P1/2p2P1Q/2P1P3/P1BN3P/R1B2RK1\nApply square edits: h7 p->1; h6 1->p\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 2r1kb1r/1bqn1pp1/p3p2p/1p2P1P1/2p2P1Q/2P1P3/P1BN3P/R1B2RK1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "h7h6", "_fen_board_edit_board_fen_before": "2r1kb1r/1bqn1ppp/p3p3/1p2P1P1/2p2P1Q/2P1P3/P1BN3P/R1B2RK1", "_fen_board_edit_board_fen_after": "2r1kb1r/1bqn1pp1/p3p2p/1p2P1P1/2p2P1Q/2P1P3/P1BN3P/R1B2RK1", "_fen_board_edit_edit_text": "h7 p->1; h6 1->p", "_fen_board_edit_changed_squares": [{"square": "h7", "before": "black pawn", "after": "empty", "before_fen": "p", "after_fen": "1"}, {"square": "h6", "before": "empty", "after": "black pawn", "before_fen": "1", "after_fen": "p"}], "diagnostic": true, "hard_gate": false, "move": "h7h6", "board_fen_before": "2r1kb1r/1bqn1ppp/p3p3/1p2P1P1/2p2P1Q/2P1P3/P1BN3P/R1B2RK1", "board_fen_after": "2r1kb1r/1bqn1pp1/p3p2p/1p2P1P1/2p2P1Q/2P1P3/P1BN3P/R1B2RK1", "edit_text": "h7 p->1; h6 1->p", "changed_squares": [{"square": "h7", "before": "black pawn", "after": "empty", "before_fen": "p", "after_fen": "1"}, {"square": "h6", "before": "empty", "after": "black pawn", "before_fen": "1", "after_fen": "p"}]}} {"example_id": "perception_00751", "split": "perception", "task_type": "move_square_edits", "fen": "br2r1k1/p4pp1/3q1n1p/4PQ1P/3B4/2PB1P2/P5P1/R4RK1 b - - 0 24", "prompt": "Starting FEN: br2r1k1/p4pp1/3q1n1p/4PQ1P/3B4/2PB1P2/P5P1/R4RK1 b - - 0 24\nMove: e8e6\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: e8=black rook; e6=empty.\nSquares: e8 black rook->empty; e6 empty->black rook.\nRanks: rank 8 e r->1; rank 6 e 1->r.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "e8e6", "diagnostic": true, "hard_gate": false, "move": "e8e6"}} {"example_id": "perception_00752", "split": "perception", "task_type": "fen_assembly", "fen": "5rk1/5Qpp/8/8/8/1BR5/8/1K6 b - -", "prompt": "Starting FEN: 5rk1/5Qpp/8/8/8/1BR5/8/1K6 b - - 0 1\nMove: g8h8\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black king g8h8.\nLookup: g8=black king; h8=empty.\nSquares: g8 black king->empty; h8 empty->black king.\nRanks: rank 8 g k->1; rank 8 h 1->k.\nResult FEN: 5r1k/5Qpp/8/8/8/1BR5/8/1K6 w - - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "g8h8", "diagnostic": true, "hard_gate": false, "move": "g8h8"}} {"example_id": "perception_00753", "split": "perception", "task_type": "fen_row_application", "fen": "8/8/2P5/8/R5p1/5k1p/P6P/4B2K w - - 0 49", "prompt": "Starting FEN: 8/8/2P5/8/R5p1/5k1p/P6P/4B2K w - - 0 49\nMove: e1d2\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 49\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 1 4B2K->7K; rank 2 P6P->P2B3P.\nResult FEN: 8/8/2P5/8/R5p1/5k1p/P2B3P/7K b - - 1 49", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "e1d2", "_fen_row_application_rank_rewrites": [{"rank": "1", "before": "4B2K", "after": "7K"}, {"rank": "2", "before": "P6P", "after": "P2B3P"}], "diagnostic": true, "hard_gate": false, "move": "e1d2", "rank_rewrites": [{"rank": "1", "before": "4B2K", "after": "7K"}, {"rank": "2", "before": "P6P", "after": "P2B3P"}]}} {"example_id": "perception_00754", "split": "perception", "task_type": "state_tracking", "fen": "rn1qkb1r/pp3ppp/4bn2/2pp4/3P4/2N3P1/PPP1NPBP/R1BQK2R b KQkq -", "prompt": "Starting FEN: rn1qkb1r/pp3ppp/4bn2/2pp4/3P4/2N3P1/PPP1NPBP/R1BQK2R b KQkq - 0 1\nAfter the moves c5c4, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rn1qkb1r/pp3ppp/4bn2/3p4/2pP4/2N3P1/PPP1NPBP/R1BQK2R w KQkq - 0 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "c5c4", "_state_tracking_result": "rn1qkb1r/pp3ppp/4bn2/3p4/2pP4/2N3P1/PPP1NPBP/R1BQK2R w KQkq - 0 2"}} {"example_id": "perception_00755", "split": "perception", "task_type": "material_inventory", "fen": "8/p5bk/2p3pp/3p4/8/PB3PRN/KPb2r2/8 b - - 1 32", "prompt": "FEN: 8/p5bk/2p3pp/3p4/8/PB3PRN/KPb2r2/8 b - - 1 32\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=a2; queen=none; rook=g3; bishop=b3; knight=h3; pawn=b2,a3,f3.\nBlack inventory: king=h7; queen=none; rook=f2; bishop=c2,g7; knight=none; pawn=d5,c6,g6,h6,a7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00756", "split": "perception", "task_type": "material_piece_counts", "fen": "r2q1rk1/pp1nbppp/4pn2/2p1p3/5P2/3P1N2/PPP3PP/RNBQ1RK1 w - - 0 10", "prompt": "FEN: r2q1rk1/pp1nbppp/4pn2/2p1p3/5P2/3P1N2/PPP3PP/RNBQ1RK1 w - - 0 10\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=1; knight=2; pawn=7.\nBlack counts: king=1; queen=1; rook=2; bishop=1; knight=2; pawn=8.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00757", "split": "perception", "task_type": "material_value_totals", "fen": "r2qk2r/1pp2p2/p1nb2pp/4p3/3pPPQ1/1N1P3P/PPP3P1/R1B2RK1 b kq - 0 13", "prompt": "FEN: r2qk2r/1pp2p2/p1nb2pp/4p3/3pPPQ1/1N1P3P/PPP3P1/R1B2RK1 b kq - 0 13\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=3; knight=3; pawn=8; total=33.\nBlack values: king=0; queen=9; rook=10; bishop=3; knight=3; pawn=8; total=33.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00758", "split": "perception", "task_type": "material_balance_trace", "fen": "8/p7/1pkp2K1/8/PP4RP/2r5/8/8 b - - 0 44", "prompt": "FEN: 8/p7/1pkp2K1/8/PP4RP/2r5/8/8 b - - 0 44\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g6; queen=none; rook=g4; bishop=none; knight=none; pawn=a4,b4,h4 | black king=c6; queen=none; rook=c3; bishop=none; knight=none; pawn=b6,d6,a7\nCounts: white king=1; queen=0; rook=1; bishop=0; knight=0; pawn=3 | black king=1; queen=0; rook=1; bishop=0; knight=0; pawn=3\nValues: white total=8; black total=8\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00759", "split": "perception", "task_type": "multi_state_tracking", "fen": "8/8/8/5R2/5B2/7P/4kPPK/r1r5 b - - 10 51", "prompt": "Starting FEN: 8/8/8/5R2/5B2/7P/4kPPK/r1r5 b - - 10 51\nAfter the moves c1f1 f4b8 f1h1, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 10\nFullmove number: 51\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 1B6/8/8/5R2/8/7P/4kPPK/r6r w - - 13 53", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "c1f1 f4b8 f1h1", "_multi_state_tracking_result": "1B6/8/8/5R2/8/7P/4kPPK/r6r w - - 13 53", "diagnostic": true, "hard_gate": false, "moves": "c1f1 f4b8 f1h1"}} {"example_id": "perception_00760", "split": "perception", "task_type": "board_print", "fen": "rnbqkbnr/p2p1ppp/1pp1p3/8/4P3/2NP4/PPP2PPP/R1BQKBNR w KQkq - 0 4", "prompt": "Position (FEN): rnbqkbnr/p2p1ppp/1pp1p3/8/4P3/2NP4/PPP2PPP/R1BQKBNR w KQkq - 0 4\nShow me the board.", "gold_answer": "8 r n b q k b n r\n7 p . . p . p p p\n6 . p p . p . . .\n5 . . . . . . . .\n4 . . . . P . . .\n3 . . N P . . . .\n2 P P P . . P P P\n1 R . B Q K B N R\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00761", "split": "perception", "task_type": "board_to_fen", "fen": "rnbq1rk1/ppp1bppp/3p1n2/8/8/2NP1N2/PPP1BPPP/R1BQ1RK1 b - -", "prompt": "Here is the current board:\n8 r n b q . r k .\n7 p p p . b p p p\n6 . . . p . n . .\n5 . . . . . . . .\n4 . . . . . . . .\n3 . . N P . N . .\n2 P P P . B P P P\n1 R . B Q . R K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "rnbq1rk1/ppp1bppp/3p1n2/8/8/2NP1N2/PPP1BPPP/R1BQ1RK1 b - - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00762", "split": "perception", "task_type": "piece_id", "fen": "r1b1kb1Q/pp5p/2nq1pp1/2pp4/3P4/2P5/PP2BPPP/RN2K1NR b KQq - 1 10", "prompt": "FEN: r1b1kb1Q/pp5p/2nq1pp1/2pp4/3P4/2P5/PP2BPPP/RN2K1NR b KQq - 1 10\nWhat piece is on b1?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white knight", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "b1"}} {"example_id": "perception_00763", "split": "perception", "task_type": "material_count", "fen": "R1b5/2r5/2p2k2/2N2p2/1P1K4/6P1/5P2/8 w - -", "prompt": "FEN: R1b5/2r5/2p2k2/2N2p2/1P1K4/6P1/5P2/8 w - -\nWhat is the material count for both sides?", "gold_answer": "White (6 pieces): 1 king, 1 knight, 3 pawns, 1 rook. Black (5 pieces): 1 bishop, 1 king, 2 pawns, 1 rook. White is up 1 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00764", "split": "perception", "task_type": "square_lookup", "fen": "R3r3/3k4/8/8/Pp2R3/1P4P1/3r1P1P/6K1 w - - 3 43", "prompt": "FEN: R3r3/3k4/8/8/Pp2R3/1P4P1/3r1P1P/6K1 w - - 3 43\nWhat is on b4?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "b4=black pawn", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "b4", "diagnostic": true, "hard_gate": false, "square": "b4"}} {"example_id": "perception_00765", "split": "perception", "task_type": "rank_lookup", "fen": "r4rk1/pb6/2p1pn1p/qp6/1b1P4/4PN2/PPQ2PPP/R4RK1 w - -", "prompt": "FEN: r4rk1/pb6/2p1pn1p/qp6/1b1P4/4PN2/PPQ2PPP/R4RK1 w - -\nWhat is the compressed FEN row for rank 2?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 2: PPQ2PPP", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "2", "_rank_lookup_row": "PPQ2PPP", "diagnostic": true, "hard_gate": false, "rank": "2", "fen_rank_row": "PPQ2PPP"}} {"example_id": "perception_00766", "split": "perception", "task_type": "square_coordinates", "fen": "4k1nr/p1pnq2p/1b1p4/3Qp1N1/PP2P3/2P5/5PPP/RNB2RK1 b k - 0 17", "prompt": "FEN: 4k1nr/p1pnq2p/1b1p4/3Qp1N1/PP2P3/2P5/5PPP/RNB2RK1 b k - 0 17\nFor square a6, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "a6: file=a; rank=6; fen_row_from_top=3; file_index=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "a6", "diagnostic": true, "hard_gate": false, "square": "a6"}} {"example_id": "perception_00767", "split": "perception", "task_type": "fen_rank_expansion", "fen": "3k3r/pp3R2/2p1R2b/6p1/2P5/1P1N2BP/P6K/8 b - - 0 33", "prompt": "FEN: 3k3r/pp3R2/2p1R2b/6p1/2P5/1P1N2BP/P6K/8 b - - 0 33\nCompressed rank 8 row: 3k3r\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 8: a=1; b=1; c=1; d=k; e=1; f=1; g=1; h=r", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "8", "_fen_rank_expansion_row": "3k3r", "diagnostic": true, "hard_gate": false, "rank": "8", "fen_rank_row": "3k3r"}} {"example_id": "perception_00768", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r1bqkbnr/pp3ppp/2n5/1BPpp3/3P4/2N5/PP3PPP/R1BQK1NR b KQkq -", "prompt": "Rank 8 row before: r1bqkbnr\nFile f changes from b to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 8: r1bqkbnr -> r1bqk1nr", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "f8d6", "_fen_rank_cell_edit_square": "f8", "_fen_rank_cell_edit_rank": "8", "_fen_rank_cell_edit_file": "f", "_fen_rank_cell_edit_before_row": "r1bqkbnr", "_fen_rank_cell_edit_after_row": "r1bqk1nr", "_fen_rank_cell_edit_before_fen": "b", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "f8d6", "square": "f8", "rank": "8", "file": "f", "before_row": "r1bqkbnr", "after_row": "r1bqk1nr", "before_fen": "b", "after_fen": "1"}} {"example_id": "perception_00769", "split": "perception", "task_type": "fen_board_edit", "fen": "4rk2/3r1p1p/3b1p2/P1p1p3/1pPpB3/1P1N4/2P4P/R6K w - - 1 29", "prompt": "Board FEN before: 4rk2/3r1p1p/3b1p2/P1p1p3/1pPpB3/1P1N4/2P4P/R6K\nApply square edits: d3 N->1; e5 p->N\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 4rk2/3r1p1p/3b1p2/P1p1N3/1pPpB3/1P6/2P4P/R6K", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "d3e5", "_fen_board_edit_board_fen_before": "4rk2/3r1p1p/3b1p2/P1p1p3/1pPpB3/1P1N4/2P4P/R6K", "_fen_board_edit_board_fen_after": "4rk2/3r1p1p/3b1p2/P1p1N3/1pPpB3/1P6/2P4P/R6K", "_fen_board_edit_edit_text": "d3 N->1; e5 p->N", "_fen_board_edit_changed_squares": [{"square": "d3", "before": "white knight", "after": "empty", "before_fen": "N", "after_fen": "1"}, {"square": "e5", "before": "black pawn", "after": "white knight", "before_fen": "p", "after_fen": "N"}], "diagnostic": true, "hard_gate": false, "move": "d3e5", "board_fen_before": "4rk2/3r1p1p/3b1p2/P1p1p3/1pPpB3/1P1N4/2P4P/R6K", "board_fen_after": "4rk2/3r1p1p/3b1p2/P1p1N3/1pPpB3/1P6/2P4P/R6K", "edit_text": "d3 N->1; e5 p->N", "changed_squares": [{"square": "d3", "before": "white knight", "after": "empty", "before_fen": "N", "after_fen": "1"}, {"square": "e5", "before": "black pawn", "after": "white knight", "before_fen": "p", "after_fen": "N"}]}} {"example_id": "perception_00770", "split": "perception", "task_type": "move_square_edits", "fen": "rnbq1rk1/pp2ppbp/2pp1np1/8/2BPP3/2N1B3/PPP1NPPP/R2Q1RK1 b - - 1 7", "prompt": "Starting FEN: rnbq1rk1/pp2ppbp/2pp1np1/8/2BPP3/2N1B3/PPP1NPPP/R2Q1RK1 b - - 1 7\nMove: c8f5\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: c8=black bishop; f5=empty.\nSquares: c8 black bishop->empty; f5 empty->black bishop.\nRanks: rank 8 c b->1; rank 5 f 1->b.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "c8f5", "diagnostic": true, "hard_gate": false, "move": "c8f5"}} {"example_id": "perception_00771", "split": "perception", "task_type": "fen_assembly", "fen": "r1bk4/pp1p1p1p/2n1p1p1/8/2P5/1PNBP3/P4PPP/R3K1NR b KQ - 3 15", "prompt": "Starting FEN: r1bk4/pp1p1p1p/2n1p1p1/8/2P5/1PNBP3/P4PPP/R3K1NR b KQ - 3 15\nMove: f7f5\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 3\nFullmove number: 15\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black pawn f7f5.\nLookup: f7=black pawn; f5=empty.\nSquares: f7 black pawn->empty; f5 empty->black pawn.\nRanks: rank 7 f p->1; rank 5 f 1->p.\nResult FEN: r1bk4/pp1p3p/2n1p1p1/5p2/2P5/1PNBP3/P4PPP/R3K1NR w KQ - 0 16", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "f7f5", "diagnostic": true, "hard_gate": false, "move": "f7f5"}} {"example_id": "perception_00772", "split": "perception", "task_type": "fen_row_application", "fen": "5rk1/pb2bp1n/1p2pP1Q/3q3P/8/5N2/P4P2/1B1K1N1R w - -", "prompt": "Starting FEN: 5rk1/pb2bp1n/1p2pP1Q/3q3P/8/5N2/P4P2/1B1K1N1R w - - 0 1\nMove: h6d2\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 6 1p2pP1Q->1p2pP2; rank 2 P4P2->P2Q1P2.\nResult FEN: 5rk1/pb2bp1n/1p2pP2/3q3P/8/5N2/P2Q1P2/1B1K1N1R b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "h6d2", "_fen_row_application_rank_rewrites": [{"rank": "6", "before": "1p2pP1Q", "after": "1p2pP2"}, {"rank": "2", "before": "P4P2", "after": "P2Q1P2"}], "diagnostic": true, "hard_gate": false, "move": "h6d2", "rank_rewrites": [{"rank": "6", "before": "1p2pP1Q", "after": "1p2pP2"}, {"rank": "2", "before": "P4P2", "after": "P2Q1P2"}]}} {"example_id": "perception_00773", "split": "perception", "task_type": "state_tracking", "fen": "r1b2rk1/ppp3p1/5p1p/4p3/2N1P3/3P1RP1/PPP2KP1/R7 b - - 1 19", "prompt": "Starting FEN: r1b2rk1/ppp3p1/5p1p/4p3/2N1P3/3P1RP1/PPP2KP1/R7 b - - 1 19\nAfter the moves c8e6, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 19\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r4rk1/ppp3p1/4bp1p/4p3/2N1P3/3P1RP1/PPP2KP1/R7 w - - 2 20", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "c8e6", "_state_tracking_result": "r4rk1/ppp3p1/4bp1p/4p3/2N1P3/3P1RP1/PPP2KP1/R7 w - - 2 20"}} {"example_id": "perception_00774", "split": "perception", "task_type": "material_inventory", "fen": "rnbq1rk1/ppp2ppp/1b6/3nP1B1/3P4/2N2N2/PP4PP/R2QKB1R b KQ -", "prompt": "FEN: rnbq1rk1/ppp2ppp/1b6/3nP1B1/3P4/2N2N2/PP4PP/R2QKB1R b KQ -\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=e1; queen=d1; rook=a1,h1; bishop=f1,g5; knight=c3,f3; pawn=a2,b2,g2,h2,d4,e5.\nBlack inventory: king=g8; queen=d8; rook=a8,f8; bishop=b6,c8; knight=d5,b8; pawn=a7,b7,c7,f7,g7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00775", "split": "perception", "task_type": "material_piece_counts", "fen": "2r1kb1r/pp1n1p1p/4bpp1/q1pp4/3P4/1PP1P1PP/P3NPB1/RN1QK2R w KQk - 0 11", "prompt": "FEN: 2r1kb1r/pp1n1p1p/4bpp1/q1pp4/3P4/1PP1P1PP/P3NPB1/RN1QK2R w KQk - 0 11\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=1; knight=2; pawn=8.\nBlack counts: king=1; queen=1; rook=2; bishop=2; knight=1; pawn=8.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00776", "split": "perception", "task_type": "material_value_totals", "fen": "r1b4r/pp1p4/1k5p/1NbQp1q1/2BpP3/8/PPP2PPP/R3K2R w KQ - 5 15", "prompt": "FEN: r1b4r/pp1p4/1k5p/1NbQp1q1/2BpP3/8/PPP2PPP/R3K2R w KQ - 5 15\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=3; knight=3; pawn=7; total=32.\nBlack values: king=0; queen=9; rook=10; bishop=6; knight=0; pawn=6; total=31.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00777", "split": "perception", "task_type": "material_balance_trace", "fen": "r1bqk2r/ppp2ppp/2n2n2/4N3/1bpP1B2/4P3/PP1N1PPP/R2QKB1R b KQkq -", "prompt": "FEN: r1bqk2r/ppp2ppp/2n2n2/4N3/1bpP1B2/4P3/PP1N1PPP/R2QKB1R b KQkq -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=e1; queen=d1; rook=a1,h1; bishop=f1,f4; knight=d2,e5; pawn=a2,b2,f2,g2,h2,e3,d4 | black king=e8; queen=d8; rook=a8,h8; bishop=b4,c8; knight=c6,f6; pawn=c4,a7,b7,c7,f7,g7,h7\nCounts: white king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7 | black king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7\nValues: white total=38; black total=38\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00778", "split": "perception", "task_type": "multi_state_tracking", "fen": "8/p7/1kp5/2N5/2p4p/8/PPB4P/1K2R3 b - - 0 38", "prompt": "Starting FEN: 8/p7/1kp5/2N5/2p4p/8/PPB4P/1K2R3 b - - 0 38\nAfter the moves c4c3 c2b3, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 38\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 8/p7/1kp5/2N5/7p/1Bp5/PP5P/1K2R3 b - - 1 39", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "c4c3 c2b3", "_multi_state_tracking_result": "8/p7/1kp5/2N5/7p/1Bp5/PP5P/1K2R3 b - - 1 39", "diagnostic": true, "hard_gate": false, "moves": "c4c3 c2b3"}} {"example_id": "perception_00779", "split": "perception", "task_type": "board_print", "fen": "r3kbnr/p1p2ppp/1p1p4/4n1B1/4P3/1Q5P/PPP2P2/RN2KB1R w KQkq - 0 10", "prompt": "Position (FEN): r3kbnr/p1p2ppp/1p1p4/4n1B1/4P3/1Q5P/PPP2P2/RN2KB1R w KQkq - 0 10\nShow me the board.", "gold_answer": "8 r . . . k b n r\n7 p . p . . p p p\n6 . p . p . . . .\n5 . . . . n . B .\n4 . . . . P . . .\n3 . Q . . . . . P\n2 P P P . . P . .\n1 R N . . K B . R\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00780", "split": "perception", "task_type": "board_to_fen", "fen": "rnbq1rk1/ppp1p1bp/3p1np1/5p2/3P4/1P3NP1/P1P1PPBP/RNBQ1RK1 w - - 0 7", "prompt": "Here is the current board:\n8 r n b q . r k .\n7 p p p . p . b p\n6 . . . p . n p .\n5 . . . . . p . .\n4 . . . P . . . .\n3 . P . . . N P .\n2 P . P . P P B P\n1 R N B Q . R K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 7\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "rnbq1rk1/ppp1p1bp/3p1np1/5p2/3P4/1P3NP1/P1P1PPBP/RNBQ1RK1 w - - 0 7", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00781", "split": "perception", "task_type": "piece_id", "fen": "5k2/8/8/p7/P4p2/8/1P1K4/8 w - -", "prompt": "FEN: 5k2/8/8/p7/P4p2/8/1P1K4/8 w - -\nWhat piece is on a5?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "a5"}} {"example_id": "perception_00782", "split": "perception", "task_type": "material_count", "fen": "5k2/bR3ppp/p1p5/6r1/1P6/8/8/1K6 b - - 0 47", "prompt": "FEN: 5k2/bR3ppp/p1p5/6r1/1P6/8/8/1K6 b - - 0 47\nWhat is the material count for both sides?", "gold_answer": "White (3 pieces): 1 king, 1 pawn, 1 rook. Black (8 pieces): 1 bishop, 1 king, 5 pawns, 1 rook. Black is up 7 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00783", "split": "perception", "task_type": "square_lookup", "fen": "r2qk2r/ppp2pbp/2n1bnp1/4p3/Q1Pp4/P2B1N1P/1P3PP1/RNB2RK1 w kq - 0 11", "prompt": "FEN: r2qk2r/ppp2pbp/2n1bnp1/4p3/Q1Pp4/P2B1N1P/1P3PP1/RNB2RK1 w kq - 0 11\nWhat is on h8?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "h8=black rook", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "h8", "diagnostic": true, "hard_gate": false, "square": "h8"}} {"example_id": "perception_00784", "split": "perception", "task_type": "rank_lookup", "fen": "r4r2/pp4kp/5p2/3q1p2/3pp3/PP1P1B2/3Q1PPP/R3K2R w KQ - 0 22", "prompt": "FEN: r4r2/pp4kp/5p2/3q1p2/3pp3/PP1P1B2/3Q1PPP/R3K2R w KQ - 0 22\nWhat is the compressed FEN row for rank 8?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 8: r4r2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "8", "_rank_lookup_row": "r4r2", "diagnostic": true, "hard_gate": false, "rank": "8", "fen_rank_row": "r4r2"}} {"example_id": "perception_00785", "split": "perception", "task_type": "square_coordinates", "fen": "r3r1k1/ppp3p1/3p3p/3P1p2/1P6/P2PPK2/2P3PP/R6R w - - 0 18", "prompt": "FEN: r3r1k1/ppp3p1/3p3p/3P1p2/1P6/P2PPK2/2P3PP/R6R w - - 0 18\nFor square a8, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "a8: file=a; rank=8; fen_row_from_top=1; file_index=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "a8", "diagnostic": true, "hard_gate": false, "square": "a8"}} {"example_id": "perception_00786", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r1bq1rk1/p2pbpp1/2p2n1p/4p3/2B1P3/2N5/PPPB1PPP/R2QR1K1 b - - 1 10", "prompt": "FEN: r1bq1rk1/p2pbpp1/2p2n1p/4p3/2B1P3/2N5/PPPB1PPP/R2QR1K1 b - - 1 10\nCompressed rank 7 row: p2pbpp1\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 7: a=p; b=1; c=1; d=p; e=b; f=p; g=p; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "7", "_fen_rank_expansion_row": "p2pbpp1", "diagnostic": true, "hard_gate": false, "rank": "7", "fen_rank_row": "p2pbpp1"}} {"example_id": "perception_00787", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "1r1q1rk1/Q1p2pp1/3p1n1p/2b1pP2/2B5/2NP4/PP1B1PPP/n1K4R w - -", "prompt": "Rank 3 row before: 2NP4\nFile c changes from N to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 3: 2NP4 -> 3P4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "c3a4", "_fen_rank_cell_edit_square": "c3", "_fen_rank_cell_edit_rank": "3", "_fen_rank_cell_edit_file": "c", "_fen_rank_cell_edit_before_row": "2NP4", "_fen_rank_cell_edit_after_row": "3P4", "_fen_rank_cell_edit_before_fen": "N", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "c3a4", "square": "c3", "rank": "3", "file": "c", "before_row": "2NP4", "after_row": "3P4", "before_fen": "N", "after_fen": "1"}} {"example_id": "perception_00788", "split": "perception", "task_type": "fen_board_edit", "fen": "r3k2r/ppqn1pp1/2pbpnp1/6B1/3P4/2P2N2/PP2NPPP/R2QK2R w KQkq - 4 12", "prompt": "Board FEN before: r3k2r/ppqn1pp1/2pbpnp1/6B1/3P4/2P2N2/PP2NPPP/R2QK2R\nApply square edits: g5 B->1; c1 1->B\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: r3k2r/ppqn1pp1/2pbpnp1/8/3P4/2P2N2/PP2NPPP/R1BQK2R", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "g5c1", "_fen_board_edit_board_fen_before": "r3k2r/ppqn1pp1/2pbpnp1/6B1/3P4/2P2N2/PP2NPPP/R2QK2R", "_fen_board_edit_board_fen_after": "r3k2r/ppqn1pp1/2pbpnp1/8/3P4/2P2N2/PP2NPPP/R1BQK2R", "_fen_board_edit_edit_text": "g5 B->1; c1 1->B", "_fen_board_edit_changed_squares": [{"square": "g5", "before": "white bishop", "after": "empty", "before_fen": "B", "after_fen": "1"}, {"square": "c1", "before": "empty", "after": "white bishop", "before_fen": "1", "after_fen": "B"}], "diagnostic": true, "hard_gate": false, "move": "g5c1", "board_fen_before": "r3k2r/ppqn1pp1/2pbpnp1/6B1/3P4/2P2N2/PP2NPPP/R2QK2R", "board_fen_after": "r3k2r/ppqn1pp1/2pbpnp1/8/3P4/2P2N2/PP2NPPP/R1BQK2R", "edit_text": "g5 B->1; c1 1->B", "changed_squares": [{"square": "g5", "before": "white bishop", "after": "empty", "before_fen": "B", "after_fen": "1"}, {"square": "c1", "before": "empty", "after": "white bishop", "before_fen": "1", "after_fen": "B"}]}} {"example_id": "perception_00789", "split": "perception", "task_type": "move_square_edits", "fen": "6k1/4pp1p/1p1r2p1/6q1/1PPb4/5Q1P/P1R2PP1/3R2K1 b - -", "prompt": "Starting FEN: 6k1/4pp1p/1p1r2p1/6q1/1PPb4/5Q1P/P1R2PP1/3R2K1 b - -\nMove: g5e5\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: g5=black queen; e5=empty.\nSquares: g5 black queen->empty; e5 empty->black queen.\nRanks: rank 5 g q->1; rank 5 e 1->q.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "g5e5", "diagnostic": true, "hard_gate": false, "move": "g5e5"}} {"example_id": "perception_00790", "split": "perception", "task_type": "fen_assembly", "fen": "6k1/5ppp/6n1/2r5/p7/2N5/1PP2PPP/R2r3K w - - 0 26", "prompt": "Starting FEN: 6k1/5ppp/6n1/2r5/p7/2N5/1PP2PPP/R2r3K w - - 0 26\nMove: c3d1\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 26\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white knight c3d1. Captures black rook on d1.\nLookup: c3=white knight; d1=black rook.\nSquares: c3 white knight->empty; d1 black rook->white knight.\nRanks: rank 3 c N->1; rank 1 d r->N.\nResult FEN: 6k1/5ppp/6n1/2r5/p7/8/1PP2PPP/R2N3K b - - 0 26", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "c3d1", "diagnostic": true, "hard_gate": false, "move": "c3d1"}} {"example_id": "perception_00791", "split": "perception", "task_type": "fen_row_application", "fen": "2r3k1/6p1/P3pp2/3pN2p/R2n4/7P/5PP1/6K1 w - -", "prompt": "Starting FEN: 2r3k1/6p1/P3pp2/3pN2p/R2n4/7P/5PP1/6K1 w - - 0 1\nMove: a4a5\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 4 R2n4->3n4; rank 5 3pN2p->R2pN2p.\nResult FEN: 2r3k1/6p1/P3pp2/R2pN2p/3n4/7P/5PP1/6K1 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "a4a5", "_fen_row_application_rank_rewrites": [{"rank": "4", "before": "R2n4", "after": "3n4"}, {"rank": "5", "before": "3pN2p", "after": "R2pN2p"}], "diagnostic": true, "hard_gate": false, "move": "a4a5", "rank_rewrites": [{"rank": "4", "before": "R2n4", "after": "3n4"}, {"rank": "5", "before": "3pN2p", "after": "R2pN2p"}]}} {"example_id": "perception_00792", "split": "perception", "task_type": "state_tracking", "fen": "3r2k1/p3q1pp/8/3P4/3Q4/7P/PP4P1/5RK1 b - - 0 23", "prompt": "Starting FEN: 3r2k1/p3q1pp/8/3P4/3Q4/7P/PP4P1/5RK1 b - - 0 23\nAfter the moves e7e8, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 23\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 3rq1k1/p5pp/8/3P4/3Q4/7P/PP4P1/5RK1 w - - 1 24", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "e7e8", "_state_tracking_result": "3rq1k1/p5pp/8/3P4/3Q4/7P/PP4P1/5RK1 w - - 1 24"}} {"example_id": "perception_00793", "split": "perception", "task_type": "material_inventory", "fen": "1rr1b3/1p1nBpk1/3p2p1/p2Pp2p/P1B1P2P/2NR2P1/RP3PK1/8 b - -", "prompt": "FEN: 1rr1b3/1p1nBpk1/3p2p1/p2Pp2p/P1B1P2P/2NR2P1/RP3PK1/8 b - -\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g2; queen=none; rook=a2,d3; bishop=c4,e7; knight=c3; pawn=b2,f2,g3,a4,e4,h4,d5.\nBlack inventory: king=g7; queen=none; rook=b8,c8; bishop=e8; knight=d7; pawn=a5,e5,h5,d6,g6,b7,f7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00794", "split": "perception", "task_type": "material_piece_counts", "fen": "8/5k2/R6P/5P2/8/8/1r4K1/8 w - -", "prompt": "FEN: 8/5k2/R6P/5P2/8/8/1r4K1/8 w - -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=1; bishop=0; knight=0; pawn=2.\nBlack counts: king=1; queen=0; rook=1; bishop=0; knight=0; pawn=0.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00795", "split": "perception", "task_type": "material_value_totals", "fen": "2kr1b1r/ppp2ppp/2n5/3q4/8/2P1B3/PP2NPPP/R2QK2R b KQ -", "prompt": "FEN: 2kr1b1r/ppp2ppp/2n5/3q4/8/2P1B3/PP2NPPP/R2QK2R b KQ -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=3; knight=3; pawn=6; total=31.\nBlack values: king=0; queen=9; rook=10; bishop=3; knight=3; pawn=6; total=31.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00796", "split": "perception", "task_type": "material_balance_trace", "fen": "r2q3r/pbp2pk1/1p1p2p1/6b1/2P1PP1N/2NK2PQ/PP6/7R b - - 0 22", "prompt": "FEN: r2q3r/pbp2pk1/1p1p2p1/6b1/2P1PP1N/2NK2PQ/PP6/7R b - - 0 22\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=d3; queen=h3; rook=h1; bishop=none; knight=c3,h4; pawn=a2,b2,g3,c4,e4,f4 | black king=g7; queen=d8; rook=a8,h8; bishop=g5,b7; knight=none; pawn=b6,d6,g6,a7,c7,f7\nCounts: white king=1; queen=1; rook=1; bishop=0; knight=2; pawn=6 | black king=1; queen=1; rook=2; bishop=2; knight=0; pawn=6\nValues: white total=26; black total=31\nBalance: Black is up 5 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00797", "split": "perception", "task_type": "multi_state_tracking", "fen": "rnb1kb1r/2p2ppp/p2qpn2/1p6/8/1BNP1N2/PPP1QPPP/R1B1K2R b KQkq - 1 8", "prompt": "Starting FEN: rnb1kb1r/2p2ppp/p2qpn2/1p6/8/1BNP1N2/PPP1QPPP/R1B1K2R b KQkq - 1 8\nAfter the moves f6d7 d3d4, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 1\nFullmove number: 8\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rnb1kb1r/2pn1ppp/p2qp3/1p6/3P4/1BN2N2/PPP1QPPP/R1B1K2R b KQkq - 0 9", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "f6d7 d3d4", "_multi_state_tracking_result": "rnb1kb1r/2pn1ppp/p2qp3/1p6/3P4/1BN2N2/PPP1QPPP/R1B1K2R b KQkq - 0 9", "diagnostic": true, "hard_gate": false, "moves": "f6d7 d3d4"}} {"example_id": "perception_00798", "split": "perception", "task_type": "board_print", "fen": "8/pR2bk2/1p4pp/1P2Bp2/r4P1P/6K1/8/8 w - - 22 49", "prompt": "Position (FEN): 8/pR2bk2/1p4pp/1P2Bp2/r4P1P/6K1/8/8 w - - 22 49\nShow me the board.", "gold_answer": "8 . . . . . . . .\n7 p R . . b k . .\n6 . p . . . . p p\n5 . P . . B p . .\n4 r . . . . P . P\n3 . . . . . . K .\n2 . . . . . . . .\n1 . . . . . . . .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00799", "split": "perception", "task_type": "board_to_fen", "fen": "1rq1k1r1/1p2bp2/p2p4/2pPp1B1/2P3N1/P2P4/1P4P1/3QRRK1 b - - 0 26", "prompt": "Here is the current board:\n8 . r q . k . r .\n7 . p . . b p . .\n6 p . . p . . . .\n5 . . p P p . B .\n4 . . P . . . N .\n3 P . . P . . . .\n2 . P . . . . P .\n1 . . . Q R R K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 26\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "1rq1k1r1/1p2bp2/p2p4/2pPp1B1/2P3N1/P2P4/1P4P1/3QRRK1 b - - 0 26", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00800", "split": "perception", "task_type": "piece_id", "fen": "r1bqrnk1/pp2ppbp/2p2np1/3p4/2PP4/1P3NP1/PB1NPPBP/R2Q1RK1 w - - 3 10", "prompt": "FEN: r1bqrnk1/pp2ppbp/2p2np1/3p4/2PP4/1P3NP1/PB1NPPBP/R2Q1RK1 w - - 3 10\nWhat piece is on a2?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "a2"}} {"example_id": "perception_00801", "split": "perception", "task_type": "material_count", "fen": "5rk1/ppp2ppp/8/1P1r4/8/8/PP3PPK/2R1R3 w - - 0 22", "prompt": "FEN: 5rk1/ppp2ppp/8/1P1r4/8/8/PP3PPK/2R1R3 w - - 0 22\nWhat is the material count for both sides?", "gold_answer": "White (8 pieces): 1 king, 5 pawns, 2 rooks. Black (9 pieces): 1 king, 6 pawns, 2 rooks. Black is up 1 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00802", "split": "perception", "task_type": "square_lookup", "fen": "8/ppkb3p/4p3/5p2/3R3P/P1P1P3/1P6/3KB1r1 b - - 1 29", "prompt": "FEN: 8/ppkb3p/4p3/5p2/3R3P/P1P1P3/1P6/3KB1r1 b - - 1 29\nWhat is on c7?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "c7=black king", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "c7", "diagnostic": true, "hard_gate": false, "square": "c7"}} {"example_id": "perception_00803", "split": "perception", "task_type": "rank_lookup", "fen": "r1bqkb1r/ppp2ppp/2n2n2/3pp3/3P4/2P1P1P1/PP3PBP/RNBQK1NR b KQkq - 2 5", "prompt": "FEN: r1bqkb1r/ppp2ppp/2n2n2/3pp3/3P4/2P1P1P1/PP3PBP/RNBQK1NR b KQkq - 2 5\nWhat is the compressed FEN row for rank 8?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 8: r1bqkb1r", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "8", "_rank_lookup_row": "r1bqkb1r", "diagnostic": true, "hard_gate": false, "rank": "8", "fen_rank_row": "r1bqkb1r"}} {"example_id": "perception_00804", "split": "perception", "task_type": "square_coordinates", "fen": "r5kr/p2n1qBp/6p1/1p3b2/8/5Q2/PPP2PPP/4RRK1 b - - 0 22", "prompt": "FEN: r5kr/p2n1qBp/6p1/1p3b2/8/5Q2/PPP2PPP/4RRK1 b - - 0 22\nFor square c6, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "c6: file=c; rank=6; fen_row_from_top=3; file_index=3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "c6", "diagnostic": true, "hard_gate": false, "square": "c6"}} {"example_id": "perception_00805", "split": "perception", "task_type": "fen_rank_expansion", "fen": "3rkbnr/1p3ppp/p1n1P3/8/8/5P2/PP1N1PBP/R1BKR3 b k - 4 13", "prompt": "FEN: 3rkbnr/1p3ppp/p1n1P3/8/8/5P2/PP1N1PBP/R1BKR3 b k - 4 13\nCompressed rank 5 row: 8\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 5: a=1; b=1; c=1; d=1; e=1; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "5", "_fen_rank_expansion_row": "8", "diagnostic": true, "hard_gate": false, "rank": "5", "fen_rank_row": "8"}} {"example_id": "perception_00806", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "2kr3r/1pp2ppp/p3p3/3pPb2/q3nB2/1R4P1/P1P1PPBP/1N1Qb1K1 w - - 0 15", "prompt": "Rank 4 row before: q3nB2\nFile f changes from B to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 4: q3nB2 -> q3n3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "f4e3", "_fen_rank_cell_edit_square": "f4", "_fen_rank_cell_edit_rank": "4", "_fen_rank_cell_edit_file": "f", "_fen_rank_cell_edit_before_row": "q3nB2", "_fen_rank_cell_edit_after_row": "q3n3", "_fen_rank_cell_edit_before_fen": "B", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "f4e3", "square": "f4", "rank": "4", "file": "f", "before_row": "q3nB2", "after_row": "q3n3", "before_fen": "B", "after_fen": "1"}} {"example_id": "perception_00807", "split": "perception", "task_type": "fen_board_edit", "fen": "rnbqkb1r/ppp2ppp/4p3/8/4n3/3P1N2/PPP2PPP/R1BQKB1R w KQkq - 0 6", "prompt": "Board FEN before: rnbqkb1r/ppp2ppp/4p3/8/4n3/3P1N2/PPP2PPP/R1BQKB1R\nApply square edits: d1 Q->1; e2 1->Q\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: rnbqkb1r/ppp2ppp/4p3/8/4n3/3P1N2/PPP1QPPP/R1B1KB1R", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "d1e2", "_fen_board_edit_board_fen_before": "rnbqkb1r/ppp2ppp/4p3/8/4n3/3P1N2/PPP2PPP/R1BQKB1R", "_fen_board_edit_board_fen_after": "rnbqkb1r/ppp2ppp/4p3/8/4n3/3P1N2/PPP1QPPP/R1B1KB1R", "_fen_board_edit_edit_text": "d1 Q->1; e2 1->Q", "_fen_board_edit_changed_squares": [{"square": "d1", "before": "white queen", "after": "empty", "before_fen": "Q", "after_fen": "1"}, {"square": "e2", "before": "empty", "after": "white queen", "before_fen": "1", "after_fen": "Q"}], "diagnostic": true, "hard_gate": false, "move": "d1e2", "board_fen_before": "rnbqkb1r/ppp2ppp/4p3/8/4n3/3P1N2/PPP2PPP/R1BQKB1R", "board_fen_after": "rnbqkb1r/ppp2ppp/4p3/8/4n3/3P1N2/PPP1QPPP/R1B1KB1R", "edit_text": "d1 Q->1; e2 1->Q", "changed_squares": [{"square": "d1", "before": "white queen", "after": "empty", "before_fen": "Q", "after_fen": "1"}, {"square": "e2", "before": "empty", "after": "white queen", "before_fen": "1", "after_fen": "Q"}]}} {"example_id": "perception_00808", "split": "perception", "task_type": "move_square_edits", "fen": "3r2k1/pb3ppp/1n6/1PK1p3/8/2P5/P6P/5R2 w - - 0 30", "prompt": "Starting FEN: 3r2k1/pb3ppp/1n6/1PK1p3/8/2P5/P6P/5R2 w - - 0 30\nMove: f1e1\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: f1=white rook; e1=empty.\nSquares: f1 white rook->empty; e1 empty->white rook.\nRanks: rank 1 f R->1; rank 1 e 1->R.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "f1e1", "diagnostic": true, "hard_gate": false, "move": "f1e1"}} {"example_id": "perception_00809", "split": "perception", "task_type": "fen_assembly", "fen": "5r2/ppp3k1/3pB1p1/3Pp2p/3rP3/1KP4P/P1P5/R6R b - - 0 30", "prompt": "Starting FEN: 5r2/ppp3k1/3pB1p1/3Pp2p/3rP3/1KP4P/P1P5/R6R b - - 0 30\nMove: g6g5\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 30\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black pawn g6g5.\nLookup: g6=black pawn; g5=empty.\nSquares: g6 black pawn->empty; g5 empty->black pawn.\nRanks: rank 6 g p->1; rank 5 g 1->p.\nResult FEN: 5r2/ppp3k1/3pB3/3Pp1pp/3rP3/1KP4P/P1P5/R6R w - - 0 31", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "g6g5", "diagnostic": true, "hard_gate": false, "move": "g6g5"}} {"example_id": "perception_00810", "split": "perception", "task_type": "fen_row_application", "fen": "1n5k/4r1b1/1p1NB1pp/2p5/8/P1P2NP1/5P1P/2Bb2K1 w - -", "prompt": "Starting FEN: 1n5k/4r1b1/1p1NB1pp/2p5/8/P1P2NP1/5P1P/2Bb2K1 w - - 0 1\nMove: e6f5\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 6 1p1NB1pp->1p1N2pp; rank 5 2p5->2p2B2.\nResult FEN: 1n5k/4r1b1/1p1N2pp/2p2B2/8/P1P2NP1/5P1P/2Bb2K1 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "e6f5", "_fen_row_application_rank_rewrites": [{"rank": "6", "before": "1p1NB1pp", "after": "1p1N2pp"}, {"rank": "5", "before": "2p5", "after": "2p2B2"}], "diagnostic": true, "hard_gate": false, "move": "e6f5", "rank_rewrites": [{"rank": "6", "before": "1p1NB1pp", "after": "1p1N2pp"}, {"rank": "5", "before": "2p5", "after": "2p2B2"}]}} {"example_id": "perception_00811", "split": "perception", "task_type": "state_tracking", "fen": "8/1p6/8/1P3pk1/2P5/4PR1P/1r6/7K b - - 0 45", "prompt": "Starting FEN: 8/1p6/8/1P3pk1/2P5/4PR1P/1r6/7K b - - 0 45\nAfter the moves b2h2, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 45\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 8/1p6/8/1P3pk1/2P5/4PR1P/7r/7K w - - 1 46", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "b2h2", "_state_tracking_result": "8/1p6/8/1P3pk1/2P5/4PR1P/7r/7K w - - 1 46"}} {"example_id": "perception_00812", "split": "perception", "task_type": "material_inventory", "fen": "1k2r3/ppp3pp/1bn5/8/2P1N3/2P1p2P/P4rP1/R1B1K2R w - - 2 25", "prompt": "FEN: 1k2r3/ppp3pp/1bn5/8/2P1N3/2P1p2P/P4rP1/R1B1K2R w - - 2 25\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=e1; queen=none; rook=a1,h1; bishop=c1; knight=e4; pawn=a2,g2,c3,h3,c4.\nBlack inventory: king=b8; queen=none; rook=f2,e8; bishop=b6; knight=c6; pawn=e3,a7,b7,c7,g7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00813", "split": "perception", "task_type": "material_piece_counts", "fen": "1b6/4k3/5n2/8/4K3/8/8/8 w - - 16 48", "prompt": "FEN: 1b6/4k3/5n2/8/4K3/8/8/8 w - - 16 48\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=0; bishop=0; knight=0; pawn=0.\nBlack counts: king=1; queen=0; rook=0; bishop=1; knight=1; pawn=0.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00814", "split": "perception", "task_type": "material_value_totals", "fen": "3r2k1/4Q2p/p4Rp1/1ppq4/P7/1P5P/6P1/7K w - -", "prompt": "FEN: 3r2k1/4Q2p/p4Rp1/1ppq4/P7/1P5P/6P1/7K w - -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=5; bishop=0; knight=0; pawn=4; total=18.\nBlack values: king=0; queen=9; rook=5; bishop=0; knight=0; pawn=5; total=19.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00815", "split": "perception", "task_type": "material_balance_trace", "fen": "rb3rk1/2p2p1p/2Pp1qb1/p1n1pNp1/Q1N1P1B1/2P1B1P1/5P1K/R4R2 w - - 4 26", "prompt": "FEN: rb3rk1/2p2p1p/2Pp1qb1/p1n1pNp1/Q1N1P1B1/2P1B1P1/5P1K/R4R2 w - - 4 26\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=h2; queen=a4; rook=a1,f1; bishop=e3,g4; knight=c4,f5; pawn=f2,c3,g3,e4,c6 | black king=g8; queen=f6; rook=a8,f8; bishop=g6,b8; knight=c5; pawn=a5,e5,g5,d6,c7,f7,h7\nCounts: white king=1; queen=1; rook=2; bishop=2; knight=2; pawn=5 | black king=1; queen=1; rook=2; bishop=2; knight=1; pawn=7\nValues: white total=36; black total=35\nBalance: White is up 1 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00816", "split": "perception", "task_type": "multi_state_tracking", "fen": "rn3bnr/p2k2pp/1p1p2p1/6B1/3N4/8/PPN2PPP/R2QR1K1 w - - 0 14", "prompt": "Starting FEN: rn3bnr/p2k2pp/1p1p2p1/6B1/3N4/8/PPN2PPP/R2QR1K1 w - - 0 14\nAfter the moves e1e2 g8h6, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 14\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rn3b1r/p2k2pp/1p1p2pn/6B1/3N4/8/PPN1RPPP/R2Q2K1 w - - 2 15", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "e1e2 g8h6", "_multi_state_tracking_result": "rn3b1r/p2k2pp/1p1p2pn/6B1/3N4/8/PPN1RPPP/R2Q2K1 w - - 2 15", "diagnostic": true, "hard_gate": false, "moves": "e1e2 g8h6"}} {"example_id": "perception_00817", "split": "perception", "task_type": "board_print", "fen": "rn2kb1r/pbpp4/1p2pq2/7p/3PN3/3B1N2/PPP2PPP/R2Q1RK1 b kq - 1 11", "prompt": "Position (FEN): rn2kb1r/pbpp4/1p2pq2/7p/3PN3/3B1N2/PPP2PPP/R2Q1RK1 b kq - 1 11\nShow me the board.", "gold_answer": "8 r n . . k b . r\n7 p b p p . . . .\n6 . p . . p q . .\n5 . . . . . . . p\n4 . . . P N . . .\n3 . . . B . N . .\n2 P P P . . P P P\n1 R . . Q . R K .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00818", "split": "perception", "task_type": "board_to_fen", "fen": "8/4kp2/7P/4KP2/8/1p6/8/8 b - - 0 51", "prompt": "Here is the current board:\n8 . . . . . . . .\n7 . . . . k p . .\n6 . . . . . . . P\n5 . . . . K P . .\n4 . . . . . . . .\n3 . p . . . . . .\n2 . . . . . . . .\n1 . . . . . . . .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 51\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "8/4kp2/7P/4KP2/8/1p6/8/8 b - - 0 51", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00819", "split": "perception", "task_type": "piece_id", "fen": "5k2/2p4p/6p1/R7/3P1P2/1P4P1/P6P/2K1r3 w - - 1 42", "prompt": "FEN: 5k2/2p4p/6p1/R7/3P1P2/1P4P1/P6P/2K1r3 w - - 1 42\nWhat piece is on a5?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white rook", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "a5"}} {"example_id": "perception_00820", "split": "perception", "task_type": "material_count", "fen": "r2qN2k/pppb2p1/2np3p/8/2Q5/8/PP1N1PPP/R3R1K1 w - -", "prompt": "FEN: r2qN2k/pppb2p1/2np3p/8/2Q5/8/PP1N1PPP/R3R1K1 w - -\nWhat is the material count for both sides?", "gold_answer": "White (11 pieces): 1 king, 2 knights, 5 pawns, 1 queen, 2 rooks. Black (11 pieces): 1 bishop, 1 king, 1 knight, 6 pawns, 1 queen, 1 rook. White is up 4 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00821", "split": "perception", "task_type": "square_lookup", "fen": "6k1/1p4pp/8/p1R5/6P1/7P/PP4K1/3r4 b - -", "prompt": "FEN: 6k1/1p4pp/8/p1R5/6P1/7P/PP4K1/3r4 b - -\nWhat is on b2?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "b2=white pawn", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "b2", "diagnostic": true, "hard_gate": false, "square": "b2"}} {"example_id": "perception_00822", "split": "perception", "task_type": "rank_lookup", "fen": "3q1b2/pkp1n3/1p5p/7p/4Q3/8/PB3PPP/4R1K1 b - - 1 24", "prompt": "FEN: 3q1b2/pkp1n3/1p5p/7p/4Q3/8/PB3PPP/4R1K1 b - - 1 24\nWhat is the compressed FEN row for rank 5?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 5: 7p", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "5", "_rank_lookup_row": "7p", "diagnostic": true, "hard_gate": false, "rank": "5", "fen_rank_row": "7p"}} {"example_id": "perception_00823", "split": "perception", "task_type": "square_coordinates", "fen": "r3kbqr/pppn3p/3pp3/4PnB1/3PN1QP/3B4/PPP3P1/R3KR2 w Qkq -", "prompt": "FEN: r3kbqr/pppn3p/3pp3/4PnB1/3PN1QP/3B4/PPP3P1/R3KR2 w Qkq -\nFor square h1, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "h1: file=h; rank=1; fen_row_from_top=8; file_index=8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "h1", "diagnostic": true, "hard_gate": false, "square": "h1"}} {"example_id": "perception_00824", "split": "perception", "task_type": "fen_rank_expansion", "fen": "5rk1/rp3ppp/2p5/p2n4/8/2P2PN1/PP3P1P/R3R1K1 w - -", "prompt": "FEN: 5rk1/rp3ppp/2p5/p2n4/8/2P2PN1/PP3P1P/R3R1K1 w - -\nCompressed rank 1 row: R3R1K1\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 1: a=R; b=1; c=1; d=1; e=R; f=1; g=K; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "1", "_fen_rank_expansion_row": "R3R1K1", "diagnostic": true, "hard_gate": false, "rank": "1", "fen_rank_row": "R3R1K1"}} {"example_id": "perception_00825", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "6r1/ppkb3p/4p3/5p2/3R3P/P1P1P3/1P6/2K1B1R1 b - - 0 28", "prompt": "Rank 4 row before: 3R3P\nFile g changes from 1 to r. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 4: 3R3P -> 3R2rP", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "g8g4", "_fen_rank_cell_edit_square": "g4", "_fen_rank_cell_edit_rank": "4", "_fen_rank_cell_edit_file": "g", "_fen_rank_cell_edit_before_row": "3R3P", "_fen_rank_cell_edit_after_row": "3R2rP", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "r", "diagnostic": true, "hard_gate": false, "move": "g8g4", "square": "g4", "rank": "4", "file": "g", "before_row": "3R3P", "after_row": "3R2rP", "before_fen": "1", "after_fen": "r"}} {"example_id": "perception_00826", "split": "perception", "task_type": "fen_board_edit", "fen": "rn3rk1/pbp2p1p/1p1qpBp1/4N3/2PP4/P2Q4/1P3PPP/R4RK1 w - - 1 16", "prompt": "Board FEN before: rn3rk1/pbp2p1p/1p1qpBp1/4N3/2PP4/P2Q4/1P3PPP/R4RK1\nApply square edits: a3 P->1; a4 1->P\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: rn3rk1/pbp2p1p/1p1qpBp1/4N3/P1PP4/3Q4/1P3PPP/R4RK1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "a3a4", "_fen_board_edit_board_fen_before": "rn3rk1/pbp2p1p/1p1qpBp1/4N3/2PP4/P2Q4/1P3PPP/R4RK1", "_fen_board_edit_board_fen_after": "rn3rk1/pbp2p1p/1p1qpBp1/4N3/P1PP4/3Q4/1P3PPP/R4RK1", "_fen_board_edit_edit_text": "a3 P->1; a4 1->P", "_fen_board_edit_changed_squares": [{"square": "a3", "before": "white pawn", "after": "empty", "before_fen": "P", "after_fen": "1"}, {"square": "a4", "before": "empty", "after": "white pawn", "before_fen": "1", "after_fen": "P"}], "diagnostic": true, "hard_gate": false, "move": "a3a4", "board_fen_before": "rn3rk1/pbp2p1p/1p1qpBp1/4N3/2PP4/P2Q4/1P3PPP/R4RK1", "board_fen_after": "rn3rk1/pbp2p1p/1p1qpBp1/4N3/P1PP4/3Q4/1P3PPP/R4RK1", "edit_text": "a3 P->1; a4 1->P", "changed_squares": [{"square": "a3", "before": "white pawn", "after": "empty", "before_fen": "P", "after_fen": "1"}, {"square": "a4", "before": "empty", "after": "white pawn", "before_fen": "1", "after_fen": "P"}]}} {"example_id": "perception_00827", "split": "perception", "task_type": "move_square_edits", "fen": "rnbqk2r/pppp1ppp/6n1/2b5/2P1PP2/2N2N2/PP4PP/R1BQKB1R b KQkq -", "prompt": "Starting FEN: rnbqk2r/pppp1ppp/6n1/2b5/2P1PP2/2N2N2/PP4PP/R1BQKB1R b KQkq -\nMove: a7a5\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: a7=black pawn; a5=empty.\nSquares: a7 black pawn->empty; a5 empty->black pawn.\nRanks: rank 7 a p->1; rank 5 a 1->p.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "a7a5", "diagnostic": true, "hard_gate": false, "move": "a7a5"}} {"example_id": "perception_00828", "split": "perception", "task_type": "fen_assembly", "fen": "3r4/p3R1kp/6p1/1p1p1r2/5q2/2PQ3P/PPB2P2/5K2 b - - 5 27", "prompt": "Starting FEN: 3r4/p3R1kp/6p1/1p1p1r2/5q2/2PQ3P/PPB2P2/5K2 b - - 5 27\nMove: g7f8\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 5\nFullmove number: 27\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black king g7f8.\nLookup: g7=black king; f8=empty.\nSquares: g7 black king->empty; f8 empty->black king.\nRanks: rank 7 g k->1; rank 8 f 1->k.\nResult FEN: 3r1k2/p3R2p/6p1/1p1p1r2/5q2/2PQ3P/PPB2P2/5K2 w - - 6 28", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "g7f8", "diagnostic": true, "hard_gate": false, "move": "g7f8"}} {"example_id": "perception_00829", "split": "perception", "task_type": "fen_row_application", "fen": "4r1k1/pp1n1ppp/2pQ4/8/8/2N4P/PP3PP1/6K1 b - - 0 22", "prompt": "Starting FEN: 4r1k1/pp1n1ppp/2pQ4/8/8/2N4P/PP3PP1/6K1 b - - 0 22\nMove: d7b8\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 22\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 7 pp1n1ppp->pp3ppp; rank 8 4r1k1->1n2r1k1.\nResult FEN: 1n2r1k1/pp3ppp/2pQ4/8/8/2N4P/PP3PP1/6K1 w - - 1 23", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "d7b8", "_fen_row_application_rank_rewrites": [{"rank": "7", "before": "pp1n1ppp", "after": "pp3ppp"}, {"rank": "8", "before": "4r1k1", "after": "1n2r1k1"}], "diagnostic": true, "hard_gate": false, "move": "d7b8", "rank_rewrites": [{"rank": "7", "before": "pp1n1ppp", "after": "pp3ppp"}, {"rank": "8", "before": "4r1k1", "after": "1n2r1k1"}]}} {"example_id": "perception_00830", "split": "perception", "task_type": "state_tracking", "fen": "R7/5ppk/4p3/p1r1P2p/1p3P2/1P4PP/6K1/8 w - -", "prompt": "Starting FEN: R7/5ppk/4p3/p1r1P2p/1p3P2/1P4PP/6K1/8 w - - 0 1\nAfter the moves g2g1, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: R7/5ppk/4p3/p1r1P2p/1p3P2/1P4PP/8/6K1 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "g2g1", "_state_tracking_result": "R7/5ppk/4p3/p1r1P2p/1p3P2/1P4PP/8/6K1 b - - 1 1"}} {"example_id": "perception_00831", "split": "perception", "task_type": "material_inventory", "fen": "r1bqnrk1/p1ppbppp/2p5/4P3/8/P1N1B3/1PP2PPP/R2QKB1R b KQ -", "prompt": "FEN: r1bqnrk1/p1ppbppp/2p5/4P3/8/P1N1B3/1PP2PPP/R2QKB1R b KQ -\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=e1; queen=d1; rook=a1,h1; bishop=f1,e3; knight=c3; pawn=b2,c2,f2,g2,h2,a3,e5.\nBlack inventory: king=g8; queen=d8; rook=a8,f8; bishop=e7,c8; knight=e8; pawn=c6,a7,c7,d7,f7,g7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00832", "split": "perception", "task_type": "material_piece_counts", "fen": "6k1/5p2/2r1p1p1/3p1n2/p2P3p/1P5P/P2qNPP1/3R2K1 w - -", "prompt": "FEN: 6k1/5p2/2r1p1p1/3p1n2/p2P3p/1P5P/P2qNPP1/3R2K1 w - -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=1; bishop=0; knight=1; pawn=6.\nBlack counts: king=1; queen=1; rook=1; bishop=0; knight=1; pawn=6.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00833", "split": "perception", "task_type": "material_value_totals", "fen": "2r1k2r/1p1nqpp1/p2p2bp/1P2p3/4P1P1/3PBN1P/1P3PK1/R2Q1R2 b k - 0 18", "prompt": "FEN: 2r1k2r/1p1nqpp1/p2p2bp/1P2p3/4P1P1/3PBN1P/1P3PK1/R2Q1R2 b k - 0 18\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=3; knight=3; pawn=7; total=32.\nBlack values: king=0; queen=9; rook=10; bishop=3; knight=3; pawn=7; total=32.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00834", "split": "perception", "task_type": "material_balance_trace", "fen": "rn1qkbnr/pppb2pp/4p3/3p1p2/3P1PP1/2N4P/PPPQP3/R1B1KBNR b KQkq -", "prompt": "FEN: rn1qkbnr/pppb2pp/4p3/3p1p2/3P1PP1/2N4P/PPPQP3/R1B1KBNR b KQkq -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=e1; queen=d2; rook=a1,h1; bishop=c1,f1; knight=g1,c3; pawn=a2,b2,c2,e2,h3,d4,f4,g4 | black king=e8; queen=d8; rook=a8,h8; bishop=d7,f8; knight=b8,g8; pawn=d5,f5,e6,a7,b7,c7,g7,h7\nCounts: white king=1; queen=1; rook=2; bishop=2; knight=2; pawn=8 | black king=1; queen=1; rook=2; bishop=2; knight=2; pawn=8\nValues: white total=39; black total=39\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00835", "split": "perception", "task_type": "multi_state_tracking", "fen": "rn1qkb1r/2pb1pp1/1p1p1n1p/pP2p3/P1B1P3/2PP1N1P/5PP1/RNBQK2R w KQkq - 1 10", "prompt": "Starting FEN: rn1qkb1r/2pb1pp1/1p1p1n1p/pP2p3/P1B1P3/2PP1N1P/5PP1/RNBQK2R w KQkq - 1 10\nAfter the moves c1e3 a8a7 b1d2, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 1\nFullmove number: 10\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 1n1qkb1r/r1pb1pp1/1p1p1n1p/pP2p3/P1B1P3/2PPBN1P/3N1PP1/R2QK2R b KQk - 4 11", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "c1e3 a8a7 b1d2", "_multi_state_tracking_result": "1n1qkb1r/r1pb1pp1/1p1p1n1p/pP2p3/P1B1P3/2PPBN1P/3N1PP1/R2QK2R b KQk - 4 11", "diagnostic": true, "hard_gate": false, "moves": "c1e3 a8a7 b1d2"}} {"example_id": "perception_00836", "split": "perception", "task_type": "board_print", "fen": "8/8/8/2R5/1K1k4/8/8/8 b - -", "prompt": "Position (FEN): 8/8/8/2R5/1K1k4/8/8/8 b - -\nShow me the board.", "gold_answer": "8 . . . . . . . .\n7 . . . . . . . .\n6 . . . . . . . .\n5 . . R . . . . .\n4 . K . k . . . .\n3 . . . . . . . .\n2 . . . . . . . .\n1 . . . . . . . .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00837", "split": "perception", "task_type": "board_to_fen", "fen": "8/1p4p1/1kp2b2/p7/7P/6rK/8/8 w - - 0 43", "prompt": "Here is the current board:\n8 . . . . . . . .\n7 . p . . . . p .\n6 . k p . . b . .\n5 p . . . . . . .\n4 . . . . . . . P\n3 . . . . . . r K\n2 . . . . . . . .\n1 . . . . . . . .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 43\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "8/1p4p1/1kp2b2/p7/7P/6rK/8/8 w - - 0 43", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00838", "split": "perception", "task_type": "piece_id", "fen": "2r2rk1/1p2qpp1/p3p2p/1b1n4/P3N3/1P2PN2/3Q1PPP/R1R3K1 b - - 0 19", "prompt": "FEN: 2r2rk1/1p2qpp1/p3p2p/1b1n4/P3N3/1P2PN2/3Q1PPP/R1R3K1 b - - 0 19\nWhat piece is on b7?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "b7"}} {"example_id": "perception_00839", "split": "perception", "task_type": "material_count", "fen": "5k2/8/4KP2/8/p7/P7/1P6/8 b - -", "prompt": "FEN: 5k2/8/4KP2/8/p7/P7/1P6/8 b - -\nWhat is the material count for both sides?", "gold_answer": "White (4 pieces): 1 king, 3 pawns. Black (2 pieces): 1 king, 1 pawn. White is up 2 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00840", "split": "perception", "task_type": "square_lookup", "fen": "r5r1/p1p1k2p/1p1pP3/4n1q1/1P4n1/P1P5/1B1NQPb1/R3R1K1 w - - 0 25", "prompt": "FEN: r5r1/p1p1k2p/1p1pP3/4n1q1/1P4n1/P1P5/1B1NQPb1/R3R1K1 w - - 0 25\nWhat is on g1?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "g1=white king", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "g1", "diagnostic": true, "hard_gate": false, "square": "g1"}} {"example_id": "perception_00841", "split": "perception", "task_type": "rank_lookup", "fen": "r3k2r/3bqppp/4pn2/3p4/pn1P4/1BQ2N2/2P1NPPP/2KR3R w kq - 0 19", "prompt": "FEN: r3k2r/3bqppp/4pn2/3p4/pn1P4/1BQ2N2/2P1NPPP/2KR3R w kq - 0 19\nWhat is the compressed FEN row for rank 1?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 1: 2KR3R", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "1", "_rank_lookup_row": "2KR3R", "diagnostic": true, "hard_gate": false, "rank": "1", "fen_rank_row": "2KR3R"}} {"example_id": "perception_00842", "split": "perception", "task_type": "square_coordinates", "fen": "r1bk3r/2p2pb1/2n2p1p/p3p3/1pPP4/1P3N2/2N2PPP/R1B2RK1 b - - 0 17", "prompt": "FEN: r1bk3r/2p2pb1/2n2p1p/p3p3/1pPP4/1P3N2/2N2PPP/R1B2RK1 b - - 0 17\nFor square c5, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "c5: file=c; rank=5; fen_row_from_top=4; file_index=3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "c5", "diagnostic": true, "hard_gate": false, "square": "c5"}} {"example_id": "perception_00843", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r6r/3b1pk1/1p1p2p1/2n1p2P/p1P1PqP1/P1N5/1P2B1Q1/1K1R3R b - -", "prompt": "FEN: r6r/3b1pk1/1p1p2p1/2n1p2P/p1P1PqP1/P1N5/1P2B1Q1/1K1R3R b - -\nCompressed rank 5 row: 2n1p2P\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 5: a=1; b=1; c=n; d=1; e=p; f=1; g=1; h=P", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "5", "_fen_rank_expansion_row": "2n1p2P", "diagnostic": true, "hard_gate": false, "rank": "5", "fen_rank_row": "2n1p2P"}} {"example_id": "perception_00844", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r1b1kbnr/p2p1ppp/pq1P4/8/8/p1P2N2/5PPP/RNBQK2R w KQkq -", "prompt": "Rank 3 row before: p1P2N2\nFile f changes from N to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 3: p1P2N2 -> p1P5", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "f3e5", "_fen_rank_cell_edit_square": "f3", "_fen_rank_cell_edit_rank": "3", "_fen_rank_cell_edit_file": "f", "_fen_rank_cell_edit_before_row": "p1P2N2", "_fen_rank_cell_edit_after_row": "p1P5", "_fen_rank_cell_edit_before_fen": "N", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "f3e5", "square": "f3", "rank": "3", "file": "f", "before_row": "p1P2N2", "after_row": "p1P5", "before_fen": "N", "after_fen": "1"}} {"example_id": "perception_00845", "split": "perception", "task_type": "fen_board_edit", "fen": "8/8/4K3/2R5/n7/8/8/4k3 w - -", "prompt": "Board FEN before: 8/8/4K3/2R5/n7/8/8/4k3\nApply square edits: e6 K->1; d5 1->K\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 8/8/8/2RK4/n7/8/8/4k3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "e6d5", "_fen_board_edit_board_fen_before": "8/8/4K3/2R5/n7/8/8/4k3", "_fen_board_edit_board_fen_after": "8/8/8/2RK4/n7/8/8/4k3", "_fen_board_edit_edit_text": "e6 K->1; d5 1->K", "_fen_board_edit_changed_squares": [{"square": "e6", "before": "white king", "after": "empty", "before_fen": "K", "after_fen": "1"}, {"square": "d5", "before": "empty", "after": "white king", "before_fen": "1", "after_fen": "K"}], "diagnostic": true, "hard_gate": false, "move": "e6d5", "board_fen_before": "8/8/4K3/2R5/n7/8/8/4k3", "board_fen_after": "8/8/8/2RK4/n7/8/8/4k3", "edit_text": "e6 K->1; d5 1->K", "changed_squares": [{"square": "e6", "before": "white king", "after": "empty", "before_fen": "K", "after_fen": "1"}, {"square": "d5", "before": "empty", "after": "white king", "before_fen": "1", "after_fen": "K"}]}} {"example_id": "perception_00846", "split": "perception", "task_type": "move_square_edits", "fen": "r1bqkb1r/ppp2ppp/2n1p3/3pP3/3Pn3/2PB4/PP1N1PPP/R1BQK1NR b KQkq - 1 6", "prompt": "Starting FEN: r1bqkb1r/ppp2ppp/2n1p3/3pP3/3Pn3/2PB4/PP1N1PPP/R1BQK1NR b KQkq - 1 6\nMove: g7g5\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: g7=black pawn; g5=empty.\nSquares: g7 black pawn->empty; g5 empty->black pawn.\nRanks: rank 7 g p->1; rank 5 g 1->p.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "g7g5", "diagnostic": true, "hard_gate": false, "move": "g7g5"}} {"example_id": "perception_00847", "split": "perception", "task_type": "fen_assembly", "fen": "r3r1k1/ppp2ppp/2nq4/2b5/4p3/2BP2PP/PP2PPB1/R2Q1RK1 b - -", "prompt": "Starting FEN: r3r1k1/ppp2ppp/2nq4/2b5/4p3/2BP2PP/PP2PPB1/R2Q1RK1 b - - 0 1\nMove: c5a3\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black bishop c5a3.\nLookup: c5=black bishop; a3=empty.\nSquares: c5 black bishop->empty; a3 empty->black bishop.\nRanks: rank 5 c b->1; rank 3 a 1->b.\nResult FEN: r3r1k1/ppp2ppp/2nq4/8/4p3/b1BP2PP/PP2PPB1/R2Q1RK1 w - - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "c5a3", "diagnostic": true, "hard_gate": false, "move": "c5a3"}} {"example_id": "perception_00848", "split": "perception", "task_type": "fen_row_application", "fen": "8/8/8/6p1/4K1P1/6k1/8/8 w - -", "prompt": "Starting FEN: 8/8/8/6p1/4K1P1/6k1/8/8 w - - 0 1\nMove: e4f5\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 4 4K1P1->6P1; rank 5 6p1->5Kp1.\nResult FEN: 8/8/8/5Kp1/6P1/6k1/8/8 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "e4f5", "_fen_row_application_rank_rewrites": [{"rank": "4", "before": "4K1P1", "after": "6P1"}, {"rank": "5", "before": "6p1", "after": "5Kp1"}], "diagnostic": true, "hard_gate": false, "move": "e4f5", "rank_rewrites": [{"rank": "4", "before": "4K1P1", "after": "6P1"}, {"rank": "5", "before": "6p1", "after": "5Kp1"}]}} {"example_id": "perception_00849", "split": "perception", "task_type": "state_tracking", "fen": "r4rk1/p3b2p/2p1p2p/3qN3/3P4/2P3Q1/P4PPP/R4RK1 b - - 2 21", "prompt": "Starting FEN: r4rk1/p3b2p/2p1p2p/3qN3/3P4/2P3Q1/P4PPP/R4RK1 b - - 2 21\nAfter the moves g8h8, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 2\nFullmove number: 21\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r4r1k/p3b2p/2p1p2p/3qN3/3P4/2P3Q1/P4PPP/R4RK1 w - - 3 22", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "g8h8", "_state_tracking_result": "r4r1k/p3b2p/2p1p2p/3qN3/3P4/2P3Q1/P4PPP/R4RK1 w - - 3 22"}} {"example_id": "perception_00850", "split": "perception", "task_type": "material_inventory", "fen": "r5k1/ppPr2pp/2nB1pn1/5P2/1N6/1KP3P1/PP1Rb2P/8 b - - 0 22", "prompt": "FEN: r5k1/ppPr2pp/2nB1pn1/5P2/1N6/1KP3P1/PP1Rb2P/8 b - - 0 22\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=b3; queen=none; rook=d2; bishop=d6; knight=b4; pawn=a2,b2,h2,c3,g3,f5,c7.\nBlack inventory: king=g8; queen=none; rook=d7,a8; bishop=e2; knight=c6,g6; pawn=f6,a7,b7,g7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00851", "split": "perception", "task_type": "material_piece_counts", "fen": "2r1kr2/ppQ5/3p1pp1/4n3/4PP2/1P6/1PP3P1/1K1R1B1R b - - 0 23", "prompt": "FEN: 2r1kr2/ppQ5/3p1pp1/4n3/4PP2/1P6/1PP3P1/1K1R1B1R b - - 0 23\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=1; knight=0; pawn=6.\nBlack counts: king=1; queen=0; rook=2; bishop=0; knight=1; pawn=5.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00852", "split": "perception", "task_type": "material_value_totals", "fen": "r2qkb1r/pb1nnppp/1pp1p3/3pP3/3P4/2PBBN2/PPQ2PPP/RN2K2R b KQkq - 3 8", "prompt": "FEN: r2qkb1r/pb1nnppp/1pp1p3/3pP3/3P4/2PBBN2/PPQ2PPP/RN2K2R b KQkq - 3 8\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=8; total=39.\nBlack values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=8; total=39.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00853", "split": "perception", "task_type": "material_balance_trace", "fen": "8/8/4B1k1/8/5K2/3N4/8/8 w - -", "prompt": "FEN: 8/8/4B1k1/8/5K2/3N4/8/8 w - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=f4; queen=none; rook=none; bishop=e6; knight=d3; pawn=none | black king=g6; queen=none; rook=none; bishop=none; knight=none; pawn=none\nCounts: white king=1; queen=0; rook=0; bishop=1; knight=1; pawn=0 | black king=1; queen=0; rook=0; bishop=0; knight=0; pawn=0\nValues: white total=6; black total=0\nBalance: White is up 6 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00854", "split": "perception", "task_type": "multi_state_tracking", "fen": "r3r1k1/3q1pp1/p3b2p/np1p4/2pP4/P1P3NP/BP1Q1PP1/3RR1K1 w - - 0 22", "prompt": "Starting FEN: r3r1k1/3q1pp1/p3b2p/np1p4/2pP4/P1P3NP/BP1Q1PP1/3RR1K1 w - - 0 22\nAfter the moves a3a4 f7f6, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 22\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r3r1k1/3q2p1/p3bp1p/np1p4/P1pP4/2P3NP/BP1Q1PP1/3RR1K1 w - - 0 23", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "a3a4 f7f6", "_multi_state_tracking_result": "r3r1k1/3q2p1/p3bp1p/np1p4/P1pP4/2P3NP/BP1Q1PP1/3RR1K1 w - - 0 23", "diagnostic": true, "hard_gate": false, "moves": "a3a4 f7f6"}} {"example_id": "perception_00855", "split": "perception", "task_type": "board_print", "fen": "4r2r/p1pk4/1p2pp2/6p1/3PRp2/2PR3P/PP3PP1/6K1 w - - 0 29", "prompt": "Position (FEN): 4r2r/p1pk4/1p2pp2/6p1/3PRp2/2PR3P/PP3PP1/6K1 w - - 0 29\nShow me the board.", "gold_answer": "8 . . . . r . . r\n7 p . p k . . . .\n6 . p . . p p . .\n5 . . . . . . p .\n4 . . . P R p . .\n3 . . P R . . . P\n2 P P . . . P P .\n1 . . . . . . K .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00856", "split": "perception", "task_type": "board_to_fen", "fen": "r3k3/3p4/b5p1/2b1B3/1pP1P3/1B1P4/1P3PPP/RN3RK1 b q - 0 22", "prompt": "Here is the current board:\n8 r . . . k . . .\n7 . . . p . . . .\n6 b . . . . . p .\n5 . . b . B . . .\n4 . p P . P . . .\n3 . B . P . . . .\n2 . P . . . P P P\n1 R N . . . R K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: q\nEn passant: none\nHalfmove clock: 0\nFullmove number: 22\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r3k3/3p4/b5p1/2b1B3/1pP1P3/1B1P4/1P3PPP/RN3RK1 b q - 0 22", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00857", "split": "perception", "task_type": "piece_id", "fen": "2k3rr/pp1b4/1qnb2n1/2ppp1Pp/7N/N1PP3P/PP1BQ1B1/R4R1K w - - 6 23", "prompt": "FEN: 2k3rr/pp1b4/1qnb2n1/2ppp1Pp/7N/N1PP3P/PP1BQ1B1/R4R1K w - - 6 23\nWhat piece is on a3?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white knight", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "a3"}} {"example_id": "perception_00858", "split": "perception", "task_type": "material_count", "fen": "rnbqk1nr/ppppbppp/8/4p3/3PP3/8/PPPB1PPP/RN1QKBNR w KQkq - 3 4", "prompt": "FEN: rnbqk1nr/ppppbppp/8/4p3/3PP3/8/PPPB1PPP/RN1QKBNR w KQkq - 3 4\nWhat is the material count for both sides?", "gold_answer": "White (16 pieces): 2 bishops, 1 king, 2 knights, 8 pawns, 1 queen, 2 rooks. Black (16 pieces): 2 bishops, 1 king, 2 knights, 8 pawns, 1 queen, 2 rooks. Material is equal.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00859", "split": "perception", "task_type": "square_lookup", "fen": "2kr1b1r/pbppnppp/1pn1p3/8/2P5/1P1P4/P2QPPPP/RN2KBNR w KQ - 0 8", "prompt": "FEN: 2kr1b1r/pbppnppp/1pn1p3/8/2P5/1P1P4/P2QPPPP/RN2KBNR w KQ - 0 8\nWhat is on a7?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "a7=black pawn", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "a7", "diagnostic": true, "hard_gate": false, "square": "a7"}} {"example_id": "perception_00860", "split": "perception", "task_type": "rank_lookup", "fen": "r4r1k/1pq3p1/1p1N1p1p/3R4/b7/6QP/PP3PP1/4R1K1 w - -", "prompt": "FEN: r4r1k/1pq3p1/1p1N1p1p/3R4/b7/6QP/PP3PP1/4R1K1 w - -\nWhat is the compressed FEN row for rank 7?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 7: 1pq3p1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "7", "_rank_lookup_row": "1pq3p1", "diagnostic": true, "hard_gate": false, "rank": "7", "fen_rank_row": "1pq3p1"}} {"example_id": "perception_00861", "split": "perception", "task_type": "square_coordinates", "fen": "4r1k1/5ppp/2p1r1n1/4P1P1/1P3P2/4Q3/8/5R1K b - -", "prompt": "FEN: 4r1k1/5ppp/2p1r1n1/4P1P1/1P3P2/4Q3/8/5R1K b - -\nFor square f5, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "f5: file=f; rank=5; fen_row_from_top=4; file_index=6", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "f5", "diagnostic": true, "hard_gate": false, "square": "f5"}} {"example_id": "perception_00862", "split": "perception", "task_type": "fen_rank_expansion", "fen": "8/7k/5p1p/5P1K/8/8/8/8 w - - 3 63", "prompt": "FEN: 8/7k/5p1p/5P1K/8/8/8/8 w - - 3 63\nCompressed rank 2 row: 8\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 2: a=1; b=1; c=1; d=1; e=1; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "2", "_fen_rank_expansion_row": "8", "diagnostic": true, "hard_gate": false, "rank": "2", "fen_rank_row": "8"}} {"example_id": "perception_00863", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r3nk2/1pp5/2npb3/p3p3/2P1P1p1/3P4/PPN2PP1/2KR1B1R w - - 0 21", "prompt": "Rank 2 row before: PPN2PP1\nFile d changes from 1 to R. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 2: PPN2PP1 -> PPNR1PP1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "d1d2", "_fen_rank_cell_edit_square": "d2", "_fen_rank_cell_edit_rank": "2", "_fen_rank_cell_edit_file": "d", "_fen_rank_cell_edit_before_row": "PPN2PP1", "_fen_rank_cell_edit_after_row": "PPNR1PP1", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "R", "diagnostic": true, "hard_gate": false, "move": "d1d2", "square": "d2", "rank": "2", "file": "d", "before_row": "PPN2PP1", "after_row": "PPNR1PP1", "before_fen": "1", "after_fen": "R"}} {"example_id": "perception_00864", "split": "perception", "task_type": "fen_board_edit", "fen": "r3k1nr/p5pp/2p2p2/3pP3/3P2bN/2P3P1/P7/R1B1K2R b KQkq - 0 16", "prompt": "Board FEN before: r3k1nr/p5pp/2p2p2/3pP3/3P2bN/2P3P1/P7/R1B1K2R\nApply square edits: g4 b->1; h5 1->b\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: r3k1nr/p5pp/2p2p2/3pP2b/3P3N/2P3P1/P7/R1B1K2R", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "g4h5", "_fen_board_edit_board_fen_before": "r3k1nr/p5pp/2p2p2/3pP3/3P2bN/2P3P1/P7/R1B1K2R", "_fen_board_edit_board_fen_after": "r3k1nr/p5pp/2p2p2/3pP2b/3P3N/2P3P1/P7/R1B1K2R", "_fen_board_edit_edit_text": "g4 b->1; h5 1->b", "_fen_board_edit_changed_squares": [{"square": "g4", "before": "black bishop", "after": "empty", "before_fen": "b", "after_fen": "1"}, {"square": "h5", "before": "empty", "after": "black bishop", "before_fen": "1", "after_fen": "b"}], "diagnostic": true, "hard_gate": false, "move": "g4h5", "board_fen_before": "r3k1nr/p5pp/2p2p2/3pP3/3P2bN/2P3P1/P7/R1B1K2R", "board_fen_after": "r3k1nr/p5pp/2p2p2/3pP2b/3P3N/2P3P1/P7/R1B1K2R", "edit_text": "g4 b->1; h5 1->b", "changed_squares": [{"square": "g4", "before": "black bishop", "after": "empty", "before_fen": "b", "after_fen": "1"}, {"square": "h5", "before": "empty", "after": "black bishop", "before_fen": "1", "after_fen": "b"}]}} {"example_id": "perception_00865", "split": "perception", "task_type": "move_square_edits", "fen": "1k6/pp1b1n1p/4p1p1/1P1p1pP1/P4P2/4r2P/4N3/3RK2R b K - 3 28", "prompt": "Starting FEN: 1k6/pp1b1n1p/4p1p1/1P1p1pP1/P4P2/4r2P/4N3/3RK2R b K - 3 28\nMove: d7c8\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: d7=black bishop; c8=empty.\nSquares: d7 black bishop->empty; c8 empty->black bishop.\nRanks: rank 7 d b->1; rank 8 c 1->b.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "d7c8", "diagnostic": true, "hard_gate": false, "move": "d7c8"}} {"example_id": "perception_00866", "split": "perception", "task_type": "fen_assembly", "fen": "2Q5/1Q3p2/4p3/P3P3/5k2/3P4/8/4K3 b - - 0 46", "prompt": "Starting FEN: 2Q5/1Q3p2/4p3/P3P3/5k2/3P4/8/4K3 b - - 0 46\nMove: f4e3\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 46\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black king f4e3.\nLookup: f4=black king; e3=empty.\nSquares: f4 black king->empty; e3 empty->black king.\nRanks: rank 4 f k->1; rank 3 e 1->k.\nResult FEN: 2Q5/1Q3p2/4p3/P3P3/8/3Pk3/8/4K3 w - - 1 47", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "f4e3", "diagnostic": true, "hard_gate": false, "move": "f4e3"}} {"example_id": "perception_00867", "split": "perception", "task_type": "fen_row_application", "fen": "3r2k1/7p/3q1p2/2p3p1/2Pb1p2/P4N1P/3Q1PP1/3R3K w - - 0 33", "prompt": "Starting FEN: 3r2k1/7p/3q1p2/2p3p1/2Pb1p2/P4N1P/3Q1PP1/3R3K w - - 0 33\nMove: f3e1\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 33\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 3 P4N1P->P6P; rank 1 3R3K->3RN2K.\nResult FEN: 3r2k1/7p/3q1p2/2p3p1/2Pb1p2/P6P/3Q1PP1/3RN2K b - - 1 33", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "f3e1", "_fen_row_application_rank_rewrites": [{"rank": "3", "before": "P4N1P", "after": "P6P"}, {"rank": "1", "before": "3R3K", "after": "3RN2K"}], "diagnostic": true, "hard_gate": false, "move": "f3e1", "rank_rewrites": [{"rank": "3", "before": "P4N1P", "after": "P6P"}, {"rank": "1", "before": "3R3K", "after": "3RN2K"}]}} {"example_id": "perception_00868", "split": "perception", "task_type": "state_tracking", "fen": "3rr1k1/p1b1n1p1/1p3p1p/2pb4/4p1PN/1P5P/PBP1BP2/2KR3R b - - 1 23", "prompt": "Starting FEN: 3rr1k1/p1b1n1p1/1p3p1p/2pb4/4p1PN/1P5P/PBP1BP2/2KR3R b - - 1 23\nAfter the moves d5f7, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 23\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 3rr1k1/p1b1nbp1/1p3p1p/2p5/4p1PN/1P5P/PBP1BP2/2KR3R w - - 2 24", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "d5f7", "_state_tracking_result": "3rr1k1/p1b1nbp1/1p3p1p/2p5/4p1PN/1P5P/PBP1BP2/2KR3R w - - 2 24"}} {"example_id": "perception_00869", "split": "perception", "task_type": "material_inventory", "fen": "rn3rk1/pb1pqppp/1p2pn2/2p5/NbPP4/3BPN2/PP3PPP/R1BQ1RK1 w - - 4 9", "prompt": "FEN: rn3rk1/pb1pqppp/1p2pn2/2p5/NbPP4/3BPN2/PP3PPP/R1BQ1RK1 w - - 4 9\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=d1; rook=a1,f1; bishop=c1,d3; knight=f3,a4; pawn=a2,b2,f2,g2,h2,e3,c4,d4.\nBlack inventory: king=g8; queen=e7; rook=a8,f8; bishop=b4,b7; knight=f6,b8; pawn=c5,b6,e6,a7,d7,f7,g7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_openings", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00870", "split": "perception", "task_type": "material_piece_counts", "fen": "8/8/2k4p/2P1ppp1/1K5P/5P2/6P1/8 w - -", "prompt": "FEN: 8/8/2k4p/2P1ppp1/1K5P/5P2/6P1/8 w - -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=0; bishop=0; knight=0; pawn=4.\nBlack counts: king=1; queen=0; rook=0; bishop=0; knight=0; pawn=4.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00871", "split": "perception", "task_type": "material_value_totals", "fen": "2b1kb1r/r2qn1p1/3p4/1N2pP1p/P2p2P1/1P3N2/5P1P/R1BQ1RK1 b k -", "prompt": "FEN: 2b1kb1r/r2qn1p1/3p4/1N2pP1p/P2p2P1/1P3N2/5P1P/R1BQ1RK1 b k -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=3; knight=6; pawn=6; total=34.\nBlack values: king=0; queen=9; rook=10; bishop=6; knight=3; pawn=5; total=33.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00872", "split": "perception", "task_type": "material_balance_trace", "fen": "8/1N1n4/p7/P2k4/1P1Pp3/4b3/1B4K1/8 b - - 5 46", "prompt": "FEN: 8/1N1n4/p7/P2k4/1P1Pp3/4b3/1B4K1/8 b - - 5 46\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g2; queen=none; rook=none; bishop=b2; knight=b7; pawn=b4,d4,a5 | black king=d5; queen=none; rook=none; bishop=e3; knight=d7; pawn=e4,a6\nCounts: white king=1; queen=0; rook=0; bishop=1; knight=1; pawn=3 | black king=1; queen=0; rook=0; bishop=1; knight=1; pawn=2\nValues: white total=9; black total=8\nBalance: White is up 1 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00873", "split": "perception", "task_type": "multi_state_tracking", "fen": "4rrk1/n1p3pp/pp2q3/2b5/P1Pp1B2/1P1B1n2/1KQ3PN/R7 w - - 0 27", "prompt": "Starting FEN: 4rrk1/n1p3pp/pp2q3/2b5/P1Pp1B2/1P1B1n2/1KQ3PN/R7 w - - 0 27\nAfter the moves a1g1 e6h6 b2a2, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 27\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 4rrk1/n1p3pp/pp5q/2b5/P1Pp1B2/1P1B1n2/K1Q3PN/6R1 b - - 3 28", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "a1g1 e6h6 b2a2", "_multi_state_tracking_result": "4rrk1/n1p3pp/pp5q/2b5/P1Pp1B2/1P1B1n2/K1Q3PN/6R1 b - - 3 28", "diagnostic": true, "hard_gate": false, "moves": "a1g1 e6h6 b2a2"}} {"example_id": "perception_00874", "split": "perception", "task_type": "board_print", "fen": "8/4kpp1/7p/8/7P/1P1RK1P1/1r3P2/8 b - -", "prompt": "Position (FEN): 8/4kpp1/7p/8/7P/1P1RK1P1/1r3P2/8 b - -\nShow me the board.", "gold_answer": "8 . . . . . . . .\n7 . . . . k p p .\n6 . . . . . . . p\n5 . . . . . . . .\n4 . . . . . . . P\n3 . P . R K . P .\n2 . r . . . P . .\n1 . . . . . . . .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00875", "split": "perception", "task_type": "board_to_fen", "fen": "8/8/1p3k1p/bP6/P3K1P1/8/8/8 b - - 14 59", "prompt": "Here is the current board:\n8 . . . . . . . .\n7 . . . . . . . .\n6 . p . . . k . p\n5 b P . . . . . .\n4 P . . . K . P .\n3 . . . . . . . .\n2 . . . . . . . .\n1 . . . . . . . .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 14\nFullmove number: 59\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "8/8/1p3k1p/bP6/P3K1P1/8/8/8 b - - 14 59", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00876", "split": "perception", "task_type": "piece_id", "fen": "8/8/8/4K3/3Q4/3k4/8/8 b - -", "prompt": "FEN: 8/8/8/4K3/3Q4/3k4/8/8 b - -\nWhat piece is on e5?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white king", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "e5"}} {"example_id": "perception_00877", "split": "perception", "task_type": "material_count", "fen": "6k1/5ppp/4p3/8/4P3/2K2PP1/6bP/8 w - - 1 39", "prompt": "FEN: 6k1/5ppp/4p3/8/4P3/2K2PP1/6bP/8 w - - 1 39\nWhat is the material count for both sides?", "gold_answer": "White (5 pieces): 1 king, 4 pawns. Black (6 pieces): 1 bishop, 1 king, 4 pawns. Black is up 3 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00878", "split": "perception", "task_type": "square_lookup", "fen": "1r3rk1/3q2p1/p1n2p2/1ppppP2/8/P2PBP2/1PP3PP/R3R1K1 b - - 0 25", "prompt": "FEN: 1r3rk1/3q2p1/p1n2p2/1ppppP2/8/P2PBP2/1PP3PP/R3R1K1 b - - 0 25\nWhat is on g1?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "g1=white king", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "g1", "diagnostic": true, "hard_gate": false, "square": "g1"}} {"example_id": "perception_00879", "split": "perception", "task_type": "rank_lookup", "fen": "r2q1rk1/n1p1bpp1/p2p1n1p/1p2p3/PP2P1bP/1BPP1NP1/5P2/R1BQKN1R b KQ - 1 12", "prompt": "FEN: r2q1rk1/n1p1bpp1/p2p1n1p/1p2p3/PP2P1bP/1BPP1NP1/5P2/R1BQKN1R b KQ - 1 12\nWhat is the compressed FEN row for rank 6?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 6: p2p1n1p", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "6", "_rank_lookup_row": "p2p1n1p", "diagnostic": true, "hard_gate": false, "rank": "6", "fen_rank_row": "p2p1n1p"}} {"example_id": "perception_00880", "split": "perception", "task_type": "square_coordinates", "fen": "2k3nr/ppprqp2/1b5p/n2pP1p1/Q2P1B2/2P2N2/PP1N2PP/R4R1K w - - 0 16", "prompt": "FEN: 2k3nr/ppprqp2/1b5p/n2pP1p1/Q2P1B2/2P2N2/PP1N2PP/R4R1K w - - 0 16\nFor square a2, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "a2: file=a; rank=2; fen_row_from_top=7; file_index=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "a2", "diagnostic": true, "hard_gate": false, "square": "a2"}} {"example_id": "perception_00881", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r4rk1/4qpp1/2pp3p/1p2p3/p3P3/P2P1PQP/bPP1K1P1/R6R w - - 0 19", "prompt": "FEN: r4rk1/4qpp1/2pp3p/1p2p3/p3P3/P2P1PQP/bPP1K1P1/R6R w - - 0 19\nCompressed rank 7 row: 4qpp1\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 7: a=1; b=1; c=1; d=1; e=q; f=p; g=p; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "7", "_fen_rank_expansion_row": "4qpp1", "diagnostic": true, "hard_gate": false, "rank": "7", "fen_rank_row": "4qpp1"}} {"example_id": "perception_00882", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "8/7k/8/6pp/4q1P1/2Kn4/8/8 w - - 0 53", "prompt": "Rank 3 row before: 2Kn4\nFile b changes from 1 to K. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 3: 2Kn4 -> 1K1n4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "c3b3", "_fen_rank_cell_edit_square": "b3", "_fen_rank_cell_edit_rank": "3", "_fen_rank_cell_edit_file": "b", "_fen_rank_cell_edit_before_row": "2Kn4", "_fen_rank_cell_edit_after_row": "1K1n4", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "K", "diagnostic": true, "hard_gate": false, "move": "c3b3", "square": "b3", "rank": "3", "file": "b", "before_row": "2Kn4", "after_row": "1K1n4", "before_fen": "1", "after_fen": "K"}} {"example_id": "perception_00883", "split": "perception", "task_type": "fen_board_edit", "fen": "r3r1k1/5pp1/p1pqbn1p/3p4/P2P4/2P2P2/N1B3PP/1R1Q1RK1 b - - 2 20", "prompt": "Board FEN before: r3r1k1/5pp1/p1pqbn1p/3p4/P2P4/2P2P2/N1B3PP/1R1Q1RK1\nApply square edits: d6 q->1; c7 1->q\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: r3r1k1/2q2pp1/p1p1bn1p/3p4/P2P4/2P2P2/N1B3PP/1R1Q1RK1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "d6c7", "_fen_board_edit_board_fen_before": "r3r1k1/5pp1/p1pqbn1p/3p4/P2P4/2P2P2/N1B3PP/1R1Q1RK1", "_fen_board_edit_board_fen_after": "r3r1k1/2q2pp1/p1p1bn1p/3p4/P2P4/2P2P2/N1B3PP/1R1Q1RK1", "_fen_board_edit_edit_text": "d6 q->1; c7 1->q", "_fen_board_edit_changed_squares": [{"square": "d6", "before": "black queen", "after": "empty", "before_fen": "q", "after_fen": "1"}, {"square": "c7", "before": "empty", "after": "black queen", "before_fen": "1", "after_fen": "q"}], "diagnostic": true, "hard_gate": false, "move": "d6c7", "board_fen_before": "r3r1k1/5pp1/p1pqbn1p/3p4/P2P4/2P2P2/N1B3PP/1R1Q1RK1", "board_fen_after": "r3r1k1/2q2pp1/p1p1bn1p/3p4/P2P4/2P2P2/N1B3PP/1R1Q1RK1", "edit_text": "d6 q->1; c7 1->q", "changed_squares": [{"square": "d6", "before": "black queen", "after": "empty", "before_fen": "q", "after_fen": "1"}, {"square": "c7", "before": "empty", "after": "black queen", "before_fen": "1", "after_fen": "q"}]}} {"example_id": "perception_00884", "split": "perception", "task_type": "move_square_edits", "fen": "8/4P1p1/2k2p1p/1p3P2/1K4PP/8/8/8 b - -", "prompt": "Starting FEN: 8/4P1p1/2k2p1p/1p3P2/1K4PP/8/8/8 b - -\nMove: c6d7\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: c6=black king; d7=empty.\nSquares: c6 black king->empty; d7 empty->black king.\nRanks: rank 6 c k->1; rank 7 d 1->k.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "c6d7", "diagnostic": true, "hard_gate": false, "move": "c6d7"}} {"example_id": "perception_00885", "split": "perception", "task_type": "fen_assembly", "fen": "6k1/5r1p/p5p1/3P1p2/4pqPQ/P1p4R/3RK2P/2r5 w - - 0 33", "prompt": "Starting FEN: 6k1/5r1p/p5p1/3P1p2/4pqPQ/P1p4R/3RK2P/2r5 w - - 0 33\nMove: h4g5\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 33\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white queen h4g5.\nLookup: h4=white queen; g5=empty.\nSquares: h4 white queen->empty; g5 empty->white queen.\nRanks: rank 4 h Q->1; rank 5 g 1->Q.\nResult FEN: 6k1/5r1p/p5p1/3P1pQ1/4pqP1/P1p4R/3RK2P/2r5 b - - 1 33", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "h4g5", "diagnostic": true, "hard_gate": false, "move": "h4g5"}} {"example_id": "perception_00886", "split": "perception", "task_type": "fen_row_application", "fen": "8/p4p2/7p/2k1PB2/P1pp3P/1r4P1/3K4/8 b - - 0 42", "prompt": "Starting FEN: 8/p4p2/7p/2k1PB2/P1pp3P/1r4P1/3K4/8 b - - 0 42\nMove: b3b1\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 42\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 3 1r4P1->6P1; rank 1 8->1r6.\nResult FEN: 8/p4p2/7p/2k1PB2/P1pp3P/6P1/3K4/1r6 w - - 1 43", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "b3b1", "_fen_row_application_rank_rewrites": [{"rank": "3", "before": "1r4P1", "after": "6P1"}, {"rank": "1", "before": "8", "after": "1r6"}], "diagnostic": true, "hard_gate": false, "move": "b3b1", "rank_rewrites": [{"rank": "3", "before": "1r4P1", "after": "6P1"}, {"rank": "1", "before": "8", "after": "1r6"}]}} {"example_id": "perception_00887", "split": "perception", "task_type": "state_tracking", "fen": "r3kbnr/2q2ppp/p1b5/3pp3/6Q1/4P3/1PPP1PPP/R1B1K1NR b KQkq - 1 14", "prompt": "Starting FEN: r3kbnr/2q2ppp/p1b5/3pp3/6Q1/4P3/1PPP1PPP/R1B1K1NR b KQkq - 1 14\nAfter the moves a6a5, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 1\nFullmove number: 14\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r3kbnr/2q2ppp/2b5/p2pp3/6Q1/4P3/1PPP1PPP/R1B1K1NR w KQkq - 0 15", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "a6a5", "_state_tracking_result": "r3kbnr/2q2ppp/2b5/p2pp3/6Q1/4P3/1PPP1PPP/R1B1K1NR w KQkq - 0 15"}} {"example_id": "perception_00888", "split": "perception", "task_type": "material_inventory", "fen": "4r3/2p3b1/p3k3/1p2Pr2/3P1Bp1/1PP3P1/P4R2/5RK1 b - - 0 28", "prompt": "FEN: 4r3/2p3b1/p3k3/1p2Pr2/3P1Bp1/1PP3P1/P4R2/5RK1 b - - 0 28\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=none; rook=f1,f2; bishop=f4; knight=none; pawn=a2,b3,c3,g3,d4,e5.\nBlack inventory: king=e6; queen=none; rook=f5,e8; bishop=g7; knight=none; pawn=g4,b5,a6,c7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00889", "split": "perception", "task_type": "material_piece_counts", "fen": "r2qkb1r/pppn1ppp/3pbp2/8/2PP4/4P3/PP3PPP/RN1QKBNR w KQkq -", "prompt": "FEN: r2qkb1r/pppn1ppp/3pbp2/8/2PP4/4P3/PP3PPP/RN1QKBNR w KQkq -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=1; knight=2; pawn=8.\nBlack counts: king=1; queen=1; rook=2; bishop=2; knight=1; pawn=8.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00890", "split": "perception", "task_type": "material_value_totals", "fen": "2k1r3/p3n1pp/1R3pb1/N1p5/2P1P1P1/4K2P/P1P5/7R b - - 0 30", "prompt": "FEN: 2k1r3/p3n1pp/1R3pb1/N1p5/2P1P1P1/4K2P/P1P5/7R b - - 0 30\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=10; bishop=0; knight=3; pawn=6; total=19.\nBlack values: king=0; queen=0; rook=5; bishop=3; knight=3; pawn=5; total=16.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00891", "split": "perception", "task_type": "material_balance_trace", "fen": "8/8/4R3/3r1K2/3k4/8/8/8 w - - 10 96", "prompt": "FEN: 8/8/4R3/3r1K2/3k4/8/8/8 w - - 10 96\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=f5; queen=none; rook=e6; bishop=none; knight=none; pawn=none | black king=d4; queen=none; rook=d5; bishop=none; knight=none; pawn=none\nCounts: white king=1; queen=0; rook=1; bishop=0; knight=0; pawn=0 | black king=1; queen=0; rook=1; bishop=0; knight=0; pawn=0\nValues: white total=5; black total=5\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00892", "split": "perception", "task_type": "multi_state_tracking", "fen": "2r2rk1/1bq1bpp1/3p3p/p1pPn3/PpB1P1n1/1P2BN2/4QPPP/2NR1RK1 w - - 9 22", "prompt": "Starting FEN: 2r2rk1/1bq1bpp1/3p3p/p1pPn3/PpB1P1n1/1P2BN2/4QPPP/2NR1RK1 w - - 9 22\nAfter the moves f3g5 c7c6 e2b2, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 9\nFullmove number: 22\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 2r2rk1/1b2bpp1/2qp3p/p1pPn1N1/PpB1P1n1/1P2B3/1Q3PPP/2NR1RK1 b - - 12 23", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "f3g5 c7c6 e2b2", "_multi_state_tracking_result": "2r2rk1/1b2bpp1/2qp3p/p1pPn1N1/PpB1P1n1/1P2B3/1Q3PPP/2NR1RK1 b - - 12 23", "diagnostic": true, "hard_gate": false, "moves": "f3g5 c7c6 e2b2"}} {"example_id": "perception_00893", "split": "perception", "task_type": "board_print", "fen": "rnbqkb1r/pp2pppp/8/3p4/3pnB2/3BP3/PPP2PPP/RN1QK1NR w KQkq -", "prompt": "Position (FEN): rnbqkb1r/pp2pppp/8/3p4/3pnB2/3BP3/PPP2PPP/RN1QK1NR w KQkq -\nShow me the board.", "gold_answer": "8 r n b q k b . r\n7 p p . . p p p p\n6 . . . . . . . .\n5 . . . p . . . .\n4 . . . p n B . .\n3 . . . B P . . .\n2 P P P . . P P P\n1 R N . Q K . N R\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00894", "split": "perception", "task_type": "board_to_fen", "fen": "r1bqkb1r/ppp2ppp/2n1P3/1N1pn3/5B2/8/PPP1PPPP/R2QKBNR w KQkq - 1 7", "prompt": "Here is the current board:\n8 r . b q k b . r\n7 p p p . . p p p\n6 . . n . P . . .\n5 . N . p n . . .\n4 . . . . . B . .\n3 . . . . . . . .\n2 P P P . P P P P\n1 R . . Q K B N R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 1\nFullmove number: 7\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r1bqkb1r/ppp2ppp/2n1P3/1N1pn3/5B2/8/PPP1PPPP/R2QKBNR w KQkq - 1 7", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00895", "split": "perception", "task_type": "piece_id", "fen": "r4rk1/pp2bppp/1q3n2/2p1p3/4P1b1/2PB4/PPQNNPPP/R4RK1 w - - 2 13", "prompt": "FEN: r4rk1/pp2bppp/1q3n2/2p1p3/4P1b1/2PB4/PPQNNPPP/R4RK1 w - - 2 13\nWhat piece is on b6?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black queen", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "b6"}} {"example_id": "perception_00896", "split": "perception", "task_type": "material_count", "fen": "r2q1rk1/pp2pp2/2bp2p1/2nNb3/2P3BQ/4B3/PP4PP/3R1RK1 b - -", "prompt": "FEN: r2q1rk1/pp2pp2/2bp2p1/2nNb3/2P3BQ/4B3/PP4PP/3R1RK1 b - -\nWhat is the material count for both sides?", "gold_answer": "White (12 pieces): 2 bishops, 1 king, 1 knight, 5 pawns, 1 queen, 2 rooks. Black (13 pieces): 2 bishops, 1 king, 1 knight, 6 pawns, 1 queen, 2 rooks. Black is up 1 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00897", "split": "perception", "task_type": "square_lookup", "fen": "r3kb1r/ppp1pp2/2nq1np1/5bNp/2B5/2NPQ2P/PPP2PP1/R1B1K2R b KQkq - 1 10", "prompt": "FEN: r3kb1r/ppp1pp2/2nq1np1/5bNp/2B5/2NPQ2P/PPP2PP1/R1B1K2R b KQkq - 1 10\nWhat is on c3?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "c3=white knight", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "c3", "diagnostic": true, "hard_gate": false, "square": "c3"}} {"example_id": "perception_00898", "split": "perception", "task_type": "rank_lookup", "fen": "8/4k3/2Bp4/4b3/5qp1/8/6P1/3R2K1 w - - 2 55", "prompt": "FEN: 8/4k3/2Bp4/4b3/5qp1/8/6P1/3R2K1 w - - 2 55\nWhat is the compressed FEN row for rank 8?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 8: 8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "8", "_rank_lookup_row": "8", "diagnostic": true, "hard_gate": false, "rank": "8", "fen_rank_row": "8"}} {"example_id": "perception_00899", "split": "perception", "task_type": "square_coordinates", "fen": "r3k2r/p5p1/1qppbn1p/4p3/4P3/3P3N/PPP2PPP/R1R4K w - - 0 18", "prompt": "FEN: r3k2r/p5p1/1qppbn1p/4p3/4P3/3P3N/PPP2PPP/R1R4K w - - 0 18\nFor square d7, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "d7: file=d; rank=7; fen_row_from_top=2; file_index=4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "d7", "diagnostic": true, "hard_gate": false, "square": "d7"}} {"example_id": "perception_00900", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r1b1k2r/ppppqppp/2n2n2/6B1/1bPNP3/2N2P2/PP4PP/R2QKB1R b KQkq - 0 8", "prompt": "FEN: r1b1k2r/ppppqppp/2n2n2/6B1/1bPNP3/2N2P2/PP4PP/R2QKB1R b KQkq - 0 8\nCompressed rank 2 row: PP4PP\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 2: a=P; b=P; c=1; d=1; e=1; f=1; g=P; h=P", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "2", "_fen_rank_expansion_row": "PP4PP", "diagnostic": true, "hard_gate": false, "rank": "2", "fen_rank_row": "PP4PP"}} {"example_id": "perception_00901", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "6K1/6p1/5k2/8/8/8/8/8 b - -", "prompt": "Rank 6 row before: 5k2\nFile f changes from k to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 6: 5k2 -> 8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "f6e7", "_fen_rank_cell_edit_square": "f6", "_fen_rank_cell_edit_rank": "6", "_fen_rank_cell_edit_file": "f", "_fen_rank_cell_edit_before_row": "5k2", "_fen_rank_cell_edit_after_row": "8", "_fen_rank_cell_edit_before_fen": "k", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "f6e7", "square": "f6", "rank": "6", "file": "f", "before_row": "5k2", "after_row": "8", "before_fen": "k", "after_fen": "1"}} {"example_id": "perception_00902", "split": "perception", "task_type": "fen_board_edit", "fen": "rn3rk1/p4ppp/1ppq1n2/3p4/3P4/3QPN2/PP2NPPP/2R2RK1 b - -", "prompt": "Board FEN before: rn3rk1/p4ppp/1ppq1n2/3p4/3P4/3QPN2/PP2NPPP/2R2RK1\nApply square edits: d6 q->1; h2 P->q\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: rn3rk1/p4ppp/1pp2n2/3p4/3P4/3QPN2/PP2NPPq/2R2RK1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "d6h2", "_fen_board_edit_board_fen_before": "rn3rk1/p4ppp/1ppq1n2/3p4/3P4/3QPN2/PP2NPPP/2R2RK1", "_fen_board_edit_board_fen_after": "rn3rk1/p4ppp/1pp2n2/3p4/3P4/3QPN2/PP2NPPq/2R2RK1", "_fen_board_edit_edit_text": "d6 q->1; h2 P->q", "_fen_board_edit_changed_squares": [{"square": "d6", "before": "black queen", "after": "empty", "before_fen": "q", "after_fen": "1"}, {"square": "h2", "before": "white pawn", "after": "black queen", "before_fen": "P", "after_fen": "q"}], "diagnostic": true, "hard_gate": false, "move": "d6h2", "board_fen_before": "rn3rk1/p4ppp/1ppq1n2/3p4/3P4/3QPN2/PP2NPPP/2R2RK1", "board_fen_after": "rn3rk1/p4ppp/1pp2n2/3p4/3P4/3QPN2/PP2NPPq/2R2RK1", "edit_text": "d6 q->1; h2 P->q", "changed_squares": [{"square": "d6", "before": "black queen", "after": "empty", "before_fen": "q", "after_fen": "1"}, {"square": "h2", "before": "white pawn", "after": "black queen", "before_fen": "P", "after_fen": "q"}]}} {"example_id": "perception_00903", "split": "perception", "task_type": "move_square_edits", "fen": "rn3r2/5p1k/p4qpp/3p1n2/Np4Q1/1P3N1P/P1PP1PP1/R4RK1 w - - 2 20", "prompt": "Starting FEN: rn3r2/5p1k/p4qpp/3p1n2/Np4Q1/1P3N1P/P1PP1PP1/R4RK1 w - - 2 20\nMove: g4g3\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: g4=white queen; g3=empty.\nSquares: g4 white queen->empty; g3 empty->white queen.\nRanks: rank 4 g Q->1; rank 3 g 1->Q.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "g4g3", "diagnostic": true, "hard_gate": false, "move": "g4g3"}} {"example_id": "perception_00904", "split": "perception", "task_type": "fen_assembly", "fen": "2krr3/b3np2/p4q2/1pp2P1p/5Qp1/P1PB2B1/1P4PP/1K1R1R2 b - - 1 24", "prompt": "Starting FEN: 2krr3/b3np2/p4q2/1pp2P1p/5Qp1/P1PB2B1/1P4PP/1K1R1R2 b - - 1 24\nMove: f6h6\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 24\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black queen f6h6.\nLookup: f6=black queen; h6=empty.\nSquares: f6 black queen->empty; h6 empty->black queen.\nRanks: rank 6 f q->1; rank 6 h 1->q.\nResult FEN: 2krr3/b3np2/p6q/1pp2P1p/5Qp1/P1PB2B1/1P4PP/1K1R1R2 w - - 2 25", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "f6h6", "diagnostic": true, "hard_gate": false, "move": "f6h6"}} {"example_id": "perception_00905", "split": "perception", "task_type": "fen_row_application", "fen": "r2q1rk1/ppp1b1p1/3p1pP1/2n1p2p/3nP2P/1PN5/PBPP1PQ1/2KR1B1R w - - 0 14", "prompt": "Starting FEN: r2q1rk1/ppp1b1p1/3p1pP1/2n1p2p/3nP2P/1PN5/PBPP1PQ1/2KR1B1R w - - 0 14\nMove: f1a6\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 14\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 1 2KR1B1R->2KR3R; rank 6 3p1pP1->B2p1pP1.\nResult FEN: r2q1rk1/ppp1b1p1/B2p1pP1/2n1p2p/3nP2P/1PN5/PBPP1PQ1/2KR3R b - - 1 14", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "f1a6", "_fen_row_application_rank_rewrites": [{"rank": "1", "before": "2KR1B1R", "after": "2KR3R"}, {"rank": "6", "before": "3p1pP1", "after": "B2p1pP1"}], "diagnostic": true, "hard_gate": false, "move": "f1a6", "rank_rewrites": [{"rank": "1", "before": "2KR1B1R", "after": "2KR3R"}, {"rank": "6", "before": "3p1pP1", "after": "B2p1pP1"}]}} {"example_id": "perception_00906", "split": "perception", "task_type": "state_tracking", "fen": "rnbqk2r/pp3ppp/2p2n2/3P2B1/1b1Pp3/2N3P1/PP2PPBP/R2QK1NR b KQkq -", "prompt": "Starting FEN: rnbqk2r/pp3ppp/2p2n2/3P2B1/1b1Pp3/2N3P1/PP2PPBP/R2QK1NR b KQkq - 0 1\nAfter the moves b7b6, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rnbqk2r/p4ppp/1pp2n2/3P2B1/1b1Pp3/2N3P1/PP2PPBP/R2QK1NR w KQkq - 0 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "b7b6", "_state_tracking_result": "rnbqk2r/p4ppp/1pp2n2/3P2B1/1b1Pp3/2N3P1/PP2PPBP/R2QK1NR w KQkq - 0 2"}} {"example_id": "perception_00907", "split": "perception", "task_type": "material_inventory", "fen": "2r5/p2R4/7p/8/3P1b2/5kP1/PP3P2/5K2 w - -", "prompt": "FEN: 2r5/p2R4/7p/8/3P1b2/5kP1/PP3P2/5K2 w - -\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=f1; queen=none; rook=d7; bishop=none; knight=none; pawn=a2,b2,f2,g3,d4.\nBlack inventory: king=f3; queen=none; rook=c8; bishop=f4; knight=none; pawn=h6,a7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00908", "split": "perception", "task_type": "material_piece_counts", "fen": "rnbqkb1r/3p1ppp/8/1p1p4/2p1nP2/5N2/PPP3PP/RNBQK2R b KQkq - 1 10", "prompt": "FEN: rnbqkb1r/3p1ppp/8/1p1p4/2p1nP2/5N2/PPP3PP/RNBQK2R b KQkq - 1 10\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=1; knight=2; pawn=6.\nBlack counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00909", "split": "perception", "task_type": "material_value_totals", "fen": "r3nrk1/2qpbppp/b7/p3pP2/1pPpP1P1/1P1P2NP/P3Q1B1/RN3RK1 w - - 1 18", "prompt": "FEN: r3nrk1/2qpbppp/b7/p3pP2/1pPpP1P1/1P1P2NP/P3Q1B1/RN3RK1 w - - 1 18\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=3; knight=6; pawn=8; total=36.\nBlack values: king=0; queen=9; rook=10; bishop=6; knight=3; pawn=8; total=36.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00910", "split": "perception", "task_type": "material_balance_trace", "fen": "7r/1b1N2k1/2n1p3/1p6/p1pP1P2/P1P5/2K3P1/8 b - - 0 34", "prompt": "FEN: 7r/1b1N2k1/2n1p3/1p6/p1pP1P2/P1P5/2K3P1/8 b - - 0 34\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=c2; queen=none; rook=none; bishop=none; knight=d7; pawn=g2,a3,c3,d4,f4 | black king=g7; queen=none; rook=h8; bishop=b7; knight=c6; pawn=a4,c4,b5,e6\nCounts: white king=1; queen=0; rook=0; bishop=0; knight=1; pawn=5 | black king=1; queen=0; rook=1; bishop=1; knight=1; pawn=4\nValues: white total=8; black total=15\nBalance: Black is up 7 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00911", "split": "perception", "task_type": "multi_state_tracking", "fen": "7r/2k5/8/7R/6KP/5P2/8/8 b - - 4 58", "prompt": "Starting FEN: 7r/2k5/8/7R/6KP/5P2/8/8 b - - 4 58\nAfter the moves h8e8 h5c5 c7d8, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 4\nFullmove number: 58\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 3kr3/8/8/2R5/6KP/5P2/8/8 w - - 7 60", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "h8e8 h5c5 c7d8", "_multi_state_tracking_result": "3kr3/8/8/2R5/6KP/5P2/8/8 w - - 7 60", "diagnostic": true, "hard_gate": false, "moves": "h8e8 h5c5 c7d8"}} {"example_id": "perception_00912", "split": "perception", "task_type": "board_print", "fen": "r1b1k2r/ppq2ppp/2nbpn2/2pp4/8/1P2PP2/PBPPN1PP/RN1QKB1R w KQkq - 3 8", "prompt": "Position (FEN): r1b1k2r/ppq2ppp/2nbpn2/2pp4/8/1P2PP2/PBPPN1PP/RN1QKB1R w KQkq - 3 8\nShow me the board.", "gold_answer": "8 r . b . k . . r\n7 p p q . . p p p\n6 . . n b p n . .\n5 . . p p . . . .\n4 . . . . . . . .\n3 . P . . P P . .\n2 P B P P N . P P\n1 R N . Q K B . R\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00913", "split": "perception", "task_type": "board_to_fen", "fen": "r3kb1r/p1qppppp/bp3n2/8/1n1PP3/5N2/PP2NPPP/RBBQ1RK1 b kq -", "prompt": "Here is the current board:\n8 r . . . k b . r\n7 p . q p p p p p\n6 b p . . . n . .\n5 . . . . . . . .\n4 . n . P P . . .\n3 . . . . . N . .\n2 P P . . N P P P\n1 R B B Q . R K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: kq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r3kb1r/p1qppppp/bp3n2/8/1n1PP3/5N2/PP2NPPP/RBBQ1RK1 b kq - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00914", "split": "perception", "task_type": "piece_id", "fen": "r2q1rk1/3b3p/p1p1p1p1/3pP2n/8/2PBP2P/PP4P1/R2Q1RK1 b - - 0 20", "prompt": "FEN: r2q1rk1/3b3p/p1p1p1p1/3pP2n/8/2PBP2P/PP4P1/R2Q1RK1 b - - 0 20\nWhat piece is on a6?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "a6"}} {"example_id": "perception_00915", "split": "perception", "task_type": "material_count", "fen": "r3k1nN/p2n1pp1/2p1b2p/1p1p4/3P3P/1R1B4/P1PK1PP1/4R3 b q -", "prompt": "FEN: r3k1nN/p2n1pp1/2p1b2p/1p1p4/3P3P/1R1B4/P1PK1PP1/4R3 b q -\nWhat is the material count for both sides?", "gold_answer": "White (11 pieces): 1 bishop, 1 king, 1 knight, 6 pawns, 2 rooks. Black (12 pieces): 1 bishop, 1 king, 2 knights, 7 pawns, 1 rook. White is up 1 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00916", "split": "perception", "task_type": "square_lookup", "fen": "4r3/p5pp/1p1k1p2/3P1K2/8/P6P/BP6/8 b - - 0 33", "prompt": "FEN: 4r3/p5pp/1p1k1p2/3P1K2/8/P6P/BP6/8 b - - 0 33\nWhat is on d7?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "d7=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "d7", "diagnostic": true, "hard_gate": false, "square": "d7"}} {"example_id": "perception_00917", "split": "perception", "task_type": "rank_lookup", "fen": "3rk3/p4p2/1p1b1nr1/q1p1P2p/5Q2/P1B1N3/1PB2PPP/1R2K2R b K - 0 25", "prompt": "FEN: 3rk3/p4p2/1p1b1nr1/q1p1P2p/5Q2/P1B1N3/1PB2PPP/1R2K2R b K - 0 25\nWhat is the compressed FEN row for rank 3?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 3: P1B1N3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "3", "_rank_lookup_row": "P1B1N3", "diagnostic": true, "hard_gate": false, "rank": "3", "fen_rank_row": "P1B1N3"}} {"example_id": "perception_00918", "split": "perception", "task_type": "square_coordinates", "fen": "8/8/R7/8/1R6/2k1K3/8/8 w - -", "prompt": "FEN: 8/8/R7/8/1R6/2k1K3/8/8 w - -\nFor square b4, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "b4: file=b; rank=4; fen_row_from_top=5; file_index=2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "b4", "diagnostic": true, "hard_gate": false, "square": "b4"}} {"example_id": "perception_00919", "split": "perception", "task_type": "fen_rank_expansion", "fen": "4qknr/Q1p2pbp/4p1p1/3pP3/3p4/P4N2/1PP2PPP/RNB3K1 w - - 0 15", "prompt": "FEN: 4qknr/Q1p2pbp/4p1p1/3pP3/3p4/P4N2/1PP2PPP/RNB3K1 w - - 0 15\nCompressed rank 5 row: 3pP3\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 5: a=1; b=1; c=1; d=p; e=P; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "5", "_fen_rank_expansion_row": "3pP3", "diagnostic": true, "hard_gate": false, "rank": "5", "fen_rank_row": "3pP3"}} {"example_id": "perception_00920", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "8/8/1p2kpR1/3bp3/5rKN/8/8/8 w - - 6 51", "prompt": "Rank 3 row before: 8\nFile h changes from 1 to K. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 3: 8 -> 7K", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "g4h3", "_fen_rank_cell_edit_square": "h3", "_fen_rank_cell_edit_rank": "3", "_fen_rank_cell_edit_file": "h", "_fen_rank_cell_edit_before_row": "8", "_fen_rank_cell_edit_after_row": "7K", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "K", "diagnostic": true, "hard_gate": false, "move": "g4h3", "square": "h3", "rank": "3", "file": "h", "before_row": "8", "after_row": "7K", "before_fen": "1", "after_fen": "K"}} {"example_id": "perception_00921", "split": "perception", "task_type": "fen_board_edit", "fen": "rn1qkb1r/ppp1pppp/4bn2/8/2p5/N4NP1/PPQPPPBP/R1B1K2R b KQkq -", "prompt": "Board FEN before: rn1qkb1r/ppp1pppp/4bn2/8/2p5/N4NP1/PPQPPPBP/R1B1K2R\nApply square edits: h7 p->1; h5 1->p\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: rn1qkb1r/ppp1ppp1/4bn2/7p/2p5/N4NP1/PPQPPPBP/R1B1K2R", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "h7h5", "_fen_board_edit_board_fen_before": "rn1qkb1r/ppp1pppp/4bn2/8/2p5/N4NP1/PPQPPPBP/R1B1K2R", "_fen_board_edit_board_fen_after": "rn1qkb1r/ppp1ppp1/4bn2/7p/2p5/N4NP1/PPQPPPBP/R1B1K2R", "_fen_board_edit_edit_text": "h7 p->1; h5 1->p", "_fen_board_edit_changed_squares": [{"square": "h7", "before": "black pawn", "after": "empty", "before_fen": "p", "after_fen": "1"}, {"square": "h5", "before": "empty", "after": "black pawn", "before_fen": "1", "after_fen": "p"}], "diagnostic": true, "hard_gate": false, "move": "h7h5", "board_fen_before": "rn1qkb1r/ppp1pppp/4bn2/8/2p5/N4NP1/PPQPPPBP/R1B1K2R", "board_fen_after": "rn1qkb1r/ppp1ppp1/4bn2/7p/2p5/N4NP1/PPQPPPBP/R1B1K2R", "edit_text": "h7 p->1; h5 1->p", "changed_squares": [{"square": "h7", "before": "black pawn", "after": "empty", "before_fen": "p", "after_fen": "1"}, {"square": "h5", "before": "empty", "after": "black pawn", "before_fen": "1", "after_fen": "p"}]}} {"example_id": "perception_00922", "split": "perception", "task_type": "move_square_edits", "fen": "8/5p2/8/1PK3pp/P1P5/5p2/2P3kP/8 b - - 0 42", "prompt": "Starting FEN: 8/5p2/8/1PK3pp/P1P5/5p2/2P3kP/8 b - - 0 42\nMove: g2h1\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: g2=black king; h1=empty.\nSquares: g2 black king->empty; h1 empty->black king.\nRanks: rank 2 g k->1; rank 1 h 1->k.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "g2h1", "diagnostic": true, "hard_gate": false, "move": "g2h1"}} {"example_id": "perception_00923", "split": "perception", "task_type": "fen_assembly", "fen": "8/1B3p2/8/6kp/1R4p1/4K3/5rP1/8 b - -", "prompt": "Starting FEN: 8/1B3p2/8/6kp/1R4p1/4K3/5rP1/8 b - - 0 1\nMove: f2a2\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black rook f2a2.\nLookup: f2=black rook; a2=empty.\nSquares: f2 black rook->empty; a2 empty->black rook.\nRanks: rank 2 f r->1; rank 2 a 1->r.\nResult FEN: 8/1B3p2/8/6kp/1R4p1/4K3/r5P1/8 w - - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "f2a2", "diagnostic": true, "hard_gate": false, "move": "f2a2"}} {"example_id": "perception_00924", "split": "perception", "task_type": "fen_row_application", "fen": "r2q1bnr/ppp1kbpp/3p1p2/1B1Pp2P/4P1P1/5Q2/PPP2P2/RNB1K2R w KQ -", "prompt": "Starting FEN: r2q1bnr/ppp1kbpp/3p1p2/1B1Pp2P/4P1P1/5Q2/PPP2P2/RNB1K2R w KQ - 0 1\nMove: c1d2\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 1 RNB1K2R->RN2K2R; rank 2 PPP2P2->PPPB1P2.\nResult FEN: r2q1bnr/ppp1kbpp/3p1p2/1B1Pp2P/4P1P1/5Q2/PPPB1P2/RN2K2R b KQ - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "c1d2", "_fen_row_application_rank_rewrites": [{"rank": "1", "before": "RNB1K2R", "after": "RN2K2R"}, {"rank": "2", "before": "PPP2P2", "after": "PPPB1P2"}], "diagnostic": true, "hard_gate": false, "move": "c1d2", "rank_rewrites": [{"rank": "1", "before": "RNB1K2R", "after": "RN2K2R"}, {"rank": "2", "before": "PPP2P2", "after": "PPPB1P2"}]}} {"example_id": "perception_00925", "split": "perception", "task_type": "state_tracking", "fen": "r1bqk2r/bpp2p2/p1np1n2/4p1Np/P1B1P1P1/2PP3P/1P1N1P2/R1BQ1RK1 b kq -", "prompt": "Starting FEN: r1bqk2r/bpp2p2/p1np1n2/4p1Np/P1B1P1P1/2PP3P/1P1N1P2/R1BQ1RK1 b kq - 0 1\nAfter the moves f6g4, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: kq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r1bqk2r/bpp2p2/p1np4/4p1Np/P1B1P1n1/2PP3P/1P1N1P2/R1BQ1RK1 w kq - 0 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "f6g4", "_state_tracking_result": "r1bqk2r/bpp2p2/p1np4/4p1Np/P1B1P1n1/2PP3P/1P1N1P2/R1BQ1RK1 w kq - 0 2"}} {"example_id": "perception_00926", "split": "perception", "task_type": "material_inventory", "fen": "r3rqk1/pb1nn3/1p1p2pp/2pPp3/2P1P1P1/P1Q1BP2/1P2B1N1/R3K2R b KQ -", "prompt": "FEN: r3rqk1/pb1nn3/1p1p2pp/2pPp3/2P1P1P1/P1Q1BP2/1P2B1N1/R3K2R b KQ -\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=e1; queen=c3; rook=a1,h1; bishop=e2,e3; knight=g2; pawn=b2,a3,f3,c4,e4,g4,d5.\nBlack inventory: king=g8; queen=f8; rook=a8,e8; bishop=b7; knight=d7,e7; pawn=c5,e5,b6,d6,g6,h6,a7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00927", "split": "perception", "task_type": "material_piece_counts", "fen": "r7/4kp1p/3p4/pP6/1n1PP2P/1P4K1/8/R4R2 w - - 5 34", "prompt": "FEN: r7/4kp1p/3p4/pP6/1n1PP2P/1P4K1/8/R4R2 w - - 5 34\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=2; bishop=0; knight=0; pawn=5.\nBlack counts: king=1; queen=0; rook=1; bishop=0; knight=1; pawn=4.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00928", "split": "perception", "task_type": "material_value_totals", "fen": "r1bq1rk1/1p1pnpbp/p1n1p1p1/1Bp5/4PB2/2NP1N2/PPP2PPP/R2Q1RK1 w - -", "prompt": "FEN: r1bq1rk1/1p1pnpbp/p1n1p1p1/1Bp5/4PB2/2NP1N2/PPP2PPP/R2Q1RK1 w - -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=8; total=39.\nBlack values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=8; total=39.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00929", "split": "perception", "task_type": "material_balance_trace", "fen": "r1b1k1n1/pppp1p1p/8/5p1Q/3qPP2/6P1/PPP4P/RN2KB1R w KQq - 0 14", "prompt": "FEN: r1b1k1n1/pppp1p1p/8/5p1Q/3qPP2/6P1/PPP4P/RN2KB1R w KQq - 0 14\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=e1; queen=h5; rook=a1,h1; bishop=f1; knight=b1; pawn=a2,b2,c2,h2,g3,e4,f4 | black king=e8; queen=d4; rook=a8; bishop=c8; knight=g8; pawn=f5,a7,b7,c7,d7,f7,h7\nCounts: white king=1; queen=1; rook=2; bishop=1; knight=1; pawn=7 | black king=1; queen=1; rook=1; bishop=1; knight=1; pawn=7\nValues: white total=32; black total=27\nBalance: White is up 5 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00930", "split": "perception", "task_type": "multi_state_tracking", "fen": "2r2rk1/1p2q2p/pb1p2p1/4np2/1Pb5/P1Q1PN2/1B2B1PP/R3K2R w KQ - 0 20", "prompt": "Starting FEN: 2r2rk1/1p2q2p/pb1p2p1/4np2/1Pb5/P1Q1PN2/1B2B1PP/R3K2R w KQ - 0 20\nAfter the moves e3e4 f5e4, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 0\nFullmove number: 20\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 2r2rk1/1p2q2p/pb1p2p1/4n3/1Pb1p3/P1Q2N2/1B2B1PP/R3K2R w KQ - 0 21", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "e3e4 f5e4", "_multi_state_tracking_result": "2r2rk1/1p2q2p/pb1p2p1/4n3/1Pb1p3/P1Q2N2/1B2B1PP/R3K2R w KQ - 0 21", "diagnostic": true, "hard_gate": false, "moves": "e3e4 f5e4"}} {"example_id": "perception_00931", "split": "perception", "task_type": "board_print", "fen": "6k1/6pp/p3p3/3p4/P2B1Pp1/P3P1K1/2rq3P/5RQ1 w - - 0 34", "prompt": "Position (FEN): 6k1/6pp/p3p3/3p4/P2B1Pp1/P3P1K1/2rq3P/5RQ1 w - - 0 34\nShow me the board.", "gold_answer": "8 . . . . . . k .\n7 . . . . . . p p\n6 p . . . p . . .\n5 . . . p . . . .\n4 P . . B . P p .\n3 P . . . P . K .\n2 . . r q . . . P\n1 . . . . . R Q .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00932", "split": "perception", "task_type": "board_to_fen", "fen": "r1bq1rk1/bpp2ppp/p1n5/3p4/B2PN3/5N1P/PP3PP1/R1BQR1K1 b - - 0 12", "prompt": "Here is the current board:\n8 r . b q . r k .\n7 b p p . . p p p\n6 p . n . . . . .\n5 . . . p . . . .\n4 B . . P N . . .\n3 . . . . . N . P\n2 P P . . . P P .\n1 R . B Q R . K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 12\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r1bq1rk1/bpp2ppp/p1n5/3p4/B2PN3/5N1P/PP3PP1/R1BQR1K1 b - - 0 12", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00933", "split": "perception", "task_type": "piece_id", "fen": "rn1qk2r/p1p2ppp/1p1Bpn2/3p1b2/P1PP4/1Q2P3/1P3PPP/RN2KBNR b KQkq -", "prompt": "FEN: rn1qk2r/p1p2ppp/1p1Bpn2/3p1b2/P1PP4/1Q2P3/1P3PPP/RN2KBNR b KQkq -\nWhat piece is on d8?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black queen", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "d8"}} {"example_id": "perception_00934", "split": "perception", "task_type": "material_count", "fen": "r1bqk2r/1p1nbppp/p2p1n2/4p3/4PP2/2NB1N2/PPP3PP/R1BQ1RK1 b kq -", "prompt": "FEN: r1bqk2r/1p1nbppp/p2p1n2/4p3/4PP2/2NB1N2/PPP3PP/R1BQ1RK1 b kq -\nWhat is the material count for both sides?", "gold_answer": "White (15 pieces): 2 bishops, 1 king, 2 knights, 7 pawns, 1 queen, 2 rooks. Black (15 pieces): 2 bishops, 1 king, 2 knights, 7 pawns, 1 queen, 2 rooks. Material is equal.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00935", "split": "perception", "task_type": "square_lookup", "fen": "8/1P4pk/8/Q3p2p/8/P6P/6PK/4r3 b - - 2 39", "prompt": "FEN: 8/1P4pk/8/Q3p2p/8/P6P/6PK/4r3 b - - 2 39\nWhat is on g2?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "g2=white pawn", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "g2", "diagnostic": true, "hard_gate": false, "square": "g2"}} {"example_id": "perception_00936", "split": "perception", "task_type": "rank_lookup", "fen": "5rk1/2Q1np1p/5q2/5p2/P2P1P2/b1P4N/3r1PPP/1RR3K1 b - - 0 21", "prompt": "FEN: 5rk1/2Q1np1p/5q2/5p2/P2P1P2/b1P4N/3r1PPP/1RR3K1 b - - 0 21\nWhat is the compressed FEN row for rank 5?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 5: 5p2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "5", "_rank_lookup_row": "5p2", "diagnostic": true, "hard_gate": false, "rank": "5", "fen_rank_row": "5p2"}} {"example_id": "perception_00937", "split": "perception", "task_type": "square_coordinates", "fen": "r1bqk2r/pp1p1ppp/2n5/3Np3/4P1n1/6N1/PPPQ1bPP/R1BK1B1R w kq -", "prompt": "FEN: r1bqk2r/pp1p1ppp/2n5/3Np3/4P1n1/6N1/PPPQ1bPP/R1BK1B1R w kq -\nFor square e6, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "e6: file=e; rank=6; fen_row_from_top=3; file_index=5", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "e6", "diagnostic": true, "hard_gate": false, "square": "e6"}} {"example_id": "perception_00938", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r2q1rk1/1p4pp/p7/P1pp4/8/1P1P1n2/2P2p1P/R2K1QNR w - - 0 24", "prompt": "FEN: r2q1rk1/1p4pp/p7/P1pp4/8/1P1P1n2/2P2p1P/R2K1QNR w - - 0 24\nCompressed rank 6 row: p7\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 6: a=p; b=1; c=1; d=1; e=1; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "6", "_fen_rank_expansion_row": "p7", "diagnostic": true, "hard_gate": false, "rank": "6", "fen_rank_row": "p7"}} {"example_id": "perception_00939", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r4rk1/pb1nqppp/1pp1pn2/3P4/3P4/1P1Q1NP1/P3PPBP/RN3RK1 b - - 0 11", "prompt": "Rank 5 row before: 3P4\nFile b changes from 1 to p. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 5: 3P4 -> 1p1P4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "b6b5", "_fen_rank_cell_edit_square": "b5", "_fen_rank_cell_edit_rank": "5", "_fen_rank_cell_edit_file": "b", "_fen_rank_cell_edit_before_row": "3P4", "_fen_rank_cell_edit_after_row": "1p1P4", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "p", "diagnostic": true, "hard_gate": false, "move": "b6b5", "square": "b5", "rank": "5", "file": "b", "before_row": "3P4", "after_row": "1p1P4", "before_fen": "1", "after_fen": "p"}} {"example_id": "perception_00940", "split": "perception", "task_type": "fen_board_edit", "fen": "6rk/pb4rq/1pn1p3/2ppPpbP/5Q2/2PP3P/PP2NBBK/4R1R1 w - - 0 30", "prompt": "Board FEN before: 6rk/pb4rq/1pn1p3/2ppPpbP/5Q2/2PP3P/PP2NBBK/4R1R1\nApply square edits: f4 Q->1; g5 b->Q\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 6rk/pb4rq/1pn1p3/2ppPpQP/8/2PP3P/PP2NBBK/4R1R1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "f4g5", "_fen_board_edit_board_fen_before": "6rk/pb4rq/1pn1p3/2ppPpbP/5Q2/2PP3P/PP2NBBK/4R1R1", "_fen_board_edit_board_fen_after": "6rk/pb4rq/1pn1p3/2ppPpQP/8/2PP3P/PP2NBBK/4R1R1", "_fen_board_edit_edit_text": "f4 Q->1; g5 b->Q", "_fen_board_edit_changed_squares": [{"square": "f4", "before": "white queen", "after": "empty", "before_fen": "Q", "after_fen": "1"}, {"square": "g5", "before": "black bishop", "after": "white queen", "before_fen": "b", "after_fen": "Q"}], "diagnostic": true, "hard_gate": false, "move": "f4g5", "board_fen_before": "6rk/pb4rq/1pn1p3/2ppPpbP/5Q2/2PP3P/PP2NBBK/4R1R1", "board_fen_after": "6rk/pb4rq/1pn1p3/2ppPpQP/8/2PP3P/PP2NBBK/4R1R1", "edit_text": "f4 Q->1; g5 b->Q", "changed_squares": [{"square": "f4", "before": "white queen", "after": "empty", "before_fen": "Q", "after_fen": "1"}, {"square": "g5", "before": "black bishop", "after": "white queen", "before_fen": "b", "after_fen": "Q"}]}} {"example_id": "perception_00941", "split": "perception", "task_type": "move_square_edits", "fen": "rn1qk2r/ppp1npbp/4b1p1/8/8/6P1/PPPP1PBP/RNBQK1NR w KQkq - 0 7", "prompt": "Starting FEN: rn1qk2r/ppp1npbp/4b1p1/8/8/6P1/PPPP1PBP/RNBQK1NR w KQkq - 0 7\nMove: g1e2\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: g1=white knight; e2=empty.\nSquares: g1 white knight->empty; e2 empty->white knight.\nRanks: rank 1 g N->1; rank 2 e 1->N.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "g1e2", "diagnostic": true, "hard_gate": false, "move": "g1e2"}} {"example_id": "perception_00942", "split": "perception", "task_type": "fen_assembly", "fen": "r3kbnr/pppq1ppp/2n5/4p3/2BP4/1Q2PP2/PP3P1P/RNB1K2R w KQkq -", "prompt": "Starting FEN: r3kbnr/pppq1ppp/2n5/4p3/2BP4/1Q2PP2/PP3P1P/RNB1K2R w KQkq - 0 1\nMove: h1f1\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white rook h1f1.\nLookup: h1=white rook; f1=empty.\nSquares: h1 white rook->empty; f1 empty->white rook.\nRanks: rank 1 h R->1; rank 1 f 1->R.\nResult FEN: r3kbnr/pppq1ppp/2n5/4p3/2BP4/1Q2PP2/PP3P1P/RNB1KR2 b Qkq - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "h1f1", "diagnostic": true, "hard_gate": false, "move": "h1f1"}} {"example_id": "perception_00943", "split": "perception", "task_type": "fen_row_application", "fen": "rnbq1rk1/5ppp/2pp1n2/ppb1p3/4P3/PB1P1N1P/1PP1NPP1/R1BQK2R b KQ - 0 9", "prompt": "Starting FEN: rnbq1rk1/5ppp/2pp1n2/ppb1p3/4P3/PB1P1N1P/1PP1NPP1/R1BQK2R b KQ - 0 9\nMove: g7g5\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 0\nFullmove number: 9\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 7 5ppp->5p1p; rank 5 ppb1p3->ppb1p1p1.\nResult FEN: rnbq1rk1/5p1p/2pp1n2/ppb1p1p1/4P3/PB1P1N1P/1PP1NPP1/R1BQK2R w KQ - 0 10", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "g7g5", "_fen_row_application_rank_rewrites": [{"rank": "7", "before": "5ppp", "after": "5p1p"}, {"rank": "5", "before": "ppb1p3", "after": "ppb1p1p1"}], "diagnostic": true, "hard_gate": false, "move": "g7g5", "rank_rewrites": [{"rank": "7", "before": "5ppp", "after": "5p1p"}, {"rank": "5", "before": "ppb1p3", "after": "ppb1p1p1"}]}} {"example_id": "perception_00944", "split": "perception", "task_type": "state_tracking", "fen": "rnbq1rk1/1p2ppb1/p2p1np1/8/2BNP2p/2N2P1P/PPPQ1BP1/R3K2R b KQ -", "prompt": "Starting FEN: rnbq1rk1/1p2ppb1/p2p1np1/8/2BNP2p/2N2P1P/PPPQ1BP1/R3K2R b KQ - 0 1\nAfter the moves c8e6, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rn1q1rk1/1p2ppb1/p2pbnp1/8/2BNP2p/2N2P1P/PPPQ1BP1/R3K2R w KQ - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "c8e6", "_state_tracking_result": "rn1q1rk1/1p2ppb1/p2pbnp1/8/2BNP2p/2N2P1P/PPPQ1BP1/R3K2R w KQ - 1 2"}} {"example_id": "perception_00945", "split": "perception", "task_type": "material_inventory", "fen": "r3k2r/pbq1bp2/1p1p2p1/4p2p/1PP2n2/P1B1Q1N1/5PPP/3RR1K1 b kq - 4 23", "prompt": "FEN: r3k2r/pbq1bp2/1p1p2p1/4p2p/1PP2n2/P1B1Q1N1/5PPP/3RR1K1 b kq - 4 23\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=e3; rook=d1,e1; bishop=c3; knight=g3; pawn=f2,g2,h2,a3,b4,c4.\nBlack inventory: king=e8; queen=c7; rook=a8,h8; bishop=b7,e7; knight=f4; pawn=e5,h5,b6,d6,g6,a7,f7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00946", "split": "perception", "task_type": "material_piece_counts", "fen": "7r/1pp5/p2p1k1r/4p3/3n2B1/3P1P2/PPP3P1/R4RK1 w - - 1 24", "prompt": "FEN: 7r/1pp5/p2p1k1r/4p3/3n2B1/3P1P2/PPP3P1/R4RK1 w - - 1 24\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=2; bishop=1; knight=0; pawn=6.\nBlack counts: king=1; queen=0; rook=2; bishop=0; knight=1; pawn=5.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00947", "split": "perception", "task_type": "material_value_totals", "fen": "3Q4/5pk1/4p3/8/p6P/6P1/5P2/q5K1 w - - 1 52", "prompt": "FEN: 3Q4/5pk1/4p3/8/p6P/6P1/5P2/q5K1 w - - 1 52\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=0; bishop=0; knight=0; pawn=3; total=12.\nBlack values: king=0; queen=9; rook=0; bishop=0; knight=0; pawn=3; total=12.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00948", "split": "perception", "task_type": "material_balance_trace", "fen": "rnb2rk1/4qpp1/p2p1n1p/1ppP4/1bP5/2N2PN1/PPQB2PP/2KR1B1R w - -", "prompt": "FEN: rnb2rk1/4qpp1/p2p1n1p/1ppP4/1bP5/2N2PN1/PPQB2PP/2KR1B1R w - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=c1; queen=c2; rook=d1,h1; bishop=f1,d2; knight=c3,g3; pawn=a2,b2,g2,h2,f3,c4,d5 | black king=g8; queen=e7; rook=a8,f8; bishop=b4,c8; knight=f6,b8; pawn=b5,c5,a6,d6,h6,f7,g7\nCounts: white king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7 | black king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7\nValues: white total=38; black total=38\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00949", "split": "perception", "task_type": "multi_state_tracking", "fen": "7k/ppp5/3p1N1P/r7/1K6/1P1R1p2/P1P5/1r4q1 b - - 5 35", "prompt": "Starting FEN: 7k/ppp5/3p1N1P/r7/1K6/1P1R1p2/P1P5/1r4q1 b - - 5 35\nAfter the moves b1c1 d3e3 g1f1, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 5\nFullmove number: 35\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 7k/ppp5/3p1N1P/r7/1K6/1P2Rp2/P1P5/2r2q2 w - - 8 37", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "b1c1 d3e3 g1f1", "_multi_state_tracking_result": "7k/ppp5/3p1N1P/r7/1K6/1P2Rp2/P1P5/2r2q2 w - - 8 37", "diagnostic": true, "hard_gate": false, "moves": "b1c1 d3e3 g1f1"}} {"example_id": "perception_00950", "split": "perception", "task_type": "board_print", "fen": "r2qkb1r/ppp2ppp/2npbn2/1B2p3/4P3/2P2N1P/PP1P1PP1/RNBQ1RK1 w kq -", "prompt": "Position (FEN): r2qkb1r/ppp2ppp/2npbn2/1B2p3/4P3/2P2N1P/PP1P1PP1/RNBQ1RK1 w kq -\nShow me the board.", "gold_answer": "8 r . . q k b . r\n7 p p p . . p p p\n6 . . n p b n . .\n5 . B . . p . . .\n4 . . . . P . . .\n3 . . P . . N . P\n2 P P . P . P P .\n1 R N B Q . R K .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00951", "split": "perception", "task_type": "board_to_fen", "fen": "1r6/q1pk1pp1/P3p1bp/3r4/1P6/2Q4P/5PP1/R1R3K1 w - - 5 31", "prompt": "Here is the current board:\n8 . r . . . . . .\n7 q . p k . p p .\n6 P . . . p . b p\n5 . . . r . . . .\n4 . P . . . . . .\n3 . . Q . . . . P\n2 . . . . . P P .\n1 R . R . . . K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 5\nFullmove number: 31\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "1r6/q1pk1pp1/P3p1bp/3r4/1P6/2Q4P/5PP1/R1R3K1 w - - 5 31", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00952", "split": "perception", "task_type": "piece_id", "fen": "2r1k1r1/p2q1p1p/Q3pBp1/3pPn2/1p4P1/P1N5/1PP2P1P/R4RK1 b - - 0 21", "prompt": "FEN: 2r1k1r1/p2q1p1p/Q3pBp1/3pPn2/1p4P1/P1N5/1PP2P1P/R4RK1 b - - 0 21\nWhat piece is on g4?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "g4"}} {"example_id": "perception_00953", "split": "perception", "task_type": "material_count", "fen": "4r1k1/2P3p1/7p/5p1P/5P2/8/R1PK2P1/8 b - - 0 44", "prompt": "FEN: 4r1k1/2P3p1/7p/5p1P/5P2/8/R1PK2P1/8 b - - 0 44\nWhat is the material count for both sides?", "gold_answer": "White (7 pieces): 1 king, 5 pawns, 1 rook. Black (5 pieces): 1 king, 3 pawns, 1 rook. White is up 2 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00954", "split": "perception", "task_type": "square_lookup", "fen": "5k2/6r1/4Q3/8/8/8/6K1/8 w - -", "prompt": "FEN: 5k2/6r1/4Q3/8/8/8/6K1/8 w - -\nWhat is on d5?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "d5=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "d5", "diagnostic": true, "hard_gate": false, "square": "d5"}} {"example_id": "perception_00955", "split": "perception", "task_type": "rank_lookup", "fen": "r2q1rk1/p3bppp/2p1pn2/2pp4/5P2/1P1PPb1P/PBPN2P1/R2Q1RK1 w - -", "prompt": "FEN: r2q1rk1/p3bppp/2p1pn2/2pp4/5P2/1P1PPb1P/PBPN2P1/R2Q1RK1 w - -\nWhat is the compressed FEN row for rank 7?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 7: p3bppp", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "7", "_rank_lookup_row": "p3bppp", "diagnostic": true, "hard_gate": false, "rank": "7", "fen_rank_row": "p3bppp"}} {"example_id": "perception_00956", "split": "perception", "task_type": "square_coordinates", "fen": "5k1r/p1p2ppp/5n2/8/8/1nP1BB2/4KPPP/7R b - -", "prompt": "FEN: 5k1r/p1p2ppp/5n2/8/8/1nP1BB2/4KPPP/7R b - -\nFor square a7, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "a7: file=a; rank=7; fen_row_from_top=2; file_index=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "a7", "diagnostic": true, "hard_gate": false, "square": "a7"}} {"example_id": "perception_00957", "split": "perception", "task_type": "fen_rank_expansion", "fen": "7k/8/7P/7K/6P1/8/8/8 b - - 2 67", "prompt": "FEN: 7k/8/7P/7K/6P1/8/8/8 b - - 2 67\nCompressed rank 4 row: 6P1\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 4: a=1; b=1; c=1; d=1; e=1; f=1; g=P; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "4", "_fen_rank_expansion_row": "6P1", "diagnostic": true, "hard_gate": false, "rank": "4", "fen_rank_row": "6P1"}} {"example_id": "perception_00958", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "8/6p1/3kp1p1/6P1/3PK3/2P1P2P/8/8 w - - 1 45", "prompt": "Rank 3 row before: 2P1P2P\nFile c changes from P to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 3: 2P1P2P -> 4P2P", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "c3c4", "_fen_rank_cell_edit_square": "c3", "_fen_rank_cell_edit_rank": "3", "_fen_rank_cell_edit_file": "c", "_fen_rank_cell_edit_before_row": "2P1P2P", "_fen_rank_cell_edit_after_row": "4P2P", "_fen_rank_cell_edit_before_fen": "P", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "c3c4", "square": "c3", "rank": "3", "file": "c", "before_row": "2P1P2P", "after_row": "4P2P", "before_fen": "P", "after_fen": "1"}} {"example_id": "perception_00959", "split": "perception", "task_type": "fen_board_edit", "fen": "2r1r3/5kp1/b4p1p/p1p4R/2P5/3B4/PPK3PP/3R4 w - -", "prompt": "Board FEN before: 2r1r3/5kp1/b4p1p/p1p4R/2P5/3B4/PPK3PP/3R4\nApply square edits: d1 R->1; c1 1->R\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 2r1r3/5kp1/b4p1p/p1p4R/2P5/3B4/PPK3PP/2R5", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "d1c1", "_fen_board_edit_board_fen_before": "2r1r3/5kp1/b4p1p/p1p4R/2P5/3B4/PPK3PP/3R4", "_fen_board_edit_board_fen_after": "2r1r3/5kp1/b4p1p/p1p4R/2P5/3B4/PPK3PP/2R5", "_fen_board_edit_edit_text": "d1 R->1; c1 1->R", "_fen_board_edit_changed_squares": [{"square": "d1", "before": "white rook", "after": "empty", "before_fen": "R", "after_fen": "1"}, {"square": "c1", "before": "empty", "after": "white rook", "before_fen": "1", "after_fen": "R"}], "diagnostic": true, "hard_gate": false, "move": "d1c1", "board_fen_before": "2r1r3/5kp1/b4p1p/p1p4R/2P5/3B4/PPK3PP/3R4", "board_fen_after": "2r1r3/5kp1/b4p1p/p1p4R/2P5/3B4/PPK3PP/2R5", "edit_text": "d1 R->1; c1 1->R", "changed_squares": [{"square": "d1", "before": "white rook", "after": "empty", "before_fen": "R", "after_fen": "1"}, {"square": "c1", "before": "empty", "after": "white rook", "before_fen": "1", "after_fen": "R"}]}} {"example_id": "perception_00960", "split": "perception", "task_type": "move_square_edits", "fen": "8/2k5/2B5/2K5/8/1N6/8/8 b - -", "prompt": "Starting FEN: 8/2k5/2B5/2K5/8/1N6/8/8 b - -\nMove: c7d8\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: c7=black king; d8=empty.\nSquares: c7 black king->empty; d8 empty->black king.\nRanks: rank 7 c k->1; rank 8 d 1->k.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "c7d8", "diagnostic": true, "hard_gate": false, "move": "c7d8"}} {"example_id": "perception_00961", "split": "perception", "task_type": "fen_assembly", "fen": "3r2k1/5p2/2B3pp/p3p3/Pp1b4/3K3P/R5P1/8 b - - 1 37", "prompt": "Starting FEN: 3r2k1/5p2/2B3pp/p3p3/Pp1b4/3K3P/R5P1/8 b - - 1 37\nMove: e5e4\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 37\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black pawn e5e4.\nLookup: e5=black pawn; e4=empty.\nSquares: e5 black pawn->empty; e4 empty->black pawn.\nRanks: rank 5 e p->1; rank 4 e 1->p.\nResult FEN: 3r2k1/5p2/2B3pp/p7/Pp1bp3/3K3P/R5P1/8 w - - 0 38", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "e5e4", "diagnostic": true, "hard_gate": false, "move": "e5e4"}} {"example_id": "perception_00962", "split": "perception", "task_type": "fen_row_application", "fen": "rnbqk2r/pppp2pp/4p3/5p2/2PPn3/2P2NP1/P3PP1P/R1BQKB1R w KQkq -", "prompt": "Starting FEN: rnbqk2r/pppp2pp/4p3/5p2/2PPn3/2P2NP1/P3PP1P/R1BQKB1R w KQkq - 0 1\nMove: c1h6\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 1 R1BQKB1R->R2QKB1R; rank 6 4p3->4p2B.\nResult FEN: rnbqk2r/pppp2pp/4p2B/5p2/2PPn3/2P2NP1/P3PP1P/R2QKB1R b KQkq - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "c1h6", "_fen_row_application_rank_rewrites": [{"rank": "1", "before": "R1BQKB1R", "after": "R2QKB1R"}, {"rank": "6", "before": "4p3", "after": "4p2B"}], "diagnostic": true, "hard_gate": false, "move": "c1h6", "rank_rewrites": [{"rank": "1", "before": "R1BQKB1R", "after": "R2QKB1R"}, {"rank": "6", "before": "4p3", "after": "4p2B"}]}} {"example_id": "perception_00963", "split": "perception", "task_type": "state_tracking", "fen": "6k1/1p3p1p/2q5/p3Q1p1/2P5/PP2R2P/2P3P1/6K1 b - - 1 28", "prompt": "Starting FEN: 6k1/1p3p1p/2q5/p3Q1p1/2P5/PP2R2P/2P3P1/6K1 b - - 1 28\nAfter the moves c6b6, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 28\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 6k1/1p3p1p/1q6/p3Q1p1/2P5/PP2R2P/2P3P1/6K1 w - - 2 29", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "c6b6", "_state_tracking_result": "6k1/1p3p1p/1q6/p3Q1p1/2P5/PP2R2P/2P3P1/6K1 w - - 2 29"}} {"example_id": "perception_00964", "split": "perception", "task_type": "material_inventory", "fen": "2kr2nr/pbpq2bp/1p1p2p1/3Ppn2/2P1B3/2N2P2/PP2NBPP/R2Q1RK1 w - - 1 15", "prompt": "FEN: 2kr2nr/pbpq2bp/1p1p2p1/3Ppn2/2P1B3/2N2P2/PP2NBPP/R2Q1RK1 w - - 1 15\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=d1; rook=a1,f1; bishop=f2,e4; knight=e2,c3; pawn=a2,b2,g2,h2,f3,c4,d5.\nBlack inventory: king=c8; queen=d7; rook=d8,h8; bishop=b7,g7; knight=f5,g8; pawn=e5,b6,d6,g6,a7,c7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00965", "split": "perception", "task_type": "material_piece_counts", "fen": "2kr1bnr/pbq2ppp/1pn5/2p1p3/1P1pP3/P1NB1N2/1BPP1PPP/R2Q1RK1 w - - 0 10", "prompt": "FEN: 2kr1bnr/pbq2ppp/1pn5/2p1p3/1P1pP3/P1NB1N2/1BPP1PPP/R2Q1RK1 w - - 0 10\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=8.\nBlack counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=8.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00966", "split": "perception", "task_type": "material_value_totals", "fen": "r1bq1rk1/pp1nbppp/8/4p1P1/4P2P/2NP4/PP1Q4/R3KBNR b KQ - 0 13", "prompt": "FEN: r1bq1rk1/pp1nbppp/8/4p1P1/4P2P/2NP4/PP1Q4/R3KBNR b KQ - 0 13\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=3; knight=6; pawn=6; total=34.\nBlack values: king=0; queen=9; rook=10; bishop=6; knight=3; pawn=6; total=34.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00967", "split": "perception", "task_type": "material_balance_trace", "fen": "r1bq1rk1/p1b2ppp/2p5/2P1P3/3Pp3/4B3/P5PP/RN1Q1RK1 b - - 1 15", "prompt": "FEN: r1bq1rk1/p1b2ppp/2p5/2P1P3/3Pp3/4B3/P5PP/RN1Q1RK1 b - - 1 15\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=d1; rook=a1,f1; bishop=e3; knight=b1; pawn=a2,g2,h2,d4,c5,e5 | black king=g8; queen=d8; rook=a8,f8; bishop=c7,c8; knight=none; pawn=e4,c6,a7,f7,g7,h7\nCounts: white king=1; queen=1; rook=2; bishop=1; knight=1; pawn=6 | black king=1; queen=1; rook=2; bishop=2; knight=0; pawn=6\nValues: white total=31; black total=31\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00968", "split": "perception", "task_type": "multi_state_tracking", "fen": "rnbqkb1r/pp3ppp/3ppn2/2p3N1/2B1P3/2N5/PPPP1PPP/R1BQK2R b KQkq - 1 5", "prompt": "Starting FEN: rnbqkb1r/pp3ppp/3ppn2/2p3N1/2B1P3/2N5/PPPP1PPP/R1BQK2R b KQkq - 1 5\nAfter the moves a7a6 d1f3 a8a7, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 1\nFullmove number: 5\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 1nbqkb1r/rp3ppp/p2ppn2/2p3N1/2B1P3/2N2Q2/PPPP1PPP/R1B1K2R w KQk - 2 7", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "a7a6 d1f3 a8a7", "_multi_state_tracking_result": "1nbqkb1r/rp3ppp/p2ppn2/2p3N1/2B1P3/2N2Q2/PPPP1PPP/R1B1K2R w KQk - 2 7", "diagnostic": true, "hard_gate": false, "moves": "a7a6 d1f3 a8a7"}} {"example_id": "perception_00969", "split": "perception", "task_type": "board_print", "fen": "1rb2rk1/1p3ppp/p1n5/2qNp3/P3P3/2PP2P1/2P2PBP/1R1Q1RK1 w - - 6 20", "prompt": "Position (FEN): 1rb2rk1/1p3ppp/p1n5/2qNp3/P3P3/2PP2P1/2P2PBP/1R1Q1RK1 w - - 6 20\nShow me the board.", "gold_answer": "8 . r b . . r k .\n7 . p . . . p p p\n6 p . n . . . . .\n5 . . q N p . . .\n4 P . . . P . . .\n3 . . P P . . P .\n2 . . P . . P B P\n1 . R . Q . R K .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00970", "split": "perception", "task_type": "board_to_fen", "fen": "r2qk2r/1pp1b1pp/p2p1np1/3Pp3/2P1N3/1P2PQ1P/P4PP1/R1B1K2R b KQkq - 0 12", "prompt": "Here is the current board:\n8 r . . q k . . r\n7 . p p . b . p p\n6 p . . p . n p .\n5 . . . P p . . .\n4 . . P . N . . .\n3 . P . . P Q . P\n2 P . . . . P P .\n1 R . B . K . . R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 12\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r2qk2r/1pp1b1pp/p2p1np1/3Pp3/2P1N3/1P2PQ1P/P4PP1/R1B1K2R b KQkq - 0 12", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00971", "split": "perception", "task_type": "piece_id", "fen": "6k1/2r5/p4pNp/1p1p1p1P/1P1P1P2/4P3/1B1K3R/8 w - - 1 32", "prompt": "FEN: 6k1/2r5/p4pNp/1p1p1p1P/1P1P1P2/4P3/1B1K3R/8 w - - 1 32\nWhat piece is on b4?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "b4"}} {"example_id": "perception_00972", "split": "perception", "task_type": "material_count", "fen": "r1bq1rk1/1p2ppbp/n2p1np1/p7/3B4/1P2PNP1/P1PN1PBP/R2Q1RK1 b - - 0 10", "prompt": "FEN: r1bq1rk1/1p2ppbp/n2p1np1/p7/3B4/1P2PNP1/P1PN1PBP/R2Q1RK1 b - - 0 10\nWhat is the material count for both sides?", "gold_answer": "White (15 pieces): 2 bishops, 1 king, 2 knights, 7 pawns, 1 queen, 2 rooks. Black (15 pieces): 2 bishops, 1 king, 2 knights, 7 pawns, 1 queen, 2 rooks. Material is equal.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00973", "split": "perception", "task_type": "square_lookup", "fen": "rnbqkbnr/1pp2ppp/p2p4/3Pp3/4P3/2N2N1P/PPP2PP1/R1BQKB1R b KQkq - 0 6", "prompt": "FEN: rnbqkbnr/1pp2ppp/p2p4/3Pp3/4P3/2N2N1P/PPP2PP1/R1BQKB1R b KQkq - 0 6\nWhat is on d1?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "d1=white queen", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "d1", "diagnostic": true, "hard_gate": false, "square": "d1"}} {"example_id": "perception_00974", "split": "perception", "task_type": "rank_lookup", "fen": "5k1r/4b1p1/p2qQp1p/1p1p4/3P4/1P5P/P3RP1P/R5K1 w - - 6 28", "prompt": "FEN: 5k1r/4b1p1/p2qQp1p/1p1p4/3P4/1P5P/P3RP1P/R5K1 w - - 6 28\nWhat is the compressed FEN row for rank 3?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 3: 1P5P", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "3", "_rank_lookup_row": "1P5P", "diagnostic": true, "hard_gate": false, "rank": "3", "fen_rank_row": "1P5P"}} {"example_id": "perception_00975", "split": "perception", "task_type": "square_coordinates", "fen": "8/4bppk/2Q1pq1p/1rP5/3P4/R3B3/5PPP/5RK1 b - - 0 26", "prompt": "FEN: 8/4bppk/2Q1pq1p/1rP5/3P4/R3B3/5PPP/5RK1 b - - 0 26\nFor square d7, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "d7: file=d; rank=7; fen_row_from_top=2; file_index=4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "d7", "diagnostic": true, "hard_gate": false, "square": "d7"}} {"example_id": "perception_00976", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r2qk1nr/ppp2ppp/2n5/3pN3/Qb1P2b1/2N5/PP2PPPP/R1B1KB1R b KQkq -", "prompt": "FEN: r2qk1nr/ppp2ppp/2n5/3pN3/Qb1P2b1/2N5/PP2PPPP/R1B1KB1R b KQkq -\nCompressed rank 6 row: 2n5\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 6: a=1; b=1; c=n; d=1; e=1; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "6", "_fen_rank_expansion_row": "2n5", "diagnostic": true, "hard_gate": false, "rank": "6", "fen_rank_row": "2n5"}} {"example_id": "perception_00977", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "2r3k1/7p/6r1/p3Q3/3P1n2/P7/8/K5R1 w - - 4 39", "prompt": "Rank 6 row before: 6r1\nFile f changes from 1 to Q. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 6: 6r1 -> 5Qr1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "e5f6", "_fen_rank_cell_edit_square": "f6", "_fen_rank_cell_edit_rank": "6", "_fen_rank_cell_edit_file": "f", "_fen_rank_cell_edit_before_row": "6r1", "_fen_rank_cell_edit_after_row": "5Qr1", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "Q", "diagnostic": true, "hard_gate": false, "move": "e5f6", "square": "f6", "rank": "6", "file": "f", "before_row": "6r1", "after_row": "5Qr1", "before_fen": "1", "after_fen": "Q"}} {"example_id": "perception_00978", "split": "perception", "task_type": "fen_board_edit", "fen": "8/3Q4/4k3/4N3/1p6/p7/K7/4q3 b - -", "prompt": "Board FEN before: 8/3Q4/4k3/4N3/1p6/p7/K7/4q3\nApply square edits: e6 k->1; f6 1->k\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 8/3Q4/5k2/4N3/1p6/p7/K7/4q3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "e6f6", "_fen_board_edit_board_fen_before": "8/3Q4/4k3/4N3/1p6/p7/K7/4q3", "_fen_board_edit_board_fen_after": "8/3Q4/5k2/4N3/1p6/p7/K7/4q3", "_fen_board_edit_edit_text": "e6 k->1; f6 1->k", "_fen_board_edit_changed_squares": [{"square": "e6", "before": "black king", "after": "empty", "before_fen": "k", "after_fen": "1"}, {"square": "f6", "before": "empty", "after": "black king", "before_fen": "1", "after_fen": "k"}], "diagnostic": true, "hard_gate": false, "move": "e6f6", "board_fen_before": "8/3Q4/4k3/4N3/1p6/p7/K7/4q3", "board_fen_after": "8/3Q4/5k2/4N3/1p6/p7/K7/4q3", "edit_text": "e6 k->1; f6 1->k", "changed_squares": [{"square": "e6", "before": "black king", "after": "empty", "before_fen": "k", "after_fen": "1"}, {"square": "f6", "before": "empty", "after": "black king", "before_fen": "1", "after_fen": "k"}]}} {"example_id": "perception_00979", "split": "perception", "task_type": "move_square_edits", "fen": "1r2k3/p2n2p1/2p1ppp1/2Np2Pr/3P1P2/1P2P2P/P2K4/R6R b - - 1 21", "prompt": "Starting FEN: 1r2k3/p2n2p1/2p1ppp1/2Np2Pr/3P1P2/1P2P2P/P2K4/R6R b - - 1 21\nMove: h5h8\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: h5=black rook; h8=empty.\nSquares: h5 black rook->empty; h8 empty->black rook.\nRanks: rank 5 h r->1; rank 8 h 1->r.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "h5h8", "diagnostic": true, "hard_gate": false, "move": "h5h8"}} {"example_id": "perception_00980", "split": "perception", "task_type": "fen_assembly", "fen": "8/1p6/2b5/4k3/5nPp/1R3P1P/5R1K/r7 b - -", "prompt": "Starting FEN: 8/1p6/2b5/4k3/5nPp/1R3P1P/5R1K/r7 b - - 0 1\nMove: a1f1\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black rook a1f1.\nLookup: a1=black rook; f1=empty.\nSquares: a1 black rook->empty; f1 empty->black rook.\nRanks: rank 1 a r->1; rank 1 f 1->r.\nResult FEN: 8/1p6/2b5/4k3/5nPp/1R3P1P/5R1K/5r2 w - - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "a1f1", "diagnostic": true, "hard_gate": false, "move": "a1f1"}} {"example_id": "perception_00981", "split": "perception", "task_type": "fen_row_application", "fen": "1r6/4pqbk/pn1p2pp/1p6/3P1r1N/2PQ1N1P/PPB2P2/2KR4 w - -", "prompt": "Starting FEN: 1r6/4pqbk/pn1p2pp/1p6/3P1r1N/2PQ1N1P/PPB2P2/2KR4 w - - 0 1\nMove: h4g6\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 4 3P1r1N->3P1r2; rank 6 pn1p2pp->pn1p2Np.\nResult FEN: 1r6/4pqbk/pn1p2Np/1p6/3P1r2/2PQ1N1P/PPB2P2/2KR4 b - - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "h4g6", "_fen_row_application_rank_rewrites": [{"rank": "4", "before": "3P1r1N", "after": "3P1r2"}, {"rank": "6", "before": "pn1p2pp", "after": "pn1p2Np"}], "diagnostic": true, "hard_gate": false, "move": "h4g6", "rank_rewrites": [{"rank": "4", "before": "3P1r1N", "after": "3P1r2"}, {"rank": "6", "before": "pn1p2pp", "after": "pn1p2Np"}]}} {"example_id": "perception_00982", "split": "perception", "task_type": "state_tracking", "fen": "r4rk1/pp4pp/2pbbpn1/q1n1p3/1P2P3/2P1NNP1/P1Q2PBP/R1B1R1K1 b - -", "prompt": "Starting FEN: r4rk1/pp4pp/2pbbpn1/q1n1p3/1P2P3/2P1NNP1/P1Q2PBP/R1B1R1K1 b - - 0 1\nAfter the moves d6e7, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r4rk1/pp2b1pp/2p1bpn1/q1n1p3/1P2P3/2P1NNP1/P1Q2PBP/R1B1R1K1 w - - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "d6e7", "_state_tracking_result": "r4rk1/pp2b1pp/2p1bpn1/q1n1p3/1P2P3/2P1NNP1/P1Q2PBP/R1B1R1K1 w - - 1 2"}} {"example_id": "perception_00983", "split": "perception", "task_type": "material_inventory", "fen": "8/8/8/p1p5/1pPpk3/1P6/P3K3/8 b - - 3 52", "prompt": "FEN: 8/8/8/p1p5/1pPpk3/1P6/P3K3/8 b - - 3 52\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=e2; queen=none; rook=none; bishop=none; knight=none; pawn=a2,b3,c4.\nBlack inventory: king=e4; queen=none; rook=none; bishop=none; knight=none; pawn=b4,d4,a5,c5.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00984", "split": "perception", "task_type": "material_piece_counts", "fen": "r3r1k1/p4p2/5n1p/3pbq2/2p5/2N4P/PP1Q1PP1/R3R1K1 b - - 3 22", "prompt": "FEN: r3r1k1/p4p2/5n1p/3pbq2/2p5/2N4P/PP1Q1PP1/R3R1K1 b - - 3 22\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=0; knight=1; pawn=5.\nBlack counts: king=1; queen=1; rook=2; bishop=1; knight=1; pawn=5.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00985", "split": "perception", "task_type": "material_value_totals", "fen": "r2q1rk1/pp3pbp/2n1pn2/3p1p2/3P1B2/2P2N1P/PP3PP1/RN1QR1K1 w - -", "prompt": "FEN: r2q1rk1/pp3pbp/2n1pn2/3p1p2/3P1B2/2P2N1P/PP3PP1/RN1QR1K1 w - -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=3; knight=6; pawn=7; total=35.\nBlack values: king=0; queen=9; rook=10; bishop=3; knight=6; pawn=7; total=35.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00986", "split": "perception", "task_type": "material_balance_trace", "fen": "rnbq1rk1/ppp2pbp/3p1np1/4p1B1/4P3/2NP1N2/PPP1BPPP/R2Q1RK1 b - -", "prompt": "FEN: rnbq1rk1/ppp2pbp/3p1np1/4p1B1/4P3/2NP1N2/PPP1BPPP/R2Q1RK1 b - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=d1; rook=a1,f1; bishop=e2,g5; knight=c3,f3; pawn=a2,b2,c2,f2,g2,h2,d3,e4 | black king=g8; queen=d8; rook=a8,f8; bishop=g7,c8; knight=f6,b8; pawn=e5,d6,g6,a7,b7,c7,f7,h7\nCounts: white king=1; queen=1; rook=2; bishop=2; knight=2; pawn=8 | black king=1; queen=1; rook=2; bishop=2; knight=2; pawn=8\nValues: white total=39; black total=39\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_00987", "split": "perception", "task_type": "multi_state_tracking", "fen": "r4rk1/1ppb2pp/p2bpq2/3p1p2/3P4/4P1N1/PPP2PPP/R2QKB1R w KQ - 4 11", "prompt": "Starting FEN: r4rk1/1ppb2pp/p2bpq2/3p1p2/3P4/4P1N1/PPP2PPP/R2QKB1R w KQ - 4 11\nAfter the moves h1g1 d6b4, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 4\nFullmove number: 11\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r4rk1/1ppb2pp/p3pq2/3p1p2/1b1P4/4P1N1/PPP2PPP/R2QKBR1 w Q - 6 12", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "h1g1 d6b4", "_multi_state_tracking_result": "r4rk1/1ppb2pp/p3pq2/3p1p2/1b1P4/4P1N1/PPP2PPP/R2QKBR1 w Q - 6 12", "diagnostic": true, "hard_gate": false, "moves": "h1g1 d6b4"}} {"example_id": "perception_00988", "split": "perception", "task_type": "board_print", "fen": "2r2k2/5p2/p6r/6p1/2nPR2p/2P3q1/1P4N1/2R1Q1K1 w - - 0 38", "prompt": "Position (FEN): 2r2k2/5p2/p6r/6p1/2nPR2p/2P3q1/1P4N1/2R1Q1K1 w - - 0 38\nShow me the board.", "gold_answer": "8 . . r . . k . .\n7 . . . . . p . .\n6 p . . . . . . r\n5 . . . . . . p .\n4 . . n P R . . p\n3 . . P . . . q .\n2 . P . . . . N .\n1 . . R . Q . K .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_00989", "split": "perception", "task_type": "board_to_fen", "fen": "rn1qk2r/pb1pbppp/1p2pn2/2p5/2P5/1P2PN2/PB1PBPPP/RN1QK2R w KQkq -", "prompt": "Here is the current board:\n8 r n . q k . . r\n7 p b . p b p p p\n6 . p . . p n . .\n5 . . p . . . . .\n4 . . P . . . . .\n3 . P . . P N . .\n2 P B . P B P P P\n1 R N . Q K . . R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "rn1qk2r/pb1pbppp/1p2pn2/2p5/2P5/1P2PN2/PB1PBPPP/RN1QK2R w KQkq - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00990", "split": "perception", "task_type": "piece_id", "fen": "r2qrbk1/1b3p2/p1n2npp/1P1pp3/1P2P3/3P1NN1/2BB1PPP/R2QR1K1 b - -", "prompt": "FEN: r2qrbk1/1b3p2/p1n2npp/1P1pp3/1P2P3/3P1NN1/2BB1PPP/R2QR1K1 b - -\nWhat piece is on d8?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black queen", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "d8"}} {"example_id": "perception_00991", "split": "perception", "task_type": "material_count", "fen": "8/5p2/5b1p/3k4/3P1PPP/4K3/8/8 b - -", "prompt": "FEN: 8/5p2/5b1p/3k4/3P1PPP/4K3/8/8 b - -\nWhat is the material count for both sides?", "gold_answer": "White (5 pieces): 1 king, 4 pawns. Black (4 pieces): 1 bishop, 1 king, 2 pawns. Black is up 1 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_00992", "split": "perception", "task_type": "square_lookup", "fen": "2K5/7q/4k3/8/8/8/8/8 b - - 23 91", "prompt": "FEN: 2K5/7q/4k3/8/8/8/8/8 b - - 23 91\nWhat is on f3?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "f3=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "f3", "diagnostic": true, "hard_gate": false, "square": "f3"}} {"example_id": "perception_00993", "split": "perception", "task_type": "rank_lookup", "fen": "r3kbnr/ppp2ppp/2n5/4p2q/6b1/2NP1N2/PPP1BPPP/R1BQK2R w KQkq -", "prompt": "FEN: r3kbnr/ppp2ppp/2n5/4p2q/6b1/2NP1N2/PPP1BPPP/R1BQK2R w KQkq -\nWhat is the compressed FEN row for rank 7?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 7: ppp2ppp", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "7", "_rank_lookup_row": "ppp2ppp", "diagnostic": true, "hard_gate": false, "rank": "7", "fen_rank_row": "ppp2ppp"}} {"example_id": "perception_00994", "split": "perception", "task_type": "square_coordinates", "fen": "R6R/8/8/1k6/p7/6P1/P2BrPKP/8 w - - 5 41", "prompt": "FEN: R6R/8/8/1k6/p7/6P1/P2BrPKP/8 w - - 5 41\nFor square f4, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "f4: file=f; rank=4; fen_row_from_top=5; file_index=6", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "f4", "diagnostic": true, "hard_gate": false, "square": "f4"}} {"example_id": "perception_00995", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r2q1rk1/1ppnppbp/3p2p1/p2P4/PnP5/1PN2BP1/1B2PP1P/R2Q1RK1 w - -", "prompt": "FEN: r2q1rk1/1ppnppbp/3p2p1/p2P4/PnP5/1PN2BP1/1B2PP1P/R2Q1RK1 w - -\nCompressed rank 7 row: 1ppnppbp\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 7: a=1; b=p; c=p; d=n; e=p; f=p; g=b; h=p", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "7", "_fen_rank_expansion_row": "1ppnppbp", "diagnostic": true, "hard_gate": false, "rank": "7", "fen_rank_row": "1ppnppbp"}} {"example_id": "perception_00996", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r2qk2r/2p1bppp/p3b3/1p6/1P1BQP2/P1N1P3/6PP/R3K2R w KQkq -", "prompt": "Rank 5 row before: 1p6\nFile b changes from p to N. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 5: 1p6 -> 1N6", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "c3b5", "_fen_rank_cell_edit_square": "b5", "_fen_rank_cell_edit_rank": "5", "_fen_rank_cell_edit_file": "b", "_fen_rank_cell_edit_before_row": "1p6", "_fen_rank_cell_edit_after_row": "1N6", "_fen_rank_cell_edit_before_fen": "p", "_fen_rank_cell_edit_after_fen": "N", "diagnostic": true, "hard_gate": false, "move": "c3b5", "square": "b5", "rank": "5", "file": "b", "before_row": "1p6", "after_row": "1N6", "before_fen": "p", "after_fen": "N"}} {"example_id": "perception_00997", "split": "perception", "task_type": "fen_board_edit", "fen": "6k1/6pp/p7/3rp3/P3P3/2K1n3/8/8 w - - 0 39", "prompt": "Board FEN before: 6k1/6pp/p7/3rp3/P3P3/2K1n3/8/8\nApply square edits: a4 P->1; a5 1->P\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 6k1/6pp/p7/P2rp3/4P3/2K1n3/8/8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "a4a5", "_fen_board_edit_board_fen_before": "6k1/6pp/p7/3rp3/P3P3/2K1n3/8/8", "_fen_board_edit_board_fen_after": "6k1/6pp/p7/P2rp3/4P3/2K1n3/8/8", "_fen_board_edit_edit_text": "a4 P->1; a5 1->P", "_fen_board_edit_changed_squares": [{"square": "a4", "before": "white pawn", "after": "empty", "before_fen": "P", "after_fen": "1"}, {"square": "a5", "before": "empty", "after": "white pawn", "before_fen": "1", "after_fen": "P"}], "diagnostic": true, "hard_gate": false, "move": "a4a5", "board_fen_before": "6k1/6pp/p7/3rp3/P3P3/2K1n3/8/8", "board_fen_after": "6k1/6pp/p7/P2rp3/4P3/2K1n3/8/8", "edit_text": "a4 P->1; a5 1->P", "changed_squares": [{"square": "a4", "before": "white pawn", "after": "empty", "before_fen": "P", "after_fen": "1"}, {"square": "a5", "before": "empty", "after": "white pawn", "before_fen": "1", "after_fen": "P"}]}} {"example_id": "perception_00998", "split": "perception", "task_type": "move_square_edits", "fen": "r2qk2r/1p1b1p2/3p4/p1pN2p1/P1PpP2p/1P1P1P2/2K1B1PP/1R3R2 b kq - 3 24", "prompt": "Starting FEN: r2qk2r/1p1b1p2/3p4/p1pN2p1/P1PpP2p/1P1P1P2/2K1B1PP/1R3R2 b kq - 3 24\nMove: h8f8\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: h8=black rook; f8=empty.\nSquares: h8 black rook->empty; f8 empty->black rook.\nRanks: rank 8 h r->1; rank 8 f 1->r.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "h8f8", "diagnostic": true, "hard_gate": false, "move": "h8f8"}} {"example_id": "perception_00999", "split": "perception", "task_type": "fen_assembly", "fen": "2k4r/pp3ppp/1b6/4pP2/q1p1P3/2PrB3/1Q2R1PP/1R5K b - - 3 23", "prompt": "Starting FEN: 2k4r/pp3ppp/1b6/4pP2/q1p1P3/2PrB3/1Q2R1PP/1R5K b - - 3 23\nMove: a7a6\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 3\nFullmove number: 23\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black pawn a7a6.\nLookup: a7=black pawn; a6=empty.\nSquares: a7 black pawn->empty; a6 empty->black pawn.\nRanks: rank 7 a p->1; rank 6 a 1->p.\nResult FEN: 2k4r/1p3ppp/pb6/4pP2/q1p1P3/2PrB3/1Q2R1PP/1R5K w - - 0 24", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "a7a6", "diagnostic": true, "hard_gate": false, "move": "a7a6"}} {"example_id": "perception_01000", "split": "perception", "task_type": "fen_row_application", "fen": "6k1/p3K1Pp/7q/P7/8/5b2/8/8 w - - 0 53", "prompt": "Starting FEN: 6k1/p3K1Pp/7q/P7/8/5b2/8/8 w - - 0 53\nMove: e7e8\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 53\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 7 p3K1Pp->p5Pp; rank 8 6k1->4K1k1.\nResult FEN: 4K1k1/p5Pp/7q/P7/8/5b2/8/8 b - - 1 53", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "e7e8", "_fen_row_application_rank_rewrites": [{"rank": "7", "before": "p3K1Pp", "after": "p5Pp"}, {"rank": "8", "before": "6k1", "after": "4K1k1"}], "diagnostic": true, "hard_gate": false, "move": "e7e8", "rank_rewrites": [{"rank": "7", "before": "p3K1Pp", "after": "p5Pp"}, {"rank": "8", "before": "6k1", "after": "4K1k1"}]}} {"example_id": "perception_01001", "split": "perception", "task_type": "state_tracking", "fen": "5rk1/n1r2ppp/1p1p2q1/p7/4P3/R1B2P2/1PP2QPP/4R1K1 b - - 7 23", "prompt": "Starting FEN: 5rk1/n1r2ppp/1p1p2q1/p7/4P3/R1B2P2/1PP2QPP/4R1K1 b - - 7 23\nAfter the moves g6f6, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 7\nFullmove number: 23\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 5rk1/n1r2ppp/1p1p1q2/p7/4P3/R1B2P2/1PP2QPP/4R1K1 w - - 8 24", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "g6f6", "_state_tracking_result": "5rk1/n1r2ppp/1p1p1q2/p7/4P3/R1B2P2/1PP2QPP/4R1K1 w - - 8 24"}} {"example_id": "perception_01002", "split": "perception", "task_type": "material_inventory", "fen": "r2q3r/p1pkpQ1p/8/1p1p4/4b1P1/2N3PP/PP1K1R2/nN6 b - - 1 16", "prompt": "FEN: r2q3r/p1pkpQ1p/8/1p1p4/4b1P1/2N3PP/PP1K1R2/nN6 b - - 1 16\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=d2; queen=f7; rook=f2; bishop=none; knight=b1,c3; pawn=a2,b2,g3,h3,g4.\nBlack inventory: king=d7; queen=d8; rook=a8,h8; bishop=e4; knight=a1; pawn=b5,d5,a7,c7,e7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01003", "split": "perception", "task_type": "material_piece_counts", "fen": "rn1qkb1r/1bp1pppp/p4n2/1p6/3P4/3BPN2/PP3PPP/RNBQK2R w KQkq -", "prompt": "FEN: rn1qkb1r/1bp1pppp/p4n2/1p6/3P4/3BPN2/PP3PPP/RNBQK2R w KQkq -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7.\nBlack counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01004", "split": "perception", "task_type": "material_value_totals", "fen": "1k1r4/2p5/2p2p2/1P6/P1P1pPr1/3pP3/5P1P/R2R1K2 b - -", "prompt": "FEN: 1k1r4/2p5/2p2p2/1P6/P1P1pPr1/3pP3/5P1P/R2R1K2 b - -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=10; bishop=0; knight=0; pawn=7; total=17.\nBlack values: king=0; queen=0; rook=10; bishop=0; knight=0; pawn=5; total=15.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01005", "split": "perception", "task_type": "material_balance_trace", "fen": "5k2/p3Npr1/1p5Q/4p3/2p1P3/b2P4/2R2PPP/5RK1 w - - 0 29", "prompt": "FEN: 5k2/p3Npr1/1p5Q/4p3/2p1P3/b2P4/2R2PPP/5RK1 w - - 0 29\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=h6; rook=f1,c2; bishop=none; knight=e7; pawn=f2,g2,h2,d3,e4 | black king=f8; queen=none; rook=g7; bishop=a3; knight=none; pawn=c4,e5,b6,a7,f7\nCounts: white king=1; queen=1; rook=2; bishop=0; knight=1; pawn=5 | black king=1; queen=0; rook=1; bishop=1; knight=0; pawn=5\nValues: white total=27; black total=13\nBalance: White is up 14 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01006", "split": "perception", "task_type": "multi_state_tracking", "fen": "3k4/2R5/2P3pp/5p2/5P1K/2r3PP/8/8 w - - 2 38", "prompt": "Starting FEN: 3k4/2R5/2P3pp/5p2/5P1K/2r3PP/8/8 w - - 2 38\nAfter the moves c7h7 c3f3, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 2\nFullmove number: 38\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 3k4/7R/2P3pp/5p2/5P1K/5rPP/8/8 w - - 4 39", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "c7h7 c3f3", "_multi_state_tracking_result": "3k4/7R/2P3pp/5p2/5P1K/5rPP/8/8 w - - 4 39", "diagnostic": true, "hard_gate": false, "moves": "c7h7 c3f3"}} {"example_id": "perception_01007", "split": "perception", "task_type": "board_print", "fen": "8/p2b1pk1/4p1p1/8/1N6/P7/1P1K3P/8 w - -", "prompt": "Position (FEN): 8/p2b1pk1/4p1p1/8/1N6/P7/1P1K3P/8 w - -\nShow me the board.", "gold_answer": "8 . . . . . . . .\n7 p . . b . p k .\n6 . . . . p . p .\n5 . . . . . . . .\n4 . N . . . . . .\n3 P . . . . . . .\n2 . P . K . . . P\n1 . . . . . . . .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01008", "split": "perception", "task_type": "board_to_fen", "fen": "r3kbnr/pppq1ppp/2n1p3/1B1p1b2/3P1B2/4PN2/PPP2PPP/RN1QK2R w KQkq - 2 6", "prompt": "Here is the current board:\n8 r . . . k b n r\n7 p p p q . p p p\n6 . . n . p . . .\n5 . B . p . b . .\n4 . . . P . B . .\n3 . . . . P N . .\n2 P P P . . P P P\n1 R N . Q K . . R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 2\nFullmove number: 6\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r3kbnr/pppq1ppp/2n1p3/1B1p1b2/3P1B2/4PN2/PPP2PPP/RN1QK2R w KQkq - 2 6", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01009", "split": "perception", "task_type": "piece_id", "fen": "rnb1kbnr/ppp2ppp/8/4p3/4P3/8/PPP1NPPP/RNBqKB1R w KQkq -", "prompt": "FEN: rnb1kbnr/ppp2ppp/8/4p3/4P3/8/PPP1NPPP/RNBqKB1R w KQkq -\nWhat piece is on d1?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black queen", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "d1"}} {"example_id": "perception_01010", "split": "perception", "task_type": "material_count", "fen": "r1b1k2r/p2n1ppp/1pn1p3/1B2P3/1b6/2N2N2/PP4PP/R1BK3R b kq - 2 12", "prompt": "FEN: r1b1k2r/p2n1ppp/1pn1p3/1B2P3/1b6/2N2N2/PP4PP/R1BK3R b kq - 2 12\nWhat is the material count for both sides?", "gold_answer": "White (12 pieces): 2 bishops, 1 king, 2 knights, 5 pawns, 2 rooks. Black (13 pieces): 2 bishops, 1 king, 2 knights, 6 pawns, 2 rooks. Black is up 1 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01011", "split": "perception", "task_type": "square_lookup", "fen": "r1bqk1nr/pppn1p1p/6p1/4b3/2P1P3/2N5/PP4PP/R1BQKBNR w KQkq -", "prompt": "FEN: r1bqk1nr/pppn1p1p/6p1/4b3/2P1P3/2N5/PP4PP/R1BQKBNR w KQkq -\nWhat is on b3?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "b3=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "b3", "diagnostic": true, "hard_gate": false, "square": "b3"}} {"example_id": "perception_01012", "split": "perception", "task_type": "rank_lookup", "fen": "r6r/3knpb1/3p1p1p/p1pPp3/Pp2P3/1P1P1NP1/5P1P/R3KB1R w KQ - 0 17", "prompt": "FEN: r6r/3knpb1/3p1p1p/p1pPp3/Pp2P3/1P1P1NP1/5P1P/R3KB1R w KQ - 0 17\nWhat is the compressed FEN row for rank 8?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 8: r6r", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "8", "_rank_lookup_row": "r6r", "diagnostic": true, "hard_gate": false, "rank": "8", "fen_rank_row": "r6r"}} {"example_id": "perception_01013", "split": "perception", "task_type": "square_coordinates", "fen": "2r3rk/p5pp/bq5N/2b1p3/3nP3/4B2P/P4PP1/6K1 w - -", "prompt": "FEN: 2r3rk/p5pp/bq5N/2b1p3/3nP3/4B2P/P4PP1/6K1 w - -\nFor square e5, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "e5: file=e; rank=5; fen_row_from_top=4; file_index=5", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "e5", "diagnostic": true, "hard_gate": false, "square": "e5"}} {"example_id": "perception_01014", "split": "perception", "task_type": "fen_rank_expansion", "fen": "1r3rk1/p6p/4pp2/4q1P1/2Qp1n2/3P4/PP1B2P1/R2K3R w - - 0 23", "prompt": "FEN: 1r3rk1/p6p/4pp2/4q1P1/2Qp1n2/3P4/PP1B2P1/R2K3R w - - 0 23\nCompressed rank 1 row: R2K3R\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 1: a=R; b=1; c=1; d=K; e=1; f=1; g=1; h=R", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "1", "_fen_rank_expansion_row": "R2K3R", "diagnostic": true, "hard_gate": false, "rank": "1", "fen_rank_row": "R2K3R"}} {"example_id": "perception_01015", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r2b2rk/p1q2p1p/4p3/1p1pPp1Q/3P4/2P2N2/PP4PP/R4R1K w - -", "prompt": "Rank 6 row before: 4p3\nFile h changes from 1 to Q. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 6: 4p3 -> 4p2Q", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "h5h6", "_fen_rank_cell_edit_square": "h6", "_fen_rank_cell_edit_rank": "6", "_fen_rank_cell_edit_file": "h", "_fen_rank_cell_edit_before_row": "4p3", "_fen_rank_cell_edit_after_row": "4p2Q", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "Q", "diagnostic": true, "hard_gate": false, "move": "h5h6", "square": "h6", "rank": "6", "file": "h", "before_row": "4p3", "after_row": "4p2Q", "before_fen": "1", "after_fen": "Q"}} {"example_id": "perception_01016", "split": "perception", "task_type": "fen_board_edit", "fen": "6k1/2p2pp1/2n1p2p/2P1P3/6r1/Q6K/5P1P/3q2R1 b - - 3 30", "prompt": "Board FEN before: 6k1/2p2pp1/2n1p2p/2P1P3/6r1/Q6K/5P1P/3q2R1\nApply square edits: c6 n->1; d8 1->n\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 3n2k1/2p2pp1/4p2p/2P1P3/6r1/Q6K/5P1P/3q2R1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "c6d8", "_fen_board_edit_board_fen_before": "6k1/2p2pp1/2n1p2p/2P1P3/6r1/Q6K/5P1P/3q2R1", "_fen_board_edit_board_fen_after": "3n2k1/2p2pp1/4p2p/2P1P3/6r1/Q6K/5P1P/3q2R1", "_fen_board_edit_edit_text": "c6 n->1; d8 1->n", "_fen_board_edit_changed_squares": [{"square": "c6", "before": "black knight", "after": "empty", "before_fen": "n", "after_fen": "1"}, {"square": "d8", "before": "empty", "after": "black knight", "before_fen": "1", "after_fen": "n"}], "diagnostic": true, "hard_gate": false, "move": "c6d8", "board_fen_before": "6k1/2p2pp1/2n1p2p/2P1P3/6r1/Q6K/5P1P/3q2R1", "board_fen_after": "3n2k1/2p2pp1/4p2p/2P1P3/6r1/Q6K/5P1P/3q2R1", "edit_text": "c6 n->1; d8 1->n", "changed_squares": [{"square": "c6", "before": "black knight", "after": "empty", "before_fen": "n", "after_fen": "1"}, {"square": "d8", "before": "empty", "after": "black knight", "before_fen": "1", "after_fen": "n"}]}} {"example_id": "perception_01017", "split": "perception", "task_type": "move_square_edits", "fen": "r1bqk1nr/1p1nbp1p/4p1p1/pP1pP3/6Q1/P4N2/2P2PPP/RNB1KB1R w KQkq -", "prompt": "Starting FEN: r1bqk1nr/1p1nbp1p/4p1p1/pP1pP3/6Q1/P4N2/2P2PPP/RNB1KB1R w KQkq -\nMove: f3g1\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: f3=white knight; g1=empty.\nSquares: f3 white knight->empty; g1 empty->white knight.\nRanks: rank 3 f N->1; rank 1 g 1->N.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "f3g1", "diagnostic": true, "hard_gate": false, "move": "f3g1"}} {"example_id": "perception_01018", "split": "perception", "task_type": "fen_assembly", "fen": "r1bq1r1k/ppp1n1pp/1b1P4/6p1/4R3/1QN2N1P/PP3PP1/R5K1 w - -", "prompt": "Starting FEN: r1bq1r1k/ppp1n1pp/1b1P4/6p1/4R3/1QN2N1P/PP3PP1/R5K1 w - - 0 1\nMove: c3a4\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white knight c3a4.\nLookup: c3=white knight; a4=empty.\nSquares: c3 white knight->empty; a4 empty->white knight.\nRanks: rank 3 c N->1; rank 4 a 1->N.\nResult FEN: r1bq1r1k/ppp1n1pp/1b1P4/6p1/N3R3/1Q3N1P/PP3PP1/R5K1 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "c3a4", "diagnostic": true, "hard_gate": false, "move": "c3a4"}} {"example_id": "perception_01019", "split": "perception", "task_type": "fen_row_application", "fen": "4r1rk/6pp/pN1p4/1p1R4/5P2/1Q2BK2/PPP4q/8 b - - 2 32", "prompt": "Starting FEN: 4r1rk/6pp/pN1p4/1p1R4/5P2/1Q2BK2/PPP4q/8 b - - 2 32\nMove: h2h6\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 2\nFullmove number: 32\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 2 PPP4q->PPP5; rank 6 pN1p4->pN1p3q.\nResult FEN: 4r1rk/6pp/pN1p3q/1p1R4/5P2/1Q2BK2/PPP5/8 w - - 3 33", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "h2h6", "_fen_row_application_rank_rewrites": [{"rank": "2", "before": "PPP4q", "after": "PPP5"}, {"rank": "6", "before": "pN1p4", "after": "pN1p3q"}], "diagnostic": true, "hard_gate": false, "move": "h2h6", "rank_rewrites": [{"rank": "2", "before": "PPP4q", "after": "PPP5"}, {"rank": "6", "before": "pN1p4", "after": "pN1p3q"}]}} {"example_id": "perception_01020", "split": "perception", "task_type": "state_tracking", "fen": "rn2q1k1/p4p1p/1pp3p1/3n2N1/3P2b1/1BP5/P2B1PPP/1R2K2R w K - 0 18", "prompt": "Starting FEN: rn2q1k1/p4p1p/1pp3p1/3n2N1/3P2b1/1BP5/P2B1PPP/1R2K2R w K - 0 18\nAfter the moves g5e6, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: K\nEn passant: none\nHalfmove clock: 0\nFullmove number: 18\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rn2q1k1/p4p1p/1pp1N1p1/3n4/3P2b1/1BP5/P2B1PPP/1R2K2R b K - 1 18", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "g5e6", "_state_tracking_result": "rn2q1k1/p4p1p/1pp1N1p1/3n4/3P2b1/1BP5/P2B1PPP/1R2K2R b K - 1 18"}} {"example_id": "perception_01021", "split": "perception", "task_type": "material_inventory", "fen": "r6r/ppkn1P1p/8/3p4/1PpP2p1/6P1/PP1N3P/R4RK1 w - - 1 23", "prompt": "FEN: r6r/ppkn1P1p/8/3p4/1PpP2p1/6P1/PP1N3P/R4RK1 w - - 1 23\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=none; rook=a1,f1; bishop=none; knight=d2; pawn=a2,b2,h2,g3,b4,d4,f7.\nBlack inventory: king=c7; queen=none; rook=a8,h8; bishop=none; knight=d7; pawn=c4,g4,d5,a7,b7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01022", "split": "perception", "task_type": "material_piece_counts", "fen": "rn2k1nr/1b1p2pp/p2bp3/1p2Npq1/3P4/3BP3/PP1B1PPP/RN1Q1RK1 w kq - 2 12", "prompt": "FEN: rn2k1nr/1b1p2pp/p2bp3/1p2Npq1/3P4/3BP3/PP1B1PPP/RN1Q1RK1 w kq - 2 12\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7.\nBlack counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01023", "split": "perception", "task_type": "material_value_totals", "fen": "rn1qk2r/1p3ppp/p2pbn2/2b1p3/2P5/2NBP3/PPQ1NPPP/R1B1K2R b KQkq - 3 8", "prompt": "FEN: rn1qk2r/1p3ppp/p2pbn2/2b1p3/2P5/2NBP3/PPQ1NPPP/R1B1K2R b KQkq - 3 8\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=7; total=38.\nBlack values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=7; total=38.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01024", "split": "perception", "task_type": "material_balance_trace", "fen": "2k5/1p3p2/5p2/3r1P2/3p4/3PpKB1/2P5/5R2 w - -", "prompt": "FEN: 2k5/1p3p2/5p2/3r1P2/3p4/3PpKB1/2P5/5R2 w - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=f3; queen=none; rook=f1; bishop=g3; knight=none; pawn=c2,d3,f5 | black king=c8; queen=none; rook=d5; bishop=none; knight=none; pawn=e3,d4,f6,b7,f7\nCounts: white king=1; queen=0; rook=1; bishop=1; knight=0; pawn=3 | black king=1; queen=0; rook=1; bishop=0; knight=0; pawn=5\nValues: white total=11; black total=10\nBalance: White is up 1 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01025", "split": "perception", "task_type": "multi_state_tracking", "fen": "r2q2k1/ppp2pp1/3pr2p/3n3Q/4PR2/P2P4/1PP3PP/R5K1 w - - 0 17", "prompt": "Starting FEN: r2q2k1/ppp2pp1/3pr2p/3n3Q/4PR2/P2P4/1PP3PP/R5K1 w - - 0 17\nAfter the moves a3a4 d5c3, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 17\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r2q2k1/ppp2pp1/3pr2p/7Q/P3PR2/2nP4/1PP3PP/R5K1 w - - 1 18", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "a3a4 d5c3", "_multi_state_tracking_result": "r2q2k1/ppp2pp1/3pr2p/7Q/P3PR2/2nP4/1PP3PP/R5K1 w - - 1 18", "diagnostic": true, "hard_gate": false, "moves": "a3a4 d5c3"}} {"example_id": "perception_01026", "split": "perception", "task_type": "board_print", "fen": "rn2k1nr/1bqp1ppp/ppp1p3/8/1bPPP3/2N1B3/PP1QBPPP/2KR2NR b kq - 5 8", "prompt": "Position (FEN): rn2k1nr/1bqp1ppp/ppp1p3/8/1bPPP3/2N1B3/PP1QBPPP/2KR2NR b kq - 5 8\nShow me the board.", "gold_answer": "8 r n . . k . n r\n7 . b q p . p p p\n6 p p p . p . . .\n5 . . . . . . . .\n4 . b P P P . . .\n3 . . N . B . . .\n2 P P . Q B P P P\n1 . . K R . . N R\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01027", "split": "perception", "task_type": "board_to_fen", "fen": "rnb2rk1/ppb2pp1/2p1pq1p/2Pp4/1P1P4/P4N1P/4PPP1/RN1QKB1R w KQ - 0 10", "prompt": "Here is the current board:\n8 r n b . . r k .\n7 p p b . . p p .\n6 . . p . p q . p\n5 . . P p . . . .\n4 . P . P . . . .\n3 P . . . . N . P\n2 . . . . P P P .\n1 R N . Q K B . R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 0\nFullmove number: 10\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "rnb2rk1/ppb2pp1/2p1pq1p/2Pp4/1P1P4/P4N1P/4PPP1/RN1QKB1R w KQ - 0 10", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01028", "split": "perception", "task_type": "piece_id", "fen": "8/8/8/8/3Q4/2K5/6k1/8 b - -", "prompt": "FEN: 8/8/8/8/3Q4/2K5/6k1/8 b - -\nWhat piece is on d4?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white queen", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "d4"}} {"example_id": "perception_01029", "split": "perception", "task_type": "material_count", "fen": "7k/1pp3pp/p7/2P3K1/6PP/P2pP3/8/5r2 b - - 0 37", "prompt": "FEN: 7k/1pp3pp/p7/2P3K1/6PP/P2pP3/8/5r2 b - - 0 37\nWhat is the material count for both sides?", "gold_answer": "White (6 pieces): 1 king, 5 pawns. Black (8 pieces): 1 king, 6 pawns, 1 rook. Black is up 6 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01030", "split": "perception", "task_type": "square_lookup", "fen": "4k2r/1b2bppp/pN1p4/5P2/4n1q1/1PN5/P2R2PP/R1B3K1 w - - 3 21", "prompt": "FEN: 4k2r/1b2bppp/pN1p4/5P2/4n1q1/1PN5/P2R2PP/R1B3K1 w - - 3 21\nWhat is on e3?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "e3=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "e3", "diagnostic": true, "hard_gate": false, "square": "e3"}} {"example_id": "perception_01031", "split": "perception", "task_type": "rank_lookup", "fen": "r1b2rk1/pp4p1/4p2p/3pnpNQ/3q3R/P2B4/2P3PP/1R5K b - - 1 19", "prompt": "FEN: r1b2rk1/pp4p1/4p2p/3pnpNQ/3q3R/P2B4/2P3PP/1R5K b - - 1 19\nWhat is the compressed FEN row for rank 3?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 3: P2B4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "3", "_rank_lookup_row": "P2B4", "diagnostic": true, "hard_gate": false, "rank": "3", "fen_rank_row": "P2B4"}} {"example_id": "perception_01032", "split": "perception", "task_type": "square_coordinates", "fen": "rn2kbnr/pb1p2q1/1pp1pp1p/6p1/2PPPP2/2N1BN2/PP1QB1PP/2KR3R w kq - 0 11", "prompt": "FEN: rn2kbnr/pb1p2q1/1pp1pp1p/6p1/2PPPP2/2N1BN2/PP1QB1PP/2KR3R w kq - 0 11\nFor square d7, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "d7: file=d; rank=7; fen_row_from_top=2; file_index=4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "d7", "diagnostic": true, "hard_gate": false, "square": "d7"}} {"example_id": "perception_01033", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r1b3k1/pp1p1p2/1b4p1/n1pr2BQ/8/8/PP3PPP/R3R1K1 w - -", "prompt": "FEN: r1b3k1/pp1p1p2/1b4p1/n1pr2BQ/8/8/PP3PPP/R3R1K1 w - -\nCompressed rank 4 row: 8\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 4: a=1; b=1; c=1; d=1; e=1; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "4", "_fen_rank_expansion_row": "8", "diagnostic": true, "hard_gate": false, "rank": "4", "fen_rank_row": "8"}} {"example_id": "perception_01034", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r4Rk1/p3n3/1p2p2p/2b1B1p1/P1PpP1q1/1B6/6PP/5R1K b - - 0 29", "prompt": "Rank 8 row before: r4Rk1\nFile a changes from r to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 8: r4Rk1 -> 5rk1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "a8f8", "_fen_rank_cell_edit_square": "a8", "_fen_rank_cell_edit_rank": "8", "_fen_rank_cell_edit_file": "a", "_fen_rank_cell_edit_before_row": "r4Rk1", "_fen_rank_cell_edit_after_row": "5rk1", "_fen_rank_cell_edit_before_fen": "r", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "a8f8", "square": "a8", "rank": "8", "file": "a", "before_row": "r4Rk1", "after_row": "5rk1", "before_fen": "r", "after_fen": "1"}} {"example_id": "perception_01035", "split": "perception", "task_type": "fen_board_edit", "fen": "3R4/8/4N3/4k3/8/5Q2/8/2b2K2 b - -", "prompt": "Board FEN before: 3R4/8/4N3/4k3/8/5Q2/8/2b2K2\nApply square edits: c1 b->1; f4 1->b\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 3R4/8/4N3/4k3/5b2/5Q2/8/5K2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "c1f4", "_fen_board_edit_board_fen_before": "3R4/8/4N3/4k3/8/5Q2/8/2b2K2", "_fen_board_edit_board_fen_after": "3R4/8/4N3/4k3/5b2/5Q2/8/5K2", "_fen_board_edit_edit_text": "c1 b->1; f4 1->b", "_fen_board_edit_changed_squares": [{"square": "c1", "before": "black bishop", "after": "empty", "before_fen": "b", "after_fen": "1"}, {"square": "f4", "before": "empty", "after": "black bishop", "before_fen": "1", "after_fen": "b"}], "diagnostic": true, "hard_gate": false, "move": "c1f4", "board_fen_before": "3R4/8/4N3/4k3/8/5Q2/8/2b2K2", "board_fen_after": "3R4/8/4N3/4k3/5b2/5Q2/8/5K2", "edit_text": "c1 b->1; f4 1->b", "changed_squares": [{"square": "c1", "before": "black bishop", "after": "empty", "before_fen": "b", "after_fen": "1"}, {"square": "f4", "before": "empty", "after": "black bishop", "before_fen": "1", "after_fen": "b"}]}} {"example_id": "perception_01036", "split": "perception", "task_type": "move_square_edits", "fen": "rn2kb1r/ppq1npp1/2p1p3/P2pPb1p/3P3P/2P2N2/1P2BPP1/RNBQK2R b KQkq -", "prompt": "Starting FEN: rn2kb1r/ppq1npp1/2p1p3/P2pPb1p/3P3P/2P2N2/1P2BPP1/RNBQK2R b KQkq -\nMove: c6c5\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: c6=black pawn; c5=empty.\nSquares: c6 black pawn->empty; c5 empty->black pawn.\nRanks: rank 6 c p->1; rank 5 c 1->p.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "c6c5", "diagnostic": true, "hard_gate": false, "move": "c6c5"}} {"example_id": "perception_01037", "split": "perception", "task_type": "fen_assembly", "fen": "rnbqkb1r/ppp2ppp/4pn2/3pN3/3P1B2/8/PPP1PPPP/RN1QKB1R b KQkq -", "prompt": "Starting FEN: rnbqkb1r/ppp2ppp/4pn2/3pN3/3P1B2/8/PPP1PPPP/RN1QKB1R b KQkq - 0 1\nMove: g7g6\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black pawn g7g6.\nLookup: g7=black pawn; g6=empty.\nSquares: g7 black pawn->empty; g6 empty->black pawn.\nRanks: rank 7 g p->1; rank 6 g 1->p.\nResult FEN: rnbqkb1r/ppp2p1p/4pnp1/3pN3/3P1B2/8/PPP1PPPP/RN1QKB1R w KQkq - 0 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "g7g6", "diagnostic": true, "hard_gate": false, "move": "g7g6"}} {"example_id": "perception_01038", "split": "perception", "task_type": "fen_row_application", "fen": "rnb1k2r/pp1pppb1/1qp3pn/8/3PP3/2P5/PP3PP1/RNBQKBNR w KQkq -", "prompt": "Starting FEN: rnb1k2r/pp1pppb1/1qp3pn/8/3PP3/2P5/PP3PP1/RNBQKBNR w KQkq - 0 1\nMove: d1g4\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 1 RNBQKBNR->RNB1KBNR; rank 4 3PP3->3PP1Q1.\nResult FEN: rnb1k2r/pp1pppb1/1qp3pn/8/3PP1Q1/2P5/PP3PP1/RNB1KBNR b KQkq - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "d1g4", "_fen_row_application_rank_rewrites": [{"rank": "1", "before": "RNBQKBNR", "after": "RNB1KBNR"}, {"rank": "4", "before": "3PP3", "after": "3PP1Q1"}], "diagnostic": true, "hard_gate": false, "move": "d1g4", "rank_rewrites": [{"rank": "1", "before": "RNBQKBNR", "after": "RNB1KBNR"}, {"rank": "4", "before": "3PP3", "after": "3PP1Q1"}]}} {"example_id": "perception_01039", "split": "perception", "task_type": "state_tracking", "fen": "rn1qkbnr/pp3ppb/2p4p/3pPp2/3P2P1/2NB4/PPP4P/R1BQK1NR w KQkq - 0 9", "prompt": "Starting FEN: rn1qkbnr/pp3ppb/2p4p/3pPp2/3P2P1/2NB4/PPP4P/R1BQK1NR w KQkq - 0 9\nAfter the moves e1f2, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 9\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rn1qkbnr/pp3ppb/2p4p/3pPp2/3P2P1/2NB4/PPP2K1P/R1BQ2NR b kq - 1 9", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "e1f2", "_state_tracking_result": "rn1qkbnr/pp3ppb/2p4p/3pPp2/3P2P1/2NB4/PPP2K1P/R1BQ2NR b kq - 1 9"}} {"example_id": "perception_01040", "split": "perception", "task_type": "material_inventory", "fen": "r1b1k2r/1pq1b3/p3p2p/3pP1p1/2pQ4/P1P3BP/1P3PP1/RB3RK1 b kq - 0 22", "prompt": "FEN: r1b1k2r/1pq1b3/p3p2p/3pP1p1/2pQ4/P1P3BP/1P3PP1/RB3RK1 b kq - 0 22\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=d4; rook=a1,f1; bishop=b1,g3; knight=none; pawn=b2,f2,g2,a3,c3,h3,e5.\nBlack inventory: king=e8; queen=c7; rook=a8,h8; bishop=e7,c8; knight=none; pawn=c4,d5,g5,a6,e6,h6,b7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01041", "split": "perception", "task_type": "material_piece_counts", "fen": "6k1/pp3pb1/2p1bn1p/4p3/2P1Pp2/1PNB1N1P/P4PP1/6K1 b - - 0 25", "prompt": "FEN: 6k1/pp3pb1/2p1bn1p/4p3/2P1Pp2/1PNB1N1P/P4PP1/6K1 b - - 0 25\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=0; bishop=1; knight=2; pawn=7.\nBlack counts: king=1; queen=0; rook=0; bishop=2; knight=1; pawn=7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01042", "split": "perception", "task_type": "material_value_totals", "fen": "2rr1k2/pb3ppQ/1p2N3/2q5/7P/2P1nP2/PP4P1/2KR3R b - -", "prompt": "FEN: 2rr1k2/pb3ppQ/1p2N3/2q5/7P/2P1nP2/PP4P1/2KR3R b - -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=0; knight=3; pawn=6; total=28.\nBlack values: king=0; queen=9; rook=10; bishop=3; knight=3; pawn=4; total=29.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01043", "split": "perception", "task_type": "material_balance_trace", "fen": "r3r1k1/pp2nppp/2n1p3/3pP3/3PbPP1/B1P4P/P2N1K2/R5R1 w - - 4 18", "prompt": "FEN: r3r1k1/pp2nppp/2n1p3/3pP3/3PbPP1/B1P4P/P2N1K2/R5R1 w - - 4 18\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=f2; queen=none; rook=a1,g1; bishop=a3; knight=d2; pawn=a2,c3,h3,d4,f4,g4,e5 | black king=g8; queen=none; rook=a8,e8; bishop=e4; knight=c6,e7; pawn=d5,e6,a7,b7,f7,g7,h7\nCounts: white king=1; queen=0; rook=2; bishop=1; knight=1; pawn=7 | black king=1; queen=0; rook=2; bishop=1; knight=2; pawn=7\nValues: white total=23; black total=26\nBalance: Black is up 3 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01044", "split": "perception", "task_type": "multi_state_tracking", "fen": "7R/8/4K3/3r1p2/4b3/4k3/8/8 b - - 17 58", "prompt": "Starting FEN: 7R/8/4K3/3r1p2/4b3/4k3/8/8 b - - 17 58\nAfter the moves e4c2 h8h5, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 17\nFullmove number: 58\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 8/8/4K3/3r1p1R/8/4k3/2b5/8 b - - 19 59", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "e4c2 h8h5", "_multi_state_tracking_result": "8/8/4K3/3r1p1R/8/4k3/2b5/8 b - - 19 59", "diagnostic": true, "hard_gate": false, "moves": "e4c2 h8h5"}} {"example_id": "perception_01045", "split": "perception", "task_type": "board_print", "fen": "8/8/3K4/3B4/3B1k2/8/8/8 w - -", "prompt": "Position (FEN): 8/8/3K4/3B4/3B1k2/8/8/8 w - -\nShow me the board.", "gold_answer": "8 . . . . . . . .\n7 . . . . . . . .\n6 . . . K . . . .\n5 . . . B . . . .\n4 . . . B . k . .\n3 . . . . . . . .\n2 . . . . . . . .\n1 . . . . . . . .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01046", "split": "perception", "task_type": "board_to_fen", "fen": "2k4r/2p1Np1p/p3p1p1/4P3/5P2/2Q3P1/1KP4P/3r3q b - - 4 26", "prompt": "Here is the current board:\n8 . . k . . . . r\n7 . . p . N p . p\n6 p . . . p . p .\n5 . . . . P . . .\n4 . . . . . P . .\n3 . . Q . . . P .\n2 . K P . . . . P\n1 . . . r . . . q\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 4\nFullmove number: 26\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "2k4r/2p1Np1p/p3p1p1/4P3/5P2/2Q3P1/1KP4P/3r3q b - - 4 26", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01047", "split": "perception", "task_type": "piece_id", "fen": "q5k1/5pp1/8/1pb1P3/1Pp4p/2P2r2/5PQ1/1N3RK1 b - b3", "prompt": "FEN: q5k1/5pp1/8/1pb1P3/1Pp4p/2P2r2/5PQ1/1N3RK1 b - b3\nWhat piece is on c3?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "c3"}} {"example_id": "perception_01048", "split": "perception", "task_type": "material_count", "fen": "rn1q1rk1/pbppppbp/1p4p1/3nP3/3P4/5NB1/PPPN1PPP/R2QKB1R w KQ -", "prompt": "FEN: rn1q1rk1/pbppppbp/1p4p1/3nP3/3P4/5NB1/PPPN1PPP/R2QKB1R w KQ -\nWhat is the material count for both sides?", "gold_answer": "White (16 pieces): 2 bishops, 1 king, 2 knights, 8 pawns, 1 queen, 2 rooks. Black (16 pieces): 2 bishops, 1 king, 2 knights, 8 pawns, 1 queen, 2 rooks. Material is equal.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01049", "split": "perception", "task_type": "square_lookup", "fen": "3R4/6r1/5K2/3b4/3k1P2/8/8/8 b - -", "prompt": "FEN: 3R4/6r1/5K2/3b4/3k1P2/8/8/8 b - -\nWhat is on d5?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "d5=black bishop", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "d5", "diagnostic": true, "hard_gate": false, "square": "d5"}} {"example_id": "perception_01050", "split": "perception", "task_type": "rank_lookup", "fen": "rnbqk2r/ppp2ppp/5n2/3Pp3/2p1P3/2P5/P4PPP/R1BQKBNR w KQkq -", "prompt": "FEN: rnbqk2r/ppp2ppp/5n2/3Pp3/2p1P3/2P5/P4PPP/R1BQKBNR w KQkq -\nWhat is the compressed FEN row for rank 5?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 5: 3Pp3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "5", "_rank_lookup_row": "3Pp3", "diagnostic": true, "hard_gate": false, "rank": "5", "fen_rank_row": "3Pp3"}} {"example_id": "perception_01051", "split": "perception", "task_type": "square_coordinates", "fen": "8/5k2/3R4/2K5/8/8/8/8 w - -", "prompt": "FEN: 8/5k2/3R4/2K5/8/8/8/8 w - -\nFor square d4, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "d4: file=d; rank=4; fen_row_from_top=5; file_index=4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "d4", "diagnostic": true, "hard_gate": false, "square": "d4"}} {"example_id": "perception_01052", "split": "perception", "task_type": "fen_rank_expansion", "fen": "8/p1k5/1p2r3/3p4/3p4/2P1N2P/PP2K1P1/8 w - - 0 39", "prompt": "FEN: 8/p1k5/1p2r3/3p4/3p4/2P1N2P/PP2K1P1/8 w - - 0 39\nCompressed rank 5 row: 3p4\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 5: a=1; b=1; c=1; d=p; e=1; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "5", "_fen_rank_expansion_row": "3p4", "diagnostic": true, "hard_gate": false, "rank": "5", "fen_rank_row": "3p4"}} {"example_id": "perception_01053", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "8/1p4pk/7p/8/3r4/P1Rbp2P/6P1/4R2K w - - 0 39", "prompt": "Rank 1 row before: 4R2K\nFile f changes from 1 to R. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 1: 4R2K -> 5R1K", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "e1f1", "_fen_rank_cell_edit_square": "f1", "_fen_rank_cell_edit_rank": "1", "_fen_rank_cell_edit_file": "f", "_fen_rank_cell_edit_before_row": "4R2K", "_fen_rank_cell_edit_after_row": "5R1K", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "R", "diagnostic": true, "hard_gate": false, "move": "e1f1", "square": "f1", "rank": "1", "file": "f", "before_row": "4R2K", "after_row": "5R1K", "before_fen": "1", "after_fen": "R"}} {"example_id": "perception_01054", "split": "perception", "task_type": "fen_board_edit", "fen": "8/1p1k1ppp/1Pp1p3/3p1b2/3P4/r3P3/4BPPP/5RK1 w - -", "prompt": "Board FEN before: 8/1p1k1ppp/1Pp1p3/3p1b2/3P4/r3P3/4BPPP/5RK1\nApply square edits: e2 B->1; d3 1->B\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 8/1p1k1ppp/1Pp1p3/3p1b2/3P4/r2BP3/5PPP/5RK1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "e2d3", "_fen_board_edit_board_fen_before": "8/1p1k1ppp/1Pp1p3/3p1b2/3P4/r3P3/4BPPP/5RK1", "_fen_board_edit_board_fen_after": "8/1p1k1ppp/1Pp1p3/3p1b2/3P4/r2BP3/5PPP/5RK1", "_fen_board_edit_edit_text": "e2 B->1; d3 1->B", "_fen_board_edit_changed_squares": [{"square": "e2", "before": "white bishop", "after": "empty", "before_fen": "B", "after_fen": "1"}, {"square": "d3", "before": "empty", "after": "white bishop", "before_fen": "1", "after_fen": "B"}], "diagnostic": true, "hard_gate": false, "move": "e2d3", "board_fen_before": "8/1p1k1ppp/1Pp1p3/3p1b2/3P4/r3P3/4BPPP/5RK1", "board_fen_after": "8/1p1k1ppp/1Pp1p3/3p1b2/3P4/r2BP3/5PPP/5RK1", "edit_text": "e2 B->1; d3 1->B", "changed_squares": [{"square": "e2", "before": "white bishop", "after": "empty", "before_fen": "B", "after_fen": "1"}, {"square": "d3", "before": "empty", "after": "white bishop", "before_fen": "1", "after_fen": "B"}]}} {"example_id": "perception_01055", "split": "perception", "task_type": "move_square_edits", "fen": "r2qkb1r/pp1bppp1/3p1n2/7p/3nP3/2N1BP2/PPPQ2PP/R3KB1R w KQkq -", "prompt": "Starting FEN: r2qkb1r/pp1bppp1/3p1n2/7p/3nP3/2N1BP2/PPPQ2PP/R3KB1R w KQkq -\nMove: e1f2\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: e1=white king; f2=empty.\nSquares: e1 white king->empty; f2 empty->white king.\nRanks: rank 1 e K->1; rank 2 f 1->K.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "e1f2", "diagnostic": true, "hard_gate": false, "move": "e1f2"}} {"example_id": "perception_01056", "split": "perception", "task_type": "fen_assembly", "fen": "r2q1rk1/pb3pb1/4pn1p/3p2p1/8/2NB2B1/PPP2PPP/R2QR1K1 b - - 3 15", "prompt": "Starting FEN: r2q1rk1/pb3pb1/4pn1p/3p2p1/8/2NB2B1/PPP2PPP/R2QR1K1 b - - 3 15\nMove: d5d4\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 3\nFullmove number: 15\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black pawn d5d4.\nLookup: d5=black pawn; d4=empty.\nSquares: d5 black pawn->empty; d4 empty->black pawn.\nRanks: rank 5 d p->1; rank 4 d 1->p.\nResult FEN: r2q1rk1/pb3pb1/4pn1p/6p1/3p4/2NB2B1/PPP2PPP/R2QR1K1 w - - 0 16", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "d5d4", "diagnostic": true, "hard_gate": false, "move": "d5d4"}} {"example_id": "perception_01057", "split": "perception", "task_type": "fen_row_application", "fen": "r3kbnr/1ppq2pp/p1p1bp2/4p3/4P3/5N1P/PPPP1PP1/RNBQR1K1 w kq - 4 8", "prompt": "Starting FEN: r3kbnr/1ppq2pp/p1p1bp2/4p3/4P3/5N1P/PPPP1PP1/RNBQR1K1 w kq - 4 8\nMove: g2g3\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: kq\nEn passant: none\nHalfmove clock: 4\nFullmove number: 8\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 2 PPPP1PP1->PPPP1P2; rank 3 5N1P->5NPP.\nResult FEN: r3kbnr/1ppq2pp/p1p1bp2/4p3/4P3/5NPP/PPPP1P2/RNBQR1K1 b kq - 0 8", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "g2g3", "_fen_row_application_rank_rewrites": [{"rank": "2", "before": "PPPP1PP1", "after": "PPPP1P2"}, {"rank": "3", "before": "5N1P", "after": "5NPP"}], "diagnostic": true, "hard_gate": false, "move": "g2g3", "rank_rewrites": [{"rank": "2", "before": "PPPP1PP1", "after": "PPPP1P2"}, {"rank": "3", "before": "5N1P", "after": "5NPP"}]}} {"example_id": "perception_01058", "split": "perception", "task_type": "state_tracking", "fen": "rnbqk1nr/pp3pbp/2pp2p1/8/3P4/2N1P3/PP3PPP/R1BQKBNR b KQkq - 1 6", "prompt": "Starting FEN: rnbqk1nr/pp3pbp/2pp2p1/8/3P4/2N1P3/PP3PPP/R1BQKBNR b KQkq - 1 6\nAfter the moves c8e6, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 1\nFullmove number: 6\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rn1qk1nr/pp3pbp/2ppb1p1/8/3P4/2N1P3/PP3PPP/R1BQKBNR w KQkq - 2 7", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "c8e6", "_state_tracking_result": "rn1qk1nr/pp3pbp/2ppb1p1/8/3P4/2N1P3/PP3PPP/R1BQKBNR w KQkq - 2 7"}} {"example_id": "perception_01059", "split": "perception", "task_type": "material_inventory", "fen": "r1bq1rk1/pp1nbp1p/2p1p1p1/3pPn2/3P1P2/2N2N2/PPPBQ1PP/2KR1B1R w - - 7 10", "prompt": "FEN: r1bq1rk1/pp1nbp1p/2p1p1p1/3pPn2/3P1P2/2N2N2/PPPBQ1PP/2KR1B1R w - - 7 10\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=c1; queen=e2; rook=d1,h1; bishop=f1,d2; knight=c3,f3; pawn=a2,b2,c2,g2,h2,d4,f4,e5.\nBlack inventory: king=g8; queen=d8; rook=a8,f8; bishop=e7,c8; knight=f5,d7; pawn=d5,c6,e6,g6,a7,b7,f7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01060", "split": "perception", "task_type": "material_piece_counts", "fen": "3k4/8/8/2n5/R7/7P/6PK/8 w - - 1 48", "prompt": "FEN: 3k4/8/8/2n5/R7/7P/6PK/8 w - - 1 48\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=1; bishop=0; knight=0; pawn=2.\nBlack counts: king=1; queen=0; rook=0; bishop=0; knight=1; pawn=0.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01061", "split": "perception", "task_type": "material_value_totals", "fen": "rnbq1rk1/ppp2ppp/3b1n2/3Pp3/2B5/2N2N2/PPPP1PPP/R1BQK2R w KQ -", "prompt": "FEN: rnbq1rk1/ppp2ppp/3b1n2/3Pp3/2B5/2N2N2/PPPP1PPP/R1BQK2R w KQ -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=8; total=39.\nBlack values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=7; total=38.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01062", "split": "perception", "task_type": "material_balance_trace", "fen": "8/1q4pk/3r2p1/7p/4QP2/1P4P1/4R2P/5K2 b - -", "prompt": "FEN: 8/1q4pk/3r2p1/7p/4QP2/1P4P1/4R2P/5K2 b - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=f1; queen=e4; rook=e2; bishop=none; knight=none; pawn=h2,b3,g3,f4 | black king=h7; queen=b7; rook=d6; bishop=none; knight=none; pawn=h5,g6,g7\nCounts: white king=1; queen=1; rook=1; bishop=0; knight=0; pawn=4 | black king=1; queen=1; rook=1; bishop=0; knight=0; pawn=3\nValues: white total=18; black total=17\nBalance: White is up 1 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01063", "split": "perception", "task_type": "multi_state_tracking", "fen": "8/1b3pkp/1p1q1np1/pB1p4/3N4/P1P4P/1P2QPP1/6K1 w - - 2 29", "prompt": "Starting FEN: 8/1b3pkp/1p1q1np1/pB1p4/3N4/P1P4P/1P2QPP1/6K1 w - - 2 29\nAfter the moves b2b3 d6e5 f2f4, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 2\nFullmove number: 29\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 8/1b3pkp/1p3np1/pB1pq3/3N1P2/PPP4P/4Q1P1/6K1 b - - 0 30", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "b2b3 d6e5 f2f4", "_multi_state_tracking_result": "8/1b3pkp/1p3np1/pB1pq3/3N1P2/PPP4P/4Q1P1/6K1 b - - 0 30", "diagnostic": true, "hard_gate": false, "moves": "b2b3 d6e5 f2f4"}} {"example_id": "perception_01064", "split": "perception", "task_type": "board_print", "fen": "8/8/5k2/4p3/5p2/r4K2/8/1R6 w - -", "prompt": "Position (FEN): 8/8/5k2/4p3/5p2/r4K2/8/1R6 w - -\nShow me the board.", "gold_answer": "8 . . . . . . . .\n7 . . . . . . . .\n6 . . . . . k . .\n5 . . . . p . . .\n4 . . . . . p . .\n3 r . . . . K . .\n2 . . . . . . . .\n1 . R . . . . . .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01065", "split": "perception", "task_type": "board_to_fen", "fen": "3q3r/1p1k1pp1/3N4/2B1P3/P4P1p/2P1Q1nP/6P1/3R2K1 b - - 5 27", "prompt": "Here is the current board:\n8 . . . q . . . r\n7 . p . k . p p .\n6 . . . N . . . .\n5 . . B . P . . .\n4 P . . . . P . p\n3 . . P . Q . n P\n2 . . . . . . P .\n1 . . . R . . K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 5\nFullmove number: 27\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "3q3r/1p1k1pp1/3N4/2B1P3/P4P1p/2P1Q1nP/6P1/3R2K1 b - - 5 27", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01066", "split": "perception", "task_type": "piece_id", "fen": "r2q1rk1/pp2bppp/2npbn2/2p1p3/2B1P3/2NPNP2/PPP3PP/R1BQ1RK1 b - -", "prompt": "FEN: r2q1rk1/pp2bppp/2npbn2/2p1p3/2B1P3/2NPNP2/PPP3PP/R1BQ1RK1 b - -\nWhat piece is on c6?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black knight", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "c6"}} {"example_id": "perception_01067", "split": "perception", "task_type": "material_count", "fen": "k5nr/p2B3p/3Bp1p1/p2pp3/3P1P2/1qP5/P5PP/5RK1 w - - 0 28", "prompt": "FEN: k5nr/p2B3p/3Bp1p1/p2pp3/3P1P2/1qP5/P5PP/5RK1 w - - 0 28\nWhat is the material count for both sides?", "gold_answer": "White (10 pieces): 2 bishops, 1 king, 6 pawns, 1 rook. Black (11 pieces): 1 king, 1 knight, 7 pawns, 1 queen, 1 rook. Black is up 7 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01068", "split": "perception", "task_type": "square_lookup", "fen": "r3kbnr/pp2pppp/1qn5/3pP3/1p1P2b1/P4N2/2P2PPP/RNBQKB1R w KQkq -", "prompt": "FEN: r3kbnr/pp2pppp/1qn5/3pP3/1p1P2b1/P4N2/2P2PPP/RNBQKB1R w KQkq -\nWhat is on c5?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "c5=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "c5", "diagnostic": true, "hard_gate": false, "square": "c5"}} {"example_id": "perception_01069", "split": "perception", "task_type": "rank_lookup", "fen": "2k4r/pb1p1r2/4p3/3pP1Bp/8/2PB4/PP3bPP/2R2R1K w - - 0 20", "prompt": "FEN: 2k4r/pb1p1r2/4p3/3pP1Bp/8/2PB4/PP3bPP/2R2R1K w - - 0 20\nWhat is the compressed FEN row for rank 1?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 1: 2R2R1K", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "1", "_rank_lookup_row": "2R2R1K", "diagnostic": true, "hard_gate": false, "rank": "1", "fen_rank_row": "2R2R1K"}} {"example_id": "perception_01070", "split": "perception", "task_type": "square_coordinates", "fen": "1K6/2P5/1q6/8/8/8/3k4/8 w - -", "prompt": "FEN: 1K6/2P5/1q6/8/8/8/3k4/8 w - -\nFor square e6, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "e6: file=e; rank=6; fen_row_from_top=3; file_index=5", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "e6", "diagnostic": true, "hard_gate": false, "square": "e6"}} {"example_id": "perception_01071", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r2qk2r/1bp1npb1/p3p1pp/1p1pP3/3P1PP1/P1QBBN2/1PP4P/2KR2R1 b kq -", "prompt": "FEN: r2qk2r/1bp1npb1/p3p1pp/1p1pP3/3P1PP1/P1QBBN2/1PP4P/2KR2R1 b kq -\nCompressed rank 7 row: 1bp1npb1\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 7: a=1; b=b; c=p; d=1; e=n; f=p; g=b; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "7", "_fen_rank_expansion_row": "1bp1npb1", "diagnostic": true, "hard_gate": false, "rank": "7", "fen_rank_row": "1bp1npb1"}} {"example_id": "perception_01072", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "1k6/8/1P6/6Q1/p7/5P1P/6PK/3q4 b - - 0 55", "prompt": "Rank 1 row before: 3q4\nFile d changes from q to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 1: 3q4 -> 8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "d1f3", "_fen_rank_cell_edit_square": "d1", "_fen_rank_cell_edit_rank": "1", "_fen_rank_cell_edit_file": "d", "_fen_rank_cell_edit_before_row": "3q4", "_fen_rank_cell_edit_after_row": "8", "_fen_rank_cell_edit_before_fen": "q", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "d1f3", "square": "d1", "rank": "1", "file": "d", "before_row": "3q4", "after_row": "8", "before_fen": "q", "after_fen": "1"}} {"example_id": "perception_01073", "split": "perception", "task_type": "fen_board_edit", "fen": "r4rk1/p1pq1p1p/1pNp1npb/3Pp3/1PP3b1/P3PN2/4QP1B/2R1K1R1 w - - 8 26", "prompt": "Board FEN before: r4rk1/p1pq1p1p/1pNp1npb/3Pp3/1PP3b1/P3PN2/4QP1B/2R1K1R1\nApply square edits: b4 P->1; b5 1->P\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: r4rk1/p1pq1p1p/1pNp1npb/1P1Pp3/2P3b1/P3PN2/4QP1B/2R1K1R1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "b4b5", "_fen_board_edit_board_fen_before": "r4rk1/p1pq1p1p/1pNp1npb/3Pp3/1PP3b1/P3PN2/4QP1B/2R1K1R1", "_fen_board_edit_board_fen_after": "r4rk1/p1pq1p1p/1pNp1npb/1P1Pp3/2P3b1/P3PN2/4QP1B/2R1K1R1", "_fen_board_edit_edit_text": "b4 P->1; b5 1->P", "_fen_board_edit_changed_squares": [{"square": "b4", "before": "white pawn", "after": "empty", "before_fen": "P", "after_fen": "1"}, {"square": "b5", "before": "empty", "after": "white pawn", "before_fen": "1", "after_fen": "P"}], "diagnostic": true, "hard_gate": false, "move": "b4b5", "board_fen_before": "r4rk1/p1pq1p1p/1pNp1npb/3Pp3/1PP3b1/P3PN2/4QP1B/2R1K1R1", "board_fen_after": "r4rk1/p1pq1p1p/1pNp1npb/1P1Pp3/2P3b1/P3PN2/4QP1B/2R1K1R1", "edit_text": "b4 P->1; b5 1->P", "changed_squares": [{"square": "b4", "before": "white pawn", "after": "empty", "before_fen": "P", "after_fen": "1"}, {"square": "b5", "before": "empty", "after": "white pawn", "before_fen": "1", "after_fen": "P"}]}} {"example_id": "perception_01074", "split": "perception", "task_type": "move_square_edits", "fen": "rn3rk1/p2p1pq1/1pb4p/5Q2/4P3/4b1PB/P6P/2R2RK1 w - - 0 22", "prompt": "Starting FEN: rn3rk1/p2p1pq1/1pb4p/5Q2/4P3/4b1PB/P6P/2R2RK1 w - - 0 22\nMove: g1g2\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: g1=white king; g2=empty.\nSquares: g1 white king->empty; g2 empty->white king.\nRanks: rank 1 g K->1; rank 2 g 1->K.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "g1g2", "diagnostic": true, "hard_gate": false, "move": "g1g2"}} {"example_id": "perception_01075", "split": "perception", "task_type": "fen_assembly", "fen": "r1bq1rk1/pp3p1p/2pp4/4Pp2/4P1n1/2N3P1/PPP1Q1BP/R4RK1 w - - 0 16", "prompt": "Starting FEN: r1bq1rk1/pp3p1p/2pp4/4Pp2/4P1n1/2N3P1/PPP1Q1BP/R4RK1 w - - 0 16\nMove: h2h4\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 16\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white pawn h2h4.\nLookup: h2=white pawn; h4=empty.\nSquares: h2 white pawn->empty; h4 empty->white pawn.\nRanks: rank 2 h P->1; rank 4 h 1->P.\nResult FEN: r1bq1rk1/pp3p1p/2pp4/4Pp2/4P1nP/2N3P1/PPP1Q1B1/R4RK1 b - - 0 16", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "h2h4", "diagnostic": true, "hard_gate": false, "move": "h2h4"}} {"example_id": "perception_01076", "split": "perception", "task_type": "fen_row_application", "fen": "r7/5kpp/b1p3q1/p2p1r2/3P4/P1N1QP2/1P3P1P/4R2K w - - 3 27", "prompt": "Starting FEN: r7/5kpp/b1p3q1/p2p1r2/3P4/P1N1QP2/1P3P1P/4R2K w - - 3 27\nMove: h2h4\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 3\nFullmove number: 27\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 2 1P3P1P->1P3P2; rank 4 3P4->3P3P.\nResult FEN: r7/5kpp/b1p3q1/p2p1r2/3P3P/P1N1QP2/1P3P2/4R2K b - - 0 27", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "h2h4", "_fen_row_application_rank_rewrites": [{"rank": "2", "before": "1P3P1P", "after": "1P3P2"}, {"rank": "4", "before": "3P4", "after": "3P3P"}], "diagnostic": true, "hard_gate": false, "move": "h2h4", "rank_rewrites": [{"rank": "2", "before": "1P3P1P", "after": "1P3P2"}, {"rank": "4", "before": "3P4", "after": "3P3P"}]}} {"example_id": "perception_01077", "split": "perception", "task_type": "state_tracking", "fen": "r4rk1/5pp1/2nqpnbp/p2p4/3P3Q/1BP1RP2/P2N2PP/R5K1 w - - 2 23", "prompt": "Starting FEN: r4rk1/5pp1/2nqpnbp/p2p4/3P3Q/1BP1RP2/P2N2PP/R5K1 w - - 2 23\nAfter the moves e3d3, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 2\nFullmove number: 23\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r4rk1/5pp1/2nqpnbp/p2p4/3P3Q/1BPR1P2/P2N2PP/R5K1 b - - 3 23", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "e3d3", "_state_tracking_result": "r4rk1/5pp1/2nqpnbp/p2p4/3P3Q/1BPR1P2/P2N2PP/R5K1 b - - 3 23"}} {"example_id": "perception_01078", "split": "perception", "task_type": "material_inventory", "fen": "r2q1rk1/pp3ppp/5n2/1b1pP3/Q7/2B5/P4PPP/R4RK1 w - - 0 16", "prompt": "FEN: r2q1rk1/pp3ppp/5n2/1b1pP3/Q7/2B5/P4PPP/R4RK1 w - - 0 16\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=a4; rook=a1,f1; bishop=c3; knight=none; pawn=a2,f2,g2,h2,e5.\nBlack inventory: king=g8; queen=d8; rook=a8,f8; bishop=b5; knight=f6; pawn=d5,a7,b7,f7,g7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01079", "split": "perception", "task_type": "material_piece_counts", "fen": "rn1qkb1r/pp2ppp1/2p2n2/3p1b1p/3P1B2/2N1PP2/PPP3PP/R2QKBNR w KQkq -", "prompt": "FEN: rn1qkb1r/pp2ppp1/2p2n2/3p1b1p/3P1B2/2N1PP2/PPP3PP/R2QKBNR w KQkq -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=8.\nBlack counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=8.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01080", "split": "perception", "task_type": "material_value_totals", "fen": "8/1R4p1/2n1ppkp/2P5/3P4/r2n1P2/p2B2PP/R5K1 b - - 6 37", "prompt": "FEN: 8/1R4p1/2n1ppkp/2P5/3P4/r2n1P2/p2B2PP/R5K1 b - - 6 37\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=10; bishop=3; knight=0; pawn=5; total=18.\nBlack values: king=0; queen=0; rook=5; bishop=0; knight=6; pawn=5; total=16.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01081", "split": "perception", "task_type": "material_balance_trace", "fen": "1k6/1p3r2/1R1R1p2/3PpPp1/6P1/5PK1/2rB4/8 b - - 0 39", "prompt": "FEN: 1k6/1p3r2/1R1R1p2/3PpPp1/6P1/5PK1/2rB4/8 b - - 0 39\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g3; queen=none; rook=b6,d6; bishop=d2; knight=none; pawn=f3,g4,d5,f5 | black king=b8; queen=none; rook=c2,f7; bishop=none; knight=none; pawn=e5,g5,f6,b7\nCounts: white king=1; queen=0; rook=2; bishop=1; knight=0; pawn=4 | black king=1; queen=0; rook=2; bishop=0; knight=0; pawn=4\nValues: white total=17; black total=14\nBalance: White is up 3 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01082", "split": "perception", "task_type": "multi_state_tracking", "fen": "r2qkb1r/1b1n1ppp/p2pp3/8/PN1Nn3/4B3/1PP1BPPP/R2Q1RK1 w kq -", "prompt": "Starting FEN: r2qkb1r/1b1n1ppp/p2pp3/8/PN1Nn3/4B3/1PP1BPPP/R2Q1RK1 w kq - 0 1\nAfter the moves e3d2 a8c8 b2b3, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: kq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 2rqkb1r/1b1n1ppp/p2pp3/8/PN1Nn3/1P6/2PBBPPP/R2Q1RK1 b k - 0 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "e3d2 a8c8 b2b3", "_multi_state_tracking_result": "2rqkb1r/1b1n1ppp/p2pp3/8/PN1Nn3/1P6/2PBBPPP/R2Q1RK1 b k - 0 2", "diagnostic": true, "hard_gate": false, "moves": "e3d2 a8c8 b2b3"}} {"example_id": "perception_01083", "split": "perception", "task_type": "board_print", "fen": "rnb1kbnr/pppp1ppp/8/8/3pPP1q/6P1/PPP4P/RNBQKBNR b KQkq -", "prompt": "Position (FEN): rnb1kbnr/pppp1ppp/8/8/3pPP1q/6P1/PPP4P/RNBQKBNR b KQkq -\nShow me the board.", "gold_answer": "8 r n b . k b n r\n7 p p p p . p p p\n6 . . . . . . . .\n5 . . . . . . . .\n4 . . . p P P . q\n3 . . . . . . P .\n2 P P P . . . . P\n1 R N B Q K B N R\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01084", "split": "perception", "task_type": "board_to_fen", "fen": "rnbqkb1r/pp3p1p/4pnp1/3pB3/3PP3/2N5/PP3PPP/R2QKBNR b KQkq -", "prompt": "Here is the current board:\n8 r n b q k b . r\n7 p p . . . p . p\n6 . . . . p n p .\n5 . . . p B . . .\n4 . . . P P . . .\n3 . . N . . . . .\n2 P P . . . P P P\n1 R . . Q K B N R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "rnbqkb1r/pp3p1p/4pnp1/3pB3/3PP3/2N5/PP3PPP/R2QKBNR b KQkq - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01085", "split": "perception", "task_type": "piece_id", "fen": "rn1qk2r/ppp2ppp/3bbn2/3p4/2PP4/3B1N2/PP2QPPP/RNB1K2R b KQkq -", "prompt": "FEN: rn1qk2r/ppp2ppp/3bbn2/3p4/2PP4/3B1N2/PP2QPPP/RNB1K2R b KQkq -\nWhat piece is on f2?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "f2"}} {"example_id": "perception_01086", "split": "perception", "task_type": "material_count", "fen": "5rk1/1pp3pp/3q4/p3pr2/8/3nQB2/bP1NRPPP/R5K1 b - -", "prompt": "FEN: 5rk1/1pp3pp/3q4/p3pr2/8/3nQB2/bP1NRPPP/R5K1 b - -\nWhat is the material count for both sides?", "gold_answer": "White (10 pieces): 1 bishop, 1 king, 1 knight, 4 pawns, 1 queen, 2 rooks. Black (12 pieces): 1 bishop, 1 king, 1 knight, 6 pawns, 1 queen, 2 rooks. Black is up 2 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01087", "split": "perception", "task_type": "square_lookup", "fen": "r1bq1rk1/ppp1bppp/4p3/3pP3/8/P2Q1N2/1PP2PPP/RNB2RK1 w - - 3 11", "prompt": "FEN: r1bq1rk1/ppp1bppp/4p3/3pP3/8/P2Q1N2/1PP2PPP/RNB2RK1 w - - 3 11\nWhat is on e3?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "e3=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "e3", "diagnostic": true, "hard_gate": false, "square": "e3"}} {"example_id": "perception_01088", "split": "perception", "task_type": "rank_lookup", "fen": "2kr1b1r/ppp1pppp/2n2n2/q7/3P1Q2/2N2B2/PPP2PPP/R1B1K2R b KQ -", "prompt": "FEN: 2kr1b1r/ppp1pppp/2n2n2/q7/3P1Q2/2N2B2/PPP2PPP/R1B1K2R b KQ -\nWhat is the compressed FEN row for rank 2?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 2: PPP2PPP", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "2", "_rank_lookup_row": "PPP2PPP", "diagnostic": true, "hard_gate": false, "rank": "2", "fen_rank_row": "PPP2PPP"}} {"example_id": "perception_01089", "split": "perception", "task_type": "square_coordinates", "fen": "rn1qkbnr/pp2pppp/2p5/5b2/2pP4/2N1P3/PP3PPP/R1BQKBNR w KQkq - 0 5", "prompt": "FEN: rn1qkbnr/pp2pppp/2p5/5b2/2pP4/2N1P3/PP3PPP/R1BQKBNR w KQkq - 0 5\nFor square d2, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "d2: file=d; rank=2; fen_row_from_top=7; file_index=4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "d2", "diagnostic": true, "hard_gate": false, "square": "d2"}} {"example_id": "perception_01090", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r2qkb1r/pp1n1ppp/2ppbn2/4p3/2P1P3/2NP1N2/PP2BPPP/R1BQ1RK1 b kq - 0 7", "prompt": "FEN: r2qkb1r/pp1n1ppp/2ppbn2/4p3/2P1P3/2NP1N2/PP2BPPP/R1BQ1RK1 b kq - 0 7\nCompressed rank 5 row: 4p3\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 5: a=1; b=1; c=1; d=1; e=p; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "5", "_fen_rank_expansion_row": "4p3", "diagnostic": true, "hard_gate": false, "rank": "5", "fen_rank_row": "4p3"}} {"example_id": "perception_01091", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "8/7k/3r4/6pp/R7/5PK1/6P1/8 w - -", "prompt": "Rank 3 row before: 5PK1\nFile g changes from K to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 3: 5PK1 -> 5P1K", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "g3h3", "_fen_rank_cell_edit_square": "g3", "_fen_rank_cell_edit_rank": "3", "_fen_rank_cell_edit_file": "g", "_fen_rank_cell_edit_before_row": "5PK1", "_fen_rank_cell_edit_after_row": "5P1K", "_fen_rank_cell_edit_before_fen": "K", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "g3h3", "square": "g3", "rank": "3", "file": "g", "before_row": "5PK1", "after_row": "5P1K", "before_fen": "K", "after_fen": "1"}} {"example_id": "perception_01092", "split": "perception", "task_type": "fen_board_edit", "fen": "r2qk1nr/ppp1bppp/3pb3/4n3/4P3/2N2N2/PPP1BPPP/R1BQ1RK1 b kq - 1 8", "prompt": "Board FEN before: r2qk1nr/ppp1bppp/3pb3/4n3/4P3/2N2N2/PPP1BPPP/R1BQ1RK1\nApply square edits: g7 p->1; g5 1->p\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: r2qk1nr/ppp1bp1p/3pb3/4n1p1/4P3/2N2N2/PPP1BPPP/R1BQ1RK1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "g7g5", "_fen_board_edit_board_fen_before": "r2qk1nr/ppp1bppp/3pb3/4n3/4P3/2N2N2/PPP1BPPP/R1BQ1RK1", "_fen_board_edit_board_fen_after": "r2qk1nr/ppp1bp1p/3pb3/4n1p1/4P3/2N2N2/PPP1BPPP/R1BQ1RK1", "_fen_board_edit_edit_text": "g7 p->1; g5 1->p", "_fen_board_edit_changed_squares": [{"square": "g7", "before": "black pawn", "after": "empty", "before_fen": "p", "after_fen": "1"}, {"square": "g5", "before": "empty", "after": "black pawn", "before_fen": "1", "after_fen": "p"}], "diagnostic": true, "hard_gate": false, "move": "g7g5", "board_fen_before": "r2qk1nr/ppp1bppp/3pb3/4n3/4P3/2N2N2/PPP1BPPP/R1BQ1RK1", "board_fen_after": "r2qk1nr/ppp1bp1p/3pb3/4n1p1/4P3/2N2N2/PPP1BPPP/R1BQ1RK1", "edit_text": "g7 p->1; g5 1->p", "changed_squares": [{"square": "g7", "before": "black pawn", "after": "empty", "before_fen": "p", "after_fen": "1"}, {"square": "g5", "before": "empty", "after": "black pawn", "before_fen": "1", "after_fen": "p"}]}} {"example_id": "perception_01093", "split": "perception", "task_type": "move_square_edits", "fen": "r6r/1p1k1ppp/1Pp1p3/3p1b2/3P4/P3P3/5PPP/R3KB1R b KQ -", "prompt": "Starting FEN: r6r/1p1k1ppp/1Pp1p3/3p1b2/3P4/P3P3/5PPP/R3KB1R b KQ -\nMove: f5g4\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: f5=black bishop; g4=empty.\nSquares: f5 black bishop->empty; g4 empty->black bishop.\nRanks: rank 5 f b->1; rank 4 g 1->b.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "f5g4", "diagnostic": true, "hard_gate": false, "move": "f5g4"}} {"example_id": "perception_01094", "split": "perception", "task_type": "fen_assembly", "fen": "r5k1/2p2p1p/3p2p1/pPpRnn2/P7/r7/4R3/4K3 w - - 1 32", "prompt": "Starting FEN: r5k1/2p2p1p/3p2p1/pPpRnn2/P7/r7/4R3/4K3 w - - 1 32\nMove: d5d3\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 32\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white rook d5d3.\nLookup: d5=white rook; d3=empty.\nSquares: d5 white rook->empty; d3 empty->white rook.\nRanks: rank 5 d R->1; rank 3 d 1->R.\nResult FEN: r5k1/2p2p1p/3p2p1/pPp1nn2/P7/r2R4/4R3/4K3 b - - 2 32", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "d5d3", "diagnostic": true, "hard_gate": false, "move": "d5d3"}} {"example_id": "perception_01095", "split": "perception", "task_type": "fen_row_application", "fen": "5rk1/3bbp2/4p1p1/p7/3P4/2N1PN2/Pr3PP1/2R1KB1R w K - 0 23", "prompt": "Starting FEN: 5rk1/3bbp2/4p1p1/p7/3P4/2N1PN2/Pr3PP1/2R1KB1R w K - 0 23\nMove: f3g1\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: K\nEn passant: none\nHalfmove clock: 0\nFullmove number: 23\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 3 2N1PN2->2N1P3; rank 1 2R1KB1R->2R1KBNR.\nResult FEN: 5rk1/3bbp2/4p1p1/p7/3P4/2N1P3/Pr3PP1/2R1KBNR b K - 1 23", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "f3g1", "_fen_row_application_rank_rewrites": [{"rank": "3", "before": "2N1PN2", "after": "2N1P3"}, {"rank": "1", "before": "2R1KB1R", "after": "2R1KBNR"}], "diagnostic": true, "hard_gate": false, "move": "f3g1", "rank_rewrites": [{"rank": "3", "before": "2N1PN2", "after": "2N1P3"}, {"rank": "1", "before": "2R1KB1R", "after": "2R1KBNR"}]}} {"example_id": "perception_01096", "split": "perception", "task_type": "state_tracking", "fen": "rnbq1rk1/pp3ppp/4pn2/2bp2B1/2P5/2N1PN2/PP3PPP/R2QKB1R b KQ -", "prompt": "Starting FEN: rnbq1rk1/pp3ppp/4pn2/2bp2B1/2P5/2N1PN2/PP3PPP/R2QKB1R b KQ - 0 1\nAfter the moves c5b6, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rnbq1rk1/pp3ppp/1b2pn2/3p2B1/2P5/2N1PN2/PP3PPP/R2QKB1R w KQ - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "c5b6", "_state_tracking_result": "rnbq1rk1/pp3ppp/1b2pn2/3p2B1/2P5/2N1PN2/PP3PPP/R2QKB1R w KQ - 1 2"}} {"example_id": "perception_01097", "split": "perception", "task_type": "material_inventory", "fen": "r1b1kb1r/p2p1pp1/4p2p/1pp1q3/3nP3/P1NP4/BPP2PPP/R2QK1NR b KQkq -", "prompt": "FEN: r1b1kb1r/p2p1pp1/4p2p/1pp1q3/3nP3/P1NP4/BPP2PPP/R2QK1NR b KQkq -\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=e1; queen=d1; rook=a1,h1; bishop=a2; knight=g1,c3; pawn=b2,c2,f2,g2,h2,a3,d3,e4.\nBlack inventory: king=e8; queen=e5; rook=a8,h8; bishop=c8,f8; knight=d4; pawn=b5,c5,e6,h6,a7,d7,f7,g7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01098", "split": "perception", "task_type": "material_piece_counts", "fen": "r3kb1r/1ppbppp1/p1n5/5n1p/5P2/2N2N2/PPP1BBPP/3R1K1R b - -", "prompt": "FEN: r3kb1r/1ppbppp1/p1n5/5n1p/5P2/2N2N2/PPP1BBPP/3R1K1R b - -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=2; bishop=2; knight=2; pawn=6.\nBlack counts: king=1; queen=0; rook=2; bishop=2; knight=2; pawn=7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01099", "split": "perception", "task_type": "material_value_totals", "fen": "8/5p2/5p2/2Nk4/1p6/7P/1P3PP1/5K2 w - - 5 38", "prompt": "FEN: 8/5p2/5p2/2Nk4/1p6/7P/1P3PP1/5K2 w - - 5 38\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=0; bishop=0; knight=3; pawn=4; total=7.\nBlack values: king=0; queen=0; rook=0; bishop=0; knight=0; pawn=3; total=3.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01100", "split": "perception", "task_type": "material_balance_trace", "fen": "4r3/1p3pk1/p4p1p/3N4/8/8/PPPR1PPP/2K5 w - - 6 27", "prompt": "FEN: 4r3/1p3pk1/p4p1p/3N4/8/8/PPPR1PPP/2K5 w - - 6 27\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=c1; queen=none; rook=d2; bishop=none; knight=d5; pawn=a2,b2,c2,f2,g2,h2 | black king=g7; queen=none; rook=e8; bishop=none; knight=none; pawn=a6,f6,h6,b7,f7\nCounts: white king=1; queen=0; rook=1; bishop=0; knight=1; pawn=6 | black king=1; queen=0; rook=1; bishop=0; knight=0; pawn=5\nValues: white total=14; black total=10\nBalance: White is up 4 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01101", "split": "perception", "task_type": "multi_state_tracking", "fen": "8/8/3k1Pp1/8/8/8/2K5/8 w - -", "prompt": "Starting FEN: 8/8/3k1Pp1/8/8/8/2K5/8 w - - 0 1\nAfter the moves c2b3 d6c6 b3a4, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 8/8/2k2Pp1/8/K7/8/8/8 b - - 3 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "c2b3 d6c6 b3a4", "_multi_state_tracking_result": "8/8/2k2Pp1/8/K7/8/8/8 b - - 3 2", "diagnostic": true, "hard_gate": false, "moves": "c2b3 d6c6 b3a4"}} {"example_id": "perception_01102", "split": "perception", "task_type": "board_print", "fen": "8/8/3bb3/6K1/5r2/8/2k5/8 b - -", "prompt": "Position (FEN): 8/8/3bb3/6K1/5r2/8/2k5/8 b - -\nShow me the board.", "gold_answer": "8 . . . . . . . .\n7 . . . . . . . .\n6 . . . b b . . .\n5 . . . . . . K .\n4 . . . . . r . .\n3 . . . . . . . .\n2 . . k . . . . .\n1 . . . . . . . .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01103", "split": "perception", "task_type": "board_to_fen", "fen": "rnbq1rk1/ppppbppp/4p3/8/3P1P2/P1N3P1/1PP1NP1P/R2QKB1R b KQ -", "prompt": "Here is the current board:\n8 r n b q . r k .\n7 p p p p b p p p\n6 . . . . p . . .\n5 . . . . . . . .\n4 . . . P . P . .\n3 P . N . . . P .\n2 . P P . N P . P\n1 R . . Q K B . R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "rnbq1rk1/ppppbppp/4p3/8/3P1P2/P1N3P1/1PP1NP1P/R2QKB1R b KQ - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01104", "split": "perception", "task_type": "piece_id", "fen": "8/7r/8/8/6k1/2n3P1/8/q3K3 w - - 2 57", "prompt": "FEN: 8/7r/8/8/6k1/2n3P1/8/q3K3 w - - 2 57\nWhat piece is on g4?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black king", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "g4"}} {"example_id": "perception_01105", "split": "perception", "task_type": "material_count", "fen": "8/6pk/p1Q1p3/3pp2p/5n2/2P1n1qP/PP4P1/6RK w - - 0 32", "prompt": "FEN: 8/6pk/p1Q1p3/3pp2p/5n2/2P1n1qP/PP4P1/6RK w - - 0 32\nWhat is the material count for both sides?", "gold_answer": "White (8 pieces): 1 king, 5 pawns, 1 queen, 1 rook. Black (10 pieces): 1 king, 2 knights, 6 pawns, 1 queen. Black is up 2 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01106", "split": "perception", "task_type": "square_lookup", "fen": "rn1qkb1r/ppp2ppp/4pn2/3p1b2/1P6/P3P3/1BPP1PPP/RN1QKBNR w KQkq - 2 5", "prompt": "FEN: rn1qkb1r/ppp2ppp/4pn2/3p1b2/1P6/P3P3/1BPP1PPP/RN1QKBNR w KQkq - 2 5\nWhat is on b6?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "b6=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "b6", "diagnostic": true, "hard_gate": false, "square": "b6"}} {"example_id": "perception_01107", "split": "perception", "task_type": "rank_lookup", "fen": "rn1qkb1r/pp3ppp/2pp1n2/4p3/3PP1b1/2PB1N2/PP3PPP/RNBQK2R w KQkq -", "prompt": "FEN: rn1qkb1r/pp3ppp/2pp1n2/4p3/3PP1b1/2PB1N2/PP3PPP/RNBQK2R w KQkq -\nWhat is the compressed FEN row for rank 5?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 5: 4p3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "5", "_rank_lookup_row": "4p3", "diagnostic": true, "hard_gate": false, "rank": "5", "fen_rank_row": "4p3"}} {"example_id": "perception_01108", "split": "perception", "task_type": "square_coordinates", "fen": "r1bqk2r/pppn1p2/3p2p1/3Pp1NB/2P1P2p/2N4P/PP1Q1PP1/R3K2R b KQq -", "prompt": "FEN: r1bqk2r/pppn1p2/3p2p1/3Pp1NB/2P1P2p/2N4P/PP1Q1PP1/R3K2R b KQq -\nFor square d4, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "d4: file=d; rank=4; fen_row_from_top=5; file_index=4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "d4", "diagnostic": true, "hard_gate": false, "square": "d4"}} {"example_id": "perception_01109", "split": "perception", "task_type": "fen_rank_expansion", "fen": "8/5pk1/5Np1/8/5n2/r4P1p/2Q2P1K/8 w - - 3 49", "prompt": "FEN: 8/5pk1/5Np1/8/5n2/r4P1p/2Q2P1K/8 w - - 3 49\nCompressed rank 8 row: 8\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 8: a=1; b=1; c=1; d=1; e=1; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "8", "_fen_rank_expansion_row": "8", "diagnostic": true, "hard_gate": false, "rank": "8", "fen_rank_row": "8"}} {"example_id": "perception_01110", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r3k2r/ppp2ppp/3p4/2bPp3/N1P1P3/3B1n1P/PP2NqQK/R1B5 w kq -", "prompt": "Rank 1 row before: R1B5\nFile h changes from 1 to K. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 1: R1B5 -> R1B4K", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "h2h1", "_fen_rank_cell_edit_square": "h1", "_fen_rank_cell_edit_rank": "1", "_fen_rank_cell_edit_file": "h", "_fen_rank_cell_edit_before_row": "R1B5", "_fen_rank_cell_edit_after_row": "R1B4K", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "K", "diagnostic": true, "hard_gate": false, "move": "h2h1", "square": "h1", "rank": "1", "file": "h", "before_row": "R1B5", "after_row": "R1B4K", "before_fen": "1", "after_fen": "K"}} {"example_id": "perception_01111", "split": "perception", "task_type": "fen_board_edit", "fen": "8/8/8/1P6/2k5/8/8/7K b - -", "prompt": "Board FEN before: 8/8/8/1P6/2k5/8/8/7K\nApply square edits: c4 k->1; c5 1->k\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 8/8/8/1Pk5/8/8/8/7K", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "c4c5", "_fen_board_edit_board_fen_before": "8/8/8/1P6/2k5/8/8/7K", "_fen_board_edit_board_fen_after": "8/8/8/1Pk5/8/8/8/7K", "_fen_board_edit_edit_text": "c4 k->1; c5 1->k", "_fen_board_edit_changed_squares": [{"square": "c4", "before": "black king", "after": "empty", "before_fen": "k", "after_fen": "1"}, {"square": "c5", "before": "empty", "after": "black king", "before_fen": "1", "after_fen": "k"}], "diagnostic": true, "hard_gate": false, "move": "c4c5", "board_fen_before": "8/8/8/1P6/2k5/8/8/7K", "board_fen_after": "8/8/8/1Pk5/8/8/8/7K", "edit_text": "c4 k->1; c5 1->k", "changed_squares": [{"square": "c4", "before": "black king", "after": "empty", "before_fen": "k", "after_fen": "1"}, {"square": "c5", "before": "empty", "after": "black king", "before_fen": "1", "after_fen": "k"}]}} {"example_id": "perception_01112", "split": "perception", "task_type": "move_square_edits", "fen": "r6r/pppkq1p1/3pp2p/7Q/3pP2P/2P3P1/PP1R1P2/2K4R w - - 0 20", "prompt": "Starting FEN: r6r/pppkq1p1/3pp2p/7Q/3pP2P/2P3P1/PP1R1P2/2K4R w - - 0 20\nMove: c3d4\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: c3=white pawn; d4=black pawn.\nSquares: c3 white pawn->empty; d4 black pawn->white pawn.\nRanks: rank 3 c P->1; rank 4 d p->P.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "c3d4", "diagnostic": true, "hard_gate": false, "move": "c3d4"}} {"example_id": "perception_01113", "split": "perception", "task_type": "fen_assembly", "fen": "4r3/5pk1/6p1/4p3/4Q1Pq/rP2R3/P4PK1/R7 b - -", "prompt": "Starting FEN: 4r3/5pk1/6p1/4p3/4Q1Pq/rP2R3/P4PK1/R7 b - - 0 1\nMove: e8c8\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black rook e8c8.\nLookup: e8=black rook; c8=empty.\nSquares: e8 black rook->empty; c8 empty->black rook.\nRanks: rank 8 e r->1; rank 8 c 1->r.\nResult FEN: 2r5/5pk1/6p1/4p3/4Q1Pq/rP2R3/P4PK1/R7 w - - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "e8c8", "diagnostic": true, "hard_gate": false, "move": "e8c8"}} {"example_id": "perception_01114", "split": "perception", "task_type": "fen_row_application", "fen": "6k1/4q1p1/p3p2p/P1rpPp1b/1P1n4/8/3Q1PPP/R4BK1 w - -", "prompt": "Starting FEN: 6k1/4q1p1/p3p2p/P1rpPp1b/1P1n4/8/3Q1PPP/R4BK1 w - - 0 1\nMove: d2b2\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 2 3Q1PPP->1Q3PPP.\nResult FEN: 6k1/4q1p1/p3p2p/P1rpPp1b/1P1n4/8/1Q3PPP/R4BK1 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "d2b2", "_fen_row_application_rank_rewrites": [{"rank": "2", "before": "3Q1PPP", "after": "1Q3PPP"}], "diagnostic": true, "hard_gate": false, "move": "d2b2", "rank_rewrites": [{"rank": "2", "before": "3Q1PPP", "after": "1Q3PPP"}]}} {"example_id": "perception_01115", "split": "perception", "task_type": "state_tracking", "fen": "r4rk1/pppb1pp1/2n1pq1p/8/Q1pP4/2P1PN2/P3BPPP/R4RK1 w - -", "prompt": "Starting FEN: r4rk1/pppb1pp1/2n1pq1p/8/Q1pP4/2P1PN2/P3BPPP/R4RK1 w - - 0 1\nAfter the moves a1d1, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r4rk1/pppb1pp1/2n1pq1p/8/Q1pP4/2P1PN2/P3BPPP/3R1RK1 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "a1d1", "_state_tracking_result": "r4rk1/pppb1pp1/2n1pq1p/8/Q1pP4/2P1PN2/P3BPPP/3R1RK1 b - - 1 1"}} {"example_id": "perception_01116", "split": "perception", "task_type": "material_inventory", "fen": "8/8/5R2/1r4p1/1P2k3/P4P2/2K4P/8 b - - 0 38", "prompt": "FEN: 8/8/5R2/1r4p1/1P2k3/P4P2/2K4P/8 b - - 0 38\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=c2; queen=none; rook=f6; bishop=none; knight=none; pawn=h2,a3,f3,b4.\nBlack inventory: king=e4; queen=none; rook=b5; bishop=none; knight=none; pawn=g5.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01117", "split": "perception", "task_type": "material_piece_counts", "fen": "r1b1k1nr/ppp2p1p/2np1qp1/2b1p1Q1/2B1P3/2N2N2/PPPP1PPP/R1B2RK1 b kq -", "prompt": "FEN: r1b1k1nr/ppp2p1p/2np1qp1/2b1p1Q1/2B1P3/2N2N2/PPPP1PPP/R1B2RK1 b kq -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=8.\nBlack counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=8.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01118", "split": "perception", "task_type": "material_value_totals", "fen": "rnbqr1k1/bp3ppp/p4n2/P2pN3/1P3P2/2PB4/6PP/RNBQK2R w KQ - 1 13", "prompt": "FEN: rnbqr1k1/bp3ppp/p4n2/P2pN3/1P3P2/2PB4/6PP/RNBQK2R w KQ - 1 13\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=6; total=37.\nBlack values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=6; total=37.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01119", "split": "perception", "task_type": "material_balance_trace", "fen": "8/8/2k5/8/8/B7/8/4KN2 w - -", "prompt": "FEN: 8/8/2k5/8/8/B7/8/4KN2 w - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=e1; queen=none; rook=none; bishop=a3; knight=f1; pawn=none | black king=c6; queen=none; rook=none; bishop=none; knight=none; pawn=none\nCounts: white king=1; queen=0; rook=0; bishop=1; knight=1; pawn=0 | black king=1; queen=0; rook=0; bishop=0; knight=0; pawn=0\nValues: white total=6; black total=0\nBalance: White is up 6 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01120", "split": "perception", "task_type": "multi_state_tracking", "fen": "r1b2r1k/1p5p/p1p2qpQ/2P2p2/PPB1p3/1N5P/5PP1/R4RK1 b - - 1 20", "prompt": "Starting FEN: r1b2r1k/1p5p/p1p2qpQ/2P2p2/PPB1p3/1N5P/5PP1/R4RK1 b - - 1 20\nAfter the moves f8d8 f1e1 d8g8, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 20\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r1b3rk/1p5p/p1p2qpQ/2P2p2/PPB1p3/1N5P/5PP1/R3R1K1 w - - 4 22", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "f8d8 f1e1 d8g8", "_multi_state_tracking_result": "r1b3rk/1p5p/p1p2qpQ/2P2p2/PPB1p3/1N5P/5PP1/R3R1K1 w - - 4 22", "diagnostic": true, "hard_gate": false, "moves": "f8d8 f1e1 d8g8"}} {"example_id": "perception_01121", "split": "perception", "task_type": "board_print", "fen": "r4r2/1p1n2k1/pqb1p1pR/3p4/1P1P2P1/2P2P1N/P2QP3/R3KB2 b Q - 1 18", "prompt": "Position (FEN): r4r2/1p1n2k1/pqb1p1pR/3p4/1P1P2P1/2P2P1N/P2QP3/R3KB2 b Q - 1 18\nShow me the board.", "gold_answer": "8 r . . . . r . .\n7 . p . n . . k .\n6 p q b . p . p R\n5 . . . p . . . .\n4 . P . P . . P .\n3 . . P . . P . N\n2 P . . Q P . . .\n1 R . . . K B . .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01122", "split": "perception", "task_type": "board_to_fen", "fen": "r1b1R1nr/ppp2pkp/3p2q1/nB4N1/8/2P3Q1/P4PPP/RN4K1 b - -", "prompt": "Here is the current board:\n8 r . b . R . n r\n7 p p p . . p k p\n6 . . . p . . q .\n5 n B . . . . N .\n4 . . . . . . . .\n3 . . P . . . Q .\n2 P . . . . P P P\n1 R N . . . . K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r1b1R1nr/ppp2pkp/3p2q1/nB4N1/8/2P3Q1/P4PPP/RN4K1 b - - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01123", "split": "perception", "task_type": "piece_id", "fen": "r1bk3r/p1p2ppp/2p2n2/4p3/1b2P3/2N2N2/PPP2PPP/R1B1K2R w KQ - 0 9", "prompt": "FEN: r1bk3r/p1p2ppp/2p2n2/4p3/1b2P3/2N2N2/PPP2PPP/R1B1K2R w KQ - 0 9\nWhat piece is on g2?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "g2"}} {"example_id": "perception_01124", "split": "perception", "task_type": "material_count", "fen": "r5nr/p2k4/2ppbp2/4p1p1/2P5/4P1p1/PP3PPP/3RK1NR w K - 0 16", "prompt": "FEN: r5nr/p2k4/2ppbp2/4p1p1/2P5/4P1p1/PP3PPP/3RK1NR w K - 0 16\nWhat is the material count for both sides?", "gold_answer": "White (11 pieces): 1 king, 1 knight, 7 pawns, 2 rooks. Black (12 pieces): 1 bishop, 1 king, 1 knight, 7 pawns, 2 rooks. Black is up 3 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01125", "split": "perception", "task_type": "square_lookup", "fen": "rnb2rk1/pp1p1ppp/2pq4/2b1p1B1/2B1P3/3P1N2/PPP2PPP/R2Q1RK1 w - - 2 10", "prompt": "FEN: rnb2rk1/pp1p1ppp/2pq4/2b1p1B1/2B1P3/3P1N2/PPP2PPP/R2Q1RK1 w - - 2 10\nWhat is on c7?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "c7=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "c7", "diagnostic": true, "hard_gate": false, "square": "c7"}} {"example_id": "perception_01126", "split": "perception", "task_type": "rank_lookup", "fen": "r5k1/1rq1bppp/3ppn2/2p5/bnP1P3/1B2BNNP/P2Q1PP1/R2R2K1 w - -", "prompt": "FEN: r5k1/1rq1bppp/3ppn2/2p5/bnP1P3/1B2BNNP/P2Q1PP1/R2R2K1 w - -\nWhat is the compressed FEN row for rank 6?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 6: 3ppn2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "6", "_rank_lookup_row": "3ppn2", "diagnostic": true, "hard_gate": false, "rank": "6", "fen_rank_row": "3ppn2"}} {"example_id": "perception_01127", "split": "perception", "task_type": "square_coordinates", "fen": "7k/7p/2p1pP2/2Pp1p2/3P4/8/P6P/7K b - -", "prompt": "FEN: 7k/7p/2p1pP2/2Pp1p2/3P4/8/P6P/7K b - -\nFor square f7, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "f7: file=f; rank=7; fen_row_from_top=2; file_index=6", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "f7", "diagnostic": true, "hard_gate": false, "square": "f7"}} {"example_id": "perception_01128", "split": "perception", "task_type": "fen_rank_expansion", "fen": "2rq1rk1/1b1p1pp1/4pn1p/8/1b6/1N1QPN2/1P2BPPP/R1R3K1 b - - 1 17", "prompt": "FEN: 2rq1rk1/1b1p1pp1/4pn1p/8/1b6/1N1QPN2/1P2BPPP/R1R3K1 b - - 1 17\nCompressed rank 5 row: 8\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 5: a=1; b=1; c=1; d=1; e=1; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "5", "_fen_rank_expansion_row": "8", "diagnostic": true, "hard_gate": false, "rank": "5", "fen_rank_row": "8"}} {"example_id": "perception_01129", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r1b1k1nr/1p1p1ppp/pqn1p3/8/1bP2B2/PP2P3/3N1PPP/R2QKBNR b KQkq - 0 8", "prompt": "Rank 5 row before: 8\nFile h changes from 1 to p. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 5: 8 -> 7p", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "h7h5", "_fen_rank_cell_edit_square": "h5", "_fen_rank_cell_edit_rank": "5", "_fen_rank_cell_edit_file": "h", "_fen_rank_cell_edit_before_row": "8", "_fen_rank_cell_edit_after_row": "7p", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "p", "diagnostic": true, "hard_gate": false, "move": "h7h5", "square": "h5", "rank": "5", "file": "h", "before_row": "8", "after_row": "7p", "before_fen": "1", "after_fen": "p"}} {"example_id": "perception_01130", "split": "perception", "task_type": "fen_board_edit", "fen": "rnbqk2r/pp3ppp/4pn2/3p4/1bPP4/2N5/PPQ2PPP/R1B1KBNR w KQkq -", "prompt": "Board FEN before: rnbqk2r/pp3ppp/4pn2/3p4/1bPP4/2N5/PPQ2PPP/R1B1KBNR\nApply square edits: c1 B->1; d2 1->B\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: rnbqk2r/pp3ppp/4pn2/3p4/1bPP4/2N5/PPQB1PPP/R3KBNR", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "c1d2", "_fen_board_edit_board_fen_before": "rnbqk2r/pp3ppp/4pn2/3p4/1bPP4/2N5/PPQ2PPP/R1B1KBNR", "_fen_board_edit_board_fen_after": "rnbqk2r/pp3ppp/4pn2/3p4/1bPP4/2N5/PPQB1PPP/R3KBNR", "_fen_board_edit_edit_text": "c1 B->1; d2 1->B", "_fen_board_edit_changed_squares": [{"square": "c1", "before": "white bishop", "after": "empty", "before_fen": "B", "after_fen": "1"}, {"square": "d2", "before": "empty", "after": "white bishop", "before_fen": "1", "after_fen": "B"}], "diagnostic": true, "hard_gate": false, "move": "c1d2", "board_fen_before": "rnbqk2r/pp3ppp/4pn2/3p4/1bPP4/2N5/PPQ2PPP/R1B1KBNR", "board_fen_after": "rnbqk2r/pp3ppp/4pn2/3p4/1bPP4/2N5/PPQB1PPP/R3KBNR", "edit_text": "c1 B->1; d2 1->B", "changed_squares": [{"square": "c1", "before": "white bishop", "after": "empty", "before_fen": "B", "after_fen": "1"}, {"square": "d2", "before": "empty", "after": "white bishop", "before_fen": "1", "after_fen": "B"}]}} {"example_id": "perception_01131", "split": "perception", "task_type": "move_square_edits", "fen": "8/5p2/6k1/3rp2p/7P/6P1/4R1K1/8 w - -", "prompt": "Starting FEN: 8/5p2/6k1/3rp2p/7P/6P1/4R1K1/8 w - -\nMove: g2f2\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: g2=white king; f2=empty.\nSquares: g2 white king->empty; f2 empty->white king.\nRanks: rank 2 g K->1; rank 2 f 1->K.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "g2f2", "diagnostic": true, "hard_gate": false, "move": "g2f2"}} {"example_id": "perception_01132", "split": "perception", "task_type": "fen_assembly", "fen": "5N1k/8/6K1/8/6p1/6N1/8/8 b - -", "prompt": "Starting FEN: 5N1k/8/6K1/8/6p1/6N1/8/8 b - - 0 1\nMove: h8g8\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black king h8g8.\nLookup: h8=black king; g8=empty.\nSquares: h8 black king->empty; g8 empty->black king.\nRanks: rank 8 h k->1; rank 8 g 1->k.\nResult FEN: 5Nk1/8/6K1/8/6p1/6N1/8/8 w - - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "h8g8", "diagnostic": true, "hard_gate": false, "move": "h8g8"}} {"example_id": "perception_01133", "split": "perception", "task_type": "fen_row_application", "fen": "r1b1k2r/ppppqppp/8/4n3/1bP2B2/4P3/PP1N1PPP/R2QKB1R w KQkq -", "prompt": "Starting FEN: r1b1k2r/ppppqppp/8/4n3/1bP2B2/4P3/PP1N1PPP/R2QKB1R w KQkq - 0 1\nMove: d1c1\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 1 R2QKB1R->R1Q1KB1R.\nResult FEN: r1b1k2r/ppppqppp/8/4n3/1bP2B2/4P3/PP1N1PPP/R1Q1KB1R b KQkq - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "d1c1", "_fen_row_application_rank_rewrites": [{"rank": "1", "before": "R2QKB1R", "after": "R1Q1KB1R"}], "diagnostic": true, "hard_gate": false, "move": "d1c1", "rank_rewrites": [{"rank": "1", "before": "R2QKB1R", "after": "R1Q1KB1R"}]}} {"example_id": "perception_01134", "split": "perception", "task_type": "state_tracking", "fen": "rnbq1rk1/ppppbppp/4pn2/8/8/1P4P1/PBPPPPBP/RN1QK1NR w KQ - 3 5", "prompt": "Starting FEN: rnbq1rk1/ppppbppp/4pn2/8/8/1P4P1/PBPPPPBP/RN1QK1NR w KQ - 3 5\nAfter the moves b3b4, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 3\nFullmove number: 5\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rnbq1rk1/ppppbppp/4pn2/8/1P6/6P1/PBPPPPBP/RN1QK1NR b KQ - 0 5", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "b3b4", "_state_tracking_result": "rnbq1rk1/ppppbppp/4pn2/8/1P6/6P1/PBPPPPBP/RN1QK1NR b KQ - 0 5"}} {"example_id": "perception_01135", "split": "perception", "task_type": "material_inventory", "fen": "2rq1rk1/pb1n1ppp/1p1b1n2/2pp4/3P4/1P3NP1/PBQNPPBP/2R2RK1 w - -", "prompt": "FEN: 2rq1rk1/pb1n1ppp/1p1b1n2/2pp4/3P4/1P3NP1/PBQNPPBP/2R2RK1 w - -\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=c2; rook=c1,f1; bishop=b2,g2; knight=d2,f3; pawn=a2,e2,f2,h2,b3,g3,d4.\nBlack inventory: king=g8; queen=d8; rook=c8,f8; bishop=d6,b7; knight=f6,d7; pawn=c5,d5,b6,a7,f7,g7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01136", "split": "perception", "task_type": "material_piece_counts", "fen": "rnb1k1nr/1p3ppp/p1p1p3/q2P4/PbB1P3/2N5/1P3PPP/R1BQK1NR w KQkq - 1 8", "prompt": "FEN: rnb1k1nr/1p3ppp/p1p1p3/q2P4/PbB1P3/2N5/1P3PPP/R1BQK1NR w KQkq - 1 8\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7.\nBlack counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01137", "split": "perception", "task_type": "material_value_totals", "fen": "r2qkbnr/pp3ppp/2n1p3/2pp1b2/2PP4/2N1PN2/PP2BPPP/R1BQK2R b KQkq -", "prompt": "FEN: r2qkbnr/pp3ppp/2n1p3/2pp1b2/2PP4/2N1PN2/PP2BPPP/R1BQK2R b KQkq -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=8; total=39.\nBlack values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=8; total=39.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01138", "split": "perception", "task_type": "material_balance_trace", "fen": "r5k1/pp2pr1p/2pbN1p1/2n2pP1/7P/2N5/PP4B1/2KR3R w - - 6 20", "prompt": "FEN: r5k1/pp2pr1p/2pbN1p1/2n2pP1/7P/2N5/PP4B1/2KR3R w - - 6 20\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=c1; queen=none; rook=d1,h1; bishop=g2; knight=c3,e6; pawn=a2,b2,h4,g5 | black king=g8; queen=none; rook=f7,a8; bishop=d6; knight=c5; pawn=f5,c6,g6,a7,b7,e7,h7\nCounts: white king=1; queen=0; rook=2; bishop=1; knight=2; pawn=4 | black king=1; queen=0; rook=2; bishop=1; knight=1; pawn=7\nValues: white total=23; black total=23\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01139", "split": "perception", "task_type": "multi_state_tracking", "fen": "rn2k2r/ppqb1ppp/2p1pn2/3p4/P2P4/1PBBPP2/2P1N1PP/R2Q1RK1 w kq - 1 12", "prompt": "Starting FEN: rn2k2r/ppqb1ppp/2p1pn2/3p4/P2P4/1PBBPP2/2P1N1PP/R2Q1RK1 w kq - 1 12\nAfter the moves d3b5 e8g8, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: kq\nEn passant: none\nHalfmove clock: 1\nFullmove number: 12\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rn3rk1/ppqb1ppp/2p1pn2/1B1p4/P2P4/1PB1PP2/2P1N1PP/R2Q1RK1 w - - 3 13", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "d3b5 e8g8", "_multi_state_tracking_result": "rn3rk1/ppqb1ppp/2p1pn2/1B1p4/P2P4/1PB1PP2/2P1N1PP/R2Q1RK1 w - - 3 13", "diagnostic": true, "hard_gate": false, "moves": "d3b5 e8g8"}} {"example_id": "perception_01140", "split": "perception", "task_type": "board_print", "fen": "4k2r/1pp3p1/4bp2/4p3/pb6/5R1P/P2r2P1/2K5 b k - 3 32", "prompt": "Position (FEN): 4k2r/1pp3p1/4bp2/4p3/pb6/5R1P/P2r2P1/2K5 b k - 3 32\nShow me the board.", "gold_answer": "8 . . . . k . . r\n7 . p p . . . p .\n6 . . . . b p . .\n5 . . . . p . . .\n4 p b . . . . . .\n3 . . . . . R . P\n2 P . . r . . P .\n1 . . K . . . . .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01141", "split": "perception", "task_type": "board_to_fen", "fen": "rnbqkb1r/pp3ppp/3ppn2/8/2BNP3/8/PPP2PPP/RNBQK2R w KQkq - 1 6", "prompt": "Here is the current board:\n8 r n b q k b . r\n7 p p . . . p p p\n6 . . . p p n . .\n5 . . . . . . . .\n4 . . B N P . . .\n3 . . . . . . . .\n2 P P P . . P P P\n1 R N B Q K . . R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 1\nFullmove number: 6\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "rnbqkb1r/pp3ppp/3ppn2/8/2BNP3/8/PPP2PPP/RNBQK2R w KQkq - 1 6", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01142", "split": "perception", "task_type": "piece_id", "fen": "r4rk1/p4pp1/3p2q1/2p5/5P2/6Q1/PP4RP/R6K w - - 4 27", "prompt": "FEN: r4rk1/p4pp1/3p2q1/2p5/5P2/6Q1/PP4RP/R6K w - - 4 27\nWhat piece is on a8?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black rook", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "a8"}} {"example_id": "perception_01143", "split": "perception", "task_type": "material_count", "fen": "r1b2rk1/ppq1ppbp/3p1np1/4n3/P1B1P3/1NN1BP2/1PP3PP/R2Q1RK1 w - -", "prompt": "FEN: r1b2rk1/ppq1ppbp/3p1np1/4n3/P1B1P3/1NN1BP2/1PP3PP/R2Q1RK1 w - -\nWhat is the material count for both sides?", "gold_answer": "White (15 pieces): 2 bishops, 1 king, 2 knights, 7 pawns, 1 queen, 2 rooks. Black (15 pieces): 2 bishops, 1 king, 2 knights, 7 pawns, 1 queen, 2 rooks. Material is equal.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01144", "split": "perception", "task_type": "square_lookup", "fen": "r4rk1/pp1n1pp1/2pb1q1p/3p4/3P4/2N2bPP/PPP2PB1/R2QR1K1 w - - 0 13", "prompt": "FEN: r4rk1/pp1n1pp1/2pb1q1p/3p4/3P4/2N2bPP/PPP2PB1/R2QR1K1 w - - 0 13\nWhat is on b5?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "b5=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "b5", "diagnostic": true, "hard_gate": false, "square": "b5"}} {"example_id": "perception_01145", "split": "perception", "task_type": "rank_lookup", "fen": "r3k2r/ppqbbpp1/2n1pn2/3pN2p/PPpP1P2/2P1P3/2BN2PP/R1BQ1RK1 w kq - 1 13", "prompt": "FEN: r3k2r/ppqbbpp1/2n1pn2/3pN2p/PPpP1P2/2P1P3/2BN2PP/R1BQ1RK1 w kq - 1 13\nWhat is the compressed FEN row for rank 7?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 7: ppqbbpp1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "7", "_rank_lookup_row": "ppqbbpp1", "diagnostic": true, "hard_gate": false, "rank": "7", "fen_rank_row": "ppqbbpp1"}} {"example_id": "perception_01146", "split": "perception", "task_type": "square_coordinates", "fen": "3Rkb1r/pp2pppp/1n6/4P3/8/5N2/PP4PP/R1B3K1 b k - 0 16", "prompt": "FEN: 3Rkb1r/pp2pppp/1n6/4P3/8/5N2/PP4PP/R1B3K1 b k - 0 16\nFor square c1, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "c1: file=c; rank=1; fen_row_from_top=8; file_index=3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "c1", "diagnostic": true, "hard_gate": false, "square": "c1"}} {"example_id": "perception_01147", "split": "perception", "task_type": "fen_rank_expansion", "fen": "8/4k3/B7/5K2/3Q4/8/8/8 w - -", "prompt": "FEN: 8/4k3/B7/5K2/3Q4/8/8/8 w - -\nCompressed rank 1 row: 8\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 1: a=1; b=1; c=1; d=1; e=1; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "1", "_fen_rank_expansion_row": "8", "diagnostic": true, "hard_gate": false, "rank": "1", "fen_rank_row": "8"}} {"example_id": "perception_01148", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "7r/1kp3p1/8/1p2Pp2/2n2P2/2PrBKPp/P3R2P/2R5 w - - 4 30", "prompt": "Rank 1 row before: 2R5\nFile g changes from 1 to R. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 1: 2R5 -> 6R1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "c1g1", "_fen_rank_cell_edit_square": "g1", "_fen_rank_cell_edit_rank": "1", "_fen_rank_cell_edit_file": "g", "_fen_rank_cell_edit_before_row": "2R5", "_fen_rank_cell_edit_after_row": "6R1", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "R", "diagnostic": true, "hard_gate": false, "move": "c1g1", "square": "g1", "rank": "1", "file": "g", "before_row": "2R5", "after_row": "6R1", "before_fen": "1", "after_fen": "R"}} {"example_id": "perception_01149", "split": "perception", "task_type": "fen_board_edit", "fen": "r1b2rk1/2q1bppp/p1p5/2Ppn3/Q7/1NP1B2P/PP2B1P1/R4R1K b - -", "prompt": "Board FEN before: r1b2rk1/2q1bppp/p1p5/2Ppn3/Q7/1NP1B2P/PP2B1P1/R4R1K\nApply square edits: c8 b->1; g4 1->b\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: r4rk1/2q1bppp/p1p5/2Ppn3/Q5b1/1NP1B2P/PP2B1P1/R4R1K", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "c8g4", "_fen_board_edit_board_fen_before": "r1b2rk1/2q1bppp/p1p5/2Ppn3/Q7/1NP1B2P/PP2B1P1/R4R1K", "_fen_board_edit_board_fen_after": "r4rk1/2q1bppp/p1p5/2Ppn3/Q5b1/1NP1B2P/PP2B1P1/R4R1K", "_fen_board_edit_edit_text": "c8 b->1; g4 1->b", "_fen_board_edit_changed_squares": [{"square": "c8", "before": "black bishop", "after": "empty", "before_fen": "b", "after_fen": "1"}, {"square": "g4", "before": "empty", "after": "black bishop", "before_fen": "1", "after_fen": "b"}], "diagnostic": true, "hard_gate": false, "move": "c8g4", "board_fen_before": "r1b2rk1/2q1bppp/p1p5/2Ppn3/Q7/1NP1B2P/PP2B1P1/R4R1K", "board_fen_after": "r4rk1/2q1bppp/p1p5/2Ppn3/Q5b1/1NP1B2P/PP2B1P1/R4R1K", "edit_text": "c8 b->1; g4 1->b", "changed_squares": [{"square": "c8", "before": "black bishop", "after": "empty", "before_fen": "b", "after_fen": "1"}, {"square": "g4", "before": "empty", "after": "black bishop", "before_fen": "1", "after_fen": "b"}]}} {"example_id": "perception_01150", "split": "perception", "task_type": "move_square_edits", "fen": "r1b4r/1p2knpp/p2npp2/2B5/8/2N5/PP3PPP/R3KB1R w KQ -", "prompt": "Starting FEN: r1b4r/1p2knpp/p2npp2/2B5/8/2N5/PP3PPP/R3KB1R w KQ -\nMove: c5a3\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: c5=white bishop; a3=empty.\nSquares: c5 white bishop->empty; a3 empty->white bishop.\nRanks: rank 5 c B->1; rank 3 a 1->B.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "c5a3", "diagnostic": true, "hard_gate": false, "move": "c5a3"}} {"example_id": "perception_01151", "split": "perception", "task_type": "fen_assembly", "fen": "2krr3/pbppn1b1/1p6/6pp/3NP3/2QBBnP1/PPP4P/2KR3R w - - 4 18", "prompt": "Starting FEN: 2krr3/pbppn1b1/1p6/6pp/3NP3/2QBBnP1/PPP4P/2KR3R w - - 4 18\nMove: d3e2\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 4\nFullmove number: 18\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white bishop d3e2.\nLookup: d3=white bishop; e2=empty.\nSquares: d3 white bishop->empty; e2 empty->white bishop.\nRanks: rank 3 d B->1; rank 2 e 1->B.\nResult FEN: 2krr3/pbppn1b1/1p6/6pp/3NP3/2Q1BnP1/PPP1B2P/2KR3R b - - 5 18", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "d3e2", "diagnostic": true, "hard_gate": false, "move": "d3e2"}} {"example_id": "perception_01152", "split": "perception", "task_type": "fen_row_application", "fen": "2r3k1/pq2nR1B/4p2b/1pPbN1p1/3P2P1/8/P7/4R1K1 b - -", "prompt": "Starting FEN: 2r3k1/pq2nR1B/4p2b/1pPbN1p1/3P2P1/8/P7/4R1K1 b - - 0 1\nMove: g8h8\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 8 2r3k1->2r4k.\nResult FEN: 2r4k/pq2nR1B/4p2b/1pPbN1p1/3P2P1/8/P7/4R1K1 w - - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "g8h8", "_fen_row_application_rank_rewrites": [{"rank": "8", "before": "2r3k1", "after": "2r4k"}], "diagnostic": true, "hard_gate": false, "move": "g8h8", "rank_rewrites": [{"rank": "8", "before": "2r3k1", "after": "2r4k"}]}} {"example_id": "perception_01153", "split": "perception", "task_type": "state_tracking", "fen": "r2r2k1/6pp/1n2qp2/p1R3Q1/1p1Pp3/1P2B2P/P4PP1/1R4K1 w - - 0 26", "prompt": "Starting FEN: r2r2k1/6pp/1n2qp2/p1R3Q1/1p1Pp3/1P2B2P/P4PP1/1R4K1 w - - 0 26\nAfter the moves g1f1, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 26\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r2r2k1/6pp/1n2qp2/p1R3Q1/1p1Pp3/1P2B2P/P4PP1/1R3K2 b - - 1 26", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "g1f1", "_state_tracking_result": "r2r2k1/6pp/1n2qp2/p1R3Q1/1p1Pp3/1P2B2P/P4PP1/1R3K2 b - - 1 26"}} {"example_id": "perception_01154", "split": "perception", "task_type": "material_inventory", "fen": "rnb2r2/1ppp2kp/2n3p1/p2p1p2/P1P5/2N1PN2/2K1BPPP/7R w - - 0 19", "prompt": "FEN: rnb2r2/1ppp2kp/2n3p1/p2p1p2/P1P5/2N1PN2/2K1BPPP/7R w - - 0 19\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=c2; queen=none; rook=h1; bishop=e2; knight=c3,f3; pawn=f2,g2,h2,e3,a4,c4.\nBlack inventory: king=g7; queen=none; rook=a8,f8; bishop=c8; knight=c6,b8; pawn=a5,d5,f5,g6,b7,c7,d7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01155", "split": "perception", "task_type": "material_piece_counts", "fen": "8/5ppk/q6p/1p1Np3/2p1P3/1nP4P/1Q3PP1/5K2 w - - 9 42", "prompt": "FEN: 8/5ppk/q6p/1p1Np3/2p1P3/1nP4P/1Q3PP1/5K2 w - - 9 42\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=0; bishop=0; knight=1; pawn=5.\nBlack counts: king=1; queen=1; rook=0; bishop=0; knight=1; pawn=6.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01156", "split": "perception", "task_type": "material_value_totals", "fen": "r1bqkbnr/pp2pppp/2n5/2p5/4Q3/P1P4P/1P1P1PP1/RNB1KBNR b KQkq - 0 6", "prompt": "FEN: r1bqkbnr/pp2pppp/2n5/2p5/4Q3/P1P4P/1P1P1PP1/RNB1KBNR b KQkq - 0 6\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=7; total=38.\nBlack values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=7; total=38.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01157", "split": "perception", "task_type": "material_balance_trace", "fen": "rnbqkbnr/pp3ppp/4p3/1B1p4/8/5N2/PPPP1PPP/RNBQK2R b KQkq - 1 5", "prompt": "FEN: rnbqkbnr/pp3ppp/4p3/1B1p4/8/5N2/PPPP1PPP/RNBQK2R b KQkq - 1 5\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=e1; queen=d1; rook=a1,h1; bishop=c1,b5; knight=b1,f3; pawn=a2,b2,c2,d2,f2,g2,h2 | black king=e8; queen=d8; rook=a8,h8; bishop=c8,f8; knight=b8,g8; pawn=d5,e6,a7,b7,f7,g7,h7\nCounts: white king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7 | black king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7\nValues: white total=38; black total=38\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01158", "split": "perception", "task_type": "multi_state_tracking", "fen": "r3kb1r/pppqnppp/2b1p3/3pP1N1/3P4/8/PPP2PPP/RNBQ1RK1 b kq - 3 8", "prompt": "Starting FEN: r3kb1r/pppqnppp/2b1p3/3pP1N1/3P4/8/PPP2PPP/RNBQ1RK1 b kq - 3 8\nAfter the moves f7f5 a2a3 f5f4, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: kq\nEn passant: none\nHalfmove clock: 3\nFullmove number: 8\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r3kb1r/pppqn1pp/2b1p3/3pP1N1/3P1p2/P7/1PP2PPP/RNBQ1RK1 w kq - 0 10", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "f7f5 a2a3 f5f4", "_multi_state_tracking_result": "r3kb1r/pppqn1pp/2b1p3/3pP1N1/3P1p2/P7/1PP2PPP/RNBQ1RK1 w kq - 0 10", "diagnostic": true, "hard_gate": false, "moves": "f7f5 a2a3 f5f4"}} {"example_id": "perception_01159", "split": "perception", "task_type": "board_print", "fen": "5qr1/p1p3bk/1p2pr1p/3p1pQR/1P1P1P2/P3P2R/2P1N1PP/6K1 w - - 8 31", "prompt": "Position (FEN): 5qr1/p1p3bk/1p2pr1p/3p1pQR/1P1P1P2/P3P2R/2P1N1PP/6K1 w - - 8 31\nShow me the board.", "gold_answer": "8 . . . . . q r .\n7 p . p . . . b k\n6 . p . . p r . p\n5 . . . p . p Q R\n4 . P . P . P . .\n3 P . . . P . . R\n2 . . P . N . P P\n1 . . . . . . K .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01160", "split": "perception", "task_type": "board_to_fen", "fen": "6k1/6p1/2p2p2/3bp1p1/8/1R1N2PK/1P3P1P/r7 b - - 3 34", "prompt": "Here is the current board:\n8 . . . . . . k .\n7 . . . . . . p .\n6 . . p . . p . .\n5 . . . b p . p .\n4 . . . . . . . .\n3 . R . N . . P K\n2 . P . . . P . P\n1 r . . . . . . .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 3\nFullmove number: 34\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "6k1/6p1/2p2p2/3bp1p1/8/1R1N2PK/1P3P1P/r7 b - - 3 34", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01161", "split": "perception", "task_type": "piece_id", "fen": "8/4b1n1/3p1pkp/2rPp1p1/4P3/5PPP/R1PN1K2/4R3 b - - 0 39", "prompt": "FEN: 8/4b1n1/3p1pkp/2rPp1p1/4P3/5PPP/R1PN1K2/4R3 b - - 0 39\nWhat piece is on f2?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white king", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "f2"}} {"example_id": "perception_01162", "split": "perception", "task_type": "material_count", "fen": "r3k1r1/ppp1bppp/5qb1/3P4/2n3P1/2N5/PPP1Q2P/2KR3R b q - 3 15", "prompt": "FEN: r3k1r1/ppp1bppp/5qb1/3P4/2n3P1/2N5/PPP1Q2P/2KR3R b q - 3 15\nWhat is the material count for both sides?", "gold_answer": "White (11 pieces): 1 king, 1 knight, 6 pawns, 1 queen, 2 rooks. Black (13 pieces): 2 bishops, 1 king, 1 knight, 6 pawns, 1 queen, 2 rooks. Black is up 6 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01163", "split": "perception", "task_type": "square_lookup", "fen": "2r4r/1b3kpp/8/pP6/Pb6/2N1pP1P/6P1/2R1K1NR w K - 0 22", "prompt": "FEN: 2r4r/1b3kpp/8/pP6/Pb6/2N1pP1P/6P1/2R1K1NR w K - 0 22\nWhat is on d8?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "d8=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "d8", "diagnostic": true, "hard_gate": false, "square": "d8"}} {"example_id": "perception_01164", "split": "perception", "task_type": "rank_lookup", "fen": "rnb1kbnr/pp3ppp/3q4/2p5/2Pp4/5N2/PPQNPPPP/R1B1KB1R w KQkq - 0 9", "prompt": "FEN: rnb1kbnr/pp3ppp/3q4/2p5/2Pp4/5N2/PPQNPPPP/R1B1KB1R w KQkq - 0 9\nWhat is the compressed FEN row for rank 2?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 2: PPQNPPPP", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "2", "_rank_lookup_row": "PPQNPPPP", "diagnostic": true, "hard_gate": false, "rank": "2", "fen_rank_row": "PPQNPPPP"}} {"example_id": "perception_01165", "split": "perception", "task_type": "square_coordinates", "fen": "8/2K1k3/2P5/8/8/8/2r5/4R3 b - -", "prompt": "FEN: 8/2K1k3/2P5/8/8/8/2r5/4R3 b - -\nFor square b6, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "b6: file=b; rank=6; fen_row_from_top=3; file_index=2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "b6", "diagnostic": true, "hard_gate": false, "square": "b6"}} {"example_id": "perception_01166", "split": "perception", "task_type": "fen_rank_expansion", "fen": "rn1qkb1r/p1pp1ppp/1p2p3/8/2BP2n1/4Q2N/PPP2PbP/RNB1K1R1 w Qkq - 2 8", "prompt": "FEN: rn1qkb1r/p1pp1ppp/1p2p3/8/2BP2n1/4Q2N/PPP2PbP/RNB1K1R1 w Qkq - 2 8\nCompressed rank 7 row: p1pp1ppp\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 7: a=p; b=1; c=p; d=p; e=1; f=p; g=p; h=p", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "7", "_fen_rank_expansion_row": "p1pp1ppp", "diagnostic": true, "hard_gate": false, "rank": "7", "fen_rank_row": "p1pp1ppp"}} {"example_id": "perception_01167", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r5k1/1R3p2/1p2p2p/2b1B1p1/P7/1P2n1P1/7P/2R4K b - -", "prompt": "Rank 8 row before: r5k1\nFile a changes from r to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 8: r5k1 -> 6k1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "a8a6", "_fen_rank_cell_edit_square": "a8", "_fen_rank_cell_edit_rank": "8", "_fen_rank_cell_edit_file": "a", "_fen_rank_cell_edit_before_row": "r5k1", "_fen_rank_cell_edit_after_row": "6k1", "_fen_rank_cell_edit_before_fen": "r", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "a8a6", "square": "a8", "rank": "8", "file": "a", "before_row": "r5k1", "after_row": "6k1", "before_fen": "r", "after_fen": "1"}} {"example_id": "perception_01168", "split": "perception", "task_type": "fen_board_edit", "fen": "7k/8/3p2p1/1p1Q1q2/5PpP/2P3K1/1P1R4/r7 b - -", "prompt": "Board FEN before: 7k/8/3p2p1/1p1Q1q2/5PpP/2P3K1/1P1R4/r7\nApply square edits: a1 r->1; a2 1->r\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 7k/8/3p2p1/1p1Q1q2/5PpP/2P3K1/rP1R4/8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "a1a2", "_fen_board_edit_board_fen_before": "7k/8/3p2p1/1p1Q1q2/5PpP/2P3K1/1P1R4/r7", "_fen_board_edit_board_fen_after": "7k/8/3p2p1/1p1Q1q2/5PpP/2P3K1/rP1R4/8", "_fen_board_edit_edit_text": "a1 r->1; a2 1->r", "_fen_board_edit_changed_squares": [{"square": "a1", "before": "black rook", "after": "empty", "before_fen": "r", "after_fen": "1"}, {"square": "a2", "before": "empty", "after": "black rook", "before_fen": "1", "after_fen": "r"}], "diagnostic": true, "hard_gate": false, "move": "a1a2", "board_fen_before": "7k/8/3p2p1/1p1Q1q2/5PpP/2P3K1/1P1R4/r7", "board_fen_after": "7k/8/3p2p1/1p1Q1q2/5PpP/2P3K1/rP1R4/8", "edit_text": "a1 r->1; a2 1->r", "changed_squares": [{"square": "a1", "before": "black rook", "after": "empty", "before_fen": "r", "after_fen": "1"}, {"square": "a2", "before": "empty", "after": "black rook", "before_fen": "1", "after_fen": "r"}]}} {"example_id": "perception_01169", "split": "perception", "task_type": "move_square_edits", "fen": "5rk1/ppQ4p/4pqp1/8/3P4/P1P5/1P3PPP/4R1K1 w - -", "prompt": "Starting FEN: 5rk1/ppQ4p/4pqp1/8/3P4/P1P5/1P3PPP/4R1K1 w - -\nMove: c7c5\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: c7=white queen; c5=empty.\nSquares: c7 white queen->empty; c5 empty->white queen.\nRanks: rank 7 c Q->1; rank 5 c 1->Q.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "c7c5", "diagnostic": true, "hard_gate": false, "move": "c7c5"}} {"example_id": "perception_01170", "split": "perception", "task_type": "fen_assembly", "fen": "r2q1rk1/1p3pp1/p2bpnnp/3p2B1/3N1P2/8/PPP1Q1PP/RN3RK1 w - - 0 15", "prompt": "Starting FEN: r2q1rk1/1p3pp1/p2bpnnp/3p2B1/3N1P2/8/PPP1Q1PP/RN3RK1 w - - 0 15\nMove: f1e1\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 15\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white rook f1e1.\nLookup: f1=white rook; e1=empty.\nSquares: f1 white rook->empty; e1 empty->white rook.\nRanks: rank 1 f R->1; rank 1 e 1->R.\nResult FEN: r2q1rk1/1p3pp1/p2bpnnp/3p2B1/3N1P2/8/PPP1Q1PP/RN2R1K1 b - - 1 15", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "f1e1", "diagnostic": true, "hard_gate": false, "move": "f1e1"}} {"example_id": "perception_01171", "split": "perception", "task_type": "fen_row_application", "fen": "rn1qkbnr/2pppppp/b7/8/8/5N2/PP1PPPPP/RNBQKB1R b KQkq -", "prompt": "Starting FEN: rn1qkbnr/2pppppp/b7/8/8/5N2/PP1PPPPP/RNBQKB1R b KQkq - 0 1\nMove: e7e6\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 7 2pppppp->2pp1ppp; rank 6 b7->b3p3.\nResult FEN: rn1qkbnr/2pp1ppp/b3p3/8/8/5N2/PP1PPPPP/RNBQKB1R w KQkq - 0 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "e7e6", "_fen_row_application_rank_rewrites": [{"rank": "7", "before": "2pppppp", "after": "2pp1ppp"}, {"rank": "6", "before": "b7", "after": "b3p3"}], "diagnostic": true, "hard_gate": false, "move": "e7e6", "rank_rewrites": [{"rank": "7", "before": "2pppppp", "after": "2pp1ppp"}, {"rank": "6", "before": "b7", "after": "b3p3"}]}} {"example_id": "perception_01172", "split": "perception", "task_type": "state_tracking", "fen": "8/p1p5/2p3pr/1pPk1p2/3P1P2/4P1N1/PP3PK1/8 w - - 1 32", "prompt": "Starting FEN: 8/p1p5/2p3pr/1pPk1p2/3P1P2/4P1N1/PP3PK1/8 w - - 1 32\nAfter the moves b2b4, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 32\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 8/p1p5/2p3pr/1pPk1p2/1P1P1P2/4P1N1/P4PK1/8 b - - 0 32", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "b2b4", "_state_tracking_result": "8/p1p5/2p3pr/1pPk1p2/1P1P1P2/4P1N1/P4PK1/8 b - - 0 32"}} {"example_id": "perception_01173", "split": "perception", "task_type": "material_inventory", "fen": "r1bqkb1r/p2n1ppp/2p1pn2/4P3/1ppP4/2N2NP1/PP3PBP/R1BQ1RK1 b kq -", "prompt": "FEN: r1bqkb1r/p2n1ppp/2p1pn2/4P3/1ppP4/2N2NP1/PP3PBP/R1BQ1RK1 b kq -\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=d1; rook=a1,f1; bishop=c1,g2; knight=c3,f3; pawn=a2,b2,f2,h2,g3,d4,e5.\nBlack inventory: king=e8; queen=d8; rook=a8,h8; bishop=c8,f8; knight=f6,d7; pawn=b4,c4,c6,e6,a7,f7,g7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01174", "split": "perception", "task_type": "material_piece_counts", "fen": "1k1r1b1r/ppp1qpp1/8/1P6/Q2p4/P2P1BP1/4P2P/R4RK1 b - - 0 20", "prompt": "FEN: 1k1r1b1r/ppp1qpp1/8/1P6/Q2p4/P2P1BP1/4P2P/R4RK1 b - - 0 20\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=1; knight=0; pawn=6.\nBlack counts: king=1; queen=1; rook=2; bishop=1; knight=0; pawn=6.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01175", "split": "perception", "task_type": "material_value_totals", "fen": "4r3/1pR5/p1b3k1/8/PP4p1/2N5/6P1/6K1 w - -", "prompt": "FEN: 4r3/1pR5/p1b3k1/8/PP4p1/2N5/6P1/6K1 w - -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=5; bishop=0; knight=3; pawn=3; total=11.\nBlack values: king=0; queen=0; rook=5; bishop=3; knight=0; pawn=3; total=11.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01176", "split": "perception", "task_type": "material_balance_trace", "fen": "5Q2/8/8/1p4Q1/pP6/K7/6k1/8 b - - 3 67", "prompt": "FEN: 5Q2/8/8/1p4Q1/pP6/K7/6k1/8 b - - 3 67\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=a3; queen=g5,f8; rook=none; bishop=none; knight=none; pawn=b4 | black king=g2; queen=none; rook=none; bishop=none; knight=none; pawn=a4,b5\nCounts: white king=1; queen=2; rook=0; bishop=0; knight=0; pawn=1 | black king=1; queen=0; rook=0; bishop=0; knight=0; pawn=2\nValues: white total=19; black total=2\nBalance: White is up 17 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01177", "split": "perception", "task_type": "multi_state_tracking", "fen": "r1bq1rk1/1p2npp1/p1np3p/5P2/3P3N/2P5/P3B1PP/R1BQ1RK1 b - - 0 13", "prompt": "Starting FEN: r1bq1rk1/1p2npp1/p1np3p/5P2/3P3N/2P5/P3B1PP/R1BQ1RK1 b - - 0 13\nAfter the moves d8e8 c1f4 c6d4, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 13\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r1b1qrk1/1p2npp1/p2p3p/5P2/3n1B1N/2P5/P3B1PP/R2Q1RK1 w - - 0 15", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "d8e8 c1f4 c6d4", "_multi_state_tracking_result": "r1b1qrk1/1p2npp1/p2p3p/5P2/3n1B1N/2P5/P3B1PP/R2Q1RK1 w - - 0 15", "diagnostic": true, "hard_gate": false, "moves": "d8e8 c1f4 c6d4"}} {"example_id": "perception_01178", "split": "perception", "task_type": "board_print", "fen": "6q1/pp1kn2p/4pQ2/1NppPp2/3P4/2P5/PP1R2PP/6K1 w - - 4 27", "prompt": "Position (FEN): 6q1/pp1kn2p/4pQ2/1NppPp2/3P4/2P5/PP1R2PP/6K1 w - - 4 27\nShow me the board.", "gold_answer": "8 . . . . . . q .\n7 p p . k n . . p\n6 . . . . p Q . .\n5 . N p p P p . .\n4 . . . P . . . .\n3 . . P . . . . .\n2 P P . R . . P P\n1 . . . . . . K .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01179", "split": "perception", "task_type": "board_to_fen", "fen": "r4r2/ppp2p1k/2n1b1p1/3ppq2/4N3/2PQB2P/P1P2PP1/1R3RK1 w - - 0 17", "prompt": "Here is the current board:\n8 r . . . . r . .\n7 p p p . . p . k\n6 . . n . b . p .\n5 . . . p p q . .\n4 . . . . N . . .\n3 . . P Q B . . P\n2 P . P . . P P .\n1 . R . . . R K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 17\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r4r2/ppp2p1k/2n1b1p1/3ppq2/4N3/2PQB2P/P1P2PP1/1R3RK1 w - - 0 17", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01180", "split": "perception", "task_type": "piece_id", "fen": "6rk/pp1q1p2/2r5/3p1p2/3P1P2/1P1QP1P1/P6P/2R2RK1 b - - 2 25", "prompt": "FEN: 6rk/pp1q1p2/2r5/3p1p2/3P1P2/1P1QP1P1/P6P/2R2RK1 b - - 2 25\nWhat piece is on d5?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "d5"}} {"example_id": "perception_01181", "split": "perception", "task_type": "material_count", "fen": "r5R1/2Q1k3/p2p4/4p3/8/2PqB2p/PP3P2/4K3 b - - 0 34", "prompt": "FEN: r5R1/2Q1k3/p2p4/4p3/8/2PqB2p/PP3P2/4K3 b - - 0 34\nWhat is the material count for both sides?", "gold_answer": "White (8 pieces): 1 bishop, 1 king, 4 pawns, 1 queen, 1 rook. Black (7 pieces): 1 king, 4 pawns, 1 queen, 1 rook. White is up 3 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01182", "split": "perception", "task_type": "square_lookup", "fen": "rnbqk2r/p3ppbp/2pp2p1/7P/1p1Pn3/1B3N2/PPP1NPP1/R1BQK2R b KQkq - 1 9", "prompt": "FEN: rnbqk2r/p3ppbp/2pp2p1/7P/1p1Pn3/1B3N2/PPP1NPP1/R1BQK2R b KQkq - 1 9\nWhat is on e2?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "e2=white knight", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "e2", "diagnostic": true, "hard_gate": false, "square": "e2"}} {"example_id": "perception_01183", "split": "perception", "task_type": "rank_lookup", "fen": "rnbqkbnr/pp3ppp/4p3/3p4/3Q1B2/2N3P1/PPP1PP1P/R3KBNR b KQkq - 0 5", "prompt": "FEN: rnbqkbnr/pp3ppp/4p3/3p4/3Q1B2/2N3P1/PPP1PP1P/R3KBNR b KQkq - 0 5\nWhat is the compressed FEN row for rank 4?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 4: 3Q1B2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "4", "_rank_lookup_row": "3Q1B2", "diagnostic": true, "hard_gate": false, "rank": "4", "fen_rank_row": "3Q1B2"}} {"example_id": "perception_01184", "split": "perception", "task_type": "square_coordinates", "fen": "2k5/p5r1/4n3/2pR4/P7/1PPK4/3N4/8 w - - 1 36", "prompt": "FEN: 2k5/p5r1/4n3/2pR4/P7/1PPK4/3N4/8 w - - 1 36\nFor square h8, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "h8: file=h; rank=8; fen_row_from_top=1; file_index=8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "h8", "diagnostic": true, "hard_gate": false, "square": "h8"}} {"example_id": "perception_01185", "split": "perception", "task_type": "fen_rank_expansion", "fen": "8/3bq1pk/Q1p1p2p/3nPp2/3P4/P4N2/2B2PPP/r1B2RK1 w - - 5 30", "prompt": "FEN: 8/3bq1pk/Q1p1p2p/3nPp2/3P4/P4N2/2B2PPP/r1B2RK1 w - - 5 30\nCompressed rank 8 row: 8\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 8: a=1; b=1; c=1; d=1; e=1; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "8", "_fen_rank_expansion_row": "8", "diagnostic": true, "hard_gate": false, "rank": "8", "fen_rank_row": "8"}} {"example_id": "perception_01186", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "7R/8/8/8/2k5/8/6PK/8 b - - 0 77", "prompt": "Rank 4 row before: 2k5\nFile c changes from k to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 4: 2k5 -> 8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "c4c5", "_fen_rank_cell_edit_square": "c4", "_fen_rank_cell_edit_rank": "4", "_fen_rank_cell_edit_file": "c", "_fen_rank_cell_edit_before_row": "2k5", "_fen_rank_cell_edit_after_row": "8", "_fen_rank_cell_edit_before_fen": "k", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "c4c5", "square": "c4", "rank": "4", "file": "c", "before_row": "2k5", "after_row": "8", "before_fen": "k", "after_fen": "1"}} {"example_id": "perception_01187", "split": "perception", "task_type": "fen_board_edit", "fen": "2r1r1k1/1p4pp/2p2p2/3n4/p2P4/P4NP1/1PR2P1P/4RK2 b - -", "prompt": "Board FEN before: 2r1r1k1/1p4pp/2p2p2/3n4/p2P4/P4NP1/1PR2P1P/4RK2\nApply square edits: d5 n->1; b4 1->n\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 2r1r1k1/1p4pp/2p2p2/8/pn1P4/P4NP1/1PR2P1P/4RK2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "d5b4", "_fen_board_edit_board_fen_before": "2r1r1k1/1p4pp/2p2p2/3n4/p2P4/P4NP1/1PR2P1P/4RK2", "_fen_board_edit_board_fen_after": "2r1r1k1/1p4pp/2p2p2/8/pn1P4/P4NP1/1PR2P1P/4RK2", "_fen_board_edit_edit_text": "d5 n->1; b4 1->n", "_fen_board_edit_changed_squares": [{"square": "d5", "before": "black knight", "after": "empty", "before_fen": "n", "after_fen": "1"}, {"square": "b4", "before": "empty", "after": "black knight", "before_fen": "1", "after_fen": "n"}], "diagnostic": true, "hard_gate": false, "move": "d5b4", "board_fen_before": "2r1r1k1/1p4pp/2p2p2/3n4/p2P4/P4NP1/1PR2P1P/4RK2", "board_fen_after": "2r1r1k1/1p4pp/2p2p2/8/pn1P4/P4NP1/1PR2P1P/4RK2", "edit_text": "d5 n->1; b4 1->n", "changed_squares": [{"square": "d5", "before": "black knight", "after": "empty", "before_fen": "n", "after_fen": "1"}, {"square": "b4", "before": "empty", "after": "black knight", "before_fen": "1", "after_fen": "n"}]}} {"example_id": "perception_01188", "split": "perception", "task_type": "move_square_edits", "fen": "r4k2/1p1b4/p2p2Q1/2pPq1P1/P3N2p/8/1P3N1P/5BK1 w - -", "prompt": "Starting FEN: r4k2/1p1b4/p2p2Q1/2pPq1P1/P3N2p/8/1P3N1P/5BK1 w - -\nMove: g6e8\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: g6=white queen; e8=empty.\nSquares: g6 white queen->empty; e8 empty->white queen.\nRanks: rank 6 g Q->1; rank 8 e 1->Q.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "g6e8", "diagnostic": true, "hard_gate": false, "move": "g6e8"}} {"example_id": "perception_01189", "split": "perception", "task_type": "fen_assembly", "fen": "2k1r3/3r2pp/2pBp3/R3P3/2b5/2P5/2P3PP/4K2R w K - 0 25", "prompt": "Starting FEN: 2k1r3/3r2pp/2pBp3/R3P3/2b5/2P5/2P3PP/4K2R w K - 0 25\nMove: d6b8\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: K\nEn passant: none\nHalfmove clock: 0\nFullmove number: 25\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white bishop d6b8.\nLookup: d6=white bishop; b8=empty.\nSquares: d6 white bishop->empty; b8 empty->white bishop.\nRanks: rank 6 d B->1; rank 8 b 1->B.\nResult FEN: 1Bk1r3/3r2pp/2p1p3/R3P3/2b5/2P5/2P3PP/4K2R b K - 1 25", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "d6b8", "diagnostic": true, "hard_gate": false, "move": "d6b8"}} {"example_id": "perception_01190", "split": "perception", "task_type": "fen_row_application", "fen": "r4r2/5pkp/p2p2p1/1p2q3/1P1nP3/8/P1B2PPP/R2QR1K1 b - - 5 25", "prompt": "Starting FEN: r4r2/5pkp/p2p2p1/1p2q3/1P1nP3/8/P1B2PPP/R2QR1K1 b - - 5 25\nMove: e5f5\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 5\nFullmove number: 25\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 5 1p2q3->1p3q2.\nResult FEN: r4r2/5pkp/p2p2p1/1p3q2/1P1nP3/8/P1B2PPP/R2QR1K1 w - - 6 26", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "e5f5", "_fen_row_application_rank_rewrites": [{"rank": "5", "before": "1p2q3", "after": "1p3q2"}], "diagnostic": true, "hard_gate": false, "move": "e5f5", "rank_rewrites": [{"rank": "5", "before": "1p2q3", "after": "1p3q2"}]}} {"example_id": "perception_01191", "split": "perception", "task_type": "state_tracking", "fen": "1r2r1k1/R4R2/3Bpb2/8/1P3P2/8/4N2P/5K2 b - - 3 35", "prompt": "Starting FEN: 1r2r1k1/R4R2/3Bpb2/8/1P3P2/8/4N2P/5K2 b - - 3 35\nAfter the moves e8e7, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 3\nFullmove number: 35\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 1r4k1/R3rR2/3Bpb2/8/1P3P2/8/4N2P/5K2 w - - 4 36", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "e8e7", "_state_tracking_result": "1r4k1/R3rR2/3Bpb2/8/1P3P2/8/4N2P/5K2 w - - 4 36"}} {"example_id": "perception_01192", "split": "perception", "task_type": "material_inventory", "fen": "r2qkb1r/1pp1pppp/p1n2n2/3p1b2/3P1B2/4PN1P/PPP2PP1/RN1QKB1R w KQkq -", "prompt": "FEN: r2qkb1r/1pp1pppp/p1n2n2/3p1b2/3P1B2/4PN1P/PPP2PP1/RN1QKB1R w KQkq -\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=e1; queen=d1; rook=a1,h1; bishop=f1,f4; knight=b1,f3; pawn=a2,b2,c2,f2,g2,e3,h3,d4.\nBlack inventory: king=e8; queen=d8; rook=a8,h8; bishop=f5,f8; knight=c6,f6; pawn=d5,a6,b7,c7,e7,f7,g7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01193", "split": "perception", "task_type": "material_piece_counts", "fen": "8/1pp3k1/p2p2p1/P2Pp3/1P2P3/4Bq2/2PK3r/R1Q5 w - - 2 42", "prompt": "FEN: 8/1pp3k1/p2p2p1/P2Pp3/1P2P3/4Bq2/2PK3r/R1Q5 w - - 2 42\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=1; bishop=1; knight=0; pawn=5.\nBlack counts: king=1; queen=1; rook=1; bishop=0; knight=0; pawn=6.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01194", "split": "perception", "task_type": "material_value_totals", "fen": "3k3r/1p3R2/p1p3pp/8/PPr5/2N3P1/8/3R2K1 b - - 3 31", "prompt": "FEN: 3k3r/1p3R2/p1p3pp/8/PPr5/2N3P1/8/3R2K1 b - - 3 31\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=10; bishop=0; knight=3; pawn=3; total=16.\nBlack values: king=0; queen=0; rook=10; bishop=0; knight=0; pawn=5; total=15.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01195", "split": "perception", "task_type": "material_balance_trace", "fen": "rn2k1r1/1p1bq2p/1pp1p1pB/8/P3P3/2P5/3QB1nP/RN2K1NR w KQq - 0 17", "prompt": "FEN: rn2k1r1/1p1bq2p/1pp1p1pB/8/P3P3/2P5/3QB1nP/RN2K1NR w KQq - 0 17\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=e1; queen=d2; rook=a1,h1; bishop=e2,h6; knight=b1,g1; pawn=h2,c3,a4,e4 | black king=e8; queen=e7; rook=a8,g8; bishop=d7; knight=g2,b8; pawn=b6,c6,e6,g6,b7,h7\nCounts: white king=1; queen=1; rook=2; bishop=2; knight=2; pawn=4 | black king=1; queen=1; rook=2; bishop=1; knight=2; pawn=6\nValues: white total=35; black total=34\nBalance: White is up 1 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01196", "split": "perception", "task_type": "multi_state_tracking", "fen": "r1b1Q1k1/ppqp2p1/2n1n2p/3B4/8/2P5/PPP3PP/5RK1 b - -", "prompt": "Starting FEN: r1b1Q1k1/ppqp2p1/2n1n2p/3B4/8/2P5/PPP3PP/5RK1 b - - 0 1\nAfter the moves g8h7 a2a3, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r1b1Q3/ppqp2pk/2n1n2p/3B4/8/P1P5/1PP3PP/5RK1 b - - 0 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "g8h7 a2a3", "_multi_state_tracking_result": "r1b1Q3/ppqp2pk/2n1n2p/3B4/8/P1P5/1PP3PP/5RK1 b - - 0 2", "diagnostic": true, "hard_gate": false, "moves": "g8h7 a2a3"}} {"example_id": "perception_01197", "split": "perception", "task_type": "board_print", "fen": "8/pp4pp/3pk3/8/QKr1q1bP/3r4/PP6/R3R3 w - - 0 28", "prompt": "Position (FEN): 8/pp4pp/3pk3/8/QKr1q1bP/3r4/PP6/R3R3 w - - 0 28\nShow me the board.", "gold_answer": "8 . . . . . . . .\n7 p p . . . . p p\n6 . . . p k . . .\n5 . . . . . . . .\n4 Q K r . q . b P\n3 . . . r . . . .\n2 P P . . . . . .\n1 R . . . R . . .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01198", "split": "perception", "task_type": "board_to_fen", "fen": "r1bqkb1r/p1pppppp/1pn2n2/8/3P4/5N1P/PPP1PPP1/RNBQKB1R w KQkq - 0 4", "prompt": "Here is the current board:\n8 r . b q k b . r\n7 p . p p p p p p\n6 . p n . . n . .\n5 . . . . . . . .\n4 . . . P . . . .\n3 . . . . . N . P\n2 P P P . P P P .\n1 R N B Q K B . R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 4\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r1bqkb1r/p1pppppp/1pn2n2/8/3P4/5N1P/PPP1PPP1/RNBQKB1R w KQkq - 0 4", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01199", "split": "perception", "task_type": "piece_id", "fen": "2kr3r/2q1npp1/p1p1N2p/1pp1p3/4P3/2NP4/PPP2PPP/R2Q1RK1 b - - 0 13", "prompt": "FEN: 2kr3r/2q1npp1/p1p1N2p/1pp1p3/4P3/2NP4/PPP2PPP/R2Q1RK1 b - - 0 13\nWhat piece is on c2?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "c2"}} {"example_id": "perception_01200", "split": "perception", "task_type": "material_count", "fen": "r3k2r/pp3ppp/3p4/2P1p3/4P2P/3b1PP1/1P1BNnB1/qNKR3R w kq - 3 20", "prompt": "FEN: r3k2r/pp3ppp/3p4/2P1p3/4P2P/3b1PP1/1P1BNnB1/qNKR3R w kq - 3 20\nWhat is the material count for both sides?", "gold_answer": "White (13 pieces): 2 bishops, 1 king, 2 knights, 6 pawns, 2 rooks. Black (13 pieces): 1 bishop, 1 king, 1 knight, 7 pawns, 1 queen, 2 rooks. Black is up 4 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01201", "split": "perception", "task_type": "square_lookup", "fen": "5QB1/8/8/6k1/8/4K3/8/8 w - -", "prompt": "FEN: 5QB1/8/8/6k1/8/4K3/8/8 w - -\nWhat is on g7?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "g7=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "g7", "diagnostic": true, "hard_gate": false, "square": "g7"}} {"example_id": "perception_01202", "split": "perception", "task_type": "rank_lookup", "fen": "5rk1/2pq1pp1/2n1p2p/8/1Q1PP3/5N2/5PPP/R5K1 w - - 1 22", "prompt": "FEN: 5rk1/2pq1pp1/2n1p2p/8/1Q1PP3/5N2/5PPP/R5K1 w - - 1 22\nWhat is the compressed FEN row for rank 4?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 4: 1Q1PP3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "4", "_rank_lookup_row": "1Q1PP3", "diagnostic": true, "hard_gate": false, "rank": "4", "fen_rank_row": "1Q1PP3"}} {"example_id": "perception_01203", "split": "perception", "task_type": "square_coordinates", "fen": "q4rk1/1Qp2p1p/4p1p1/p3P3/P2P4/2P5/6PP/1R4K1 b - - 9 32", "prompt": "FEN: q4rk1/1Qp2p1p/4p1p1/p3P3/P2P4/2P5/6PP/1R4K1 b - - 9 32\nFor square c3, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "c3: file=c; rank=3; fen_row_from_top=6; file_index=3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "c3", "diagnostic": true, "hard_gate": false, "square": "c3"}} {"example_id": "perception_01204", "split": "perception", "task_type": "fen_rank_expansion", "fen": "rnbqk1nr/ppp2ppp/3bp3/8/2BP4/5Q2/PPP2PPP/RNB1K1NR w KQkq - 1 6", "prompt": "FEN: rnbqk1nr/ppp2ppp/3bp3/8/2BP4/5Q2/PPP2PPP/RNB1K1NR w KQkq - 1 6\nCompressed rank 1 row: RNB1K1NR\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 1: a=R; b=N; c=B; d=1; e=K; f=1; g=N; h=R", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "1", "_fen_rank_expansion_row": "RNB1K1NR", "diagnostic": true, "hard_gate": false, "rank": "1", "fen_rank_row": "RNB1K1NR"}} {"example_id": "perception_01205", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "2BN4/k1K5/8/8/8/8/8/8 w - -", "prompt": "Rank 8 row before: 2BN4\nFile c changes from B to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 8: 2BN4 -> 3N4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "c8d7", "_fen_rank_cell_edit_square": "c8", "_fen_rank_cell_edit_rank": "8", "_fen_rank_cell_edit_file": "c", "_fen_rank_cell_edit_before_row": "2BN4", "_fen_rank_cell_edit_after_row": "3N4", "_fen_rank_cell_edit_before_fen": "B", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "c8d7", "square": "c8", "rank": "8", "file": "c", "before_row": "2BN4", "after_row": "3N4", "before_fen": "B", "after_fen": "1"}} {"example_id": "perception_01206", "split": "perception", "task_type": "fen_board_edit", "fen": "r1b4r/4kp2/2p1pNp1/1p1Bq3/7p/2P5/P4PPP/R1B1R1K1 w - - 0 23", "prompt": "Board FEN before: r1b4r/4kp2/2p1pNp1/1p1Bq3/7p/2P5/P4PPP/R1B1R1K1\nApply square edits: d5 B->1; c6 p->B\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: r1b4r/4kp2/2B1pNp1/1p2q3/7p/2P5/P4PPP/R1B1R1K1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "d5c6", "_fen_board_edit_board_fen_before": "r1b4r/4kp2/2p1pNp1/1p1Bq3/7p/2P5/P4PPP/R1B1R1K1", "_fen_board_edit_board_fen_after": "r1b4r/4kp2/2B1pNp1/1p2q3/7p/2P5/P4PPP/R1B1R1K1", "_fen_board_edit_edit_text": "d5 B->1; c6 p->B", "_fen_board_edit_changed_squares": [{"square": "d5", "before": "white bishop", "after": "empty", "before_fen": "B", "after_fen": "1"}, {"square": "c6", "before": "black pawn", "after": "white bishop", "before_fen": "p", "after_fen": "B"}], "diagnostic": true, "hard_gate": false, "move": "d5c6", "board_fen_before": "r1b4r/4kp2/2p1pNp1/1p1Bq3/7p/2P5/P4PPP/R1B1R1K1", "board_fen_after": "r1b4r/4kp2/2B1pNp1/1p2q3/7p/2P5/P4PPP/R1B1R1K1", "edit_text": "d5 B->1; c6 p->B", "changed_squares": [{"square": "d5", "before": "white bishop", "after": "empty", "before_fen": "B", "after_fen": "1"}, {"square": "c6", "before": "black pawn", "after": "white bishop", "before_fen": "p", "after_fen": "B"}]}} {"example_id": "perception_01207", "split": "perception", "task_type": "move_square_edits", "fen": "r2R2k1/pp3ppp/4b3/8/8/q4NP1/P3QP1P/R5K1 b - - 0 18", "prompt": "Starting FEN: r2R2k1/pp3ppp/4b3/8/8/q4NP1/P3QP1P/R5K1 b - - 0 18\nMove: a3f8\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: a3=black queen; f8=empty.\nSquares: a3 black queen->empty; f8 empty->black queen.\nRanks: rank 3 a q->1; rank 8 f 1->q.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "a3f8", "diagnostic": true, "hard_gate": false, "move": "a3f8"}} {"example_id": "perception_01208", "split": "perception", "task_type": "fen_assembly", "fen": "r3r1k1/1p2b1p1/pq1p1pnp/3P4/3NPp2/P1N4P/1P1QBP2/1R3RK1 w - - 1 23", "prompt": "Starting FEN: r3r1k1/1p2b1p1/pq1p1pnp/3P4/3NPp2/P1N4P/1P1QBP2/1R3RK1 w - - 1 23\nMove: e2a6\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 23\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white bishop e2a6. Captures black pawn on a6.\nLookup: e2=white bishop; a6=black pawn.\nSquares: e2 white bishop->empty; a6 black pawn->white bishop.\nRanks: rank 2 e B->1; rank 6 a p->B.\nResult FEN: r3r1k1/1p2b1p1/Bq1p1pnp/3P4/3NPp2/P1N4P/1P1Q1P2/1R3RK1 b - - 0 23", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "e2a6", "diagnostic": true, "hard_gate": false, "move": "e2a6"}} {"example_id": "perception_01209", "split": "perception", "task_type": "fen_row_application", "fen": "4k3/1r6/8/3Bp2p/1BP1Pb2/3P3P/4KP2/8 w - - 0 45", "prompt": "Starting FEN: 4k3/1r6/8/3Bp2p/1BP1Pb2/3P3P/4KP2/8 w - - 0 45\nMove: d5e6\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 45\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 5 3Bp2p->4p2p; rank 6 8->4B3.\nResult FEN: 4k3/1r6/4B3/4p2p/1BP1Pb2/3P3P/4KP2/8 b - - 1 45", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "d5e6", "_fen_row_application_rank_rewrites": [{"rank": "5", "before": "3Bp2p", "after": "4p2p"}, {"rank": "6", "before": "8", "after": "4B3"}], "diagnostic": true, "hard_gate": false, "move": "d5e6", "rank_rewrites": [{"rank": "5", "before": "3Bp2p", "after": "4p2p"}, {"rank": "6", "before": "8", "after": "4B3"}]}} {"example_id": "perception_01210", "split": "perception", "task_type": "state_tracking", "fen": "5rk1/p1b2p1p/1pp1r1p1/P7/1P1R2P1/2P1P3/1K1B3P/5R2 w - - 0 29", "prompt": "Starting FEN: 5rk1/p1b2p1p/1pp1r1p1/P7/1P1R2P1/2P1P3/1K1B3P/5R2 w - - 0 29\nAfter the moves d2e1, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 29\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 5rk1/p1b2p1p/1pp1r1p1/P7/1P1R2P1/2P1P3/1K5P/4BR2 b - - 1 29", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "d2e1", "_state_tracking_result": "5rk1/p1b2p1p/1pp1r1p1/P7/1P1R2P1/2P1P3/1K5P/4BR2 b - - 1 29"}} {"example_id": "perception_01211", "split": "perception", "task_type": "material_inventory", "fen": "r4rk1/pppn1p1p/3p1qp1/3P4/3N4/4P3/PP3PPP/R2QKB1R b KQ - 2 12", "prompt": "FEN: r4rk1/pppn1p1p/3p1qp1/3P4/3N4/4P3/PP3PPP/R2QKB1R b KQ - 2 12\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=e1; queen=d1; rook=a1,h1; bishop=f1; knight=d4; pawn=a2,b2,f2,g2,h2,e3,d5.\nBlack inventory: king=g8; queen=f6; rook=a8,f8; bishop=none; knight=d7; pawn=d6,g6,a7,b7,c7,f7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01212", "split": "perception", "task_type": "material_piece_counts", "fen": "8/8/6Pk/p4P2/P5K1/8/8/2b5 w - -", "prompt": "FEN: 8/8/6Pk/p4P2/P5K1/8/8/2b5 w - -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=0; bishop=0; knight=0; pawn=3.\nBlack counts: king=1; queen=0; rook=0; bishop=1; knight=0; pawn=1.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01213", "split": "perception", "task_type": "material_value_totals", "fen": "r1b1k2r/ppp2p1p/2n2p2/3qp3/3P4/P1P1P3/5PPP/R2QKBNR b KQkq -", "prompt": "FEN: r1b1k2r/ppp2p1p/2n2p2/3qp3/3P4/P1P1P3/5PPP/R2QKBNR b KQkq -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=3; knight=3; pawn=7; total=32.\nBlack values: king=0; queen=9; rook=10; bishop=3; knight=3; pawn=7; total=32.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01214", "split": "perception", "task_type": "material_balance_trace", "fen": "Qn3rk1/p1p3pp/8/3Pp2q/5Pbb/3PPN1n/PP2K2P/RNB4R w - - 1 18", "prompt": "FEN: Qn3rk1/p1p3pp/8/3Pp2q/5Pbb/3PPN1n/PP2K2P/RNB4R w - - 1 18\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=e2; queen=a8; rook=a1,h1; bishop=c1; knight=b1,f3; pawn=a2,b2,h2,d3,e3,f4,d5 | black king=g8; queen=h5; rook=f8; bishop=g4,h4; knight=h3,b8; pawn=e5,a7,c7,g7,h7\nCounts: white king=1; queen=1; rook=2; bishop=1; knight=2; pawn=7 | black king=1; queen=1; rook=1; bishop=2; knight=2; pawn=5\nValues: white total=35; black total=31\nBalance: White is up 4 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01215", "split": "perception", "task_type": "multi_state_tracking", "fen": "5rk1/Qbq3pp/1p1r1p2/3pp3/8/1P4P1/P1P1PP1P/R3K1NR w KQ - 0 20", "prompt": "Starting FEN: 5rk1/Qbq3pp/1p1r1p2/3pp3/8/1P4P1/P1P1PP1P/R3K1NR w KQ - 0 20\nAfter the moves e1f1 c7c5, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 0\nFullmove number: 20\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 5rk1/Qb4pp/1p1r1p2/2qpp3/8/1P4P1/P1P1PP1P/R4KNR w - - 2 21", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "e1f1 c7c5", "_multi_state_tracking_result": "5rk1/Qb4pp/1p1r1p2/2qpp3/8/1P4P1/P1P1PP1P/R4KNR w - - 2 21", "diagnostic": true, "hard_gate": false, "moves": "e1f1 c7c5"}} {"example_id": "perception_01216", "split": "perception", "task_type": "board_print", "fen": "r2qk2r/pp1nppb1/3p2pp/2p5/3nP3/2NPB3/PPPQ1PPP/R3NRK1 b kq -", "prompt": "Position (FEN): r2qk2r/pp1nppb1/3p2pp/2p5/3nP3/2NPB3/PPPQ1PPP/R3NRK1 b kq -\nShow me the board.", "gold_answer": "8 r . . q k . . r\n7 p p . n p p b .\n6 . . . p . . p p\n5 . . p . . . . .\n4 . . . n P . . .\n3 . . N P B . . .\n2 P P P Q . P P P\n1 R . . . N R K .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01217", "split": "perception", "task_type": "board_to_fen", "fen": "r3n1k1/p1q2pbp/1pb1p1p1/2p5/2P1P3/2N1BP2/PP1RB1PP/3Q2K1 w - -", "prompt": "Here is the current board:\n8 r . . . n . k .\n7 p . q . . p b p\n6 . p b . p . p .\n5 . . p . . . . .\n4 . . P . P . . .\n3 . . N . B P . .\n2 P P . R B . P P\n1 . . . Q . . K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r3n1k1/p1q2pbp/1pb1p1p1/2p5/2P1P3/2N1BP2/PP1RB1PP/3Q2K1 w - - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01218", "split": "perception", "task_type": "piece_id", "fen": "r1bqk1nr/pppp2pp/5p2/2b1p3/2QPP3/2P2N2/P4PPP/RNB1K2R b KQkq -", "prompt": "FEN: r1bqk1nr/pppp2pp/5p2/2b1p3/2QPP3/2P2N2/P4PPP/RNB1K2R b KQkq -\nWhat piece is on b7?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "b7"}} {"example_id": "perception_01219", "split": "perception", "task_type": "material_count", "fen": "6k1/R7/6p1/7p/8/5KPP/1r3P2/8 b - -", "prompt": "FEN: 6k1/R7/6p1/7p/8/5KPP/1r3P2/8 b - -\nWhat is the material count for both sides?", "gold_answer": "White (5 pieces): 1 king, 3 pawns, 1 rook. Black (4 pieces): 1 king, 2 pawns, 1 rook. White is up 1 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01220", "split": "perception", "task_type": "square_lookup", "fen": "r6r/1Q4k1/1p1NR1pp/5n2/2Pb4/8/PP3PPP/1R4K1 b - - 2 26", "prompt": "FEN: r6r/1Q4k1/1p1NR1pp/5n2/2Pb4/8/PP3PPP/1R4K1 b - - 2 26\nWhat is on g2?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "g2=white pawn", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "g2", "diagnostic": true, "hard_gate": false, "square": "g2"}} {"example_id": "perception_01221", "split": "perception", "task_type": "rank_lookup", "fen": "rnbqk2r/ppp1bppp/3ppn2/8/3PPP2/4BNP1/PPP4P/RN1QKB1R w KQkq - 3 7", "prompt": "FEN: rnbqk2r/ppp1bppp/3ppn2/8/3PPP2/4BNP1/PPP4P/RN1QKB1R w KQkq - 3 7\nWhat is the compressed FEN row for rank 5?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 5: 8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "5", "_rank_lookup_row": "8", "diagnostic": true, "hard_gate": false, "rank": "5", "fen_rank_row": "8"}} {"example_id": "perception_01222", "split": "perception", "task_type": "square_coordinates", "fen": "3r1r2/pp4pk/2p1pn1p/4N3/4nP2/4B2P/PPP3P1/R4RK1 w - - 1 23", "prompt": "FEN: 3r1r2/pp4pk/2p1pn1p/4N3/4nP2/4B2P/PPP3P1/R4RK1 w - - 1 23\nFor square e6, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "e6: file=e; rank=6; fen_row_from_top=3; file_index=5", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "e6", "diagnostic": true, "hard_gate": false, "square": "e6"}} {"example_id": "perception_01223", "split": "perception", "task_type": "fen_rank_expansion", "fen": "rnbqkb1r/pppp4/5n1p/5ppN/2PPp3/6P1/PP2PP1P/RNBQKB1R w KQkq -", "prompt": "FEN: rnbqkb1r/pppp4/5n1p/5ppN/2PPp3/6P1/PP2PP1P/RNBQKB1R w KQkq -\nCompressed rank 2 row: PP2PP1P\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 2: a=P; b=P; c=1; d=1; e=P; f=P; g=1; h=P", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "2", "_fen_rank_expansion_row": "PP2PP1P", "diagnostic": true, "hard_gate": false, "rank": "2", "fen_rank_row": "PP2PP1P"}} {"example_id": "perception_01224", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r1b1nr1k/1q2bpp1/p3p2p/3pB3/3R4/2N3Q1/PPP1BPPP/2K4R w - -", "prompt": "Rank 1 row before: 2K4R\nFile c changes from K to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 1: 2K4R -> 3K3R", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "c1d1", "_fen_rank_cell_edit_square": "c1", "_fen_rank_cell_edit_rank": "1", "_fen_rank_cell_edit_file": "c", "_fen_rank_cell_edit_before_row": "2K4R", "_fen_rank_cell_edit_after_row": "3K3R", "_fen_rank_cell_edit_before_fen": "K", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "c1d1", "square": "c1", "rank": "1", "file": "c", "before_row": "2K4R", "after_row": "3K3R", "before_fen": "K", "after_fen": "1"}} {"example_id": "perception_01225", "split": "perception", "task_type": "fen_board_edit", "fen": "rn3rk1/p4p2/3p3p/1bpP2p1/2NqP3/1Q1B4/P4PPP/R4RK1 b - - 1 18", "prompt": "Board FEN before: rn3rk1/p4p2/3p3p/1bpP2p1/2NqP3/1Q1B4/P4PPP/R4RK1\nApply square edits: h6 p->1; h5 1->p\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: rn3rk1/p4p2/3p4/1bpP2pp/2NqP3/1Q1B4/P4PPP/R4RK1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "h6h5", "_fen_board_edit_board_fen_before": "rn3rk1/p4p2/3p3p/1bpP2p1/2NqP3/1Q1B4/P4PPP/R4RK1", "_fen_board_edit_board_fen_after": "rn3rk1/p4p2/3p4/1bpP2pp/2NqP3/1Q1B4/P4PPP/R4RK1", "_fen_board_edit_edit_text": "h6 p->1; h5 1->p", "_fen_board_edit_changed_squares": [{"square": "h6", "before": "black pawn", "after": "empty", "before_fen": "p", "after_fen": "1"}, {"square": "h5", "before": "empty", "after": "black pawn", "before_fen": "1", "after_fen": "p"}], "diagnostic": true, "hard_gate": false, "move": "h6h5", "board_fen_before": "rn3rk1/p4p2/3p3p/1bpP2p1/2NqP3/1Q1B4/P4PPP/R4RK1", "board_fen_after": "rn3rk1/p4p2/3p4/1bpP2pp/2NqP3/1Q1B4/P4PPP/R4RK1", "edit_text": "h6 p->1; h5 1->p", "changed_squares": [{"square": "h6", "before": "black pawn", "after": "empty", "before_fen": "p", "after_fen": "1"}, {"square": "h5", "before": "empty", "after": "black pawn", "before_fen": "1", "after_fen": "p"}]}} {"example_id": "perception_01226", "split": "perception", "task_type": "move_square_edits", "fen": "2kr1b1r/p1p1pppp/2p2n2/q4b2/3P4/2N5/PPPB1PPP/R2QK1NR w KQ - 0 9", "prompt": "Starting FEN: 2kr1b1r/p1p1pppp/2p2n2/q4b2/3P4/2N5/PPPB1PPP/R2QK1NR w KQ - 0 9\nMove: b2b3\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: b2=white pawn; b3=empty.\nSquares: b2 white pawn->empty; b3 empty->white pawn.\nRanks: rank 2 b P->1; rank 3 b 1->P.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "b2b3", "diagnostic": true, "hard_gate": false, "move": "b2b3"}} {"example_id": "perception_01227", "split": "perception", "task_type": "fen_assembly", "fen": "4n3/1Q1k4/8/4K3/8/8/8/8 b - -", "prompt": "Starting FEN: 4n3/1Q1k4/8/4K3/8/8/8/8 b - - 0 1\nMove: e8c7\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black knight e8c7.\nLookup: e8=black knight; c7=empty.\nSquares: e8 black knight->empty; c7 empty->black knight.\nRanks: rank 8 e n->1; rank 7 c 1->n.\nResult FEN: 8/1Qnk4/8/4K3/8/8/8/8 w - - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "e8c7", "diagnostic": true, "hard_gate": false, "move": "e8c7"}} {"example_id": "perception_01228", "split": "perception", "task_type": "fen_row_application", "fen": "r3kb1r/pp2nppp/1q2p3/1b1pP3/3P1P2/PB1n1N2/1P1K2PP/RNBQ3R b kq - 2 12", "prompt": "Starting FEN: r3kb1r/pp2nppp/1q2p3/1b1pP3/3P1P2/PB1n1N2/1P1K2PP/RNBQ3R b kq - 2 12\nMove: e8c8\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: kq\nEn passant: none\nHalfmove clock: 2\nFullmove number: 12\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 8 r3kb1r->2kr1b1r.\nResult FEN: 2kr1b1r/pp2nppp/1q2p3/1b1pP3/3P1P2/PB1n1N2/1P1K2PP/RNBQ3R w - - 3 13", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "e8c8", "_fen_row_application_rank_rewrites": [{"rank": "8", "before": "r3kb1r", "after": "2kr1b1r"}], "diagnostic": true, "hard_gate": false, "move": "e8c8", "rank_rewrites": [{"rank": "8", "before": "r3kb1r", "after": "2kr1b1r"}]}} {"example_id": "perception_01229", "split": "perception", "task_type": "state_tracking", "fen": "8/8/8/8/3p2r1/3K4/5Pk1/7R b - - 0 65", "prompt": "Starting FEN: 8/8/8/8/3p2r1/3K4/5Pk1/7R b - - 0 65\nAfter the moves g4g3, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 65\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 8/8/8/8/3p4/3K2r1/5Pk1/7R w - - 1 66", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "g4g3", "_state_tracking_result": "8/8/8/8/3p4/3K2r1/5Pk1/7R w - - 1 66"}} {"example_id": "perception_01230", "split": "perception", "task_type": "material_inventory", "fen": "rnbqk2r/pp2bpp1/4p2p/3p4/3NN1PP/4B3/PPP2P2/R2QKBR1 b Qkq -", "prompt": "FEN: rnbqk2r/pp2bpp1/4p2p/3p4/3NN1PP/4B3/PPP2P2/R2QKBR1 b Qkq -\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=e1; queen=d1; rook=a1,g1; bishop=f1,e3; knight=d4,e4; pawn=a2,b2,c2,f2,g4,h4.\nBlack inventory: king=e8; queen=d8; rook=a8,h8; bishop=e7,c8; knight=b8; pawn=d5,e6,h6,a7,b7,f7,g7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01231", "split": "perception", "task_type": "material_piece_counts", "fen": "3r3k/p1p3p1/1p4pp/8/1P2PP2/P5P1/7P/5RK1 w - - 0 28", "prompt": "FEN: 3r3k/p1p3p1/1p4pp/8/1P2PP2/P5P1/7P/5RK1 w - - 0 28\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=1; bishop=0; knight=0; pawn=6.\nBlack counts: king=1; queen=0; rook=1; bishop=0; knight=0; pawn=6.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01232", "split": "perception", "task_type": "material_value_totals", "fen": "8/p1p2b2/2p2P2/k1P5/3PK1B1/6P1/8/8 w - -", "prompt": "FEN: 8/p1p2b2/2p2P2/k1P5/3PK1B1/6P1/8/8 w - -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=0; bishop=3; knight=0; pawn=4; total=7.\nBlack values: king=0; queen=0; rook=0; bishop=3; knight=0; pawn=3; total=6.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01233", "split": "perception", "task_type": "material_balance_trace", "fen": "rnbqkbnr/p4ppp/2p1p3/2Np4/3P4/8/PP2PPPP/R1BQKBNR b KQkq - 0 6", "prompt": "FEN: rnbqkbnr/p4ppp/2p1p3/2Np4/3P4/8/PP2PPPP/R1BQKBNR b KQkq - 0 6\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=e1; queen=d1; rook=a1,h1; bishop=c1,f1; knight=g1,c5; pawn=a2,b2,e2,f2,g2,h2,d4 | black king=e8; queen=d8; rook=a8,h8; bishop=c8,f8; knight=b8,g8; pawn=d5,c6,e6,a7,f7,g7,h7\nCounts: white king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7 | black king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7\nValues: white total=38; black total=38\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01234", "split": "perception", "task_type": "multi_state_tracking", "fen": "8/8/1k6/4K3/Q7/8/8/8 w - -", "prompt": "Starting FEN: 8/8/1k6/4K3/Q7/8/8/8 w - - 0 1\nAfter the moves a4e4 b6c7, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 8/2k5/8/4K3/4Q3/8/8/8 w - - 2 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "a4e4 b6c7", "_multi_state_tracking_result": "8/2k5/8/4K3/4Q3/8/8/8 w - - 2 2", "diagnostic": true, "hard_gate": false, "moves": "a4e4 b6c7"}} {"example_id": "perception_01235", "split": "perception", "task_type": "board_print", "fen": "2kr4/ppb3p1/5n1p/nq6/3P4/1B2P3/PP3PPP/R1BK3R w - - 2 16", "prompt": "Position (FEN): 2kr4/ppb3p1/5n1p/nq6/3P4/1B2P3/PP3PPP/R1BK3R w - - 2 16\nShow me the board.", "gold_answer": "8 . . k r . . . .\n7 p p b . . . p .\n6 . . . . . n . p\n5 n q . . . . . .\n4 . . . P . . . .\n3 . B . . P . . .\n2 P P . . . P P P\n1 R . B K . . . R\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01236", "split": "perception", "task_type": "board_to_fen", "fen": "5bk1/7p/1p2p1pP/2p1Pp2/1pP2P2/qP1r1P2/P4Q1R/1K6 w - - 0 28", "prompt": "Here is the current board:\n8 . . . . . b k .\n7 . . . . . . . p\n6 . p . . p . p P\n5 . . p . P p . .\n4 . p P . . P . .\n3 q P . r . P . .\n2 P . . . . Q . R\n1 . K . . . . . .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 28\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "5bk1/7p/1p2p1pP/2p1Pp2/1pP2P2/qP1r1P2/P4Q1R/1K6 w - - 0 28", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01237", "split": "perception", "task_type": "piece_id", "fen": "rnbqk1nr/p4pp1/1pppp3/6N1/3PP2P/P7/1PP2P2/RN1QKB1R b KQkq - 0 9", "prompt": "FEN: rnbqk1nr/p4pp1/1pppp3/6N1/3PP2P/P7/1PP2P2/RN1QKB1R b KQkq - 0 9\nWhat piece is on c8?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black bishop", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "c8"}} {"example_id": "perception_01238", "split": "perception", "task_type": "material_count", "fen": "8/p4pkp/4n1p1/r7/2n5/P2NPP1P/5KP1/R7 b - - 2 31", "prompt": "FEN: 8/p4pkp/4n1p1/r7/2n5/P2NPP1P/5KP1/R7 b - - 2 31\nWhat is the material count for both sides?", "gold_answer": "White (8 pieces): 1 king, 1 knight, 5 pawns, 1 rook. Black (8 pieces): 1 king, 2 knights, 4 pawns, 1 rook. Black is up 2 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01239", "split": "perception", "task_type": "square_lookup", "fen": "r1b1k2r/ppq2pp1/2p2n1p/4b3/8/P1N2N2/1PP1B1PP/R2QK2R w KQkq - 0 16", "prompt": "FEN: r1b1k2r/ppq2pp1/2p2n1p/4b3/8/P1N2N2/1PP1B1PP/R2QK2R w KQkq - 0 16\nWhat is on e7?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "e7=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "e7", "diagnostic": true, "hard_gate": false, "square": "e7"}} {"example_id": "perception_01240", "split": "perception", "task_type": "rank_lookup", "fen": "r3k2r/pp2bpp1/2p1p3/4P3/4P1pP/3P4/PP4P1/2KR1B1R w kq -", "prompt": "FEN: r3k2r/pp2bpp1/2p1p3/4P3/4P1pP/3P4/PP4P1/2KR1B1R w kq -\nWhat is the compressed FEN row for rank 5?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 5: 4P3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "5", "_rank_lookup_row": "4P3", "diagnostic": true, "hard_gate": false, "rank": "5", "fen_rank_row": "4P3"}} {"example_id": "perception_01241", "split": "perception", "task_type": "square_coordinates", "fen": "3b1rk1/5pp1/2qnb2p/3p1N2/2pP2P1/R1P2QB1/P1B2PP1/6K1 b - -", "prompt": "FEN: 3b1rk1/5pp1/2qnb2p/3p1N2/2pP2P1/R1P2QB1/P1B2PP1/6K1 b - -\nFor square g1, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "g1: file=g; rank=1; fen_row_from_top=8; file_index=7", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "g1", "diagnostic": true, "hard_gate": false, "square": "g1"}} {"example_id": "perception_01242", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r1bqkb1r/1p2pppp/p1n2n2/3p2B1/3P4/2N2N2/PP2PPPP/R2QKB1R w KQkq -", "prompt": "FEN: r1bqkb1r/1p2pppp/p1n2n2/3p2B1/3P4/2N2N2/PP2PPPP/R2QKB1R w KQkq -\nCompressed rank 1 row: R2QKB1R\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 1: a=R; b=1; c=1; d=Q; e=K; f=B; g=1; h=R", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "1", "_fen_rank_expansion_row": "R2QKB1R", "diagnostic": true, "hard_gate": false, "rank": "1", "fen_rank_row": "R2QKB1R"}} {"example_id": "perception_01243", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "1kr2bnr/pb2nppp/1p2p3/8/3p4/PPN3P1/2QPPPBP/R3K1NR w KQ - 0 14", "prompt": "Rank 1 row before: R3K1NR\nFile c changes from 1 to R. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 1: R3K1NR -> 2R1K1NR", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "a1c1", "_fen_rank_cell_edit_square": "c1", "_fen_rank_cell_edit_rank": "1", "_fen_rank_cell_edit_file": "c", "_fen_rank_cell_edit_before_row": "R3K1NR", "_fen_rank_cell_edit_after_row": "2R1K1NR", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "R", "diagnostic": true, "hard_gate": false, "move": "a1c1", "square": "c1", "rank": "1", "file": "c", "before_row": "R3K1NR", "after_row": "2R1K1NR", "before_fen": "1", "after_fen": "R"}} {"example_id": "perception_01244", "split": "perception", "task_type": "fen_board_edit", "fen": "4k3/8/3P2P1/3K4/4P2r/8/8/8 w - -", "prompt": "Board FEN before: 4k3/8/3P2P1/3K4/4P2r/8/8/8\nApply square edits: g6 P->1; g7 1->P\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 4k3/6P1/3P4/3K4/4P2r/8/8/8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "g6g7", "_fen_board_edit_board_fen_before": "4k3/8/3P2P1/3K4/4P2r/8/8/8", "_fen_board_edit_board_fen_after": "4k3/6P1/3P4/3K4/4P2r/8/8/8", "_fen_board_edit_edit_text": "g6 P->1; g7 1->P", "_fen_board_edit_changed_squares": [{"square": "g6", "before": "white pawn", "after": "empty", "before_fen": "P", "after_fen": "1"}, {"square": "g7", "before": "empty", "after": "white pawn", "before_fen": "1", "after_fen": "P"}], "diagnostic": true, "hard_gate": false, "move": "g6g7", "board_fen_before": "4k3/8/3P2P1/3K4/4P2r/8/8/8", "board_fen_after": "4k3/6P1/3P4/3K4/4P2r/8/8/8", "edit_text": "g6 P->1; g7 1->P", "changed_squares": [{"square": "g6", "before": "white pawn", "after": "empty", "before_fen": "P", "after_fen": "1"}, {"square": "g7", "before": "empty", "after": "white pawn", "before_fen": "1", "after_fen": "P"}]}} {"example_id": "perception_01245", "split": "perception", "task_type": "move_square_edits", "fen": "r1b2rk1/2pp1ppp/p1n5/1pb1n3/3NP3/1BP4P/PP3P2/RNB1RK2 b - - 0 14", "prompt": "Starting FEN: r1b2rk1/2pp1ppp/p1n5/1pb1n3/3NP3/1BP4P/PP3P2/RNB1RK2 b - - 0 14\nMove: c6d8\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: c6=black knight; d8=empty.\nSquares: c6 black knight->empty; d8 empty->black knight.\nRanks: rank 6 c n->1; rank 8 d 1->n.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "c6d8", "diagnostic": true, "hard_gate": false, "move": "c6d8"}} {"example_id": "perception_01246", "split": "perception", "task_type": "fen_assembly", "fen": "1r3rk1/p1pn1ppb/4pn1p/7P/q2P2P1/1NP4R/P1P1QPB1/R1B1K3 w Q -", "prompt": "Starting FEN: 1r3rk1/p1pn1ppb/4pn1p/7P/q2P2P1/1NP4R/P1P1QPB1/R1B1K3 w Q - 0 1\nMove: e1f1\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: Q\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white king e1f1.\nLookup: e1=white king; f1=empty.\nSquares: e1 white king->empty; f1 empty->white king.\nRanks: rank 1 e K->1; rank 1 f 1->K.\nResult FEN: 1r3rk1/p1pn1ppb/4pn1p/7P/q2P2P1/1NP4R/P1P1QPB1/R1B2K2 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "e1f1", "diagnostic": true, "hard_gate": false, "move": "e1f1"}} {"example_id": "perception_01247", "split": "perception", "task_type": "fen_row_application", "fen": "2r1r1k1/pp1bppb1/2np1np1/q6p/4PN2/1PN2PP1/PBPQB2P/1K1R3R b - -", "prompt": "Starting FEN: 2r1r1k1/pp1bppb1/2np1np1/q6p/4PN2/1PN2PP1/PBPQB2P/1K1R3R b - - 0 1\nMove: h5h4\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 5 q6p->q7; rank 4 4PN2->4PN1p.\nResult FEN: 2r1r1k1/pp1bppb1/2np1np1/q7/4PN1p/1PN2PP1/PBPQB2P/1K1R3R w - - 0 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "h5h4", "_fen_row_application_rank_rewrites": [{"rank": "5", "before": "q6p", "after": "q7"}, {"rank": "4", "before": "4PN2", "after": "4PN1p"}], "diagnostic": true, "hard_gate": false, "move": "h5h4", "rank_rewrites": [{"rank": "5", "before": "q6p", "after": "q7"}, {"rank": "4", "before": "4PN2", "after": "4PN1p"}]}} {"example_id": "perception_01248", "split": "perception", "task_type": "state_tracking", "fen": "8/8/5k2/4pp2/5Kp1/6Bp/5Pb1/8 w - - 0 55", "prompt": "Starting FEN: 8/8/5k2/4pp2/5Kp1/6Bp/5Pb1/8 w - - 0 55\nAfter the moves f4e3, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 55\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 8/8/5k2/4pp2/6p1/4K1Bp/5Pb1/8 b - - 1 55", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "f4e3", "_state_tracking_result": "8/8/5k2/4pp2/6p1/4K1Bp/5Pb1/8 b - - 1 55"}} {"example_id": "perception_01249", "split": "perception", "task_type": "material_inventory", "fen": "r5k1/2R2pp1/p3p1np/1p1pP3/1P3PP1/P7/4NK1P/8 b - - 4 29", "prompt": "FEN: r5k1/2R2pp1/p3p1np/1p1pP3/1P3PP1/P7/4NK1P/8 b - - 4 29\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=f2; queen=none; rook=c7; bishop=none; knight=e2; pawn=h2,a3,b4,f4,g4,e5.\nBlack inventory: king=g8; queen=none; rook=a8; bishop=none; knight=g6; pawn=b5,d5,a6,e6,h6,f7,g7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01250", "split": "perception", "task_type": "material_piece_counts", "fen": "8/5K2/8/5k1p/6p1/6P1/7P/8 b - -", "prompt": "FEN: 8/5K2/8/5k1p/6p1/6P1/7P/8 b - -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=0; bishop=0; knight=0; pawn=2.\nBlack counts: king=1; queen=0; rook=0; bishop=0; knight=0; pawn=2.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01251", "split": "perception", "task_type": "material_value_totals", "fen": "r1bqrnk1/pp3pp1/2pb1p1p/8/2PP4/3BB3/PPQ1NPPP/2KR3R b - -", "prompt": "FEN: r1bqrnk1/pp3pp1/2pb1p1p/8/2PP4/3BB3/PPQ1NPPP/2KR3R b - -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=6; knight=3; pawn=7; total=35.\nBlack values: king=0; queen=9; rook=10; bishop=6; knight=3; pawn=7; total=35.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01252", "split": "perception", "task_type": "material_balance_trace", "fen": "r2b1rk1/1p1q1ppb/3p3p/pPpP4/P1P1PN2/1Q4P1/6BP/R4RK1 w - - 1 21", "prompt": "FEN: r2b1rk1/1p1q1ppb/3p3p/pPpP4/P1P1PN2/1Q4P1/6BP/R4RK1 w - - 1 21\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=b3; rook=a1,f1; bishop=g2; knight=f4; pawn=h2,g3,a4,c4,e4,b5,d5 | black king=g8; queen=d7; rook=a8,f8; bishop=h7,d8; knight=none; pawn=a5,c5,d6,h6,b7,f7,g7\nCounts: white king=1; queen=1; rook=2; bishop=1; knight=1; pawn=7 | black king=1; queen=1; rook=2; bishop=2; knight=0; pawn=7\nValues: white total=32; black total=32\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01253", "split": "perception", "task_type": "multi_state_tracking", "fen": "1k1r1r2/1p6/p1n1q3/3p2Rp/Q2P1Pb1/P3P3/1P6/1K2R3 b - - 4 34", "prompt": "Starting FEN: 1k1r1r2/1p6/p1n1q3/3p2Rp/Q2P1Pb1/P3P3/1P6/1K2R3 b - - 4 34\nAfter the moves e6d7 e1g1, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 4\nFullmove number: 34\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 1k1r1r2/1p1q4/p1n5/3p2Rp/Q2P1Pb1/P3P3/1P6/1K4R1 b - - 6 35", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "e6d7 e1g1", "_multi_state_tracking_result": "1k1r1r2/1p1q4/p1n5/3p2Rp/Q2P1Pb1/P3P3/1P6/1K4R1 b - - 6 35", "diagnostic": true, "hard_gate": false, "moves": "e6d7 e1g1"}} {"example_id": "perception_01254", "split": "perception", "task_type": "board_print", "fen": "3Rk3/2p2ppp/b1p5/p1b4P/4PN2/2P2P2/P5P1/1rB1K2R b K - 0 19", "prompt": "Position (FEN): 3Rk3/2p2ppp/b1p5/p1b4P/4PN2/2P2P2/P5P1/1rB1K2R b K - 0 19\nShow me the board.", "gold_answer": "8 . . . R k . . .\n7 . . p . . p p p\n6 b . p . . . . .\n5 p . b . . . . P\n4 . . . . P N . .\n3 . . P . . P . .\n2 P . . . . . P .\n1 . r B . K . . R\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01255", "split": "perception", "task_type": "board_to_fen", "fen": "3K4/8/1Q3PB1/2p5/p1P5/8/k7/8 b - - 0 41", "prompt": "Here is the current board:\n8 . . . K . . . .\n7 . . . . . . . .\n6 . Q . . . P B .\n5 . . p . . . . .\n4 p . P . . . . .\n3 . . . . . . . .\n2 k . . . . . . .\n1 . . . . . . . .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 41\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "3K4/8/1Q3PB1/2p5/p1P5/8/k7/8 b - - 0 41", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01256", "split": "perception", "task_type": "piece_id", "fen": "r1bqkbnr/3p1ppp/p1n1p3/1pp5/2B1P3/2P2N2/PP1P1PPP/RNBQ1RK1 w kq - 0 6", "prompt": "FEN: r1bqkbnr/3p1ppp/p1n1p3/1pp5/2B1P3/2P2N2/PP1P1PPP/RNBQ1RK1 w kq - 0 6\nWhat piece is on f2?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "f2"}} {"example_id": "perception_01257", "split": "perception", "task_type": "material_count", "fen": "1R6/P4K2/3k4/8/8/8/8/5r2 w - -", "prompt": "FEN: 1R6/P4K2/3k4/8/8/8/8/5r2 w - -\nWhat is the material count for both sides?", "gold_answer": "White (3 pieces): 1 king, 1 pawn, 1 rook. Black (2 pieces): 1 king, 1 rook. White is up 1 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01258", "split": "perception", "task_type": "square_lookup", "fen": "2kr3r/pbppb1q1/1p2p3/2n1P1p1/6B1/N1P1B2P/PPQ2P2/2KR4 b - - 6 19", "prompt": "FEN: 2kr3r/pbppb1q1/1p2p3/2n1P1p1/6B1/N1P1B2P/PPQ2P2/2KR4 b - - 6 19\nWhat is on e3?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "e3=white bishop", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "e3", "diagnostic": true, "hard_gate": false, "square": "e3"}} {"example_id": "perception_01259", "split": "perception", "task_type": "rank_lookup", "fen": "q4r1k/p5pp/1n2Q3/8/2p1n3/1PP1P1P1/P4P1P/R1B2RK1 w - - 1 19", "prompt": "FEN: q4r1k/p5pp/1n2Q3/8/2p1n3/1PP1P1P1/P4P1P/R1B2RK1 w - - 1 19\nWhat is the compressed FEN row for rank 6?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 6: 1n2Q3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "6", "_rank_lookup_row": "1n2Q3", "diagnostic": true, "hard_gate": false, "rank": "6", "fen_rank_row": "1n2Q3"}} {"example_id": "perception_01260", "split": "perception", "task_type": "square_coordinates", "fen": "r2qkb1r/pp1n1ppp/2n1p3/3pP3/3P4/2NBB3/PP3PPP/R2QK2R b KQkq -", "prompt": "FEN: r2qkb1r/pp1n1ppp/2n1p3/3pP3/3P4/2NBB3/PP3PPP/R2QK2R b KQkq -\nFor square d7, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "d7: file=d; rank=7; fen_row_from_top=2; file_index=4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "d7", "diagnostic": true, "hard_gate": false, "square": "d7"}} {"example_id": "perception_01261", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r1b1kb1r/pp3ppp/2n1pn2/3q4/1p1P4/P4N2/2P1BPPP/RNBQK2R w KQkq -", "prompt": "FEN: r1b1kb1r/pp3ppp/2n1pn2/3q4/1p1P4/P4N2/2P1BPPP/RNBQK2R w KQkq -\nCompressed rank 5 row: 3q4\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 5: a=1; b=1; c=1; d=q; e=1; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "5", "_fen_rank_expansion_row": "3q4", "diagnostic": true, "hard_gate": false, "rank": "5", "fen_rank_row": "3q4"}} {"example_id": "perception_01262", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r5k1/ppp2ppp/8/8/3Br3/8/PP1KB1PP/R7 w - - 0 19", "prompt": "Rank 1 row before: R7\nFile d changes from 1 to R. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 1: R7 -> 3R4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "a1d1", "_fen_rank_cell_edit_square": "d1", "_fen_rank_cell_edit_rank": "1", "_fen_rank_cell_edit_file": "d", "_fen_rank_cell_edit_before_row": "R7", "_fen_rank_cell_edit_after_row": "3R4", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "R", "diagnostic": true, "hard_gate": false, "move": "a1d1", "square": "d1", "rank": "1", "file": "d", "before_row": "R7", "after_row": "3R4", "before_fen": "1", "after_fen": "R"}} {"example_id": "perception_01263", "split": "perception", "task_type": "fen_board_edit", "fen": "4rrk1/2p2ppp/p2p1bq1/3P3n/2P5/3P1PP1/PP4QP/2BRR1K1 w - - 5 21", "prompt": "Board FEN before: 4rrk1/2p2ppp/p2p1bq1/3P3n/2P5/3P1PP1/PP4QP/2BRR1K1\nApply square edits: g2 Q->1; f1 1->Q\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 4rrk1/2p2ppp/p2p1bq1/3P3n/2P5/3P1PP1/PP5P/2BRRQK1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "g2f1", "_fen_board_edit_board_fen_before": "4rrk1/2p2ppp/p2p1bq1/3P3n/2P5/3P1PP1/PP4QP/2BRR1K1", "_fen_board_edit_board_fen_after": "4rrk1/2p2ppp/p2p1bq1/3P3n/2P5/3P1PP1/PP5P/2BRRQK1", "_fen_board_edit_edit_text": "g2 Q->1; f1 1->Q", "_fen_board_edit_changed_squares": [{"square": "g2", "before": "white queen", "after": "empty", "before_fen": "Q", "after_fen": "1"}, {"square": "f1", "before": "empty", "after": "white queen", "before_fen": "1", "after_fen": "Q"}], "diagnostic": true, "hard_gate": false, "move": "g2f1", "board_fen_before": "4rrk1/2p2ppp/p2p1bq1/3P3n/2P5/3P1PP1/PP4QP/2BRR1K1", "board_fen_after": "4rrk1/2p2ppp/p2p1bq1/3P3n/2P5/3P1PP1/PP5P/2BRRQK1", "edit_text": "g2 Q->1; f1 1->Q", "changed_squares": [{"square": "g2", "before": "white queen", "after": "empty", "before_fen": "Q", "after_fen": "1"}, {"square": "f1", "before": "empty", "after": "white queen", "before_fen": "1", "after_fen": "Q"}]}} {"example_id": "perception_01264", "split": "perception", "task_type": "move_square_edits", "fen": "r2q1rk1/pp3ppp/n2b4/1N1Ppb2/2B5/4B3/PP3PPP/R2Q1RK1 b - -", "prompt": "Starting FEN: r2q1rk1/pp3ppp/n2b4/1N1Ppb2/2B5/4B3/PP3PPP/R2Q1RK1 b - -\nMove: d8c7\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: d8=black queen; c7=empty.\nSquares: d8 black queen->empty; c7 empty->black queen.\nRanks: rank 8 d q->1; rank 7 c 1->q.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "d8c7", "diagnostic": true, "hard_gate": false, "move": "d8c7"}} {"example_id": "perception_01265", "split": "perception", "task_type": "fen_assembly", "fen": "2r3q1/2kp1p2/b3p3/1p1pPPNQ/p2P4/P6P/1PP2P2/2KR2R1 w - - 1 29", "prompt": "Starting FEN: 2r3q1/2kp1p2/b3p3/1p1pPPNQ/p2P4/P6P/1PP2P2/2KR2R1 w - - 1 29\nMove: g5f3\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 29\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white knight g5f3.\nLookup: g5=white knight; f3=empty.\nSquares: g5 white knight->empty; f3 empty->white knight.\nRanks: rank 5 g N->1; rank 3 f 1->N.\nResult FEN: 2r3q1/2kp1p2/b3p3/1p1pPP1Q/p2P4/P4N1P/1PP2P2/2KR2R1 b - - 2 29", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "g5f3", "diagnostic": true, "hard_gate": false, "move": "g5f3"}} {"example_id": "perception_01266", "split": "perception", "task_type": "fen_row_application", "fen": "rn1qkb1r/pb1p1ppp/1p2pn2/8/3P4/P3PN1P/1P3PP1/RNBQKB1R b KQkq - 0 7", "prompt": "Starting FEN: rn1qkb1r/pb1p1ppp/1p2pn2/8/3P4/P3PN1P/1P3PP1/RNBQKB1R b KQkq - 0 7\nMove: e6e5\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 7\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 6 1p2pn2->1p3n2; rank 5 8->4p3.\nResult FEN: rn1qkb1r/pb1p1ppp/1p3n2/4p3/3P4/P3PN1P/1P3PP1/RNBQKB1R w KQkq - 0 8", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "e6e5", "_fen_row_application_rank_rewrites": [{"rank": "6", "before": "1p2pn2", "after": "1p3n2"}, {"rank": "5", "before": "8", "after": "4p3"}], "diagnostic": true, "hard_gate": false, "move": "e6e5", "rank_rewrites": [{"rank": "6", "before": "1p2pn2", "after": "1p3n2"}, {"rank": "5", "before": "8", "after": "4p3"}]}} {"example_id": "perception_01267", "split": "perception", "task_type": "state_tracking", "fen": "r3kbnr/p1p3pp/2p1bq2/5p2/3P4/5Q2/PPP2PPP/RNB1R1K1 w kq - 0 12", "prompt": "Starting FEN: r3kbnr/p1p3pp/2p1bq2/5p2/3P4/5Q2/PPP2PPP/RNB1R1K1 w kq - 0 12\nAfter the moves f3e2, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: kq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 12\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r3kbnr/p1p3pp/2p1bq2/5p2/3P4/8/PPP1QPPP/RNB1R1K1 b kq - 1 12", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "f3e2", "_state_tracking_result": "r3kbnr/p1p3pp/2p1bq2/5p2/3P4/8/PPP1QPPP/RNB1R1K1 b kq - 1 12"}} {"example_id": "perception_01268", "split": "perception", "task_type": "material_inventory", "fen": "8/3k4/6P1/3P3K/8/5p2/8/6r1 b - - 0 60", "prompt": "FEN: 8/3k4/6P1/3P3K/8/5p2/8/6r1 b - - 0 60\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=h5; queen=none; rook=none; bishop=none; knight=none; pawn=d5,g6.\nBlack inventory: king=d7; queen=none; rook=g1; bishop=none; knight=none; pawn=f3.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01269", "split": "perception", "task_type": "material_piece_counts", "fen": "1n4k1/p5b1/1p1N2pp/2p1p3/2P4P/PP2B1P1/5PK1/8 b - - 0 28", "prompt": "FEN: 1n4k1/p5b1/1p1N2pp/2p1p3/2P4P/PP2B1P1/5PK1/8 b - - 0 28\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=0; bishop=1; knight=1; pawn=6.\nBlack counts: king=1; queen=0; rook=0; bishop=1; knight=1; pawn=6.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01270", "split": "perception", "task_type": "material_value_totals", "fen": "8/8/8/3P2K1/1pB1k3/1P5P/8/8 b - - 2 57", "prompt": "FEN: 8/8/8/3P2K1/1pB1k3/1P5P/8/8 b - - 2 57\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=0; bishop=3; knight=0; pawn=3; total=6.\nBlack values: king=0; queen=0; rook=0; bishop=0; knight=0; pawn=1; total=1.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01271", "split": "perception", "task_type": "material_balance_trace", "fen": "4k2r/n1p1qppp/4b3/8/4n1P1/4PN1P/P2PK1B1/1R6 w k - 0 23", "prompt": "FEN: 4k2r/n1p1qppp/4b3/8/4n1P1/4PN1P/P2PK1B1/1R6 w k - 0 23\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=e2; queen=none; rook=b1; bishop=g2; knight=f3; pawn=a2,d2,e3,h3,g4 | black king=e8; queen=e7; rook=h8; bishop=e6; knight=e4,a7; pawn=c7,f7,g7,h7\nCounts: white king=1; queen=0; rook=1; bishop=1; knight=1; pawn=5 | black king=1; queen=1; rook=1; bishop=1; knight=2; pawn=4\nValues: white total=16; black total=27\nBalance: Black is up 11 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01272", "split": "perception", "task_type": "multi_state_tracking", "fen": "rn2k1nr/pp1q2p1/2p3p1/4P1p1/2P3P1/8/PP2Q2P/RN1KR3 w kq - 1 20", "prompt": "Starting FEN: rn2k1nr/pp1q2p1/2p3p1/4P1p1/2P3P1/8/PP2Q2P/RN1KR3 w kq - 1 20\nAfter the moves e2d3 b7b6 d1c1, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: kq\nEn passant: none\nHalfmove clock: 1\nFullmove number: 20\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rn2k1nr/p2q2p1/1pp3p1/4P1p1/2P3P1/3Q4/PP5P/RNK1R3 b kq - 1 21", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "e2d3 b7b6 d1c1", "_multi_state_tracking_result": "rn2k1nr/p2q2p1/1pp3p1/4P1p1/2P3P1/3Q4/PP5P/RNK1R3 b kq - 1 21", "diagnostic": true, "hard_gate": false, "moves": "e2d3 b7b6 d1c1"}} {"example_id": "perception_01273", "split": "perception", "task_type": "board_print", "fen": "rnbqk2r/pp1p1ppp/4p3/2p5/2PPn3/P1P5/5PPP/R1BQKBNR w KQkq -", "prompt": "Position (FEN): rnbqk2r/pp1p1ppp/4p3/2p5/2PPn3/P1P5/5PPP/R1BQKBNR w KQkq -\nShow me the board.", "gold_answer": "8 r n b q k . . r\n7 p p . p . p p p\n6 . . . . p . . .\n5 . . p . . . . .\n4 . . P P n . . .\n3 P . P . . . . .\n2 . . . . . P P P\n1 R . B Q K B N R\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01274", "split": "perception", "task_type": "board_to_fen", "fen": "8/3r4/2p3kp/2Bn1Rp1/p5P1/P1P3KP/1P3P2/8 b - - 4 33", "prompt": "Here is the current board:\n8 . . . . . . . .\n7 . . . r . . . .\n6 . . p . . . k p\n5 . . B n . R p .\n4 p . . . . . P .\n3 P . P . . . K P\n2 . P . . . P . .\n1 . . . . . . . .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 4\nFullmove number: 33\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "8/3r4/2p3kp/2Bn1Rp1/p5P1/P1P3KP/1P3P2/8 b - - 4 33", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01275", "split": "perception", "task_type": "piece_id", "fen": "r1bqk2r/p1pp1ppp/1pn2n2/2b1P1Q1/8/2N5/PPP2PPP/R1B1KBNR b KQkq - 0 7", "prompt": "FEN: r1bqk2r/p1pp1ppp/1pn2n2/2b1P1Q1/8/2N5/PPP2PPP/R1B1KBNR b KQkq - 0 7\nWhat piece is on c3?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white knight", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "c3"}} {"example_id": "perception_01276", "split": "perception", "task_type": "material_count", "fen": "8/8/3r4/2k2K1P/8/5PP1/4R3/8 b - - 0 51", "prompt": "FEN: 8/8/3r4/2k2K1P/8/5PP1/4R3/8 b - - 0 51\nWhat is the material count for both sides?", "gold_answer": "White (5 pieces): 1 king, 3 pawns, 1 rook. Black (2 pieces): 1 king, 1 rook. White is up 3 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01277", "split": "perception", "task_type": "square_lookup", "fen": "r3k2r/pp1b2pp/3Ppp2/4Nn2/8/2B5/PP3PPP/R4RK1 w kq - 0 19", "prompt": "FEN: r3k2r/pp1b2pp/3Ppp2/4Nn2/8/2B5/PP3PPP/R4RK1 w kq - 0 19\nWhat is on a2?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "a2=white pawn", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "a2", "diagnostic": true, "hard_gate": false, "square": "a2"}} {"example_id": "perception_01278", "split": "perception", "task_type": "rank_lookup", "fen": "8/pK6/P3kn2/7p/7P/8/4B1P1/8 b - -", "prompt": "FEN: 8/pK6/P3kn2/7p/7P/8/4B1P1/8 b - -\nWhat is the compressed FEN row for rank 6?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 6: P3kn2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "6", "_rank_lookup_row": "P3kn2", "diagnostic": true, "hard_gate": false, "rank": "6", "fen_rank_row": "P3kn2"}} {"example_id": "perception_01279", "split": "perception", "task_type": "square_coordinates", "fen": "4rk2/3q1pb1/1p1p1npp/pPpP4/1nP2B2/1P3N1P/5PP1/1B1QR1K1 b - -", "prompt": "FEN: 4rk2/3q1pb1/1p1p1npp/pPpP4/1nP2B2/1P3N1P/5PP1/1B1QR1K1 b - -\nFor square d7, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "d7: file=d; rank=7; fen_row_from_top=2; file_index=4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "d7", "diagnostic": true, "hard_gate": false, "square": "d7"}} {"example_id": "perception_01280", "split": "perception", "task_type": "fen_rank_expansion", "fen": "rnbqkbnr/5ppp/p3p3/1pp5/3pP3/P7/BPPPNPPP/R1BQK1NR b KQkq -", "prompt": "FEN: rnbqkbnr/5ppp/p3p3/1pp5/3pP3/P7/BPPPNPPP/R1BQK1NR b KQkq -\nCompressed rank 5 row: 1pp5\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 5: a=1; b=p; c=p; d=1; e=1; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "5", "_fen_rank_expansion_row": "1pp5", "diagnostic": true, "hard_gate": false, "rank": "5", "fen_rank_row": "1pp5"}} {"example_id": "perception_01281", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r3r1k1/p1qn1ppp/2pb1p2/1p6/3P4/P1B2Q1P/1PP2PP1/2KR1B1R w - -", "prompt": "Rank 1 row before: 2KR1B1R\nFile d changes from R to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 1: 2KR1B1R -> 2K2B1R", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "d1d2", "_fen_rank_cell_edit_square": "d1", "_fen_rank_cell_edit_rank": "1", "_fen_rank_cell_edit_file": "d", "_fen_rank_cell_edit_before_row": "2KR1B1R", "_fen_rank_cell_edit_after_row": "2K2B1R", "_fen_rank_cell_edit_before_fen": "R", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "d1d2", "square": "d1", "rank": "1", "file": "d", "before_row": "2KR1B1R", "after_row": "2K2B1R", "before_fen": "R", "after_fen": "1"}} {"example_id": "perception_01282", "split": "perception", "task_type": "fen_board_edit", "fen": "3Q1k2/7p/4pp2/1rq4r/5P2/7R/1R4PK/8 b - -", "prompt": "Board FEN before: 3Q1k2/7p/4pp2/1rq4r/5P2/7R/1R4PK/8\nApply square edits: f8 k->1; f7 1->k\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 3Q4/5k1p/4pp2/1rq4r/5P2/7R/1R4PK/8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "f8f7", "_fen_board_edit_board_fen_before": "3Q1k2/7p/4pp2/1rq4r/5P2/7R/1R4PK/8", "_fen_board_edit_board_fen_after": "3Q4/5k1p/4pp2/1rq4r/5P2/7R/1R4PK/8", "_fen_board_edit_edit_text": "f8 k->1; f7 1->k", "_fen_board_edit_changed_squares": [{"square": "f8", "before": "black king", "after": "empty", "before_fen": "k", "after_fen": "1"}, {"square": "f7", "before": "empty", "after": "black king", "before_fen": "1", "after_fen": "k"}], "diagnostic": true, "hard_gate": false, "move": "f8f7", "board_fen_before": "3Q1k2/7p/4pp2/1rq4r/5P2/7R/1R4PK/8", "board_fen_after": "3Q4/5k1p/4pp2/1rq4r/5P2/7R/1R4PK/8", "edit_text": "f8 k->1; f7 1->k", "changed_squares": [{"square": "f8", "before": "black king", "after": "empty", "before_fen": "k", "after_fen": "1"}, {"square": "f7", "before": "empty", "after": "black king", "before_fen": "1", "after_fen": "k"}]}} {"example_id": "perception_01283", "split": "perception", "task_type": "move_square_edits", "fen": "rnbqk2r/pp3pbp/2p2pp1/8/2BP4/2P5/PP2QPPP/R1B1K1NR b KQkq -", "prompt": "Starting FEN: rnbqk2r/pp3pbp/2p2pp1/8/2BP4/2P5/PP2QPPP/R1B1K1NR b KQkq -\nMove: e8f8\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: e8=black king; f8=empty.\nSquares: e8 black king->empty; f8 empty->black king.\nRanks: rank 8 e k->1; rank 8 f 1->k.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "e8f8", "diagnostic": true, "hard_gate": false, "move": "e8f8"}} {"example_id": "perception_01284", "split": "perception", "task_type": "fen_assembly", "fen": "rnb1k1nr/bp1p2pp/5p2/q1PPp3/8/5N2/P2NBPPP/R1BQR1K1 w kq - 0 15", "prompt": "Starting FEN: rnb1k1nr/bp1p2pp/5p2/q1PPp3/8/5N2/P2NBPPP/R1BQR1K1 w kq - 0 15\nMove: f3h4\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: kq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 15\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white knight f3h4.\nLookup: f3=white knight; h4=empty.\nSquares: f3 white knight->empty; h4 empty->white knight.\nRanks: rank 3 f N->1; rank 4 h 1->N.\nResult FEN: rnb1k1nr/bp1p2pp/5p2/q1PPp3/7N/8/P2NBPPP/R1BQR1K1 b kq - 1 15", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "f3h4", "diagnostic": true, "hard_gate": false, "move": "f3h4"}} {"example_id": "perception_01285", "split": "perception", "task_type": "fen_row_application", "fen": "rnbqk2r/pp3pbp/2p1pnp1/8/2pP4/2N2NP1/PP2PPBP/R1BQR1K1 b kq - 1 8", "prompt": "Starting FEN: rnbqk2r/pp3pbp/2p1pnp1/8/2pP4/2N2NP1/PP2PPBP/R1BQR1K1 b kq - 1 8\nMove: d8e7\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: kq\nEn passant: none\nHalfmove clock: 1\nFullmove number: 8\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 8 rnbqk2r->rnb1k2r; rank 7 pp3pbp->pp2qpbp.\nResult FEN: rnb1k2r/pp2qpbp/2p1pnp1/8/2pP4/2N2NP1/PP2PPBP/R1BQR1K1 w kq - 2 9", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "d8e7", "_fen_row_application_rank_rewrites": [{"rank": "8", "before": "rnbqk2r", "after": "rnb1k2r"}, {"rank": "7", "before": "pp3pbp", "after": "pp2qpbp"}], "diagnostic": true, "hard_gate": false, "move": "d8e7", "rank_rewrites": [{"rank": "8", "before": "rnbqk2r", "after": "rnb1k2r"}, {"rank": "7", "before": "pp3pbp", "after": "pp2qpbp"}]}} {"example_id": "perception_01286", "split": "perception", "task_type": "state_tracking", "fen": "r1bqk2r/ppp2ppp/2n1pn2/2b5/2Pp4/3PPNP1/PP3PBP/RNBQ1RK1 b kq -", "prompt": "Starting FEN: r1bqk2r/ppp2ppp/2n1pn2/2b5/2Pp4/3PPNP1/PP3PBP/RNBQ1RK1 b kq - 0 1\nAfter the moves c5a3, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: kq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r1bqk2r/ppp2ppp/2n1pn2/8/2Pp4/b2PPNP1/PP3PBP/RNBQ1RK1 w kq - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "c5a3", "_state_tracking_result": "r1bqk2r/ppp2ppp/2n1pn2/8/2Pp4/b2PPNP1/PP3PBP/RNBQ1RK1 w kq - 1 2"}} {"example_id": "perception_01287", "split": "perception", "task_type": "material_inventory", "fen": "r3k2r/1ppbnppp/p1pq4/8/4P3/2N5/PPP1NPPP/R2Q1RK1 b kq -", "prompt": "FEN: r3k2r/1ppbnppp/p1pq4/8/4P3/2N5/PPP1NPPP/R2Q1RK1 b kq -\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=d1; rook=a1,f1; bishop=none; knight=e2,c3; pawn=a2,b2,c2,f2,g2,h2,e4.\nBlack inventory: king=e8; queen=d6; rook=a8,h8; bishop=d7; knight=e7; pawn=a6,c6,b7,c7,f7,g7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01288", "split": "perception", "task_type": "material_piece_counts", "fen": "3k4/4P3/8/3K1N2/8/8/8/8 b - - 0 70", "prompt": "FEN: 3k4/4P3/8/3K1N2/8/8/8/8 b - - 0 70\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=0; bishop=0; knight=1; pawn=1.\nBlack counts: king=1; queen=0; rook=0; bishop=0; knight=0; pawn=0.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01289", "split": "perception", "task_type": "material_value_totals", "fen": "5rk1/1p3ppp/1p1p4/pP1Pp1q1/P3B3/2r5/2P2PP1/R2QK2R w KQ - 0 18", "prompt": "FEN: 5rk1/1p3ppp/1p1p4/pP1Pp1q1/P3B3/2r5/2P2PP1/R2QK2R w KQ - 0 18\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=3; knight=0; pawn=6; total=28.\nBlack values: king=0; queen=9; rook=10; bishop=0; knight=0; pawn=8; total=27.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01290", "split": "perception", "task_type": "material_balance_trace", "fen": "3r4/1pQ5/6k1/6pp/4P3/P2PKP2/6R1/8 b - - 3 46", "prompt": "FEN: 3r4/1pQ5/6k1/6pp/4P3/P2PKP2/6R1/8 b - - 3 46\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=e3; queen=c7; rook=g2; bishop=none; knight=none; pawn=a3,d3,f3,e4 | black king=g6; queen=none; rook=d8; bishop=none; knight=none; pawn=g5,h5,b7\nCounts: white king=1; queen=1; rook=1; bishop=0; knight=0; pawn=4 | black king=1; queen=0; rook=1; bishop=0; knight=0; pawn=3\nValues: white total=18; black total=8\nBalance: White is up 10 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01291", "split": "perception", "task_type": "multi_state_tracking", "fen": "r2q1rk1/pp1nb1p1/4p2p/2p2p1P/3PN1n1/5N2/PPPBQP2/1K1R3R w - -", "prompt": "Starting FEN: r2q1rk1/pp1nb1p1/4p2p/2p2p1P/3PN1n1/5N2/PPPBQP2/1K1R3R w - - 0 1\nAfter the moves a2a4 g4e5, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r2q1rk1/pp1nb1p1/4p2p/2p1np1P/P2PN3/5N2/1PPBQP2/1K1R3R w - - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "a2a4 g4e5", "_multi_state_tracking_result": "r2q1rk1/pp1nb1p1/4p2p/2p1np1P/P2PN3/5N2/1PPBQP2/1K1R3R w - - 1 2", "diagnostic": true, "hard_gate": false, "moves": "a2a4 g4e5"}} {"example_id": "perception_01292", "split": "perception", "task_type": "board_print", "fen": "8/3Q4/8/8/2B1K3/8/8/2k5 w - -", "prompt": "Position (FEN): 8/3Q4/8/8/2B1K3/8/8/2k5 w - -\nShow me the board.", "gold_answer": "8 . . . . . . . .\n7 . . . Q . . . .\n6 . . . . . . . .\n5 . . . . . . . .\n4 . . B . K . . .\n3 . . . . . . . .\n2 . . . . . . . .\n1 . . k . . . . .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01293", "split": "perception", "task_type": "board_to_fen", "fen": "2kr3r/ppq5/2pb1n1p/3p1p2/P2P1p2/3N3P/1PPN1PP1/R2Q1RK1 b - -", "prompt": "Here is the current board:\n8 . . k r . . . r\n7 p p q . . . . .\n6 . . p b . n . p\n5 . . . p . p . .\n4 P . . P . p . .\n3 . . . N . . . P\n2 . P P N . P P .\n1 R . . Q . R K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "2kr3r/ppq5/2pb1n1p/3p1p2/P2P1p2/3N3P/1PPN1PP1/R2Q1RK1 b - - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01294", "split": "perception", "task_type": "piece_id", "fen": "rnbqk2r/ppbp1ppp/2p2n2/8/5N2/2N1P3/PPP2PPP/R1BQKB1R w KQkq - 4 7", "prompt": "FEN: rnbqk2r/ppbp1ppp/2p2n2/8/5N2/2N1P3/PPP2PPP/R1BQKB1R w KQkq - 4 7\nWhat piece is on b8?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black knight", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "b8"}} {"example_id": "perception_01295", "split": "perception", "task_type": "material_count", "fen": "r1b2rk1/pp1n1pbp/3p4/7Q/P2P1p2/1PP3qP/8/RNB2KNR b - - 0 15", "prompt": "FEN: r1b2rk1/pp1n1pbp/3p4/7Q/P2P1p2/1PP3qP/8/RNB2KNR b - - 0 15\nWhat is the material count for both sides?", "gold_answer": "White (12 pieces): 1 bishop, 1 king, 2 knights, 5 pawns, 1 queen, 2 rooks. Black (13 pieces): 2 bishops, 1 king, 1 knight, 6 pawns, 1 queen, 2 rooks. Black is up 1 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01296", "split": "perception", "task_type": "square_lookup", "fen": "r1b2rk1/ppqnbppp/2p1pn2/3p2B1/2PP4/2NBPN2/PP3PPP/R2Q1RK1 w - -", "prompt": "FEN: r1b2rk1/ppqnbppp/2p1pn2/3p2B1/2PP4/2NBPN2/PP3PPP/R2Q1RK1 w - -\nWhat is on g1?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "g1=white king", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "g1", "diagnostic": true, "hard_gate": false, "square": "g1"}} {"example_id": "perception_01297", "split": "perception", "task_type": "rank_lookup", "fen": "2r1r1k1/7p/2p3p1/P2p4/4B2P/2P2R2/6P1/5R1K b - -", "prompt": "FEN: 2r1r1k1/7p/2p3p1/P2p4/4B2P/2P2R2/6P1/5R1K b - -\nWhat is the compressed FEN row for rank 6?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 6: 2p3p1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "6", "_rank_lookup_row": "2p3p1", "diagnostic": true, "hard_gate": false, "rank": "6", "fen_rank_row": "2p3p1"}} {"example_id": "perception_01298", "split": "perception", "task_type": "square_coordinates", "fen": "r4rk1/pp2ppbp/1nn3p1/5b2/1qP5/1QN2N2/PP1B1PPP/R3KB1R w KQ -", "prompt": "FEN: r4rk1/pp2ppbp/1nn3p1/5b2/1qP5/1QN2N2/PP1B1PPP/R3KB1R w KQ -\nFor square e6, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "e6: file=e; rank=6; fen_row_from_top=3; file_index=5", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "e6", "diagnostic": true, "hard_gate": false, "square": "e6"}} {"example_id": "perception_01299", "split": "perception", "task_type": "fen_rank_expansion", "fen": "rnb1k1nr/pp3pp1/4p2p/3pP2P/q7/P4N2/2PB1PP1/R2QKB1R w KQkq -", "prompt": "FEN: rnb1k1nr/pp3pp1/4p2p/3pP2P/q7/P4N2/2PB1PP1/R2QKB1R w KQkq -\nCompressed rank 6 row: 4p2p\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 6: a=1; b=1; c=1; d=1; e=p; f=1; g=1; h=p", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "6", "_fen_rank_expansion_row": "4p2p", "diagnostic": true, "hard_gate": false, "rank": "6", "fen_rank_row": "4p2p"}} {"example_id": "perception_01300", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r4rk1/pp3ppp/8/2p1nQ2/2PpP3/1P1P4/P5PP/R4RK1 w - - 2 22", "prompt": "Rank 1 row before: R4RK1\nFile a changes from R to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 1: R4RK1 -> 1R3RK1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "a1b1", "_fen_rank_cell_edit_square": "a1", "_fen_rank_cell_edit_rank": "1", "_fen_rank_cell_edit_file": "a", "_fen_rank_cell_edit_before_row": "R4RK1", "_fen_rank_cell_edit_after_row": "1R3RK1", "_fen_rank_cell_edit_before_fen": "R", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "a1b1", "square": "a1", "rank": "1", "file": "a", "before_row": "R4RK1", "after_row": "1R3RK1", "before_fen": "R", "after_fen": "1"}} {"example_id": "perception_01301", "split": "perception", "task_type": "fen_board_edit", "fen": "2k4r/3R4/3K4/8/8/1R5P/1P6/8 w - - 11 62", "prompt": "Board FEN before: 2k4r/3R4/3K4/8/8/1R5P/1P6/8\nApply square edits: d6 K->1; e6 1->K\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 2k4r/3R4/4K3/8/8/1R5P/1P6/8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "d6e6", "_fen_board_edit_board_fen_before": "2k4r/3R4/3K4/8/8/1R5P/1P6/8", "_fen_board_edit_board_fen_after": "2k4r/3R4/4K3/8/8/1R5P/1P6/8", "_fen_board_edit_edit_text": "d6 K->1; e6 1->K", "_fen_board_edit_changed_squares": [{"square": "d6", "before": "white king", "after": "empty", "before_fen": "K", "after_fen": "1"}, {"square": "e6", "before": "empty", "after": "white king", "before_fen": "1", "after_fen": "K"}], "diagnostic": true, "hard_gate": false, "move": "d6e6", "board_fen_before": "2k4r/3R4/3K4/8/8/1R5P/1P6/8", "board_fen_after": "2k4r/3R4/4K3/8/8/1R5P/1P6/8", "edit_text": "d6 K->1; e6 1->K", "changed_squares": [{"square": "d6", "before": "white king", "after": "empty", "before_fen": "K", "after_fen": "1"}, {"square": "e6", "before": "empty", "after": "white king", "before_fen": "1", "after_fen": "K"}]}} {"example_id": "perception_01302", "split": "perception", "task_type": "move_square_edits", "fen": "r2qr1k1/pb1n1pbp/1p3np1/1Npp2B1/3P2N1/4PQ2/PP3PPP/1BR1R1K1 w - -", "prompt": "Starting FEN: r2qr1k1/pb1n1pbp/1p3np1/1Npp2B1/3P2N1/4PQ2/PP3PPP/1BR1R1K1 w - -\nMove: h2h3\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: h2=white pawn; h3=empty.\nSquares: h2 white pawn->empty; h3 empty->white pawn.\nRanks: rank 2 h P->1; rank 3 h 1->P.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "h2h3", "diagnostic": true, "hard_gate": false, "move": "h2h3"}} {"example_id": "perception_01303", "split": "perception", "task_type": "fen_assembly", "fen": "r1bqkb1r/pppnpp1p/3p1np1/8/3P1P2/4PN2/PPP3PP/RNBQKB1R w KQkq - 0 5", "prompt": "Starting FEN: r1bqkb1r/pppnpp1p/3p1np1/8/3P1P2/4PN2/PPP3PP/RNBQKB1R w KQkq - 0 5\nMove: b1a3\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 5\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white knight b1a3.\nLookup: b1=white knight; a3=empty.\nSquares: b1 white knight->empty; a3 empty->white knight.\nRanks: rank 1 b N->1; rank 3 a 1->N.\nResult FEN: r1bqkb1r/pppnpp1p/3p1np1/8/3P1P2/N3PN2/PPP3PP/R1BQKB1R b KQkq - 1 5", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "b1a3", "diagnostic": true, "hard_gate": false, "move": "b1a3"}} {"example_id": "perception_01304", "split": "perception", "task_type": "fen_row_application", "fen": "8/r2k1ppp/5n2/1R1p4/p2P4/B1R1PP1P/4r1PK/8 b - - 2 29", "prompt": "Starting FEN: 8/r2k1ppp/5n2/1R1p4/p2P4/B1R1PP1P/4r1PK/8 b - - 2 29\nMove: f6g4\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 2\nFullmove number: 29\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 6 5n2->8; rank 4 p2P4->p2P2n1.\nResult FEN: 8/r2k1ppp/8/1R1p4/p2P2n1/B1R1PP1P/4r1PK/8 w - - 3 30", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "f6g4", "_fen_row_application_rank_rewrites": [{"rank": "6", "before": "5n2", "after": "8"}, {"rank": "4", "before": "p2P4", "after": "p2P2n1"}], "diagnostic": true, "hard_gate": false, "move": "f6g4", "rank_rewrites": [{"rank": "6", "before": "5n2", "after": "8"}, {"rank": "4", "before": "p2P4", "after": "p2P2n1"}]}} {"example_id": "perception_01305", "split": "perception", "task_type": "state_tracking", "fen": "r1b1k1nr/pp1p1ppp/2n1p3/q1b5/4P3/2P1QN2/PP3PPP/RNB1KB1R w KQkq -", "prompt": "Starting FEN: r1b1k1nr/pp1p1ppp/2n1p3/q1b5/4P3/2P1QN2/PP3PPP/RNB1KB1R w KQkq - 0 1\nAfter the moves g2g4, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r1b1k1nr/pp1p1ppp/2n1p3/q1b5/4P1P1/2P1QN2/PP3P1P/RNB1KB1R b KQkq - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "g2g4", "_state_tracking_result": "r1b1k1nr/pp1p1ppp/2n1p3/q1b5/4P1P1/2P1QN2/PP3P1P/RNB1KB1R b KQkq - 0 1"}} {"example_id": "perception_01306", "split": "perception", "task_type": "material_inventory", "fen": "rnb1k2r/pp1p1ppp/2qb1n2/8/3P4/P1B5/2PN1PPP/R2QKBNR w KQkq - 3 10", "prompt": "FEN: rnb1k2r/pp1p1ppp/2qb1n2/8/3P4/P1B5/2PN1PPP/R2QKBNR w KQkq - 3 10\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=e1; queen=d1; rook=a1,h1; bishop=f1,c3; knight=g1,d2; pawn=c2,f2,g2,h2,a3,d4.\nBlack inventory: king=e8; queen=c6; rook=a8,h8; bishop=d6,c8; knight=f6,b8; pawn=a7,b7,d7,f7,g7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01307", "split": "perception", "task_type": "material_piece_counts", "fen": "r2qkr2/pppn1pQp/4p3/7b/4N3/3PPN1P/P1P1B1P1/5K1R w q - 1 15", "prompt": "FEN: r2qkr2/pppn1pQp/4p3/7b/4N3/3PPN1P/P1P1B1P1/5K1R w q - 1 15\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=1; bishop=1; knight=2; pawn=6.\nBlack counts: king=1; queen=1; rook=2; bishop=1; knight=1; pawn=6.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01308", "split": "perception", "task_type": "material_value_totals", "fen": "2kr3r/1p3ppp/p1npb3/2p5/8/3P1N2/PPP2PPP/R1B1RK2 w - -", "prompt": "FEN: 2kr3r/1p3ppp/p1npb3/2p5/8/3P1N2/PPP2PPP/R1B1RK2 w - -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=10; bishop=3; knight=3; pawn=7; total=23.\nBlack values: king=0; queen=0; rook=10; bishop=3; knight=3; pawn=7; total=23.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01309", "split": "perception", "task_type": "material_balance_trace", "fen": "4r3/3kbRR1/pp1p4/2p5/P1P1P2p/3P3K/8/8 b - - 5 39", "prompt": "FEN: 4r3/3kbRR1/pp1p4/2p5/P1P1P2p/3P3K/8/8 b - - 5 39\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=h3; queen=none; rook=f7,g7; bishop=none; knight=none; pawn=d3,a4,c4,e4 | black king=d7; queen=none; rook=e8; bishop=e7; knight=none; pawn=h4,c5,a6,b6,d6\nCounts: white king=1; queen=0; rook=2; bishop=0; knight=0; pawn=4 | black king=1; queen=0; rook=1; bishop=1; knight=0; pawn=5\nValues: white total=14; black total=13\nBalance: White is up 1 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01310", "split": "perception", "task_type": "multi_state_tracking", "fen": "2r2k1r/p4ppp/q1pb1n2/4R3/P2p4/1P4P1/2QP1PBP/R1B3K1 w - - 1 18", "prompt": "Starting FEN: 2r2k1r/p4ppp/q1pb1n2/4R3/P2p4/1P4P1/2QP1PBP/R1B3K1 w - - 1 18\nAfter the moves e5a5 a6d3, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 18\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 2r2k1r/p4ppp/2pb1n2/R7/P2p4/1P1q2P1/2QP1PBP/R1B3K1 w - - 3 19", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "e5a5 a6d3", "_multi_state_tracking_result": "2r2k1r/p4ppp/2pb1n2/R7/P2p4/1P1q2P1/2QP1PBP/R1B3K1 w - - 3 19", "diagnostic": true, "hard_gate": false, "moves": "e5a5 a6d3"}} {"example_id": "perception_01311", "split": "perception", "task_type": "board_print", "fen": "1k3br1/1p3p2/2p2q2/p1n2N2/P1n3Pp/2N4B/1P1QPP2/3R3K w - -", "prompt": "Position (FEN): 1k3br1/1p3p2/2p2q2/p1n2N2/P1n3Pp/2N4B/1P1QPP2/3R3K w - -\nShow me the board.", "gold_answer": "8 . k . . . b r .\n7 . p . . . p . .\n6 . . p . . q . .\n5 p . n . . N . .\n4 P . n . . . P p\n3 . . N . . . . B\n2 . P . Q P P . .\n1 . . . R . . . K\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01312", "split": "perception", "task_type": "board_to_fen", "fen": "rn1qkb1r/p4ppp/1pp1pn2/3p1P2/3P4/3BPQ2/PPP3PP/RNB2RK1 b kq - 0 8", "prompt": "Here is the current board:\n8 r n . q k b . r\n7 p . . . . p p p\n6 . p p . p n . .\n5 . . . p . P . .\n4 . . . P . . . .\n3 . . . B P Q . .\n2 P P P . . . P P\n1 R N B . . R K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: kq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 8\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "rn1qkb1r/p4ppp/1pp1pn2/3p1P2/3P4/3BPQ2/PPP3PP/RNB2RK1 b kq - 0 8", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01313", "split": "perception", "task_type": "piece_id", "fen": "rn3k2/2p2p1r/1p1pB3/p2Pp3/Q1P3PR/1KP5/P2q4/5R2 b - - 0 25", "prompt": "FEN: rn3k2/2p2p1r/1p1pB3/p2Pp3/Q1P3PR/1KP5/P2q4/5R2 b - - 0 25\nWhat piece is on g4?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "g4"}} {"example_id": "perception_01314", "split": "perception", "task_type": "material_count", "fen": "r1r5/pp1bkp1R/8/3p4/1P4Q1/P3P3/1b2KP2/8 b - - 1 27", "prompt": "FEN: r1r5/pp1bkp1R/8/3p4/1P4Q1/P3P3/1b2KP2/8 b - - 1 27\nWhat is the material count for both sides?", "gold_answer": "White (7 pieces): 1 king, 4 pawns, 1 queen, 1 rook. Black (9 pieces): 2 bishops, 1 king, 4 pawns, 2 rooks. Black is up 2 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01315", "split": "perception", "task_type": "square_lookup", "fen": "r1bq1rk1/ppp2pb1/3p1npn/3Np1N1/2B1P3/3P4/PPP2PP1/R1BQK2R b KQ - 1 10", "prompt": "FEN: r1bq1rk1/ppp2pb1/3p1npn/3Np1N1/2B1P3/3P4/PPP2PP1/R1BQK2R b KQ - 1 10\nWhat is on f5?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "f5=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "f5", "diagnostic": true, "hard_gate": false, "square": "f5"}} {"example_id": "perception_01316", "split": "perception", "task_type": "rank_lookup", "fen": "r4rk1/pp1qbpp1/2np1n1p/4p1B1/4P3/2N2N2/PPPQ1PPP/R3R1K1 w - -", "prompt": "FEN: r4rk1/pp1qbpp1/2np1n1p/4p1B1/4P3/2N2N2/PPPQ1PPP/R3R1K1 w - -\nWhat is the compressed FEN row for rank 6?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 6: 2np1n1p", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "6", "_rank_lookup_row": "2np1n1p", "diagnostic": true, "hard_gate": false, "rank": "6", "fen_rank_row": "2np1n1p"}} {"example_id": "perception_01317", "split": "perception", "task_type": "square_coordinates", "fen": "r2qk1nr/pp3ppp/2n1p3/3p4/1bPP2b1/1QN2N2/PP2BPPP/R1B1K2R b KQkq - 5 8", "prompt": "FEN: r2qk1nr/pp3ppp/2n1p3/3p4/1bPP2b1/1QN2N2/PP2BPPP/R1B1K2R b KQkq - 5 8\nFor square g2, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "g2: file=g; rank=2; fen_row_from_top=7; file_index=7", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "g2", "diagnostic": true, "hard_gate": false, "square": "g2"}} {"example_id": "perception_01318", "split": "perception", "task_type": "fen_rank_expansion", "fen": "3r1rk1/pppq1pp1/1bnpbn1p/4p3/4P3/1BNPBN1P/PPPQ1PP1/R3R1K1 w - -", "prompt": "FEN: 3r1rk1/pppq1pp1/1bnpbn1p/4p3/4P3/1BNPBN1P/PPPQ1PP1/R3R1K1 w - -\nCompressed rank 4 row: 4P3\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 4: a=1; b=1; c=1; d=1; e=P; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "4", "_fen_rank_expansion_row": "4P3", "diagnostic": true, "hard_gate": false, "rank": "4", "fen_rank_row": "4P3"}} {"example_id": "perception_01319", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "8/p5pp/3k1p2/2p1p3/8/P2PKPP1/1r5n/3R4 w - - 1 34", "prompt": "Rank 4 row before: 8\nFile a changes from 1 to P. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 4: 8 -> P7", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "a3a4", "_fen_rank_cell_edit_square": "a4", "_fen_rank_cell_edit_rank": "4", "_fen_rank_cell_edit_file": "a", "_fen_rank_cell_edit_before_row": "8", "_fen_rank_cell_edit_after_row": "P7", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "P", "diagnostic": true, "hard_gate": false, "move": "a3a4", "square": "a4", "rank": "4", "file": "a", "before_row": "8", "after_row": "P7", "before_fen": "1", "after_fen": "P"}} {"example_id": "perception_01320", "split": "perception", "task_type": "fen_board_edit", "fen": "r2qk2r/pp3pp1/2n1pn1p/2b4b/4N3/2PB1N1P/PP3PP1/R1BQ1RK1 b kq - 0 11", "prompt": "Board FEN before: r2qk2r/pp3pp1/2n1pn1p/2b4b/4N3/2PB1N1P/PP3PP1/R1BQ1RK1\nApply square edits: c5 b->1; e7 1->b\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: r2qk2r/pp2bpp1/2n1pn1p/7b/4N3/2PB1N1P/PP3PP1/R1BQ1RK1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "c5e7", "_fen_board_edit_board_fen_before": "r2qk2r/pp3pp1/2n1pn1p/2b4b/4N3/2PB1N1P/PP3PP1/R1BQ1RK1", "_fen_board_edit_board_fen_after": "r2qk2r/pp2bpp1/2n1pn1p/7b/4N3/2PB1N1P/PP3PP1/R1BQ1RK1", "_fen_board_edit_edit_text": "c5 b->1; e7 1->b", "_fen_board_edit_changed_squares": [{"square": "c5", "before": "black bishop", "after": "empty", "before_fen": "b", "after_fen": "1"}, {"square": "e7", "before": "empty", "after": "black bishop", "before_fen": "1", "after_fen": "b"}], "diagnostic": true, "hard_gate": false, "move": "c5e7", "board_fen_before": "r2qk2r/pp3pp1/2n1pn1p/2b4b/4N3/2PB1N1P/PP3PP1/R1BQ1RK1", "board_fen_after": "r2qk2r/pp2bpp1/2n1pn1p/7b/4N3/2PB1N1P/PP3PP1/R1BQ1RK1", "edit_text": "c5 b->1; e7 1->b", "changed_squares": [{"square": "c5", "before": "black bishop", "after": "empty", "before_fen": "b", "after_fen": "1"}, {"square": "e7", "before": "empty", "after": "black bishop", "before_fen": "1", "after_fen": "b"}]}} {"example_id": "perception_01321", "split": "perception", "task_type": "move_square_edits", "fen": "6k1/5ppp/p1p5/2Bp4/2n5/P4PKP/1r4P1/2R5 b - - 2 30", "prompt": "Starting FEN: 6k1/5ppp/p1p5/2Bp4/2n5/P4PKP/1r4P1/2R5 b - - 2 30\nMove: a6a5\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: a6=black pawn; a5=empty.\nSquares: a6 black pawn->empty; a5 empty->black pawn.\nRanks: rank 6 a p->1; rank 5 a 1->p.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "a6a5", "diagnostic": true, "hard_gate": false, "move": "a6a5"}} {"example_id": "perception_01322", "split": "perception", "task_type": "fen_assembly", "fen": "6k1/6p1/4R2p/3p4/3N1q2/3p3K/1r4P1/8 b - - 4 31", "prompt": "Starting FEN: 6k1/6p1/4R2p/3p4/3N1q2/3p3K/1r4P1/8 b - - 4 31\nMove: h6h5\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 4\nFullmove number: 31\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black pawn h6h5.\nLookup: h6=black pawn; h5=empty.\nSquares: h6 black pawn->empty; h5 empty->black pawn.\nRanks: rank 6 h p->1; rank 5 h 1->p.\nResult FEN: 6k1/6p1/4R3/3p3p/3N1q2/3p3K/1r4P1/8 w - - 0 32", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "h6h5", "diagnostic": true, "hard_gate": false, "move": "h6h5"}} {"example_id": "perception_01323", "split": "perception", "task_type": "fen_row_application", "fen": "r3k2r/1p2q1bp/n1Pp1pp1/p3p3/Q1P3PP/P4N2/1P1B1P2/1K1R1B1R b kq - 0 20", "prompt": "Starting FEN: r3k2r/1p2q1bp/n1Pp1pp1/p3p3/Q1P3PP/P4N2/1P1B1P2/1K1R1B1R b kq - 0 20\nMove: h8f8\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: kq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 20\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 8 r3k2r->r3kr2.\nResult FEN: r3kr2/1p2q1bp/n1Pp1pp1/p3p3/Q1P3PP/P4N2/1P1B1P2/1K1R1B1R w q - 1 21", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "h8f8", "_fen_row_application_rank_rewrites": [{"rank": "8", "before": "r3k2r", "after": "r3kr2"}], "diagnostic": true, "hard_gate": false, "move": "h8f8", "rank_rewrites": [{"rank": "8", "before": "r3k2r", "after": "r3kr2"}]}} {"example_id": "perception_01324", "split": "perception", "task_type": "state_tracking", "fen": "8/5k2/8/8/1Q2K1B1/8/8/8 w - -", "prompt": "Starting FEN: 8/5k2/8/8/1Q2K1B1/8/8/8 w - - 0 1\nAfter the moves g4d7, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 8/3B1k2/8/8/1Q2K3/8/8/8 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "g4d7", "_state_tracking_result": "8/3B1k2/8/8/1Q2K3/8/8/8 b - - 1 1"}} {"example_id": "perception_01325", "split": "perception", "task_type": "material_inventory", "fen": "3r3k/ppp5/6p1/1n1PR3/8/nP1K4/P4PPP/2R5 b - - 7 26", "prompt": "FEN: 3r3k/ppp5/6p1/1n1PR3/8/nP1K4/P4PPP/2R5 b - - 7 26\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=d3; queen=none; rook=c1,e5; bishop=none; knight=none; pawn=a2,f2,g2,h2,b3,d5.\nBlack inventory: king=h8; queen=none; rook=d8; bishop=none; knight=a3,b5; pawn=g6,a7,b7,c7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01326", "split": "perception", "task_type": "material_piece_counts", "fen": "r3kb1r/ppp1pppp/2n2n2/8/3P4/2N2P2/PPP2P1P/R1BQK2R b KQkq - 0 9", "prompt": "FEN: r3kb1r/ppp1pppp/2n2n2/8/3P4/2N2P2/PPP2P1P/R1BQK2R b KQkq - 0 9\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=1; knight=1; pawn=7.\nBlack counts: king=1; queen=0; rook=2; bishop=1; knight=2; pawn=7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01327", "split": "perception", "task_type": "material_value_totals", "fen": "r5k1/pp3ppp/1N2q2n/4r3/5Q2/2P5/P4PPP/3R1bK1 w - - 0 23", "prompt": "FEN: r5k1/pp3ppp/1N2q2n/4r3/5Q2/2P5/P4PPP/3R1bK1 w - - 0 23\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=5; bishop=0; knight=3; pawn=5; total=22.\nBlack values: king=0; queen=9; rook=10; bishop=3; knight=3; pawn=5; total=30.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01328", "split": "perception", "task_type": "material_balance_trace", "fen": "r2qr3/pp2b2p/2n2kpB/2P5/3p4/1Q4P1/PPP1P1BP/5RK1 b - -", "prompt": "FEN: r2qr3/pp2b2p/2n2kpB/2P5/3p4/1Q4P1/PPP1P1BP/5RK1 b - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=b3; rook=f1; bishop=g2,h6; knight=none; pawn=a2,b2,c2,e2,h2,g3,c5 | black king=f6; queen=d8; rook=a8,e8; bishop=e7; knight=c6; pawn=d4,g6,a7,b7,h7\nCounts: white king=1; queen=1; rook=1; bishop=2; knight=0; pawn=7 | black king=1; queen=1; rook=2; bishop=1; knight=1; pawn=5\nValues: white total=27; black total=30\nBalance: Black is up 3 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01329", "split": "perception", "task_type": "multi_state_tracking", "fen": "3R4/8/4K3/2k5/8/8/8/8 w - - 26 81", "prompt": "Starting FEN: 3R4/8/4K3/2k5/8/8/8/8 w - - 26 81\nAfter the moves d8d6 c5b4, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 26\nFullmove number: 81\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 8/8/3RK3/8/1k6/8/8/8 w - - 28 82", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "d8d6 c5b4", "_multi_state_tracking_result": "8/8/3RK3/8/1k6/8/8/8 w - - 28 82", "diagnostic": true, "hard_gate": false, "moves": "d8d6 c5b4"}} {"example_id": "perception_01330", "split": "perception", "task_type": "board_print", "fen": "r2q1rk1/pp1bbppp/4p3/nPPpP3/8/2QB1N2/P1P2PPP/RN2K2R w KQ -", "prompt": "Position (FEN): r2q1rk1/pp1bbppp/4p3/nPPpP3/8/2QB1N2/P1P2PPP/RN2K2R w KQ -\nShow me the board.", "gold_answer": "8 r . . q . r k .\n7 p p . b b p p p\n6 . . . . p . . .\n5 n P P p P . . .\n4 . . . . . . . .\n3 . . Q B . N . .\n2 P . P . . P P P\n1 R N . . K . . R\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01331", "split": "perception", "task_type": "board_to_fen", "fen": "r1bq1rk1/pppnppbp/3p1np1/6N1/2BP4/1QP1P3/PP3PPP/RNB1K2R b KQ -", "prompt": "Here is the current board:\n8 r . b q . r k .\n7 p p p n p p b p\n6 . . . p . n p .\n5 . . . . . . N .\n4 . . B P . . . .\n3 . Q P . P . . .\n2 P P . . . P P P\n1 R N B . K . . R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r1bq1rk1/pppnppbp/3p1np1/6N1/2BP4/1QP1P3/PP3PPP/RNB1K2R b KQ - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01332", "split": "perception", "task_type": "piece_id", "fen": "8/pp2q1kp/2p2pp1/3rp3/8/5Q1P/PP4P1/2R4K b - - 3 37", "prompt": "FEN: 8/pp2q1kp/2p2pp1/3rp3/8/5Q1P/PP4P1/2R4K b - - 3 37\nWhat piece is on c6?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "c6"}} {"example_id": "perception_01333", "split": "perception", "task_type": "material_count", "fen": "8/7p/5kbP/1p1p1p2/1P1P1P1K/8/8/8 w - -", "prompt": "FEN: 8/7p/5kbP/1p1p1p2/1P1P1P1K/8/8/8 w - -\nWhat is the material count for both sides?", "gold_answer": "White (5 pieces): 1 king, 4 pawns. Black (6 pieces): 1 bishop, 1 king, 4 pawns. Black is up 3 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01334", "split": "perception", "task_type": "square_lookup", "fen": "5r2/8/pP6/P6R/2k1p2P/4K3/6P1/8 b - - 0 48", "prompt": "FEN: 5r2/8/pP6/P6R/2k1p2P/4K3/6P1/8 b - - 0 48\nWhat is on a4?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "a4=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "a4", "diagnostic": true, "hard_gate": false, "square": "a4"}} {"example_id": "perception_01335", "split": "perception", "task_type": "rank_lookup", "fen": "4r2k/p1p3pp/4r3/7b/4N3/2P1KPP1/PP6/4R3 b - - 0 26", "prompt": "FEN: 4r2k/p1p3pp/4r3/7b/4N3/2P1KPP1/PP6/4R3 b - - 0 26\nWhat is the compressed FEN row for rank 1?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 1: 4R3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "1", "_rank_lookup_row": "4R3", "diagnostic": true, "hard_gate": false, "rank": "1", "fen_rank_row": "4R3"}} {"example_id": "perception_01336", "split": "perception", "task_type": "square_coordinates", "fen": "r2r2k1/5pp1/pn5p/1p6/3N4/2P5/1P1R1PPP/4RK2 b - - 8 26", "prompt": "FEN: r2r2k1/5pp1/pn5p/1p6/3N4/2P5/1P1R1PPP/4RK2 b - - 8 26\nFor square f2, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "f2: file=f; rank=2; fen_row_from_top=7; file_index=6", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "f2", "diagnostic": true, "hard_gate": false, "square": "f2"}} {"example_id": "perception_01337", "split": "perception", "task_type": "fen_rank_expansion", "fen": "1rbqk2r/5ppp/p1np4/1p1Np1b1/4P3/2P5/PPN2PPP/R2QKB1R w KQk -", "prompt": "FEN: 1rbqk2r/5ppp/p1np4/1p1Np1b1/4P3/2P5/PPN2PPP/R2QKB1R w KQk -\nCompressed rank 7 row: 5ppp\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 7: a=1; b=1; c=1; d=1; e=1; f=p; g=p; h=p", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "7", "_fen_rank_expansion_row": "5ppp", "diagnostic": true, "hard_gate": false, "rank": "7", "fen_rank_row": "5ppp"}} {"example_id": "perception_01338", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r7/p2b2pk/3bp2p/2pp4/4P2q/N1P1B3/PP4PP/R4QK1 w - - 0 20", "prompt": "Rank 3 row before: N1P1B3\nFile e changes from B to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 3: N1P1B3 -> N1P5", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "e3d4", "_fen_rank_cell_edit_square": "e3", "_fen_rank_cell_edit_rank": "3", "_fen_rank_cell_edit_file": "e", "_fen_rank_cell_edit_before_row": "N1P1B3", "_fen_rank_cell_edit_after_row": "N1P5", "_fen_rank_cell_edit_before_fen": "B", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "e3d4", "square": "e3", "rank": "3", "file": "e", "before_row": "N1P1B3", "after_row": "N1P5", "before_fen": "B", "after_fen": "1"}} {"example_id": "perception_01339", "split": "perception", "task_type": "fen_board_edit", "fen": "6k1/ppp3pp/3p4/8/P1P1N3/1P6/2P2KPP/8 b - - 0 23", "prompt": "Board FEN before: 6k1/ppp3pp/3p4/8/P1P1N3/1P6/2P2KPP/8\nApply square edits: c7 p->1; c5 1->p\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 6k1/pp4pp/3p4/2p5/P1P1N3/1P6/2P2KPP/8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "c7c5", "_fen_board_edit_board_fen_before": "6k1/ppp3pp/3p4/8/P1P1N3/1P6/2P2KPP/8", "_fen_board_edit_board_fen_after": "6k1/pp4pp/3p4/2p5/P1P1N3/1P6/2P2KPP/8", "_fen_board_edit_edit_text": "c7 p->1; c5 1->p", "_fen_board_edit_changed_squares": [{"square": "c7", "before": "black pawn", "after": "empty", "before_fen": "p", "after_fen": "1"}, {"square": "c5", "before": "empty", "after": "black pawn", "before_fen": "1", "after_fen": "p"}], "diagnostic": true, "hard_gate": false, "move": "c7c5", "board_fen_before": "6k1/ppp3pp/3p4/8/P1P1N3/1P6/2P2KPP/8", "board_fen_after": "6k1/pp4pp/3p4/2p5/P1P1N3/1P6/2P2KPP/8", "edit_text": "c7 p->1; c5 1->p", "changed_squares": [{"square": "c7", "before": "black pawn", "after": "empty", "before_fen": "p", "after_fen": "1"}, {"square": "c5", "before": "empty", "after": "black pawn", "before_fen": "1", "after_fen": "p"}]}} {"example_id": "perception_01340", "split": "perception", "task_type": "move_square_edits", "fen": "7k/1R4p1/r3p2p/4P2P/8/8/4K1P1/8 b - -", "prompt": "Starting FEN: 7k/1R4p1/r3p2p/4P2P/8/8/4K1P1/8 b - -\nMove: a6a2\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: a6=black rook; a2=empty.\nSquares: a6 black rook->empty; a2 empty->black rook.\nRanks: rank 6 a r->1; rank 2 a 1->r.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "a6a2", "diagnostic": true, "hard_gate": false, "move": "a6a2"}} {"example_id": "perception_01341", "split": "perception", "task_type": "fen_assembly", "fen": "2rq1kr1/1Q3p2/1p2p3/1B1p3p/P2n1Pp1/8/n4RPP/1N4K1 w - - 0 30", "prompt": "Starting FEN: 2rq1kr1/1Q3p2/1p2p3/1B1p3p/P2n1Pp1/8/n4RPP/1N4K1 w - - 0 30\nMove: b7b8\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 30\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white queen b7b8.\nLookup: b7=white queen; b8=empty.\nSquares: b7 white queen->empty; b8 empty->white queen.\nRanks: rank 7 b Q->1; rank 8 b 1->Q.\nResult FEN: 1Qrq1kr1/5p2/1p2p3/1B1p3p/P2n1Pp1/8/n4RPP/1N4K1 b - - 1 30", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "b7b8", "diagnostic": true, "hard_gate": false, "move": "b7b8"}} {"example_id": "perception_01342", "split": "perception", "task_type": "fen_row_application", "fen": "Qn2kr2/p5pp/2pb4/8/2BP2P1/7K/PPP2q1P/R6R b - -", "prompt": "Starting FEN: Qn2kr2/p5pp/2pb4/8/2BP2P1/7K/PPP2q1P/R6R b - - 0 1\nMove: f8f4\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 8 Qn2kr2->Qn2k3; rank 4 2BP2P1->2BP1rP1.\nResult FEN: Qn2k3/p5pp/2pb4/8/2BP1rP1/7K/PPP2q1P/R6R w - - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "f8f4", "_fen_row_application_rank_rewrites": [{"rank": "8", "before": "Qn2kr2", "after": "Qn2k3"}, {"rank": "4", "before": "2BP2P1", "after": "2BP1rP1"}], "diagnostic": true, "hard_gate": false, "move": "f8f4", "rank_rewrites": [{"rank": "8", "before": "Qn2kr2", "after": "Qn2k3"}, {"rank": "4", "before": "2BP2P1", "after": "2BP1rP1"}]}} {"example_id": "perception_01343", "split": "perception", "task_type": "state_tracking", "fen": "rn3rk1/1bp1qppp/p3p3/8/2BPn3/2N1PN2/PP3PPP/R2Q1RK1 w - - 0 12", "prompt": "Starting FEN: rn3rk1/1bp1qppp/p3p3/8/2BPn3/2N1PN2/PP3PPP/R2Q1RK1 w - - 0 12\nAfter the moves d1d2, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 12\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rn3rk1/1bp1qppp/p3p3/8/2BPn3/2N1PN2/PP1Q1PPP/R4RK1 b - - 1 12", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "d1d2", "_state_tracking_result": "rn3rk1/1bp1qppp/p3p3/8/2BPn3/2N1PN2/PP1Q1PPP/R4RK1 b - - 1 12"}} {"example_id": "perception_01344", "split": "perception", "task_type": "material_inventory", "fen": "rn1qkbnr/pbpppppp/1p6/6B1/2PP4/8/PP2PPPP/RN1QKBNR b KQkq - 2 3", "prompt": "FEN: rn1qkbnr/pbpppppp/1p6/6B1/2PP4/8/PP2PPPP/RN1QKBNR b KQkq - 2 3\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=e1; queen=d1; rook=a1,h1; bishop=f1,g5; knight=b1,g1; pawn=a2,b2,e2,f2,g2,h2,c4,d4.\nBlack inventory: king=e8; queen=d8; rook=a8,h8; bishop=b7,f8; knight=b8,g8; pawn=b6,a7,c7,d7,e7,f7,g7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01345", "split": "perception", "task_type": "material_piece_counts", "fen": "2q1k2r/R2p1p1p/6p1/1Pp2nB1/8/1P1Q1P2/1b3P1P/6K1 b k - 1 21", "prompt": "FEN: 2q1k2r/R2p1p1p/6p1/1Pp2nB1/8/1P1Q1P2/1b3P1P/6K1 b k - 1 21\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=1; bishop=1; knight=0; pawn=5.\nBlack counts: king=1; queen=1; rook=1; bishop=1; knight=1; pawn=5.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01346", "split": "perception", "task_type": "material_value_totals", "fen": "rn1qk2r/pp2npb1/2p5/3pP1B1/3P2b1/1BNQ4/PPP4p/R4R1K b kq - 0 14", "prompt": "FEN: rn1qk2r/pp2npb1/2p5/3pP1B1/3P2b1/1BNQ4/PPP4p/R4R1K b kq - 0 14\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=6; knight=3; pawn=5; total=33.\nBlack values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=6; total=37.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01347", "split": "perception", "task_type": "material_balance_trace", "fen": "2k5/p4R1p/1p2r3/8/8/3pBb1P/PP1K1P2/8 b - - 6 30", "prompt": "FEN: 2k5/p4R1p/1p2r3/8/8/3pBb1P/PP1K1P2/8 b - - 6 30\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=d2; queen=none; rook=f7; bishop=e3; knight=none; pawn=a2,b2,f2,h3 | black king=c8; queen=none; rook=e6; bishop=f3; knight=none; pawn=d3,b6,a7,h7\nCounts: white king=1; queen=0; rook=1; bishop=1; knight=0; pawn=4 | black king=1; queen=0; rook=1; bishop=1; knight=0; pawn=4\nValues: white total=12; black total=12\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01348", "split": "perception", "task_type": "multi_state_tracking", "fen": "5rk1/1pp2pp1/n1b1p2p/4P3/2P5/2B2BP1/5K1P/3R4 b - - 0 29", "prompt": "Starting FEN: 5rk1/1pp2pp1/n1b1p2p/4P3/2P5/2B2BP1/5K1P/3R4 b - - 0 29\nAfter the moves a6b8 d1d8 b8a6, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 29\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 3R1rk1/1pp2pp1/n1b1p2p/4P3/2P5/2B2BP1/5K1P/8 w - - 3 31", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "a6b8 d1d8 b8a6", "_multi_state_tracking_result": "3R1rk1/1pp2pp1/n1b1p2p/4P3/2P5/2B2BP1/5K1P/8 w - - 3 31", "diagnostic": true, "hard_gate": false, "moves": "a6b8 d1d8 b8a6"}} {"example_id": "perception_01349", "split": "perception", "task_type": "board_print", "fen": "5Q2/7p/6p1/6k1/3N1b1P/1P2p3/P4PP1/3R2K1 b - - 0 39", "prompt": "Position (FEN): 5Q2/7p/6p1/6k1/3N1b1P/1P2p3/P4PP1/3R2K1 b - - 0 39\nShow me the board.", "gold_answer": "8 . . . . . Q . .\n7 . . . . . . . p\n6 . . . . . . p .\n5 . . . . . . k .\n4 . . . N . b . P\n3 . P . . p . . .\n2 P . . . . P P .\n1 . . . R . . K .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01350", "split": "perception", "task_type": "board_to_fen", "fen": "rnbq1rk1/pp2nppp/4p2B/3pP3/2pP2Q1/P1PB4/2P2PPP/R3K1NR b KQ -", "prompt": "Here is the current board:\n8 r n b q . r k .\n7 p p . . n p p p\n6 . . . . p . . B\n5 . . . p P . . .\n4 . . p P . . Q .\n3 P . P B . . . .\n2 . . P . . P P P\n1 R . . . K . N R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "rnbq1rk1/pp2nppp/4p2B/3pP3/2pP2Q1/P1PB4/2P2PPP/R3K1NR b KQ - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01351", "split": "perception", "task_type": "piece_id", "fen": "rnbqk2r/3pppbp/p4np1/1PpP2B1/8/2N5/PP2PPPP/R2QKBNR w KQkq -", "prompt": "FEN: rnbqk2r/3pppbp/p4np1/1PpP2B1/8/2N5/PP2PPPP/R2QKBNR w KQkq -\nWhat piece is on h2?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "h2"}} {"example_id": "perception_01352", "split": "perception", "task_type": "material_count", "fen": "8/5B2/b1p3p1/4k3/5p1p/5Pb1/3K4/6B1 b - - 1 44", "prompt": "FEN: 8/5B2/b1p3p1/4k3/5p1p/5Pb1/3K4/6B1 b - - 1 44\nWhat is the material count for both sides?", "gold_answer": "White (4 pieces): 2 bishops, 1 king, 1 pawn. Black (7 pieces): 2 bishops, 1 king, 4 pawns. Black is up 3 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01353", "split": "perception", "task_type": "square_lookup", "fen": "4Q3/6k1/4K3/8/8/3B4/8/8 w - -", "prompt": "FEN: 4Q3/6k1/4K3/8/8/3B4/8/8 w - -\nWhat is on g7?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "g7=black king", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "g7", "diagnostic": true, "hard_gate": false, "square": "g7"}} {"example_id": "perception_01354", "split": "perception", "task_type": "rank_lookup", "fen": "r1bq1rk1/4bppp/p1np1n2/1p2p3/4P3/2N1N1P1/PPP2P1P/R1BQKB1R w KQ -", "prompt": "FEN: r1bq1rk1/4bppp/p1np1n2/1p2p3/4P3/2N1N1P1/PPP2P1P/R1BQKB1R w KQ -\nWhat is the compressed FEN row for rank 2?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 2: PPP2P1P", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "2", "_rank_lookup_row": "PPP2P1P", "diagnostic": true, "hard_gate": false, "rank": "2", "fen_rank_row": "PPP2P1P"}} {"example_id": "perception_01355", "split": "perception", "task_type": "square_coordinates", "fen": "2r3k1/p3Q1pp/8/3P3q/b4P2/8/PP6/1K2RR2 w - - 2 41", "prompt": "FEN: 2r3k1/p3Q1pp/8/3P3q/b4P2/8/PP6/1K2RR2 w - - 2 41\nFor square g2, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "g2: file=g; rank=2; fen_row_from_top=7; file_index=7", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "g2", "diagnostic": true, "hard_gate": false, "square": "g2"}} {"example_id": "perception_01356", "split": "perception", "task_type": "fen_rank_expansion", "fen": "4Q3/5pkp/6p1/5p2/p2q4/Pn3N1P/3r1PP1/5RK1 b - - 5 32", "prompt": "FEN: 4Q3/5pkp/6p1/5p2/p2q4/Pn3N1P/3r1PP1/5RK1 b - - 5 32\nCompressed rank 3 row: Pn3N1P\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 3: a=P; b=n; c=1; d=1; e=1; f=N; g=1; h=P", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "3", "_fen_rank_expansion_row": "Pn3N1P", "diagnostic": true, "hard_gate": false, "rank": "3", "fen_rank_row": "Pn3N1P"}} {"example_id": "perception_01357", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "2r2qk1/6pp/pQ1p4/1p1bpp2/1P2P3/3P3P/P4PP1/4R1K1 w - - 0 26", "prompt": "Rank 6 row before: pQ1p4\nFile b changes from Q to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 6: pQ1p4 -> p2p4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "b6b7", "_fen_rank_cell_edit_square": "b6", "_fen_rank_cell_edit_rank": "6", "_fen_rank_cell_edit_file": "b", "_fen_rank_cell_edit_before_row": "pQ1p4", "_fen_rank_cell_edit_after_row": "p2p4", "_fen_rank_cell_edit_before_fen": "Q", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "b6b7", "square": "b6", "rank": "6", "file": "b", "before_row": "pQ1p4", "after_row": "p2p4", "before_fen": "Q", "after_fen": "1"}} {"example_id": "perception_01358", "split": "perception", "task_type": "fen_board_edit", "fen": "4r3/8/6pk/8/8/8/3K4/1R6 b - -", "prompt": "Board FEN before: 4r3/8/6pk/8/8/8/3K4/1R6\nApply square edits: e8 r->1; e6 1->r\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 8/8/4r1pk/8/8/8/3K4/1R6", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "e8e6", "_fen_board_edit_board_fen_before": "4r3/8/6pk/8/8/8/3K4/1R6", "_fen_board_edit_board_fen_after": "8/8/4r1pk/8/8/8/3K4/1R6", "_fen_board_edit_edit_text": "e8 r->1; e6 1->r", "_fen_board_edit_changed_squares": [{"square": "e8", "before": "black rook", "after": "empty", "before_fen": "r", "after_fen": "1"}, {"square": "e6", "before": "empty", "after": "black rook", "before_fen": "1", "after_fen": "r"}], "diagnostic": true, "hard_gate": false, "move": "e8e6", "board_fen_before": "4r3/8/6pk/8/8/8/3K4/1R6", "board_fen_after": "8/8/4r1pk/8/8/8/3K4/1R6", "edit_text": "e8 r->1; e6 1->r", "changed_squares": [{"square": "e8", "before": "black rook", "after": "empty", "before_fen": "r", "after_fen": "1"}, {"square": "e6", "before": "empty", "after": "black rook", "before_fen": "1", "after_fen": "r"}]}} {"example_id": "perception_01359", "split": "perception", "task_type": "move_square_edits", "fen": "r1bqkbnr/pp3ppp/2n5/1B1p4/8/5N2/PP1PQPPP/RNB1K2R b KQkq -", "prompt": "Starting FEN: r1bqkbnr/pp3ppp/2n5/1B1p4/8/5N2/PP1PQPPP/RNB1K2R b KQkq -\nMove: d8e7\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: d8=black queen; e7=empty.\nSquares: d8 black queen->empty; e7 empty->black queen.\nRanks: rank 8 d q->1; rank 7 e 1->q.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "d8e7", "diagnostic": true, "hard_gate": false, "move": "d8e7"}} {"example_id": "perception_01360", "split": "perception", "task_type": "fen_assembly", "fen": "rn2r1k1/1b3ppp/p4q2/1p1pp3/8/PB1PQP2/1PP3PP/2K2RNR b - - 1 15", "prompt": "Starting FEN: rn2r1k1/1b3ppp/p4q2/1p1pp3/8/PB1PQP2/1PP3PP/2K2RNR b - - 1 15\nMove: a6a5\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 15\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black pawn a6a5.\nLookup: a6=black pawn; a5=empty.\nSquares: a6 black pawn->empty; a5 empty->black pawn.\nRanks: rank 6 a p->1; rank 5 a 1->p.\nResult FEN: rn2r1k1/1b3ppp/5q2/pp1pp3/8/PB1PQP2/1PP3PP/2K2RNR w - - 0 16", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "a6a5", "diagnostic": true, "hard_gate": false, "move": "a6a5"}} {"example_id": "perception_01361", "split": "perception", "task_type": "fen_row_application", "fen": "8/8/8/4k3/2K5/4R3/8/3r4 b - - 1 52", "prompt": "Starting FEN: 8/8/8/4k3/2K5/4R3/8/3r4 b - - 1 52\nMove: e5f4\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 52\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 5 4k3->8; rank 4 2K5->2K2k2.\nResult FEN: 8/8/8/8/2K2k2/4R3/8/3r4 w - - 2 53", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "e5f4", "_fen_row_application_rank_rewrites": [{"rank": "5", "before": "4k3", "after": "8"}, {"rank": "4", "before": "2K5", "after": "2K2k2"}], "diagnostic": true, "hard_gate": false, "move": "e5f4", "rank_rewrites": [{"rank": "5", "before": "4k3", "after": "8"}, {"rank": "4", "before": "2K5", "after": "2K2k2"}]}} {"example_id": "perception_01362", "split": "perception", "task_type": "state_tracking", "fen": "r1bqkbnr/1pp2pp1/p1n1p2p/3p4/3P1B2/P1P2N1P/1P2PPP1/RN1QKB1R b KQkq - 1 6", "prompt": "Starting FEN: r1bqkbnr/1pp2pp1/p1n1p2p/3p4/3P1B2/P1P2N1P/1P2PPP1/RN1QKB1R b KQkq - 1 6\nAfter the moves g7g6, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 1\nFullmove number: 6\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r1bqkbnr/1pp2p2/p1n1p1pp/3p4/3P1B2/P1P2N1P/1P2PPP1/RN1QKB1R w KQkq - 0 7", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "g7g6", "_state_tracking_result": "r1bqkbnr/1pp2p2/p1n1p1pp/3p4/3P1B2/P1P2N1P/1P2PPP1/RN1QKB1R w KQkq - 0 7"}} {"example_id": "perception_01363", "split": "perception", "task_type": "material_inventory", "fen": "7R/2K5/2Q4P/5kP1/8/8/8/2r5 w - -", "prompt": "FEN: 7R/2K5/2Q4P/5kP1/8/8/8/2r5 w - -\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=c7; queen=c6; rook=h8; bishop=none; knight=none; pawn=g5,h6.\nBlack inventory: king=f5; queen=none; rook=c1; bishop=none; knight=none; pawn=none.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01364", "split": "perception", "task_type": "material_piece_counts", "fen": "r4rk1/ppqbppb1/2np1npB/7p/2B1P2P/1NN2P2/PPPQ2P1/2KR3R b - - 3 13", "prompt": "FEN: r4rk1/ppqbppb1/2np1npB/7p/2B1P2P/1NN2P2/PPPQ2P1/2KR3R b - - 3 13\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7.\nBlack counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01365", "split": "perception", "task_type": "material_value_totals", "fen": "5k2/p4p1p/1np2pp1/1p6/1PPP4/1P1K2PP/4rP2/R7 b - -", "prompt": "FEN: 5k2/p4p1p/1np2pp1/1p6/1PPP4/1P1K2PP/4rP2/R7 b - -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=5; bishop=0; knight=0; pawn=7; total=12.\nBlack values: king=0; queen=0; rook=5; bishop=0; knight=3; pawn=7; total=15.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01366", "split": "perception", "task_type": "material_balance_trace", "fen": "2K5/2P1k3/2n5/3B1ppp/8/p5P1/4PP1P/8 w - -", "prompt": "FEN: 2K5/2P1k3/2n5/3B1ppp/8/p5P1/4PP1P/8 w - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=c8; queen=none; rook=none; bishop=d5; knight=none; pawn=e2,f2,h2,g3,c7 | black king=e7; queen=none; rook=none; bishop=none; knight=c6; pawn=a3,f5,g5,h5\nCounts: white king=1; queen=0; rook=0; bishop=1; knight=0; pawn=5 | black king=1; queen=0; rook=0; bishop=0; knight=1; pawn=4\nValues: white total=8; black total=7\nBalance: White is up 1 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01367", "split": "perception", "task_type": "multi_state_tracking", "fen": "rnbqkbnr/ppppp1pp/8/5p2/2P2P2/8/PP1PP1PP/RNBQKBNR b KQkq -", "prompt": "Starting FEN: rnbqkbnr/ppppp1pp/8/5p2/2P2P2/8/PP1PP1PP/RNBQKBNR b KQkq - 0 1\nAfter the moves g7g6 g2g4 f8h6, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rnbqk1nr/ppppp2p/6pb/5p2/2P2PP1/8/PP1PP2P/RNBQKBNR w KQkq - 1 3", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "g7g6 g2g4 f8h6", "_multi_state_tracking_result": "rnbqk1nr/ppppp2p/6pb/5p2/2P2PP1/8/PP1PP2P/RNBQKBNR w KQkq - 1 3", "diagnostic": true, "hard_gate": false, "moves": "g7g6 g2g4 f8h6"}} {"example_id": "perception_01368", "split": "perception", "task_type": "board_print", "fen": "r1bb1rk1/3n1ppp/pp1P1n2/2p5/P1N5/2N5/1P2BPPP/R1B2RK1 w - -", "prompt": "Position (FEN): r1bb1rk1/3n1ppp/pp1P1n2/2p5/P1N5/2N5/1P2BPPP/R1B2RK1 w - -\nShow me the board.", "gold_answer": "8 r . b b . r k .\n7 . . . n . p p p\n6 p p . P . n . .\n5 . . p . . . . .\n4 P . N . . . . .\n3 . . N . . . . .\n2 . P . . B P P P\n1 R . B . . R K .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01369", "split": "perception", "task_type": "board_to_fen", "fen": "8/8/8/5K2/4Q3/2k5/1b6/8 w - -", "prompt": "Here is the current board:\n8 . . . . . . . .\n7 . . . . . . . .\n6 . . . . . . . .\n5 . . . . . K . .\n4 . . . . Q . . .\n3 . . k . . . . .\n2 . b . . . . . .\n1 . . . . . . . .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "8/8/8/5K2/4Q3/2k5/1b6/8 w - - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01370", "split": "perception", "task_type": "piece_id", "fen": "rnbqkb1r/pp1ppppp/5n2/2p5/4P3/2P2N2/PP1P1PPP/RNBQKB1R b KQkq -", "prompt": "FEN: rnbqkb1r/pp1ppppp/5n2/2p5/4P3/2P2N2/PP1P1PPP/RNBQKB1R b KQkq -\nWhat piece is on f7?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "f7"}} {"example_id": "perception_01371", "split": "perception", "task_type": "material_count", "fen": "r2qk2r/p1p2pp1/2p2n1p/4p3/2p1P3/3P1Q1P/PPP2PP1/R1B1K2R w KQkq -", "prompt": "FEN: r2qk2r/p1p2pp1/2p2n1p/4p3/2p1P3/3P1Q1P/PPP2PP1/R1B1K2R w KQkq -\nWhat is the material count for both sides?", "gold_answer": "White (13 pieces): 1 bishop, 1 king, 8 pawns, 1 queen, 2 rooks. Black (13 pieces): 1 king, 1 knight, 8 pawns, 1 queen, 2 rooks. Material is equal.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01372", "split": "perception", "task_type": "square_lookup", "fen": "3bR1k1/p2P4/5p1p/2p2BpP/1P6/2P5/P5P1/7K b - -", "prompt": "FEN: 3bR1k1/p2P4/5p1p/2p2BpP/1P6/2P5/P5P1/7K b - -\nWhat is on f6?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "f6=black pawn", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "f6", "diagnostic": true, "hard_gate": false, "square": "f6"}} {"example_id": "perception_01373", "split": "perception", "task_type": "rank_lookup", "fen": "r3r1k1/2R1pp1p/p2p2pb/3P4/p3b1P1/5N1P/PB3P2/R5K1 w - - 0 32", "prompt": "FEN: r3r1k1/2R1pp1p/p2p2pb/3P4/p3b1P1/5N1P/PB3P2/R5K1 w - - 0 32\nWhat is the compressed FEN row for rank 8?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 8: r3r1k1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "8", "_rank_lookup_row": "r3r1k1", "diagnostic": true, "hard_gate": false, "rank": "8", "fen_rank_row": "r3r1k1"}} {"example_id": "perception_01374", "split": "perception", "task_type": "square_coordinates", "fen": "3rk2r/ppp2ppp/2n1n3/4p3/1b6/2N2N2/PPP2PPP/R1B1R1K1 w k -", "prompt": "FEN: 3rk2r/ppp2ppp/2n1n3/4p3/1b6/2N2N2/PPP2PPP/R1B1R1K1 w k -\nFor square a5, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "a5: file=a; rank=5; fen_row_from_top=4; file_index=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "a5", "diagnostic": true, "hard_gate": false, "square": "a5"}} {"example_id": "perception_01375", "split": "perception", "task_type": "fen_rank_expansion", "fen": "3r2k1/3Q1p1p/R2B1qp1/1Pp5/2b5/4P2P/5PP1/6K1 w - -", "prompt": "FEN: 3r2k1/3Q1p1p/R2B1qp1/1Pp5/2b5/4P2P/5PP1/6K1 w - -\nCompressed rank 1 row: 6K1\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 1: a=1; b=1; c=1; d=1; e=1; f=1; g=K; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "1", "_fen_rank_expansion_row": "6K1", "diagnostic": true, "hard_gate": false, "rank": "1", "fen_rank_row": "6K1"}} {"example_id": "perception_01376", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r4rk1/4bppp/p2pbn2/2q5/4P3/2NQB3/PPP2PPP/R2R2K1 b - -", "prompt": "Rank 5 row before: 2q5\nFile d changes from 1 to n. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 5: 2q5 -> 2qn4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "f6d5", "_fen_rank_cell_edit_square": "d5", "_fen_rank_cell_edit_rank": "5", "_fen_rank_cell_edit_file": "d", "_fen_rank_cell_edit_before_row": "2q5", "_fen_rank_cell_edit_after_row": "2qn4", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "n", "diagnostic": true, "hard_gate": false, "move": "f6d5", "square": "d5", "rank": "5", "file": "d", "before_row": "2q5", "after_row": "2qn4", "before_fen": "1", "after_fen": "n"}} {"example_id": "perception_01377", "split": "perception", "task_type": "fen_board_edit", "fen": "8/6kp/p4qp1/6n1/2P2R2/6P1/P2P2QP/4R1K1 b - - 0 26", "prompt": "Board FEN before: 8/6kp/p4qp1/6n1/2P2R2/6P1/P2P2QP/4R1K1\nApply square edits: f6 q->1; a1 1->q\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 8/6kp/p5p1/6n1/2P2R2/6P1/P2P2QP/q3R1K1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "f6a1", "_fen_board_edit_board_fen_before": "8/6kp/p4qp1/6n1/2P2R2/6P1/P2P2QP/4R1K1", "_fen_board_edit_board_fen_after": "8/6kp/p5p1/6n1/2P2R2/6P1/P2P2QP/q3R1K1", "_fen_board_edit_edit_text": "f6 q->1; a1 1->q", "_fen_board_edit_changed_squares": [{"square": "f6", "before": "black queen", "after": "empty", "before_fen": "q", "after_fen": "1"}, {"square": "a1", "before": "empty", "after": "black queen", "before_fen": "1", "after_fen": "q"}], "diagnostic": true, "hard_gate": false, "move": "f6a1", "board_fen_before": "8/6kp/p4qp1/6n1/2P2R2/6P1/P2P2QP/4R1K1", "board_fen_after": "8/6kp/p5p1/6n1/2P2R2/6P1/P2P2QP/q3R1K1", "edit_text": "f6 q->1; a1 1->q", "changed_squares": [{"square": "f6", "before": "black queen", "after": "empty", "before_fen": "q", "after_fen": "1"}, {"square": "a1", "before": "empty", "after": "black queen", "before_fen": "1", "after_fen": "q"}]}} {"example_id": "perception_01378", "split": "perception", "task_type": "move_square_edits", "fen": "8/8/7R/Q3K3/8/8/1k6/8 w - -", "prompt": "Starting FEN: 8/8/7R/Q3K3/8/8/1k6/8 w - -\nMove: h6f6\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: h6=white rook; f6=empty.\nSquares: h6 white rook->empty; f6 empty->white rook.\nRanks: rank 6 h R->1; rank 6 f 1->R.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "h6f6", "diagnostic": true, "hard_gate": false, "move": "h6f6"}} {"example_id": "perception_01379", "split": "perception", "task_type": "fen_assembly", "fen": "rn1qk2r/ppp1nbpp/8/4Q3/4pP2/8/PPPP1KPP/RNB2B1R w kq -", "prompt": "Starting FEN: rn1qk2r/ppp1nbpp/8/4Q3/4pP2/8/PPPP1KPP/RNB2B1R w kq - 0 1\nMove: e5g7\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: kq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white queen e5g7. Captures black pawn on g7.\nLookup: e5=white queen; g7=black pawn.\nSquares: e5 white queen->empty; g7 black pawn->white queen.\nRanks: rank 5 e Q->1; rank 7 g p->Q.\nResult FEN: rn1qk2r/ppp1nbQp/8/8/4pP2/8/PPPP1KPP/RNB2B1R b kq - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "e5g7", "diagnostic": true, "hard_gate": false, "move": "e5g7"}} {"example_id": "perception_01380", "split": "perception", "task_type": "fen_row_application", "fen": "6k1/pp1n4/7p/2Pp1ppb/2P5/P3rP2/6PP/R4RK1 w - - 0 27", "prompt": "Starting FEN: 6k1/pp1n4/7p/2Pp1ppb/2P5/P3rP2/6PP/R4RK1 w - - 0 27\nMove: f1b1\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 27\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 1 R4RK1->RR4K1.\nResult FEN: 6k1/pp1n4/7p/2Pp1ppb/2P5/P3rP2/6PP/RR4K1 b - - 1 27", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "f1b1", "_fen_row_application_rank_rewrites": [{"rank": "1", "before": "R4RK1", "after": "RR4K1"}], "diagnostic": true, "hard_gate": false, "move": "f1b1", "rank_rewrites": [{"rank": "1", "before": "R4RK1", "after": "RR4K1"}]}} {"example_id": "perception_01381", "split": "perception", "task_type": "state_tracking", "fen": "2r1r2k/1pp1npqn/p2pb1p1/3N4/3PPB2/PB1Q4/1P3PP1/3RR1K1 w - - 10 26", "prompt": "Starting FEN: 2r1r2k/1pp1npqn/p2pb1p1/3N4/3PPB2/PB1Q4/1P3PP1/3RR1K1 w - - 10 26\nAfter the moves f4h2, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 10\nFullmove number: 26\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 2r1r2k/1pp1npqn/p2pb1p1/3N4/3PP3/PB1Q4/1P3PPB/3RR1K1 b - - 11 26", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "f4h2", "_state_tracking_result": "2r1r2k/1pp1npqn/p2pb1p1/3N4/3PP3/PB1Q4/1P3PPB/3RR1K1 b - - 11 26"}} {"example_id": "perception_01382", "split": "perception", "task_type": "material_inventory", "fen": "r4rk1/p1qnn3/1pbN2pp/2p1Np2/2P5/6P1/PQ1RPPBP/5RK1 b - - 6 20", "prompt": "FEN: r4rk1/p1qnn3/1pbN2pp/2p1Np2/2P5/6P1/PQ1RPPBP/5RK1 b - - 6 20\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=b2; rook=f1,d2; bishop=g2; knight=e5,d6; pawn=a2,e2,f2,h2,g3,c4.\nBlack inventory: king=g8; queen=c7; rook=a8,f8; bishop=c6; knight=d7,e7; pawn=c5,f5,b6,g6,h6,a7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01383", "split": "perception", "task_type": "material_piece_counts", "fen": "r3k2r/1p3pp1/p1pp3p/4Pb2/2Bp1P2/3P4/PPP3PP/R4RK1 w kq - 0 17", "prompt": "FEN: r3k2r/1p3pp1/p1pp3p/4Pb2/2Bp1P2/3P4/PPP3PP/R4RK1 w kq - 0 17\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=2; bishop=1; knight=0; pawn=8.\nBlack counts: king=1; queen=0; rook=2; bishop=1; knight=0; pawn=8.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01384", "split": "perception", "task_type": "material_value_totals", "fen": "2r3k1/p5p1/1p2p2p/3p4/3P4/1P6/P1r2PKP/4RR2 w - - 0 25", "prompt": "FEN: 2r3k1/p5p1/1p2p2p/3p4/3P4/1P6/P1r2PKP/4RR2 w - - 0 25\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=10; bishop=0; knight=0; pawn=5; total=15.\nBlack values: king=0; queen=0; rook=10; bishop=0; knight=0; pawn=6; total=16.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01385", "split": "perception", "task_type": "material_balance_trace", "fen": "2qr1k2/1p3p2/7p/1P5Q/4N3/p3P1P1/P5KP/8 b - - 2 32", "prompt": "FEN: 2qr1k2/1p3p2/7p/1P5Q/4N3/p3P1P1/P5KP/8 b - - 2 32\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g2; queen=h5; rook=none; bishop=none; knight=e4; pawn=a2,h2,e3,g3,b5 | black king=f8; queen=c8; rook=d8; bishop=none; knight=none; pawn=a3,h6,b7,f7\nCounts: white king=1; queen=1; rook=0; bishop=0; knight=1; pawn=5 | black king=1; queen=1; rook=1; bishop=0; knight=0; pawn=4\nValues: white total=17; black total=18\nBalance: Black is up 1 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01386", "split": "perception", "task_type": "multi_state_tracking", "fen": "8/6K1/4k3/5q2/8/8/8/8 b - - 10 80", "prompt": "Starting FEN: 8/6K1/4k3/5q2/8/8/8/8 b - - 10 80\nAfter the moves f5c2 g7f8, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 10\nFullmove number: 80\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 5K2/8/4k3/8/8/8/2q5/8 b - - 12 81", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "f5c2 g7f8", "_multi_state_tracking_result": "5K2/8/4k3/8/8/8/2q5/8 b - - 12 81", "diagnostic": true, "hard_gate": false, "moves": "f5c2 g7f8"}} {"example_id": "perception_01387", "split": "perception", "task_type": "board_print", "fen": "8/p2rR1pk/5rq1/6np/5p2/1Q3P2/PPP3PP/4R2K b - - 6 30", "prompt": "Position (FEN): 8/p2rR1pk/5rq1/6np/5p2/1Q3P2/PPP3PP/4R2K b - - 6 30\nShow me the board.", "gold_answer": "8 . . . . . . . .\n7 p . . r R . p k\n6 . . . . . r q .\n5 . . . . . . n p\n4 . . . . . p . .\n3 . Q . . . P . .\n2 P P P . . . P P\n1 . . . . R . . K\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01388", "split": "perception", "task_type": "board_to_fen", "fen": "k7/4Q3/2K5/8/2B5/8/8/8 w - -", "prompt": "Here is the current board:\n8 k . . . . . . .\n7 . . . . Q . . .\n6 . . K . . . . .\n5 . . . . . . . .\n4 . . B . . . . .\n3 . . . . . . . .\n2 . . . . . . . .\n1 . . . . . . . .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "k7/4Q3/2K5/8/2B5/8/8/8 w - - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01389", "split": "perception", "task_type": "piece_id", "fen": "r5k1/pp1bp1bp/1q1p1np1/6B1/2r1P1P1/1NN2P2/PPPQ3R/2KR4 b - - 1 17", "prompt": "FEN: r5k1/pp1bp1bp/1q1p1np1/6B1/2r1P1P1/1NN2P2/PPPQ3R/2KR4 b - - 1 17\nWhat piece is on f3?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "f3"}} {"example_id": "perception_01390", "split": "perception", "task_type": "material_count", "fen": "8/3k4/7p/3P3P/3K4/8/8/8 w - -", "prompt": "FEN: 8/3k4/7p/3P3P/3K4/8/8/8 w - -\nWhat is the material count for both sides?", "gold_answer": "White (3 pieces): 1 king, 2 pawns. Black (2 pieces): 1 king, 1 pawn. White is up 1 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01391", "split": "perception", "task_type": "square_lookup", "fen": "rn1qkbnr/pp3ppp/4b3/2pp4/5B2/1N2P3/PPP2PPP/RN1QKB1R w KQkq -", "prompt": "FEN: rn1qkbnr/pp3ppp/4b3/2pp4/5B2/1N2P3/PPP2PPP/RN1QKB1R w KQkq -\nWhat is on a1?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "a1=white rook", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "a1", "diagnostic": true, "hard_gate": false, "square": "a1"}} {"example_id": "perception_01392", "split": "perception", "task_type": "rank_lookup", "fen": "rn1qk1nr/pp1b1ppp/8/1Bb5/4p3/2N5/PP3PPP/R1BQK1NR w KQkq -", "prompt": "FEN: rn1qk1nr/pp1b1ppp/8/1Bb5/4p3/2N5/PP3PPP/R1BQK1NR w KQkq -\nWhat is the compressed FEN row for rank 8?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 8: rn1qk1nr", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "8", "_rank_lookup_row": "rn1qk1nr", "diagnostic": true, "hard_gate": false, "rank": "8", "fen_rank_row": "rn1qk1nr"}} {"example_id": "perception_01393", "split": "perception", "task_type": "square_coordinates", "fen": "1R6/6kp/p1N2p2/1pb3p1/n7/6B1/PPP2PPP/4R1K1 w - - 1 27", "prompt": "FEN: 1R6/6kp/p1N2p2/1pb3p1/n7/6B1/PPP2PPP/4R1K1 w - - 1 27\nFor square d3, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "d3: file=d; rank=3; fen_row_from_top=6; file_index=4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "d3", "diagnostic": true, "hard_gate": false, "square": "d3"}} {"example_id": "perception_01394", "split": "perception", "task_type": "fen_rank_expansion", "fen": "1r6/1p3n1k/p2p2pp/2p5/P1B1P3/1P1P2b1/1BP3Kq/R1QN4 w - -", "prompt": "FEN: 1r6/1p3n1k/p2p2pp/2p5/P1B1P3/1P1P2b1/1BP3Kq/R1QN4 w - -\nCompressed rank 3 row: 1P1P2b1\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 3: a=1; b=P; c=1; d=P; e=1; f=1; g=b; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "3", "_fen_rank_expansion_row": "1P1P2b1", "diagnostic": true, "hard_gate": false, "rank": "3", "fen_rank_row": "1P1P2b1"}} {"example_id": "perception_01395", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "4K3/8/1kQ5/8/5R2/8/8/8 b - -", "prompt": "Rank 6 row before: 1kQ5\nFile b changes from k to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 6: 1kQ5 -> 2k5", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "b6c6", "_fen_rank_cell_edit_square": "b6", "_fen_rank_cell_edit_rank": "6", "_fen_rank_cell_edit_file": "b", "_fen_rank_cell_edit_before_row": "1kQ5", "_fen_rank_cell_edit_after_row": "2k5", "_fen_rank_cell_edit_before_fen": "k", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "b6c6", "square": "b6", "rank": "6", "file": "b", "before_row": "1kQ5", "after_row": "2k5", "before_fen": "k", "after_fen": "1"}} {"example_id": "perception_01396", "split": "perception", "task_type": "fen_board_edit", "fen": "r1b1kb1r/1pqn1pp1/p2p1n1p/4pN2/4PPPP/2NB4/PPP1Q3/R1B1K2R b KQkq -", "prompt": "Board FEN before: r1b1kb1r/1pqn1pp1/p2p1n1p/4pN2/4PPPP/2NB4/PPP1Q3/R1B1K2R\nApply square edits: c7 q->1; c3 N->q\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: r1b1kb1r/1p1n1pp1/p2p1n1p/4pN2/4PPPP/2qB4/PPP1Q3/R1B1K2R", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "c7c3", "_fen_board_edit_board_fen_before": "r1b1kb1r/1pqn1pp1/p2p1n1p/4pN2/4PPPP/2NB4/PPP1Q3/R1B1K2R", "_fen_board_edit_board_fen_after": "r1b1kb1r/1p1n1pp1/p2p1n1p/4pN2/4PPPP/2qB4/PPP1Q3/R1B1K2R", "_fen_board_edit_edit_text": "c7 q->1; c3 N->q", "_fen_board_edit_changed_squares": [{"square": "c7", "before": "black queen", "after": "empty", "before_fen": "q", "after_fen": "1"}, {"square": "c3", "before": "white knight", "after": "black queen", "before_fen": "N", "after_fen": "q"}], "diagnostic": true, "hard_gate": false, "move": "c7c3", "board_fen_before": "r1b1kb1r/1pqn1pp1/p2p1n1p/4pN2/4PPPP/2NB4/PPP1Q3/R1B1K2R", "board_fen_after": "r1b1kb1r/1p1n1pp1/p2p1n1p/4pN2/4PPPP/2qB4/PPP1Q3/R1B1K2R", "edit_text": "c7 q->1; c3 N->q", "changed_squares": [{"square": "c7", "before": "black queen", "after": "empty", "before_fen": "q", "after_fen": "1"}, {"square": "c3", "before": "white knight", "after": "black queen", "before_fen": "N", "after_fen": "q"}]}} {"example_id": "perception_01397", "split": "perception", "task_type": "move_square_edits", "fen": "r4r2/pp2ppk1/2np2p1/2p5/2P1PP2/3P3R/q1N3P1/2RK1B2 b - - 0 19", "prompt": "Starting FEN: r4r2/pp2ppk1/2np2p1/2p5/2P1PP2/3P3R/q1N3P1/2RK1B2 b - - 0 19\nMove: e7e5\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: e7=black pawn; e5=empty.\nSquares: e7 black pawn->empty; e5 empty->black pawn.\nRanks: rank 7 e p->1; rank 5 e 1->p.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "e7e5", "diagnostic": true, "hard_gate": false, "move": "e7e5"}} {"example_id": "perception_01398", "split": "perception", "task_type": "fen_assembly", "fen": "5rk1/6p1/p7/3Q1b2/2pP4/q7/P2N1PPP/2R2RK1 b - - 1 30", "prompt": "Starting FEN: 5rk1/6p1/p7/3Q1b2/2pP4/q7/P2N1PPP/2R2RK1 b - - 1 30\nMove: f8f7\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 30\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black rook f8f7.\nLookup: f8=black rook; f7=empty.\nSquares: f8 black rook->empty; f7 empty->black rook.\nRanks: rank 8 f r->1; rank 7 f 1->r.\nResult FEN: 6k1/5rp1/p7/3Q1b2/2pP4/q7/P2N1PPP/2R2RK1 w - - 2 31", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "f8f7", "diagnostic": true, "hard_gate": false, "move": "f8f7"}} {"example_id": "perception_01399", "split": "perception", "task_type": "fen_row_application", "fen": "8/1R5p/1P4k1/8/5pp1/1r6/6KP/8 b - - 1 44", "prompt": "Starting FEN: 8/1R5p/1P4k1/8/5pp1/1r6/6KP/8 b - - 1 44\nMove: g6h5\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 44\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 6 1P4k1->1P6; rank 5 8->7k.\nResult FEN: 8/1R5p/1P6/7k/5pp1/1r6/6KP/8 w - - 2 45", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "g6h5", "_fen_row_application_rank_rewrites": [{"rank": "6", "before": "1P4k1", "after": "1P6"}, {"rank": "5", "before": "8", "after": "7k"}], "diagnostic": true, "hard_gate": false, "move": "g6h5", "rank_rewrites": [{"rank": "6", "before": "1P4k1", "after": "1P6"}, {"rank": "5", "before": "8", "after": "7k"}]}} {"example_id": "perception_01400", "split": "perception", "task_type": "state_tracking", "fen": "rnbqkb1r/pp3ppp/2p5/3pP3/8/5Q2/PPP2PPP/RNB1K1NR w KQkq - 0 8", "prompt": "Starting FEN: rnbqkb1r/pp3ppp/2p5/3pP3/8/5Q2/PPP2PPP/RNB1K1NR w KQkq - 0 8\nAfter the moves f3h5, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 8\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rnbqkb1r/pp3ppp/2p5/3pP2Q/8/8/PPP2PPP/RNB1K1NR b KQkq - 1 8", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "f3h5", "_state_tracking_result": "rnbqkb1r/pp3ppp/2p5/3pP2Q/8/8/PPP2PPP/RNB1K1NR b KQkq - 1 8"}} {"example_id": "perception_01401", "split": "perception", "task_type": "material_inventory", "fen": "r2qkbnr/1pp1p1pp/p1n2p2/1B1pPb2/3P1B2/8/PPP2PPP/RN1QK1NR w KQkq - 0 6", "prompt": "FEN: r2qkbnr/1pp1p1pp/p1n2p2/1B1pPb2/3P1B2/8/PPP2PPP/RN1QK1NR w KQkq - 0 6\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=e1; queen=d1; rook=a1,h1; bishop=f4,b5; knight=b1,g1; pawn=a2,b2,c2,f2,g2,h2,d4,e5.\nBlack inventory: king=e8; queen=d8; rook=a8,h8; bishop=f5,f8; knight=c6,g8; pawn=d5,a6,f6,b7,c7,e7,g7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01402", "split": "perception", "task_type": "material_piece_counts", "fen": "k7/7R/p7/3b4/1R6/6P1/3r1K1P/8 w - - 5 42", "prompt": "FEN: k7/7R/p7/3b4/1R6/6P1/3r1K1P/8 w - - 5 42\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=2; bishop=0; knight=0; pawn=2.\nBlack counts: king=1; queen=0; rook=1; bishop=1; knight=0; pawn=1.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01403", "split": "perception", "task_type": "material_value_totals", "fen": "2rq1rk1/p3Pppp/1p2p3/2p5/2P5/2N1P1P1/PB1P3P/R2Q1bK1 b - -", "prompt": "FEN: 2rq1rk1/p3Pppp/1p2p3/2p5/2P5/2N1P1P1/PB1P3P/R2Q1bK1 b - -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=5; bishop=3; knight=3; pawn=7; total=27.\nBlack values: king=0; queen=9; rook=10; bishop=3; knight=0; pawn=7; total=29.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01404", "split": "perception", "task_type": "material_balance_trace", "fen": "8/3P4/2k1K3/8/8/8/8/3r4 w - -", "prompt": "FEN: 8/3P4/2k1K3/8/8/8/8/3r4 w - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=e6; queen=none; rook=none; bishop=none; knight=none; pawn=d7 | black king=c6; queen=none; rook=d1; bishop=none; knight=none; pawn=none\nCounts: white king=1; queen=0; rook=0; bishop=0; knight=0; pawn=1 | black king=1; queen=0; rook=1; bishop=0; knight=0; pawn=0\nValues: white total=1; black total=5\nBalance: Black is up 4 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01405", "split": "perception", "task_type": "multi_state_tracking", "fen": "8/pp3pk1/2p3p1/3P2P1/2B1PpR1/2P2P1q/P4K2/7r w - -", "prompt": "Starting FEN: 8/pp3pk1/2p3p1/3P2P1/2B1PpR1/2P2P1q/P4K2/7r w - - 0 1\nAfter the moves g4h4 h1g1 h4h6, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 8/pp3pk1/2p3pR/3P2P1/2B1Pp2/2P2P1q/P4K2/6r1 b - - 3 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "g4h4 h1g1 h4h6", "_multi_state_tracking_result": "8/pp3pk1/2p3pR/3P2P1/2B1Pp2/2P2P1q/P4K2/6r1 b - - 3 2", "diagnostic": true, "hard_gate": false, "moves": "g4h4 h1g1 h4h6"}} {"example_id": "perception_01406", "split": "perception", "task_type": "board_print", "fen": "1R6/p4p1k/1p4p1/3pQ2p/1P2nP2/P5P1/5qKP/5B2 w - -", "prompt": "Position (FEN): 1R6/p4p1k/1p4p1/3pQ2p/1P2nP2/P5P1/5qKP/5B2 w - -\nShow me the board.", "gold_answer": "8 . R . . . . . .\n7 p . . . . p . k\n6 . p . . . . p .\n5 . . . p Q . . p\n4 . P . . n P . .\n3 P . . . . . P .\n2 . . . . . q K P\n1 . . . . . B . .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01407", "split": "perception", "task_type": "board_to_fen", "fen": "rn1qkb1r/pp2pppp/2pp1n2/8/3P2b1/4PN2/PPPB1PPP/RN1QKB1R w KQkq - 3 5", "prompt": "Here is the current board:\n8 r n . q k b . r\n7 p p . . p p p p\n6 . . p p . n . .\n5 . . . . . . . .\n4 . . . P . . b .\n3 . . . . P N . .\n2 P P P B . P P P\n1 R N . Q K B . R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 3\nFullmove number: 5\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "rn1qkb1r/pp2pppp/2pp1n2/8/3P2b1/4PN2/PPPB1PPP/RN1QKB1R w KQkq - 3 5", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01408", "split": "perception", "task_type": "piece_id", "fen": "r2q1rk1/1pp1n1pp/p2pbp2/8/2nP4/4BNP1/P1Q1PPBP/R4RK1 w - - 0 15", "prompt": "FEN: r2q1rk1/1pp1n1pp/p2pbp2/8/2nP4/4BNP1/P1Q1PPBP/R4RK1 w - - 0 15\nWhat piece is on f3?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white knight", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "f3"}} {"example_id": "perception_01409", "split": "perception", "task_type": "material_count", "fen": "5kr1/pp5Q/5Pn1/8/2P5/P3P3/1P4PP/5RK1 w - - 1 32", "prompt": "FEN: 5kr1/pp5Q/5Pn1/8/2P5/P3P3/1P4PP/5RK1 w - - 1 32\nWhat is the material count for both sides?", "gold_answer": "White (10 pieces): 1 king, 7 pawns, 1 queen, 1 rook. Black (5 pieces): 1 king, 1 knight, 2 pawns, 1 rook. White is up 11 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01410", "split": "perception", "task_type": "square_lookup", "fen": "rnbqk2r/ppp1bppp/4pn2/8/3P4/2N2N1P/PPP2PP1/R1BQKB1R w KQkq -", "prompt": "FEN: rnbqk2r/ppp1bppp/4pn2/8/3P4/2N2N1P/PPP2PP1/R1BQKB1R w KQkq -\nWhat is on a6?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "a6=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "a6", "diagnostic": true, "hard_gate": false, "square": "a6"}} {"example_id": "perception_01411", "split": "perception", "task_type": "rank_lookup", "fen": "rnbqkbnr/pp1p1ppp/4p3/2p5/4P3/3P4/PPP1QPPP/RNB1KBNR b KQkq - 1 3", "prompt": "FEN: rnbqkbnr/pp1p1ppp/4p3/2p5/4P3/3P4/PPP1QPPP/RNB1KBNR b KQkq - 1 3\nWhat is the compressed FEN row for rank 7?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 7: pp1p1ppp", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "7", "_rank_lookup_row": "pp1p1ppp", "diagnostic": true, "hard_gate": false, "rank": "7", "fen_rank_row": "pp1p1ppp"}} {"example_id": "perception_01412", "split": "perception", "task_type": "square_coordinates", "fen": "8/1p5p/2p4k/p2p1p2/5P1r/8/8/1K6 b - - 0 41", "prompt": "FEN: 8/1p5p/2p4k/p2p1p2/5P1r/8/8/1K6 b - - 0 41\nFor square c6, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "c6: file=c; rank=6; fen_row_from_top=3; file_index=3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "c6", "diagnostic": true, "hard_gate": false, "square": "c6"}} {"example_id": "perception_01413", "split": "perception", "task_type": "fen_rank_expansion", "fen": "8/1k6/4R2p/5N1P/1r2p1P1/3pK3/8/8 w - -", "prompt": "FEN: 8/1k6/4R2p/5N1P/1r2p1P1/3pK3/8/8 w - -\nCompressed rank 1 row: 8\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 1: a=1; b=1; c=1; d=1; e=1; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "1", "_fen_rank_expansion_row": "8", "diagnostic": true, "hard_gate": false, "rank": "1", "fen_rank_row": "8"}} {"example_id": "perception_01414", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "rnbqk2r/ppp2pbp/3p1np1/4p3/2PPP3/2N2P2/PP2N1PP/R1BQKB1R b KQkq -", "prompt": "Rank 6 row before: 3p1np1\nFile f changes from n to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 6: 3p1np1 -> 3p2p1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "f6d5", "_fen_rank_cell_edit_square": "f6", "_fen_rank_cell_edit_rank": "6", "_fen_rank_cell_edit_file": "f", "_fen_rank_cell_edit_before_row": "3p1np1", "_fen_rank_cell_edit_after_row": "3p2p1", "_fen_rank_cell_edit_before_fen": "n", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "f6d5", "square": "f6", "rank": "6", "file": "f", "before_row": "3p1np1", "after_row": "3p2p1", "before_fen": "n", "after_fen": "1"}} {"example_id": "perception_01415", "split": "perception", "task_type": "fen_board_edit", "fen": "r1bq1rk1/pp2ppbp/n2p1np1/2pP4/2P5/2NBP3/PP2NPPP/R1BQ1RK1 b - - 0 8", "prompt": "Board FEN before: r1bq1rk1/pp2ppbp/n2p1np1/2pP4/2P5/2NBP3/PP2NPPP/R1BQ1RK1\nApply square edits: e7 p->1; e6 1->p\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: r1bq1rk1/pp3pbp/n2ppnp1/2pP4/2P5/2NBP3/PP2NPPP/R1BQ1RK1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "e7e6", "_fen_board_edit_board_fen_before": "r1bq1rk1/pp2ppbp/n2p1np1/2pP4/2P5/2NBP3/PP2NPPP/R1BQ1RK1", "_fen_board_edit_board_fen_after": "r1bq1rk1/pp3pbp/n2ppnp1/2pP4/2P5/2NBP3/PP2NPPP/R1BQ1RK1", "_fen_board_edit_edit_text": "e7 p->1; e6 1->p", "_fen_board_edit_changed_squares": [{"square": "e7", "before": "black pawn", "after": "empty", "before_fen": "p", "after_fen": "1"}, {"square": "e6", "before": "empty", "after": "black pawn", "before_fen": "1", "after_fen": "p"}], "diagnostic": true, "hard_gate": false, "move": "e7e6", "board_fen_before": "r1bq1rk1/pp2ppbp/n2p1np1/2pP4/2P5/2NBP3/PP2NPPP/R1BQ1RK1", "board_fen_after": "r1bq1rk1/pp3pbp/n2ppnp1/2pP4/2P5/2NBP3/PP2NPPP/R1BQ1RK1", "edit_text": "e7 p->1; e6 1->p", "changed_squares": [{"square": "e7", "before": "black pawn", "after": "empty", "before_fen": "p", "after_fen": "1"}, {"square": "e6", "before": "empty", "after": "black pawn", "before_fen": "1", "after_fen": "p"}]}} {"example_id": "perception_01416", "split": "perception", "task_type": "move_square_edits", "fen": "6nk/p5pp/8/1Pq5/P1P5/1Kq5/8/8 w - - 0 50", "prompt": "Starting FEN: 6nk/p5pp/8/1Pq5/P1P5/1Kq5/8/8 w - - 0 50\nMove: b3a2\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: b3=white king; a2=empty.\nSquares: b3 white king->empty; a2 empty->white king.\nRanks: rank 3 b K->1; rank 2 a 1->K.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "b3a2", "diagnostic": true, "hard_gate": false, "move": "b3a2"}} {"example_id": "perception_01417", "split": "perception", "task_type": "fen_assembly", "fen": "rn2kbnr/pbppq3/1p2pp2/6pp/3P4/2PBP3/PP1N1PPP/R1BQNRK1 b kq - 1 8", "prompt": "Starting FEN: rn2kbnr/pbppq3/1p2pp2/6pp/3P4/2PBP3/PP1N1PPP/R1BQNRK1 b kq - 1 8\nMove: b7g2\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: kq\nEn passant: none\nHalfmove clock: 1\nFullmove number: 8\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black bishop b7g2. Captures white pawn on g2.\nLookup: b7=black bishop; g2=white pawn.\nSquares: b7 black bishop->empty; g2 white pawn->black bishop.\nRanks: rank 7 b b->1; rank 2 g P->b.\nResult FEN: rn2kbnr/p1ppq3/1p2pp2/6pp/3P4/2PBP3/PP1N1PbP/R1BQNRK1 w kq - 0 9", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "b7g2", "diagnostic": true, "hard_gate": false, "move": "b7g2"}} {"example_id": "perception_01418", "split": "perception", "task_type": "fen_row_application", "fen": "r2q1rk1/pp3ppp/2ppbn2/2n1p3/1bP1P3/2NPBPP1/PP2N1BP/R2Q1RK1 w - - 1 11", "prompt": "Starting FEN: r2q1rk1/pp3ppp/2ppbn2/2n1p3/1bP1P3/2NPBPP1/PP2N1BP/R2Q1RK1 w - - 1 11\nMove: e3f2\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 11\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 3 2NPBPP1->2NP1PP1; rank 2 PP2N1BP->PP2NBBP.\nResult FEN: r2q1rk1/pp3ppp/2ppbn2/2n1p3/1bP1P3/2NP1PP1/PP2NBBP/R2Q1RK1 b - - 2 11", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "e3f2", "_fen_row_application_rank_rewrites": [{"rank": "3", "before": "2NPBPP1", "after": "2NP1PP1"}, {"rank": "2", "before": "PP2N1BP", "after": "PP2NBBP"}], "diagnostic": true, "hard_gate": false, "move": "e3f2", "rank_rewrites": [{"rank": "3", "before": "2NPBPP1", "after": "2NP1PP1"}, {"rank": "2", "before": "PP2N1BP", "after": "PP2NBBP"}]}} {"example_id": "perception_01419", "split": "perception", "task_type": "state_tracking", "fen": "4k2r/2pn1ppp/2n1p3/8/1P6/P1P2P2/2P2P1P/R2R2K1 b k - 0 17", "prompt": "Starting FEN: 4k2r/2pn1ppp/2n1p3/8/1P6/P1P2P2/2P2P1P/R2R2K1 b k - 0 17\nAfter the moves e8d8, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: k\nEn passant: none\nHalfmove clock: 0\nFullmove number: 17\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 3k3r/2pn1ppp/2n1p3/8/1P6/P1P2P2/2P2P1P/R2R2K1 w - - 1 18", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "e8d8", "_state_tracking_result": "3k3r/2pn1ppp/2n1p3/8/1P6/P1P2P2/2P2P1P/R2R2K1 w - - 1 18"}} {"example_id": "perception_01420", "split": "perception", "task_type": "material_inventory", "fen": "8/B4k1p/4p3/2P3b1/3P4/P2K4/1r6/8 b - - 0 42", "prompt": "FEN: 8/B4k1p/4p3/2P3b1/3P4/P2K4/1r6/8 b - - 0 42\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=d3; queen=none; rook=none; bishop=a7; knight=none; pawn=a3,d4,c5.\nBlack inventory: king=f7; queen=none; rook=b2; bishop=g5; knight=none; pawn=e6,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01421", "split": "perception", "task_type": "material_piece_counts", "fen": "2r4r/1p2k3/p2pbp2/4n1p1/7p/2P1B2P/PP2BPP1/1K1R3R b - -", "prompt": "FEN: 2r4r/1p2k3/p2pbp2/4n1p1/7p/2P1B2P/PP2BPP1/1K1R3R b - -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=2; bishop=2; knight=0; pawn=6.\nBlack counts: king=1; queen=0; rook=2; bishop=1; knight=1; pawn=6.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01422", "split": "perception", "task_type": "material_value_totals", "fen": "r4rk1/pp1nppbp/1qp2np1/3p4/1P1P1B2/2N1PB1P/P1P2PP1/1R1Q1RK1 b - -", "prompt": "FEN: r4rk1/pp1nppbp/1qp2np1/3p4/1P1P1B2/2N1PB1P/P1P2PP1/1R1Q1RK1 b - -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=6; knight=3; pawn=8; total=36.\nBlack values: king=0; queen=9; rook=10; bishop=3; knight=6; pawn=8; total=36.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01423", "split": "perception", "task_type": "material_balance_trace", "fen": "r4rk1/pbp3pp/1bN5/8/4p3/1P2B2P/1P3PP1/R4RK1 w - -", "prompt": "FEN: r4rk1/pbp3pp/1bN5/8/4p3/1P2B2P/1P3PP1/R4RK1 w - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=none; rook=a1,f1; bishop=e3; knight=c6; pawn=b2,f2,g2,b3,h3 | black king=g8; queen=none; rook=a8,f8; bishop=b6,b7; knight=none; pawn=e4,a7,c7,g7,h7\nCounts: white king=1; queen=0; rook=2; bishop=1; knight=1; pawn=5 | black king=1; queen=0; rook=2; bishop=2; knight=0; pawn=5\nValues: white total=21; black total=21\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01424", "split": "perception", "task_type": "multi_state_tracking", "fen": "5rk1/1bq2ppp/p7/1p6/1P1Q4/P4P2/6PP/R4RK1 w - - 1 26", "prompt": "Starting FEN: 5rk1/1bq2ppp/p7/1p6/1P1Q4/P4P2/6PP/R4RK1 w - - 1 26\nAfter the moves f1c1 b7a8, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 26\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: b4rk1/2q2ppp/p7/1p6/1P1Q4/P4P2/6PP/R1R3K1 w - - 3 27", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "f1c1 b7a8", "_multi_state_tracking_result": "b4rk1/2q2ppp/p7/1p6/1P1Q4/P4P2/6PP/R1R3K1 w - - 3 27", "diagnostic": true, "hard_gate": false, "moves": "f1c1 b7a8"}} {"example_id": "perception_01425", "split": "perception", "task_type": "board_print", "fen": "2r1r1k1/2q1bppp/p2p4/4pP2/1NP5/1P2BQ2/P5PP/3n1RK1 w - -", "prompt": "Position (FEN): 2r1r1k1/2q1bppp/p2p4/4pP2/1NP5/1P2BQ2/P5PP/3n1RK1 w - -\nShow me the board.", "gold_answer": "8 . . r . r . k .\n7 . . q . b p p p\n6 p . . p . . . .\n5 . . . . p P . .\n4 . N P . . . . .\n3 . P . . B Q . .\n2 P . . . . . P P\n1 . . . n . R K .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01426", "split": "perception", "task_type": "board_to_fen", "fen": "r2qkb1r/7p/p2p1p1p/n3p3/1P1PP3/2P2N1P/P4PP1/RN3QK1 b kq - 0 17", "prompt": "Here is the current board:\n8 r . . q k b . r\n7 . . . . . . . p\n6 p . . p . p . p\n5 n . . . p . . .\n4 . P . P P . . .\n3 . . P . . N . P\n2 P . . . . P P .\n1 R N . . . Q K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: kq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 17\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r2qkb1r/7p/p2p1p1p/n3p3/1P1PP3/2P2N1P/P4PP1/RN3QK1 b kq - 0 17", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01427", "split": "perception", "task_type": "piece_id", "fen": "rnbqkb1r/pp3ppp/4pn2/2P3B1/2p1P3/2N5/PP3PPP/R2QKBNR b KQkq -", "prompt": "FEN: rnbqkb1r/pp3ppp/4pn2/2P3B1/2p1P3/2N5/PP3PPP/R2QKBNR b KQkq -\nWhat piece is on e6?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "e6"}} {"example_id": "perception_01428", "split": "perception", "task_type": "material_count", "fen": "2r5/7k/p1qbp1pp/2p5/2P3Q1/1PBR4/P4PP1/6K1 b - -", "prompt": "FEN: 2r5/7k/p1qbp1pp/2p5/2P3Q1/1PBR4/P4PP1/6K1 b - -\nWhat is the material count for both sides?", "gold_answer": "White (9 pieces): 1 bishop, 1 king, 5 pawns, 1 queen, 1 rook. Black (9 pieces): 1 bishop, 1 king, 5 pawns, 1 queen, 1 rook. Material is equal.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01429", "split": "perception", "task_type": "square_lookup", "fen": "r1b2rk1/1ppn2pp/pbn1B3/6B1/8/2N2N2/PP3PPP/3R1RK1 b - - 0 14", "prompt": "FEN: r1b2rk1/1ppn2pp/pbn1B3/6B1/8/2N2N2/PP3PPP/3R1RK1 b - - 0 14\nWhat is on f3?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "f3=white knight", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "f3", "diagnostic": true, "hard_gate": false, "square": "f3"}} {"example_id": "perception_01430", "split": "perception", "task_type": "rank_lookup", "fen": "r1r5/3bppk1/3p1np1/8/4P1PP/1B6/1PP5/2KN2RR b - - 0 25", "prompt": "FEN: r1r5/3bppk1/3p1np1/8/4P1PP/1B6/1PP5/2KN2RR b - - 0 25\nWhat is the compressed FEN row for rank 6?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 6: 3p1np1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "6", "_rank_lookup_row": "3p1np1", "diagnostic": true, "hard_gate": false, "rank": "6", "fen_rank_row": "3p1np1"}} {"example_id": "perception_01431", "split": "perception", "task_type": "square_coordinates", "fen": "3rqr2/pkp4p/1p2p1p1/3pP3/4N3/P6P/1PPQ1PP1/2KR3R b - - 0 20", "prompt": "FEN: 3rqr2/pkp4p/1p2p1p1/3pP3/4N3/P6P/1PPQ1PP1/2KR3R b - - 0 20\nFor square d2, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "d2: file=d; rank=2; fen_row_from_top=7; file_index=4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "d2", "diagnostic": true, "hard_gate": false, "square": "d2"}} {"example_id": "perception_01432", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r1b1kb1r/ppNnq1pp/2p2n2/8/8/8/PPP2PPP/RNBQ1RK1 b kq -", "prompt": "FEN: r1b1kb1r/ppNnq1pp/2p2n2/8/8/8/PPP2PPP/RNBQ1RK1 b kq -\nCompressed rank 2 row: PPP2PPP\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 2: a=P; b=P; c=P; d=1; e=1; f=P; g=P; h=P", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "2", "_fen_rank_expansion_row": "PPP2PPP", "diagnostic": true, "hard_gate": false, "rank": "2", "fen_rank_row": "PPP2PPP"}} {"example_id": "perception_01433", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "rn1q1rk1/pp2ppbp/2p1bNp1/4p1N1/2B4P/8/PPPP1PP1/R1BQK2R b KQ - 0 9", "prompt": "Rank 7 row before: pp2ppbp\nFile e changes from p to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 7: pp2ppbp -> pp3pbp", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "e7f6", "_fen_rank_cell_edit_square": "e7", "_fen_rank_cell_edit_rank": "7", "_fen_rank_cell_edit_file": "e", "_fen_rank_cell_edit_before_row": "pp2ppbp", "_fen_rank_cell_edit_after_row": "pp3pbp", "_fen_rank_cell_edit_before_fen": "p", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "e7f6", "square": "e7", "rank": "7", "file": "e", "before_row": "pp2ppbp", "after_row": "pp3pbp", "before_fen": "p", "after_fen": "1"}} {"example_id": "perception_01434", "split": "perception", "task_type": "fen_board_edit", "fen": "r2q1rk1/pp2bppp/3pbn2/4p3/3pP3/P2P3P/BPP1NPP1/R1BQ1RK1 b - - 3 11", "prompt": "Board FEN before: r2q1rk1/pp2bppp/3pbn2/4p3/3pP3/P2P3P/BPP1NPP1/R1BQ1RK1\nApply square edits: b7 p->1; b5 1->p\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: r2q1rk1/p3bppp/3pbn2/1p2p3/3pP3/P2P3P/BPP1NPP1/R1BQ1RK1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "b7b5", "_fen_board_edit_board_fen_before": "r2q1rk1/pp2bppp/3pbn2/4p3/3pP3/P2P3P/BPP1NPP1/R1BQ1RK1", "_fen_board_edit_board_fen_after": "r2q1rk1/p3bppp/3pbn2/1p2p3/3pP3/P2P3P/BPP1NPP1/R1BQ1RK1", "_fen_board_edit_edit_text": "b7 p->1; b5 1->p", "_fen_board_edit_changed_squares": [{"square": "b7", "before": "black pawn", "after": "empty", "before_fen": "p", "after_fen": "1"}, {"square": "b5", "before": "empty", "after": "black pawn", "before_fen": "1", "after_fen": "p"}], "diagnostic": true, "hard_gate": false, "move": "b7b5", "board_fen_before": "r2q1rk1/pp2bppp/3pbn2/4p3/3pP3/P2P3P/BPP1NPP1/R1BQ1RK1", "board_fen_after": "r2q1rk1/p3bppp/3pbn2/1p2p3/3pP3/P2P3P/BPP1NPP1/R1BQ1RK1", "edit_text": "b7 p->1; b5 1->p", "changed_squares": [{"square": "b7", "before": "black pawn", "after": "empty", "before_fen": "p", "after_fen": "1"}, {"square": "b5", "before": "empty", "after": "black pawn", "before_fen": "1", "after_fen": "p"}]}} {"example_id": "perception_01435", "split": "perception", "task_type": "move_square_edits", "fen": "3qk1B1/2p1b3/3p2pB/7p/r3P3/P2P1Q1P/2P2P2/2KR4 b - - 0 29", "prompt": "Starting FEN: 3qk1B1/2p1b3/3p2pB/7p/r3P3/P2P1Q1P/2P2P2/2KR4 b - - 0 29\nMove: a4b4\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: a4=black rook; b4=empty.\nSquares: a4 black rook->empty; b4 empty->black rook.\nRanks: rank 4 a r->1; rank 4 b 1->r.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "a4b4", "diagnostic": true, "hard_gate": false, "move": "a4b4"}} {"example_id": "perception_01436", "split": "perception", "task_type": "fen_assembly", "fen": "8/2R2p1p/2N3pk/8/6P1/5P2/3q2KP/r7 w - - 1 39", "prompt": "Starting FEN: 8/2R2p1p/2N3pk/8/6P1/5P2/3q2KP/r7 w - - 1 39\nMove: g2h3\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 39\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white king g2h3.\nLookup: g2=white king; h3=empty.\nSquares: g2 white king->empty; h3 empty->white king.\nRanks: rank 2 g K->1; rank 3 h 1->K.\nResult FEN: 8/2R2p1p/2N3pk/8/6P1/5P1K/3q3P/r7 b - - 2 39", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "g2h3", "diagnostic": true, "hard_gate": false, "move": "g2h3"}} {"example_id": "perception_01437", "split": "perception", "task_type": "fen_row_application", "fen": "5k2/p7/1p3P2/1P1PK3/P3n3/8/8/8 b - - 0 74", "prompt": "Starting FEN: 5k2/p7/1p3P2/1P1PK3/P3n3/8/8/8 b - - 0 74\nMove: a7a5\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 74\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 7 p7->8; rank 5 1P1PK3->pP1PK3.\nResult FEN: 5k2/8/1p3P2/pP1PK3/P3n3/8/8/8 w - a6 0 75", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "a7a5", "_fen_row_application_rank_rewrites": [{"rank": "7", "before": "p7", "after": "8"}, {"rank": "5", "before": "1P1PK3", "after": "pP1PK3"}], "diagnostic": true, "hard_gate": false, "move": "a7a5", "rank_rewrites": [{"rank": "7", "before": "p7", "after": "8"}, {"rank": "5", "before": "1P1PK3", "after": "pP1PK3"}]}} {"example_id": "perception_01438", "split": "perception", "task_type": "state_tracking", "fen": "1r2r3/ppQ5/3Pkp1p/3Np3/3nP1qP/6P1/PP3PK1/8 b - - 0 26", "prompt": "Starting FEN: 1r2r3/ppQ5/3Pkp1p/3Np3/3nP1qP/6P1/PP3PK1/8 b - - 0 26\nAfter the moves g4d1, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 26\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 1r2r3/ppQ5/3Pkp1p/3Np3/3nP2P/6P1/PP3PK1/3q4 w - - 1 27", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "g4d1", "_state_tracking_result": "1r2r3/ppQ5/3Pkp1p/3Np3/3nP2P/6P1/PP3PK1/3q4 w - - 1 27"}} {"example_id": "perception_01439", "split": "perception", "task_type": "material_inventory", "fen": "rn1qkb1r/pb2p1pp/1pp5/3nPp2/2BP4/2N2P2/PP4PP/R1BQK1NR b KQkq - 1 9", "prompt": "FEN: rn1qkb1r/pb2p1pp/1pp5/3nPp2/2BP4/2N2P2/PP4PP/R1BQK1NR b KQkq - 1 9\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=e1; queen=d1; rook=a1,h1; bishop=c1,c4; knight=g1,c3; pawn=a2,b2,g2,h2,f3,d4,e5.\nBlack inventory: king=e8; queen=d8; rook=a8,h8; bishop=b7,f8; knight=d5,b8; pawn=f5,b6,c6,a7,e7,g7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01440", "split": "perception", "task_type": "material_piece_counts", "fen": "2kr1r2/p1pp4/1p2pp1n/3Pn3/2P1N3/1P2PPN1/q5P1/1R3RK1 w - - 2 27", "prompt": "FEN: 2kr1r2/p1pp4/1p2pp1n/3Pn3/2P1N3/1P2PPN1/q5P1/1R3RK1 w - - 2 27\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=2; bishop=0; knight=2; pawn=6.\nBlack counts: king=1; queen=1; rook=2; bishop=0; knight=2; pawn=6.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01441", "split": "perception", "task_type": "material_value_totals", "fen": "8/2pk2p1/pp1p3p/1P1P1p1P/P1P2P2/2K5/6P1/8 b - -", "prompt": "FEN: 8/2pk2p1/pp1p3p/1P1P1p1P/P1P2P2/2K5/6P1/8 b - -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=0; bishop=0; knight=0; pawn=7; total=7.\nBlack values: king=0; queen=0; rook=0; bishop=0; knight=0; pawn=7; total=7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01442", "split": "perception", "task_type": "material_balance_trace", "fen": "8/1p6/p7/P1ppkPp1/6P1/2P1K3/1P6/8 w - - 0 33", "prompt": "FEN: 8/1p6/p7/P1ppkPp1/6P1/2P1K3/1P6/8 w - - 0 33\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=e3; queen=none; rook=none; bishop=none; knight=none; pawn=b2,c3,g4,a5,f5 | black king=e5; queen=none; rook=none; bishop=none; knight=none; pawn=c5,d5,g5,a6,b7\nCounts: white king=1; queen=0; rook=0; bishop=0; knight=0; pawn=5 | black king=1; queen=0; rook=0; bishop=0; knight=0; pawn=5\nValues: white total=5; black total=5\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01443", "split": "perception", "task_type": "multi_state_tracking", "fen": "r1bq1rk1/ppp1bppp/2n1pn2/3p4/5P2/2PPB1P1/PP1NP2P/R2QKBNR w KQ - 4 7", "prompt": "Starting FEN: r1bq1rk1/ppp1bppp/2n1pn2/3p4/5P2/2PPB1P1/PP1NP2P/R2QKBNR w KQ - 4 7\nAfter the moves d1a4 d8d7, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 4\nFullmove number: 7\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r1b2rk1/pppqbppp/2n1pn2/3p4/Q4P2/2PPB1P1/PP1NP2P/R3KBNR w KQ - 6 8", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "d1a4 d8d7", "_multi_state_tracking_result": "r1b2rk1/pppqbppp/2n1pn2/3p4/Q4P2/2PPB1P1/PP1NP2P/R3KBNR w KQ - 6 8", "diagnostic": true, "hard_gate": false, "moves": "d1a4 d8d7"}} {"example_id": "perception_01444", "split": "perception", "task_type": "board_print", "fen": "rnb2rk1/pp3ppp/1q1bpn2/2pp4/3P4/4PNB1/PPPN1PPP/1R1QKB1R w K -", "prompt": "Position (FEN): rnb2rk1/pp3ppp/1q1bpn2/2pp4/3P4/4PNB1/PPPN1PPP/1R1QKB1R w K -\nShow me the board.", "gold_answer": "8 r n b . . r k .\n7 p p . . . p p p\n6 . q . b p n . .\n5 . . p p . . . .\n4 . . . P . . . .\n3 . . . . P N B .\n2 P P P N . P P P\n1 . R . Q K B . R\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01445", "split": "perception", "task_type": "board_to_fen", "fen": "4R3/2N2ppk/2p3bp/1p2p3/1P3r2/6KP/5P2/8 b - - 5 35", "prompt": "Here is the current board:\n8 . . . . R . . .\n7 . . N . . p p k\n6 . . p . . . b p\n5 . p . . p . . .\n4 . P . . . r . .\n3 . . . . . . K P\n2 . . . . . P . .\n1 . . . . . . . .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 5\nFullmove number: 35\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "4R3/2N2ppk/2p3bp/1p2p3/1P3r2/6KP/5P2/8 b - - 5 35", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01446", "split": "perception", "task_type": "piece_id", "fen": "r1bqknnr/pp2bpp1/2ppp3/7p/1P1PP3/2PB1N2/P2N1PPP/R1BQ1RK1 b kq - 2 8", "prompt": "FEN: r1bqknnr/pp2bpp1/2ppp3/7p/1P1PP3/2PB1N2/P2N1PPP/R1BQ1RK1 b kq - 2 8\nWhat piece is on h2?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "h2"}} {"example_id": "perception_01447", "split": "perception", "task_type": "material_count", "fen": "r1b1k2r/ppppnpp1/2nb2p1/6B1/3P2B1/2P2R2/PP1NQP1P/R3K3 b Qkq - 5 14", "prompt": "FEN: r1b1k2r/ppppnpp1/2nb2p1/6B1/3P2B1/2P2R2/PP1NQP1P/R3K3 b Qkq - 5 14\nWhat is the material count for both sides?", "gold_answer": "White (13 pieces): 2 bishops, 1 king, 1 knight, 6 pawns, 1 queen, 2 rooks. Black (14 pieces): 2 bishops, 1 king, 2 knights, 7 pawns, 2 rooks. White is up 5 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01448", "split": "perception", "task_type": "square_lookup", "fen": "7k/6pp/8/4p3/K7/5P1P/5r2/8 w - - 1 45", "prompt": "FEN: 7k/6pp/8/4p3/K7/5P1P/5r2/8 w - - 1 45\nWhat is on h3?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "h3=white pawn", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "h3", "diagnostic": true, "hard_gate": false, "square": "h3"}} {"example_id": "perception_01449", "split": "perception", "task_type": "rank_lookup", "fen": "r1bq1rk1/pp2ppbp/2n2np1/2p5/4PP2/2NBBN2/PPP3PP/R2Q1RK1 b - - 3 9", "prompt": "FEN: r1bq1rk1/pp2ppbp/2n2np1/2p5/4PP2/2NBBN2/PPP3PP/R2Q1RK1 b - - 3 9\nWhat is the compressed FEN row for rank 3?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 3: 2NBBN2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "3", "_rank_lookup_row": "2NBBN2", "diagnostic": true, "hard_gate": false, "rank": "3", "fen_rank_row": "2NBBN2"}} {"example_id": "perception_01450", "split": "perception", "task_type": "square_coordinates", "fen": "7Q/8/4k3/1p6/1P6/P3P3/5PP1/R5K1 w - - 1 59", "prompt": "FEN: 7Q/8/4k3/1p6/1P6/P3P3/5PP1/R5K1 w - - 1 59\nFor square c7, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "c7: file=c; rank=7; fen_row_from_top=2; file_index=3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "c7", "diagnostic": true, "hard_gate": false, "square": "c7"}} {"example_id": "perception_01451", "split": "perception", "task_type": "fen_rank_expansion", "fen": "rn2kbnr/pbppq3/1p2p2p/4P1pQ/3P4/3BB1PN/PPP4P/RN3RK1 b kq - 1 13", "prompt": "FEN: rn2kbnr/pbppq3/1p2p2p/4P1pQ/3P4/3BB1PN/PPP4P/RN3RK1 b kq - 1 13\nCompressed rank 2 row: PPP4P\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 2: a=P; b=P; c=P; d=1; e=1; f=1; g=1; h=P", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "2", "_fen_rank_expansion_row": "PPP4P", "diagnostic": true, "hard_gate": false, "rank": "2", "fen_rank_row": "PPP4P"}} {"example_id": "perception_01452", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r1b2rk1/3n1ppp/1q2p3/p2pP3/1ppP1P2/5N2/P1Q1B1PP/R2NK2R w KQ -", "prompt": "Rank 4 row before: 1ppP1P2\nFile c changes from p to Q. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 4: 1ppP1P2 -> 1pQP1P2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "c2c4", "_fen_rank_cell_edit_square": "c4", "_fen_rank_cell_edit_rank": "4", "_fen_rank_cell_edit_file": "c", "_fen_rank_cell_edit_before_row": "1ppP1P2", "_fen_rank_cell_edit_after_row": "1pQP1P2", "_fen_rank_cell_edit_before_fen": "p", "_fen_rank_cell_edit_after_fen": "Q", "diagnostic": true, "hard_gate": false, "move": "c2c4", "square": "c4", "rank": "4", "file": "c", "before_row": "1ppP1P2", "after_row": "1pQP1P2", "before_fen": "p", "after_fen": "Q"}} {"example_id": "perception_01453", "split": "perception", "task_type": "fen_board_edit", "fen": "2Q5/1kp5/p1Nb4/3P4/1P5p/p6P/K3R1P1/5q2 b - -", "prompt": "Board FEN before: 2Q5/1kp5/p1Nb4/3P4/1P5p/p6P/K3R1P1/5q2\nApply square edits: b7 k->1; b6 1->k\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 2Q5/2p5/pkNb4/3P4/1P5p/p6P/K3R1P1/5q2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "b7b6", "_fen_board_edit_board_fen_before": "2Q5/1kp5/p1Nb4/3P4/1P5p/p6P/K3R1P1/5q2", "_fen_board_edit_board_fen_after": "2Q5/2p5/pkNb4/3P4/1P5p/p6P/K3R1P1/5q2", "_fen_board_edit_edit_text": "b7 k->1; b6 1->k", "_fen_board_edit_changed_squares": [{"square": "b7", "before": "black king", "after": "empty", "before_fen": "k", "after_fen": "1"}, {"square": "b6", "before": "empty", "after": "black king", "before_fen": "1", "after_fen": "k"}], "diagnostic": true, "hard_gate": false, "move": "b7b6", "board_fen_before": "2Q5/1kp5/p1Nb4/3P4/1P5p/p6P/K3R1P1/5q2", "board_fen_after": "2Q5/2p5/pkNb4/3P4/1P5p/p6P/K3R1P1/5q2", "edit_text": "b7 k->1; b6 1->k", "changed_squares": [{"square": "b7", "before": "black king", "after": "empty", "before_fen": "k", "after_fen": "1"}, {"square": "b6", "before": "empty", "after": "black king", "before_fen": "1", "after_fen": "k"}]}} {"example_id": "perception_01454", "split": "perception", "task_type": "move_square_edits", "fen": "r2q1rk1/pp2ppb1/1np2n1p/6p1/3P4/2NbPNBP/PP3PP1/R2Q1RK1 w - - 0 14", "prompt": "Starting FEN: r2q1rk1/pp2ppb1/1np2n1p/6p1/3P4/2NbPNBP/PP3PP1/R2Q1RK1 w - - 0 14\nMove: b2b3\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: b2=white pawn; b3=empty.\nSquares: b2 white pawn->empty; b3 empty->white pawn.\nRanks: rank 2 b P->1; rank 3 b 1->P.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "b2b3", "diagnostic": true, "hard_gate": false, "move": "b2b3"}} {"example_id": "perception_01455", "split": "perception", "task_type": "fen_assembly", "fen": "r2qk2r/ppp3pp/2nbbn2/1B1pp3/7B/P3P3/1PP2PPP/RN1QK1NR w KQkq - 6 9", "prompt": "Starting FEN: r2qk2r/ppp3pp/2nbbn2/1B1pp3/7B/P3P3/1PP2PPP/RN1QK1NR w KQkq - 6 9\nMove: c2c4\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 6\nFullmove number: 9\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white pawn c2c4.\nLookup: c2=white pawn; c4=empty.\nSquares: c2 white pawn->empty; c4 empty->white pawn.\nRanks: rank 2 c P->1; rank 4 c 1->P.\nResult FEN: r2qk2r/ppp3pp/2nbbn2/1B1pp3/2P4B/P3P3/1P3PPP/RN1QK1NR b KQkq - 0 9", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "c2c4", "diagnostic": true, "hard_gate": false, "move": "c2c4"}} {"example_id": "perception_01456", "split": "perception", "task_type": "fen_row_application", "fen": "4rknr/pp4pp/2p5/4Bb2/2B5/8/PPP2PPP/2KRR3 b - - 5 16", "prompt": "Starting FEN: 4rknr/pp4pp/2p5/4Bb2/2B5/8/PPP2PPP/2KRR3 b - - 5 16\nMove: f5e6\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 5\nFullmove number: 16\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 5 4Bb2->4B3; rank 6 2p5->2p1b3.\nResult FEN: 4rknr/pp4pp/2p1b3/4B3/2B5/8/PPP2PPP/2KRR3 w - - 6 17", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "f5e6", "_fen_row_application_rank_rewrites": [{"rank": "5", "before": "4Bb2", "after": "4B3"}, {"rank": "6", "before": "2p5", "after": "2p1b3"}], "diagnostic": true, "hard_gate": false, "move": "f5e6", "rank_rewrites": [{"rank": "5", "before": "4Bb2", "after": "4B3"}, {"rank": "6", "before": "2p5", "after": "2p1b3"}]}} {"example_id": "perception_01457", "split": "perception", "task_type": "state_tracking", "fen": "1r4k1/3R4/2R1P1Bp/3n4/8/1p5P/5PPK/4r3 b - -", "prompt": "Starting FEN: 1r4k1/3R4/2R1P1Bp/3n4/8/1p5P/5PPK/4r3 b - - 0 1\nAfter the moves e1e5, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 1r4k1/3R4/2R1P1Bp/3nr3/8/1p5P/5PPK/8 w - - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "e1e5", "_state_tracking_result": "1r4k1/3R4/2R1P1Bp/3nr3/8/1p5P/5PPK/8 w - - 1 2"}} {"example_id": "perception_01458", "split": "perception", "task_type": "material_inventory", "fen": "rnbqk2r/ppp1bpp1/5n1p/3p4/3P4/5PPN/PPP3BP/RNBQ1RK1 w kq -", "prompt": "FEN: rnbqk2r/ppp1bpp1/5n1p/3p4/3P4/5PPN/PPP3BP/RNBQ1RK1 w kq -\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=d1; rook=a1,f1; bishop=c1,g2; knight=b1,h3; pawn=a2,b2,c2,h2,f3,g3,d4.\nBlack inventory: king=e8; queen=d8; rook=a8,h8; bishop=e7,c8; knight=f6,b8; pawn=d5,h6,a7,b7,c7,f7,g7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01459", "split": "perception", "task_type": "material_piece_counts", "fen": "r1b1k2r/ppp1n1p1/3p4/3Pp2q/2P1P1pp/2N1B3/PPQ2PP1/1K1R3R b kq - 2 17", "prompt": "FEN: r1b1k2r/ppp1n1p1/3p4/3Pp2q/2P1P1pp/2N1B3/PPQ2PP1/1K1R3R b kq - 2 17\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=1; knight=1; pawn=7.\nBlack counts: king=1; queen=1; rook=2; bishop=1; knight=1; pawn=8.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01460", "split": "perception", "task_type": "material_value_totals", "fen": "2r3k1/1pp3p1/1p1p2p1/3Pp1p1/r1P1P3/6PP/PP3P2/R1R3K1 w - -", "prompt": "FEN: 2r3k1/1pp3p1/1p1p2p1/3Pp1p1/r1P1P3/6PP/PP3P2/R1R3K1 w - -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=10; bishop=0; knight=0; pawn=8; total=18.\nBlack values: king=0; queen=0; rook=10; bishop=0; knight=0; pawn=8; total=18.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01461", "split": "perception", "task_type": "material_balance_trace", "fen": "3R4/5kp1/4pp1p/p1r5/Ppp5/4K3/1PP2PPP/8 w - - 4 32", "prompt": "FEN: 3R4/5kp1/4pp1p/p1r5/Ppp5/4K3/1PP2PPP/8 w - - 4 32\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=e3; queen=none; rook=d8; bishop=none; knight=none; pawn=b2,c2,f2,g2,h2,a4 | black king=f7; queen=none; rook=c5; bishop=none; knight=none; pawn=b4,c4,a5,e6,f6,h6,g7\nCounts: white king=1; queen=0; rook=1; bishop=0; knight=0; pawn=6 | black king=1; queen=0; rook=1; bishop=0; knight=0; pawn=7\nValues: white total=11; black total=12\nBalance: Black is up 1 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01462", "split": "perception", "task_type": "multi_state_tracking", "fen": "r3r1k1/1b3ppp/pq1b1n2/4n3/3p1N2/6N1/PP1B1PPP/1BRQ1RK1 w - -", "prompt": "Starting FEN: r3r1k1/1b3ppp/pq1b1n2/4n3/3p1N2/6N1/PP1B1PPP/1BRQ1RK1 w - - 0 1\nAfter the moves c1c7 e8c8, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r1r3k1/1bR2ppp/pq1b1n2/4n3/3p1N2/6N1/PP1B1PPP/1B1Q1RK1 w - - 2 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "c1c7 e8c8", "_multi_state_tracking_result": "r1r3k1/1bR2ppp/pq1b1n2/4n3/3p1N2/6N1/PP1B1PPP/1B1Q1RK1 w - - 2 2", "diagnostic": true, "hard_gate": false, "moves": "c1c7 e8c8"}} {"example_id": "perception_01463", "split": "perception", "task_type": "board_print", "fen": "3r1rk1/pp2q2p/5p2/2pPp1pP/3n4/2N1Q3/PPP2PP1/2KRR3 w - -", "prompt": "Position (FEN): 3r1rk1/pp2q2p/5p2/2pPp1pP/3n4/2N1Q3/PPP2PP1/2KRR3 w - -\nShow me the board.", "gold_answer": "8 . . . r . r k .\n7 p p . . q . . p\n6 . . . . . p . .\n5 . . p P p . p P\n4 . . . n . . . .\n3 . . N . Q . . .\n2 P P P . . P P .\n1 . . K R R . . .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01464", "split": "perception", "task_type": "board_to_fen", "fen": "4r2k/3r3p/3pb3/pN2pp2/1pP2PqP/1P2Q1P1/P2R1R1K/8 b - -", "prompt": "Here is the current board:\n8 . . . . r . . k\n7 . . . r . . . p\n6 . . . p b . . .\n5 p N . . p p . .\n4 . p P . . P q P\n3 . P . . Q . P .\n2 P . . R . R . K\n1 . . . . . . . .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "4r2k/3r3p/3pb3/pN2pp2/1pP2PqP/1P2Q1P1/P2R1R1K/8 b - - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01465", "split": "perception", "task_type": "piece_id", "fen": "r1bq1rk1/1p3pp1/1b1p1n1p/pPpPn3/2P5/P1N3P1/4NPBP/R1BQK2R w KQ - 1 13", "prompt": "FEN: r1bq1rk1/1p3pp1/1b1p1n1p/pPpPn3/2P5/P1N3P1/4NPBP/R1BQK2R w KQ - 1 13\nWhat piece is on c5?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "c5"}} {"example_id": "perception_01466", "split": "perception", "task_type": "material_count", "fen": "rn1qk2r/p3npp1/1p2p2p/3pP2P/b1pP4/P1PB1N2/2P2PP1/R1BQK2R w KQkq -", "prompt": "FEN: rn1qk2r/p3npp1/1p2p2p/3pP2P/b1pP4/P1PB1N2/2P2PP1/R1BQK2R w KQkq -\nWhat is the material count for both sides?", "gold_answer": "White (15 pieces): 2 bishops, 1 king, 1 knight, 8 pawns, 1 queen, 2 rooks. Black (15 pieces): 1 bishop, 1 king, 2 knights, 8 pawns, 1 queen, 2 rooks. Material is equal.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01467", "split": "perception", "task_type": "square_lookup", "fen": "8/6Bp/1p2k1p1/PKn5/5P2/8/7P/8 b - -", "prompt": "FEN: 8/6Bp/1p2k1p1/PKn5/5P2/8/7P/8 b - -\nWhat is on c5?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "c5=black knight", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "c5", "diagnostic": true, "hard_gate": false, "square": "c5"}} {"example_id": "perception_01468", "split": "perception", "task_type": "rank_lookup", "fen": "8/1K4q1/8/P7/7n/2N2k1b/8/8 w - - 1 57", "prompt": "FEN: 8/1K4q1/8/P7/7n/2N2k1b/8/8 w - - 1 57\nWhat is the compressed FEN row for rank 5?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 5: P7", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "5", "_rank_lookup_row": "P7", "diagnostic": true, "hard_gate": false, "rank": "5", "fen_rank_row": "P7"}} {"example_id": "perception_01469", "split": "perception", "task_type": "square_coordinates", "fen": "6k1/2p2p1p/1p1p2p1/pR1P4/r1P5/2P3P1/5P1P/6K1 w - - 0 24", "prompt": "FEN: 6k1/2p2p1p/1p1p2p1/pR1P4/r1P5/2P3P1/5P1P/6K1 w - - 0 24\nFor square f4, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "f4: file=f; rank=4; fen_row_from_top=5; file_index=6", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "f4", "diagnostic": true, "hard_gate": false, "square": "f4"}} {"example_id": "perception_01470", "split": "perception", "task_type": "fen_rank_expansion", "fen": "rn1qkb1r/pp3ppp/4pn2/3p4/3P1Pb1/5N1P/PPP1B1P1/RNBQK2R b KQkq -", "prompt": "FEN: rn1qkb1r/pp3ppp/4pn2/3p4/3P1Pb1/5N1P/PPP1B1P1/RNBQK2R b KQkq -\nCompressed rank 2 row: PPP1B1P1\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 2: a=P; b=P; c=P; d=1; e=B; f=1; g=P; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "2", "_fen_rank_expansion_row": "PPP1B1P1", "diagnostic": true, "hard_gate": false, "rank": "2", "fen_rank_row": "PPP1B1P1"}} {"example_id": "perception_01471", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "2k4r/1b3p2/1p1Qp1p1/2P1P3/3p2n1/1P3N2/P3q1PP/2R4K b - -", "prompt": "Rank 3 row before: 1P3N2\nFile e changes from 1 to n. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 3: 1P3N2 -> 1P2nN2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "g4e3", "_fen_rank_cell_edit_square": "e3", "_fen_rank_cell_edit_rank": "3", "_fen_rank_cell_edit_file": "e", "_fen_rank_cell_edit_before_row": "1P3N2", "_fen_rank_cell_edit_after_row": "1P2nN2", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "n", "diagnostic": true, "hard_gate": false, "move": "g4e3", "square": "e3", "rank": "3", "file": "e", "before_row": "1P3N2", "after_row": "1P2nN2", "before_fen": "1", "after_fen": "n"}} {"example_id": "perception_01472", "split": "perception", "task_type": "fen_board_edit", "fen": "2r2rk1/3nq1pp/bppbp3/p2p1p2/P1PP4/1P1NPPP1/1B1n2BP/2RQR1K1 w - -", "prompt": "Board FEN before: 2r2rk1/3nq1pp/bppbp3/p2p1p2/P1PP4/1P1NPPP1/1B1n2BP/2RQR1K1\nApply square edits: e1 R->1; f1 1->R\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 2r2rk1/3nq1pp/bppbp3/p2p1p2/P1PP4/1P1NPPP1/1B1n2BP/2RQ1RK1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "e1f1", "_fen_board_edit_board_fen_before": "2r2rk1/3nq1pp/bppbp3/p2p1p2/P1PP4/1P1NPPP1/1B1n2BP/2RQR1K1", "_fen_board_edit_board_fen_after": "2r2rk1/3nq1pp/bppbp3/p2p1p2/P1PP4/1P1NPPP1/1B1n2BP/2RQ1RK1", "_fen_board_edit_edit_text": "e1 R->1; f1 1->R", "_fen_board_edit_changed_squares": [{"square": "e1", "before": "white rook", "after": "empty", "before_fen": "R", "after_fen": "1"}, {"square": "f1", "before": "empty", "after": "white rook", "before_fen": "1", "after_fen": "R"}], "diagnostic": true, "hard_gate": false, "move": "e1f1", "board_fen_before": "2r2rk1/3nq1pp/bppbp3/p2p1p2/P1PP4/1P1NPPP1/1B1n2BP/2RQR1K1", "board_fen_after": "2r2rk1/3nq1pp/bppbp3/p2p1p2/P1PP4/1P1NPPP1/1B1n2BP/2RQ1RK1", "edit_text": "e1 R->1; f1 1->R", "changed_squares": [{"square": "e1", "before": "white rook", "after": "empty", "before_fen": "R", "after_fen": "1"}, {"square": "f1", "before": "empty", "after": "white rook", "before_fen": "1", "after_fen": "R"}]}} {"example_id": "perception_01473", "split": "perception", "task_type": "move_square_edits", "fen": "rn2kbnr/pb2qppp/1pp5/3p4/3PPP2/2N2N2/PP4PP/R1BQKB1R w KQkq - 0 8", "prompt": "Starting FEN: rn2kbnr/pb2qppp/1pp5/3p4/3PPP2/2N2N2/PP4PP/R1BQKB1R w KQkq - 0 8\nMove: f3h4\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: f3=white knight; h4=empty.\nSquares: f3 white knight->empty; h4 empty->white knight.\nRanks: rank 3 f N->1; rank 4 h 1->N.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "f3h4", "diagnostic": true, "hard_gate": false, "move": "f3h4"}} {"example_id": "perception_01474", "split": "perception", "task_type": "fen_assembly", "fen": "8/p1R3p1/7k/6r1/3P2pp/2KBP3/r6P/6R1 w - - 0 40", "prompt": "Starting FEN: 8/p1R3p1/7k/6r1/3P2pp/2KBP3/r6P/6R1 w - - 0 40\nMove: c7e7\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 40\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white rook c7e7.\nLookup: c7=white rook; e7=empty.\nSquares: c7 white rook->empty; e7 empty->white rook.\nRanks: rank 7 c R->1; rank 7 e 1->R.\nResult FEN: 8/p3R1p1/7k/6r1/3P2pp/2KBP3/r6P/6R1 b - - 1 40", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "c7e7", "diagnostic": true, "hard_gate": false, "move": "c7e7"}} {"example_id": "perception_01475", "split": "perception", "task_type": "fen_row_application", "fen": "r1b2rk1/1p1nq1pp/2pbpn2/3pNp2/p1PP4/1P4P1/PBQNPPBP/R4RK1 w - -", "prompt": "Starting FEN: r1b2rk1/1p1nq1pp/2pbpn2/3pNp2/p1PP4/1P4P1/PBQNPPBP/R4RK1 w - - 0 1\nMove: b2a3\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 2 PBQNPPBP->P1QNPPBP; rank 3 1P4P1->BP4P1.\nResult FEN: r1b2rk1/1p1nq1pp/2pbpn2/3pNp2/p1PP4/BP4P1/P1QNPPBP/R4RK1 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "b2a3", "_fen_row_application_rank_rewrites": [{"rank": "2", "before": "PBQNPPBP", "after": "P1QNPPBP"}, {"rank": "3", "before": "1P4P1", "after": "BP4P1"}], "diagnostic": true, "hard_gate": false, "move": "b2a3", "rank_rewrites": [{"rank": "2", "before": "PBQNPPBP", "after": "P1QNPPBP"}, {"rank": "3", "before": "1P4P1", "after": "BP4P1"}]}} {"example_id": "perception_01476", "split": "perception", "task_type": "state_tracking", "fen": "rnbqk2r/ppp1bppp/4pn2/3p4/3P1B2/2P2N1P/PP2PPP1/RN1QKB1R w KQkq -", "prompt": "Starting FEN: rnbqk2r/ppp1bppp/4pn2/3p4/3P1B2/2P2N1P/PP2PPP1/RN1QKB1R w KQkq - 0 1\nAfter the moves f4e5, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rnbqk2r/ppp1bppp/4pn2/3pB3/3P4/2P2N1P/PP2PPP1/RN1QKB1R b KQkq - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "f4e5", "_state_tracking_result": "rnbqk2r/ppp1bppp/4pn2/3pB3/3P4/2P2N1P/PP2PPP1/RN1QKB1R b KQkq - 1 1"}} {"example_id": "perception_01477", "split": "perception", "task_type": "material_inventory", "fen": "3r3r/ppk1b3/1qp3pp/4P3/3p1P2/1P1R3P/P2Q2P1/2R3K1 b - - 0 27", "prompt": "FEN: 3r3r/ppk1b3/1qp3pp/4P3/3p1P2/1P1R3P/P2Q2P1/2R3K1 b - - 0 27\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=d2; rook=c1,d3; bishop=none; knight=none; pawn=a2,g2,b3,h3,f4,e5.\nBlack inventory: king=c7; queen=b6; rook=d8,h8; bishop=e7; knight=none; pawn=d4,c6,g6,h6,a7,b7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01478", "split": "perception", "task_type": "material_piece_counts", "fen": "r1b1rk2/pp4bp/2p2np1/2n3B1/8/1Q6/PPP3PP/3R1RK1 w - -", "prompt": "FEN: r1b1rk2/pp4bp/2p2np1/2n3B1/8/1Q6/PPP3PP/3R1RK1 w - -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=1; knight=0; pawn=5.\nBlack counts: king=1; queen=0; rook=2; bishop=2; knight=2; pawn=5.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01479", "split": "perception", "task_type": "material_value_totals", "fen": "r3r2k/pppq2pp/3b4/3Bpp2/2NB4/1P1P2P1/P1P2P1P/4QRK1 b - - 0 18", "prompt": "FEN: r3r2k/pppq2pp/3b4/3Bpp2/2NB4/1P1P2P1/P1P2P1P/4QRK1 b - - 0 18\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=5; bishop=6; knight=3; pawn=7; total=30.\nBlack values: king=0; queen=9; rook=10; bishop=3; knight=0; pawn=7; total=29.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01480", "split": "perception", "task_type": "material_balance_trace", "fen": "2k5/3n3R/8/2P2pP1/1p6/P3P1P1/6K1/3N4 w - -", "prompt": "FEN: 2k5/3n3R/8/2P2pP1/1p6/P3P1P1/6K1/3N4 w - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g2; queen=none; rook=h7; bishop=none; knight=d1; pawn=a3,e3,g3,c5,g5 | black king=c8; queen=none; rook=none; bishop=none; knight=d7; pawn=b4,f5\nCounts: white king=1; queen=0; rook=1; bishop=0; knight=1; pawn=5 | black king=1; queen=0; rook=0; bishop=0; knight=1; pawn=2\nValues: white total=13; black total=5\nBalance: White is up 8 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01481", "split": "perception", "task_type": "multi_state_tracking", "fen": "rnbqkb1r/pp3ppp/4p3/3n4/3Q4/4PN2/PP3PPP/RNB1KB1R w KQkq - 0 7", "prompt": "Starting FEN: rnbqkb1r/pp3ppp/4p3/3n4/3Q4/4PN2/PP3PPP/RNB1KB1R w KQkq - 0 7\nAfter the moves b2b3 b7b5, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 7\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rnbqkb1r/p4ppp/4p3/1p1n4/3Q4/1P2PN2/P4PPP/RNB1KB1R w KQkq - 0 8", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "b2b3 b7b5", "_multi_state_tracking_result": "rnbqkb1r/p4ppp/4p3/1p1n4/3Q4/1P2PN2/P4PPP/RNB1KB1R w KQkq - 0 8", "diagnostic": true, "hard_gate": false, "moves": "b2b3 b7b5"}} {"example_id": "perception_01482", "split": "perception", "task_type": "board_print", "fen": "8/5pk1/6p1/6Pp/4RprP/7K/8/8 w - -", "prompt": "Position (FEN): 8/5pk1/6p1/6Pp/4RprP/7K/8/8 w - -\nShow me the board.", "gold_answer": "8 . . . . . . . .\n7 . . . . . p k .\n6 . . . . . . p .\n5 . . . . . . P p\n4 . . . . R p r P\n3 . . . . . . . K\n2 . . . . . . . .\n1 . . . . . . . .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01483", "split": "perception", "task_type": "board_to_fen", "fen": "2kr1b1r/ppq1p1pp/3pb3/2p5/4PRB1/2PP2Q1/PP4PP/RN4K1 b - - 2 14", "prompt": "Here is the current board:\n8 . . k r . b . r\n7 p p q . p . p p\n6 . . . p b . . .\n5 . . p . . . . .\n4 . . . . P R B .\n3 . . P P . . Q .\n2 P P . . . . P P\n1 R N . . . . K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 2\nFullmove number: 14\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "2kr1b1r/ppq1p1pp/3pb3/2p5/4PRB1/2PP2Q1/PP4PP/RN4K1 b - - 2 14", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01484", "split": "perception", "task_type": "piece_id", "fen": "5bk1/1p3ppp/8/p1P5/1P6/P2R2P1/2r2PKP/1r1NR3 b - -", "prompt": "FEN: 5bk1/1p3ppp/8/p1P5/1P6/P2R2P1/2r2PKP/1r1NR3 b - -\nWhat piece is on h7?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "h7"}} {"example_id": "perception_01485", "split": "perception", "task_type": "material_count", "fen": "2q2rk1/pb2bppp/np1Npn2/3p4/1P1P1B2/P4NP1/4PPBP/2Q2RK1 b - - 1 16", "prompt": "FEN: 2q2rk1/pb2bppp/np1Npn2/3p4/1P1P1B2/P4NP1/4PPBP/2Q2RK1 b - - 1 16\nWhat is the material count for both sides?", "gold_answer": "White (14 pieces): 2 bishops, 1 king, 2 knights, 7 pawns, 1 queen, 1 rook. Black (14 pieces): 2 bishops, 1 king, 2 knights, 7 pawns, 1 queen, 1 rook. Material is equal.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01486", "split": "perception", "task_type": "square_lookup", "fen": "8/8/R2R4/1k6/8/4K3/8/8 b - -", "prompt": "FEN: 8/8/R2R4/1k6/8/4K3/8/8 b - -\nWhat is on e3?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "e3=white king", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "e3", "diagnostic": true, "hard_gate": false, "square": "e3"}} {"example_id": "perception_01487", "split": "perception", "task_type": "rank_lookup", "fen": "1n6/2Q2ppk/2p5/p1Pp4/3P4/5NPn/PP2q2P/R1B4K b - -", "prompt": "FEN: 1n6/2Q2ppk/2p5/p1Pp4/3P4/5NPn/PP2q2P/R1B4K b - -\nWhat is the compressed FEN row for rank 8?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 8: 1n6", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "8", "_rank_lookup_row": "1n6", "diagnostic": true, "hard_gate": false, "rank": "8", "fen_rank_row": "1n6"}} {"example_id": "perception_01488", "split": "perception", "task_type": "square_coordinates", "fen": "r2r2k1/pbq2p1p/1p2pnp1/2b5/1P1Np3/P1P1P1PP/2Q2PB1/R1B1R1K1 b - - 0 16", "prompt": "FEN: r2r2k1/pbq2p1p/1p2pnp1/2b5/1P1Np3/P1P1P1PP/2Q2PB1/R1B1R1K1 b - - 0 16\nFor square a4, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "a4: file=a; rank=4; fen_row_from_top=5; file_index=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "a4", "diagnostic": true, "hard_gate": false, "square": "a4"}} {"example_id": "perception_01489", "split": "perception", "task_type": "fen_rank_expansion", "fen": "1k1r1b1r/2pq3p/p1n1p2Q/1p5p/3PP3/1BN5/PPP3P1/1K1R3R w - -", "prompt": "FEN: 1k1r1b1r/2pq3p/p1n1p2Q/1p5p/3PP3/1BN5/PPP3P1/1K1R3R w - -\nCompressed rank 6 row: p1n1p2Q\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 6: a=p; b=1; c=n; d=1; e=p; f=1; g=1; h=Q", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "6", "_fen_rank_expansion_row": "p1n1p2Q", "diagnostic": true, "hard_gate": false, "rank": "6", "fen_rank_row": "p1n1p2Q"}} {"example_id": "perception_01490", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r1bq1rk1/pp3ppp/1np2b2/4p3/5P2/3P2PP/PPP1N1BK/R1BQ1R2 b - - 0 13", "prompt": "Rank 7 row before: pp3ppp\nFile g changes from p to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 7: pp3ppp -> pp3p1p", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "g7g5", "_fen_rank_cell_edit_square": "g7", "_fen_rank_cell_edit_rank": "7", "_fen_rank_cell_edit_file": "g", "_fen_rank_cell_edit_before_row": "pp3ppp", "_fen_rank_cell_edit_after_row": "pp3p1p", "_fen_rank_cell_edit_before_fen": "p", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "g7g5", "square": "g7", "rank": "7", "file": "g", "before_row": "pp3ppp", "after_row": "pp3p1p", "before_fen": "p", "after_fen": "1"}} {"example_id": "perception_01491", "split": "perception", "task_type": "fen_board_edit", "fen": "rn2k1nr/pp1b1pRp/8/3N4/3P4/4B3/PPP1KP2/R2Q3q b kq - 3 17", "prompt": "Board FEN before: rn2k1nr/pp1b1pRp/8/3N4/3P4/4B3/PPP1KP2/R2Q3q\nApply square edits: e8 k->1; f8 1->k\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: rn3knr/pp1b1pRp/8/3N4/3P4/4B3/PPP1KP2/R2Q3q", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "e8f8", "_fen_board_edit_board_fen_before": "rn2k1nr/pp1b1pRp/8/3N4/3P4/4B3/PPP1KP2/R2Q3q", "_fen_board_edit_board_fen_after": "rn3knr/pp1b1pRp/8/3N4/3P4/4B3/PPP1KP2/R2Q3q", "_fen_board_edit_edit_text": "e8 k->1; f8 1->k", "_fen_board_edit_changed_squares": [{"square": "e8", "before": "black king", "after": "empty", "before_fen": "k", "after_fen": "1"}, {"square": "f8", "before": "empty", "after": "black king", "before_fen": "1", "after_fen": "k"}], "diagnostic": true, "hard_gate": false, "move": "e8f8", "board_fen_before": "rn2k1nr/pp1b1pRp/8/3N4/3P4/4B3/PPP1KP2/R2Q3q", "board_fen_after": "rn3knr/pp1b1pRp/8/3N4/3P4/4B3/PPP1KP2/R2Q3q", "edit_text": "e8 k->1; f8 1->k", "changed_squares": [{"square": "e8", "before": "black king", "after": "empty", "before_fen": "k", "after_fen": "1"}, {"square": "f8", "before": "empty", "after": "black king", "before_fen": "1", "after_fen": "k"}]}} {"example_id": "perception_01492", "split": "perception", "task_type": "move_square_edits", "fen": "3r2r1/1p5k/pb1P1p1p/2pR4/1PP3b1/P4N2/1B3PP1/4R1K1 w - - 3 28", "prompt": "Starting FEN: 3r2r1/1p5k/pb1P1p1p/2pR4/1PP3b1/P4N2/1B3PP1/4R1K1 w - - 3 28\nMove: e1e4\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: e1=white rook; e4=empty.\nSquares: e1 white rook->empty; e4 empty->white rook.\nRanks: rank 1 e R->1; rank 4 e 1->R.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "e1e4", "diagnostic": true, "hard_gate": false, "move": "e1e4"}} {"example_id": "perception_01493", "split": "perception", "task_type": "fen_assembly", "fen": "rnb2rk1/pp2qppp/2p5/3p3n/3P4/2NBPN2/PP3PPP/R2QK2R w KQ -", "prompt": "Starting FEN: rnb2rk1/pp2qppp/2p5/3p3n/3P4/2NBPN2/PP3PPP/R2QK2R w KQ - 0 1\nMove: d3g6\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white bishop d3g6.\nLookup: d3=white bishop; g6=empty.\nSquares: d3 white bishop->empty; g6 empty->white bishop.\nRanks: rank 3 d B->1; rank 6 g 1->B.\nResult FEN: rnb2rk1/pp2qppp/2p3B1/3p3n/3P4/2N1PN2/PP3PPP/R2QK2R b KQ - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "d3g6", "diagnostic": true, "hard_gate": false, "move": "d3g6"}} {"example_id": "perception_01494", "split": "perception", "task_type": "fen_row_application", "fen": "3r1rk1/pp2bppp/3q4/2pnN3/P7/1PBP4/1P1QRPPP/4R1K1 w - - 7 18", "prompt": "Starting FEN: 3r1rk1/pp2bppp/3q4/2pnN3/P7/1PBP4/1P1QRPPP/4R1K1 w - - 7 18\nMove: e1f1\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 7\nFullmove number: 18\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 1 4R1K1->5RK1.\nResult FEN: 3r1rk1/pp2bppp/3q4/2pnN3/P7/1PBP4/1P1QRPPP/5RK1 b - - 8 18", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "e1f1", "_fen_row_application_rank_rewrites": [{"rank": "1", "before": "4R1K1", "after": "5RK1"}], "diagnostic": true, "hard_gate": false, "move": "e1f1", "rank_rewrites": [{"rank": "1", "before": "4R1K1", "after": "5RK1"}]}} {"example_id": "perception_01495", "split": "perception", "task_type": "state_tracking", "fen": "r4rk1/1pqbbpp1/p1p1pn1p/4N3/3P1P2/P1N4P/1PQ2PP1/1B1R1RK1 b - -", "prompt": "Starting FEN: r4rk1/1pqbbpp1/p1p1pn1p/4N3/3P1P2/P1N4P/1PQ2PP1/1B1R1RK1 b - - 0 1\nAfter the moves h6h5, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r4rk1/1pqbbpp1/p1p1pn2/4N2p/3P1P2/P1N4P/1PQ2PP1/1B1R1RK1 w - - 0 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "h6h5", "_state_tracking_result": "r4rk1/1pqbbpp1/p1p1pn2/4N2p/3P1P2/P1N4P/1PQ2PP1/1B1R1RK1 w - - 0 2"}} {"example_id": "perception_01496", "split": "perception", "task_type": "material_inventory", "fen": "r1bqkb1r/pppn1pp1/3p1n1p/4p3/3PP3/2NB1N2/PPP2PPP/R1BQ1RK1 b kq - 4 6", "prompt": "FEN: r1bqkb1r/pppn1pp1/3p1n1p/4p3/3PP3/2NB1N2/PPP2PPP/R1BQ1RK1 b kq - 4 6\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=d1; rook=a1,f1; bishop=c1,d3; knight=c3,f3; pawn=a2,b2,c2,f2,g2,h2,d4,e4.\nBlack inventory: king=e8; queen=d8; rook=a8,h8; bishop=c8,f8; knight=f6,d7; pawn=e5,d6,h6,a7,b7,c7,f7,g7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01497", "split": "perception", "task_type": "material_piece_counts", "fen": "r1bq1rk1/ppp2np1/3p2Qp/4n3/1bB5/5N1P/PB3PP1/RN3RK1 w - -", "prompt": "FEN: r1bq1rk1/ppp2np1/3p2Qp/4n3/1bB5/5N1P/PB3PP1/RN3RK1 w - -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=4.\nBlack counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=6.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01498", "split": "perception", "task_type": "material_value_totals", "fen": "rnbqkb1r/1pp1pp2/p6p/3pN1pn/3P3B/4P3/PPP2PPP/RN1QKB1R b KQkq -", "prompt": "FEN: rnbqkb1r/1pp1pp2/p6p/3pN1pn/3P3B/4P3/PPP2PPP/RN1QKB1R b KQkq -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=8; total=39.\nBlack values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=8; total=39.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01499", "split": "perception", "task_type": "material_balance_trace", "fen": "r4rk1/ppp1qpp1/2npbn1p/1Bb1p3/4P3/2PP1N1P/PP1N1PP1/R1BQR1K1 b - -", "prompt": "FEN: r4rk1/ppp1qpp1/2npbn1p/1Bb1p3/4P3/2PP1N1P/PP1N1PP1/R1BQR1K1 b - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=d1; rook=a1,e1; bishop=c1,b5; knight=d2,f3; pawn=a2,b2,f2,g2,c3,d3,h3,e4 | black king=g8; queen=e7; rook=a8,f8; bishop=c5,e6; knight=c6,f6; pawn=e5,d6,h6,a7,b7,c7,f7,g7\nCounts: white king=1; queen=1; rook=2; bishop=2; knight=2; pawn=8 | black king=1; queen=1; rook=2; bishop=2; knight=2; pawn=8\nValues: white total=39; black total=39\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01500", "split": "perception", "task_type": "multi_state_tracking", "fen": "2k2b2/5B2/p4p2/4pP2/8/3P4/PPK5/8 b - -", "prompt": "Starting FEN: 2k2b2/5B2/p4p2/4pP2/8/3P4/PPK5/8 b - - 0 1\nAfter the moves f8g7 f7b3, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 2k5/6b1/p4p2/4pP2/8/1B1P4/PPK5/8 b - - 2 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "f8g7 f7b3", "_multi_state_tracking_result": "2k5/6b1/p4p2/4pP2/8/1B1P4/PPK5/8 b - - 2 2", "diagnostic": true, "hard_gate": false, "moves": "f8g7 f7b3"}} {"example_id": "perception_01501", "split": "perception", "task_type": "board_print", "fen": "2b5/4B3/8/k7/6N1/6PK/8/8 b - - 0 69", "prompt": "Position (FEN): 2b5/4B3/8/k7/6N1/6PK/8/8 b - - 0 69\nShow me the board.", "gold_answer": "8 . . b . . . . .\n7 . . . . B . . .\n6 . . . . . . . .\n5 k . . . . . . .\n4 . . . . . . N .\n3 . . . . . . P K\n2 . . . . . . . .\n1 . . . . . . . .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01502", "split": "perception", "task_type": "board_to_fen", "fen": "8/8/R5Pk/pP5P/P2r3K/8/8/8 w - - 2 52", "prompt": "Here is the current board:\n8 . . . . . . . .\n7 . . . . . . . .\n6 R . . . . . P k\n5 p P . . . . . P\n4 P . . r . . . K\n3 . . . . . . . .\n2 . . . . . . . .\n1 . . . . . . . .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 2\nFullmove number: 52\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "8/8/R5Pk/pP5P/P2r3K/8/8/8 w - - 2 52", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01503", "split": "perception", "task_type": "piece_id", "fen": "r2qk2r/p1pn1ppp/1p1ppn2/8/2BPbB2/P1P2N2/2P2PPP/R2Q1RK1 w kq - 2 10", "prompt": "FEN: r2qk2r/p1pn1ppp/1p1ppn2/8/2BPbB2/P1P2N2/2P2PPP/R2Q1RK1 w kq - 2 10\nWhat piece is on f7?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "f7"}} {"example_id": "perception_01504", "split": "perception", "task_type": "material_count", "fen": "r1b1Rqk1/p1p4p/2np1BpQ/8/2p2P2/8/PPP3PP/6K1 w - -", "prompt": "FEN: r1b1Rqk1/p1p4p/2np1BpQ/8/2p2P2/8/PPP3PP/6K1 w - -\nWhat is the material count for both sides?", "gold_answer": "White (10 pieces): 1 bishop, 1 king, 6 pawns, 1 queen, 1 rook. Black (11 pieces): 1 bishop, 1 king, 1 knight, 6 pawns, 1 queen, 1 rook. Black is up 3 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01505", "split": "perception", "task_type": "square_lookup", "fen": "r3r1k1/pp1q1p2/n1pp1bpp/P3p3/4P3/2PPNN1P/1PQ2PP1/3R1RK1 w - -", "prompt": "FEN: r3r1k1/pp1q1p2/n1pp1bpp/P3p3/4P3/2PPNN1P/1PQ2PP1/3R1RK1 w - -\nWhat is on e5?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "e5=black pawn", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "e5", "diagnostic": true, "hard_gate": false, "square": "e5"}} {"example_id": "perception_01506", "split": "perception", "task_type": "rank_lookup", "fen": "rnb1kbnr/ppp1pppp/8/6N1/8/2N4q/PPPPBP1P/R1BQK1R1 b Qkq -", "prompt": "FEN: rnb1kbnr/ppp1pppp/8/6N1/8/2N4q/PPPPBP1P/R1BQK1R1 b Qkq -\nWhat is the compressed FEN row for rank 3?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 3: 2N4q", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "3", "_rank_lookup_row": "2N4q", "diagnostic": true, "hard_gate": false, "rank": "3", "fen_rank_row": "2N4q"}} {"example_id": "perception_01507", "split": "perception", "task_type": "square_coordinates", "fen": "r2q1rk1/p1p2pp1/5n1p/2b1n3/8/2PpBQ2/PP1N1PPP/R4RK1 w - - 4 15", "prompt": "FEN: r2q1rk1/p1p2pp1/5n1p/2b1n3/8/2PpBQ2/PP1N1PPP/R4RK1 w - - 4 15\nFor square c3, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "c3: file=c; rank=3; fen_row_from_top=6; file_index=3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "c3", "diagnostic": true, "hard_gate": false, "square": "c3"}} {"example_id": "perception_01508", "split": "perception", "task_type": "fen_rank_expansion", "fen": "8/8/8/4np2/k4N1P/6P1/5P2/6K1 w - - 1 54", "prompt": "FEN: 8/8/8/4np2/k4N1P/6P1/5P2/6K1 w - - 1 54\nCompressed rank 7 row: 8\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 7: a=1; b=1; c=1; d=1; e=1; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "7", "_fen_rank_expansion_row": "8", "diagnostic": true, "hard_gate": false, "rank": "7", "fen_rank_row": "8"}} {"example_id": "perception_01509", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r1q4b/p1p2k1p/4b3/1N6/4PB2/1P3P2/P4QPP/6K1 b - - 0 25", "prompt": "Rank 4 row before: 4PB2\nFile g changes from 1 to b. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 4: 4PB2 -> 4PBb1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "e6g4", "_fen_rank_cell_edit_square": "g4", "_fen_rank_cell_edit_rank": "4", "_fen_rank_cell_edit_file": "g", "_fen_rank_cell_edit_before_row": "4PB2", "_fen_rank_cell_edit_after_row": "4PBb1", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "b", "diagnostic": true, "hard_gate": false, "move": "e6g4", "square": "g4", "rank": "4", "file": "g", "before_row": "4PB2", "after_row": "4PBb1", "before_fen": "1", "after_fen": "b"}} {"example_id": "perception_01510", "split": "perception", "task_type": "fen_board_edit", "fen": "8/6k1/R7/8/5P2/6KP/8/1r6 b - -", "prompt": "Board FEN before: 8/6k1/R7/8/5P2/6KP/8/1r6\nApply square edits: g7 k->1; g8 1->k\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 6k1/8/R7/8/5P2/6KP/8/1r6", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "g7g8", "_fen_board_edit_board_fen_before": "8/6k1/R7/8/5P2/6KP/8/1r6", "_fen_board_edit_board_fen_after": "6k1/8/R7/8/5P2/6KP/8/1r6", "_fen_board_edit_edit_text": "g7 k->1; g8 1->k", "_fen_board_edit_changed_squares": [{"square": "g7", "before": "black king", "after": "empty", "before_fen": "k", "after_fen": "1"}, {"square": "g8", "before": "empty", "after": "black king", "before_fen": "1", "after_fen": "k"}], "diagnostic": true, "hard_gate": false, "move": "g7g8", "board_fen_before": "8/6k1/R7/8/5P2/6KP/8/1r6", "board_fen_after": "6k1/8/R7/8/5P2/6KP/8/1r6", "edit_text": "g7 k->1; g8 1->k", "changed_squares": [{"square": "g7", "before": "black king", "after": "empty", "before_fen": "k", "after_fen": "1"}, {"square": "g8", "before": "empty", "after": "black king", "before_fen": "1", "after_fen": "k"}]}} {"example_id": "perception_01511", "split": "perception", "task_type": "move_square_edits", "fen": "8/pp6/3p1rkp/2p1pRn1/2P1P3/3PQ3/PP4P1/6K1 w - - 0 39", "prompt": "Starting FEN: 8/pp6/3p1rkp/2p1pRn1/2P1P3/3PQ3/PP4P1/6K1 w - - 0 39\nMove: b2b3\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: b2=white pawn; b3=empty.\nSquares: b2 white pawn->empty; b3 empty->white pawn.\nRanks: rank 2 b P->1; rank 3 b 1->P.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "b2b3", "diagnostic": true, "hard_gate": false, "move": "b2b3"}} {"example_id": "perception_01512", "split": "perception", "task_type": "fen_assembly", "fen": "rn2kbnr/pb2q1pp/1ppp4/4P3/B7/2N2N2/PPP2PPP/R1BQK2R b KQkq - 0 10", "prompt": "Starting FEN: rn2kbnr/pb2q1pp/1ppp4/4P3/B7/2N2N2/PPP2PPP/R1BQK2R b KQkq - 0 10\nMove: g7g6\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 10\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black pawn g7g6.\nLookup: g7=black pawn; g6=empty.\nSquares: g7 black pawn->empty; g6 empty->black pawn.\nRanks: rank 7 g p->1; rank 6 g 1->p.\nResult FEN: rn2kbnr/pb2q2p/1ppp2p1/4P3/B7/2N2N2/PPP2PPP/R1BQK2R w KQkq - 0 11", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "g7g6", "diagnostic": true, "hard_gate": false, "move": "g7g6"}} {"example_id": "perception_01513", "split": "perception", "task_type": "fen_row_application", "fen": "5Nk1/R4bp1/2p2p2/3p3p/3P4/4P2P/5PP1/6K1 b - -", "prompt": "Starting FEN: 5Nk1/R4bp1/2p2p2/3p3p/3P4/4P2P/5PP1/6K1 b - - 0 1\nMove: g7g6\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 7 R4bp1->R4b2; rank 6 2p2p2->2p2pp1.\nResult FEN: 5Nk1/R4b2/2p2pp1/3p3p/3P4/4P2P/5PP1/6K1 w - - 0 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "g7g6", "_fen_row_application_rank_rewrites": [{"rank": "7", "before": "R4bp1", "after": "R4b2"}, {"rank": "6", "before": "2p2p2", "after": "2p2pp1"}], "diagnostic": true, "hard_gate": false, "move": "g7g6", "rank_rewrites": [{"rank": "7", "before": "R4bp1", "after": "R4b2"}, {"rank": "6", "before": "2p2p2", "after": "2p2pp1"}]}} {"example_id": "perception_01514", "split": "perception", "task_type": "state_tracking", "fen": "r1b2rk1/5ppp/p1p2n2/q7/8/2N1P3/PPP3PP/R2QK1NR b KQ - 0 13", "prompt": "Starting FEN: r1b2rk1/5ppp/p1p2n2/q7/8/2N1P3/PPP3PP/R2QK1NR b KQ - 0 13\nAfter the moves a5g5, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 0\nFullmove number: 13\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r1b2rk1/5ppp/p1p2n2/6q1/8/2N1P3/PPP3PP/R2QK1NR w KQ - 1 14", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "a5g5", "_state_tracking_result": "r1b2rk1/5ppp/p1p2n2/6q1/8/2N1P3/PPP3PP/R2QK1NR w KQ - 1 14"}} {"example_id": "perception_01515", "split": "perception", "task_type": "material_inventory", "fen": "rn3rk1/pp2ppbp/2pnb1p1/q7/3P1BP1/2N2N1P/PPP1BP2/R2QR1K1 w - -", "prompt": "FEN: rn3rk1/pp2ppbp/2pnb1p1/q7/3P1BP1/2N2N1P/PPP1BP2/R2QR1K1 w - -\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=d1; rook=a1,e1; bishop=e2,f4; knight=c3,f3; pawn=a2,b2,c2,f2,h3,d4,g4.\nBlack inventory: king=g8; queen=a5; rook=a8,f8; bishop=e6,g7; knight=d6,b8; pawn=c6,g6,a7,b7,e7,f7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01516", "split": "perception", "task_type": "material_piece_counts", "fen": "r1bqk2r/pppp2pp/2n5/3BPp2/1b1Pn3/5N2/PP3PPP/RNBQK2R w KQkq -", "prompt": "FEN: r1bqk2r/pppp2pp/2n5/3BPp2/1b1Pn3/5N2/PP3PPP/RNBQK2R w KQkq -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7.\nBlack counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01517", "split": "perception", "task_type": "material_value_totals", "fen": "2n3k1/5pp1/2Q1b2p/b2p4/2pP2P1/2P1N3/p1B2PPK/r7 w - -", "prompt": "FEN: 2n3k1/5pp1/2Q1b2p/b2p4/2pP2P1/2P1N3/p1B2PPK/r7 w - -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=0; bishop=3; knight=3; pawn=5; total=20.\nBlack values: king=0; queen=0; rook=5; bishop=6; knight=3; pawn=6; total=20.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01518", "split": "perception", "task_type": "material_balance_trace", "fen": "2R1B1k1/5p1p/p3p3/1p2N1p1/4q3/6P1/P3PPKP/8 w - -", "prompt": "FEN: 2R1B1k1/5p1p/p3p3/1p2N1p1/4q3/6P1/P3PPKP/8 w - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g2; queen=none; rook=c8; bishop=e8; knight=e5; pawn=a2,e2,f2,h2,g3 | black king=g8; queen=e4; rook=none; bishop=none; knight=none; pawn=b5,g5,a6,e6,f7,h7\nCounts: white king=1; queen=0; rook=1; bishop=1; knight=1; pawn=5 | black king=1; queen=1; rook=0; bishop=0; knight=0; pawn=6\nValues: white total=16; black total=15\nBalance: White is up 1 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01519", "split": "perception", "task_type": "multi_state_tracking", "fen": "b2r4/2Q2pkp/p4bp1/Np4q1/3P4/P2R1PPP/5K2/8 b - - 0 32", "prompt": "Starting FEN: b2r4/2Q2pkp/p4bp1/Np4q1/3P4/P2R1PPP/5K2/8 b - - 0 32\nAfter the moves h7h6 d3b3, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 32\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: b2r4/2Q2pk1/p4bpp/Np4q1/3P4/PR3PPP/5K2/8 b - - 1 33", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "h7h6 d3b3", "_multi_state_tracking_result": "b2r4/2Q2pk1/p4bpp/Np4q1/3P4/PR3PPP/5K2/8 b - - 1 33", "diagnostic": true, "hard_gate": false, "moves": "h7h6 d3b3"}} {"example_id": "perception_01520", "split": "perception", "task_type": "board_print", "fen": "8/8/p3b1p1/P6p/5P1P/3K2P1/1kp5/8 w - - 0 54", "prompt": "Position (FEN): 8/8/p3b1p1/P6p/5P1P/3K2P1/1kp5/8 w - - 0 54\nShow me the board.", "gold_answer": "8 . . . . . . . .\n7 . . . . . . . .\n6 p . . . b . p .\n5 P . . . . . . p\n4 . . . . . P . P\n3 . . . K . . P .\n2 . k p . . . . .\n1 . . . . . . . .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01521", "split": "perception", "task_type": "board_to_fen", "fen": "r1b1r1k1/pp2qpp1/2p2n1p/3p4/1P1Pn3/2NBPN2/P1Q2PPP/1R3RK1 b - -", "prompt": "Here is the current board:\n8 r . b . r . k .\n7 p p . . q p p .\n6 . . p . . n . p\n5 . . . p . . . .\n4 . P . P n . . .\n3 . . N B P N . .\n2 P . Q . . P P P\n1 . R . . . R K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r1b1r1k1/pp2qpp1/2p2n1p/3p4/1P1Pn3/2NBPN2/P1Q2PPP/1R3RK1 b - - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01522", "split": "perception", "task_type": "piece_id", "fen": "8/8/6k1/R7/4K3/8/8/8 w - -", "prompt": "FEN: 8/8/6k1/R7/4K3/8/8/8 w - -\nWhat piece is on a5?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white rook", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "a5"}} {"example_id": "perception_01523", "split": "perception", "task_type": "material_count", "fen": "3r2k1/p4p2/1p2p1pp/8/7P/2Pq1Q2/PP3P2/1K4R1 w - -", "prompt": "FEN: 3r2k1/p4p2/1p2p1pp/8/7P/2Pq1Q2/PP3P2/1K4R1 w - -\nWhat is the material count for both sides?", "gold_answer": "White (8 pieces): 1 king, 5 pawns, 1 queen, 1 rook. Black (9 pieces): 1 king, 6 pawns, 1 queen, 1 rook. Black is up 1 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01524", "split": "perception", "task_type": "square_lookup", "fen": "3r2k1/5ppp/B3p3/Pp1r4/4NP2/2RP3P/5KP1/8 b - - 4 34", "prompt": "FEN: 3r2k1/5ppp/B3p3/Pp1r4/4NP2/2RP3P/5KP1/8 b - - 4 34\nWhat is on h3?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "h3=white pawn", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "h3", "diagnostic": true, "hard_gate": false, "square": "h3"}} {"example_id": "perception_01525", "split": "perception", "task_type": "rank_lookup", "fen": "r1b1kbnr/1pp2ppp/p1n2q2/1B1p4/3P1P2/5N2/PPP3PP/RNBQK2R w KQkq - 0 7", "prompt": "FEN: r1b1kbnr/1pp2ppp/p1n2q2/1B1p4/3P1P2/5N2/PPP3PP/RNBQK2R w KQkq - 0 7\nWhat is the compressed FEN row for rank 6?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 6: p1n2q2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "6", "_rank_lookup_row": "p1n2q2", "diagnostic": true, "hard_gate": false, "rank": "6", "fen_rank_row": "p1n2q2"}} {"example_id": "perception_01526", "split": "perception", "task_type": "square_coordinates", "fen": "8/8/5k2/1B3p2/p4P2/P7/1P1K2P1/3b4 b - -", "prompt": "FEN: 8/8/5k2/1B3p2/p4P2/P7/1P1K2P1/3b4 b - -\nFor square d2, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "d2: file=d; rank=2; fen_row_from_top=7; file_index=4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "d2", "diagnostic": true, "hard_gate": false, "square": "d2"}} {"example_id": "perception_01527", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r1bqk2r/pppn1pb1/3p1npp/4p3/3PP1PP/2N1B3/PPP1BP2/R2QK1NR w KQkq -", "prompt": "FEN: r1bqk2r/pppn1pb1/3p1npp/4p3/3PP1PP/2N1B3/PPP1BP2/R2QK1NR w KQkq -\nCompressed rank 6 row: 3p1npp\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 6: a=1; b=1; c=1; d=p; e=1; f=n; g=p; h=p", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "6", "_fen_rank_expansion_row": "3p1npp", "diagnostic": true, "hard_gate": false, "rank": "6", "fen_rank_row": "3p1npp"}} {"example_id": "perception_01528", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "6k1/6p1/4p3/1p6/8/1NP2q2/2K5/8 b - -", "prompt": "Rank 6 row before: 4p3\nFile c changes from 1 to q. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 6: 4p3 -> 2q1p3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "f3c6", "_fen_rank_cell_edit_square": "c6", "_fen_rank_cell_edit_rank": "6", "_fen_rank_cell_edit_file": "c", "_fen_rank_cell_edit_before_row": "4p3", "_fen_rank_cell_edit_after_row": "2q1p3", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "q", "diagnostic": true, "hard_gate": false, "move": "f3c6", "square": "c6", "rank": "6", "file": "c", "before_row": "4p3", "after_row": "2q1p3", "before_fen": "1", "after_fen": "q"}} {"example_id": "perception_01529", "split": "perception", "task_type": "fen_board_edit", "fen": "2kr1bnr/pbppq1pp/1pn1pp2/8/1P1P4/P1P1PP2/3N2PP/R1BQKBNR w KQ - 0 8", "prompt": "Board FEN before: 2kr1bnr/pbppq1pp/1pn1pp2/8/1P1P4/P1P1PP2/3N2PP/R1BQKBNR\nApply square edits: g1 N->1; h3 1->N\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 2kr1bnr/pbppq1pp/1pn1pp2/8/1P1P4/P1P1PP1N/3N2PP/R1BQKB1R", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "g1h3", "_fen_board_edit_board_fen_before": "2kr1bnr/pbppq1pp/1pn1pp2/8/1P1P4/P1P1PP2/3N2PP/R1BQKBNR", "_fen_board_edit_board_fen_after": "2kr1bnr/pbppq1pp/1pn1pp2/8/1P1P4/P1P1PP1N/3N2PP/R1BQKB1R", "_fen_board_edit_edit_text": "g1 N->1; h3 1->N", "_fen_board_edit_changed_squares": [{"square": "g1", "before": "white knight", "after": "empty", "before_fen": "N", "after_fen": "1"}, {"square": "h3", "before": "empty", "after": "white knight", "before_fen": "1", "after_fen": "N"}], "diagnostic": true, "hard_gate": false, "move": "g1h3", "board_fen_before": "2kr1bnr/pbppq1pp/1pn1pp2/8/1P1P4/P1P1PP2/3N2PP/R1BQKBNR", "board_fen_after": "2kr1bnr/pbppq1pp/1pn1pp2/8/1P1P4/P1P1PP1N/3N2PP/R1BQKB1R", "edit_text": "g1 N->1; h3 1->N", "changed_squares": [{"square": "g1", "before": "white knight", "after": "empty", "before_fen": "N", "after_fen": "1"}, {"square": "h3", "before": "empty", "after": "white knight", "before_fen": "1", "after_fen": "N"}]}} {"example_id": "perception_01530", "split": "perception", "task_type": "move_square_edits", "fen": "8/pp4pk/2p1p2p/2PpP1q1/3Pp3/4Pb2/PP2NQr1/5RK1 w - - 0 25", "prompt": "Starting FEN: 8/pp4pk/2p1p2p/2PpP1q1/3Pp3/4Pb2/PP2NQr1/5RK1 w - - 0 25\nMove: g1h1\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: g1=white king; h1=empty.\nSquares: g1 white king->empty; h1 empty->white king.\nRanks: rank 1 g K->1; rank 1 h 1->K.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "g1h1", "diagnostic": true, "hard_gate": false, "move": "g1h1"}} {"example_id": "perception_01531", "split": "perception", "task_type": "fen_assembly", "fen": "7k/8/5K2/8/3N4/3B4/8/8 w - -", "prompt": "Starting FEN: 7k/8/5K2/8/3N4/3B4/8/8 w - - 0 1\nMove: d4f5\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white knight d4f5.\nLookup: d4=white knight; f5=empty.\nSquares: d4 white knight->empty; f5 empty->white knight.\nRanks: rank 4 d N->1; rank 5 f 1->N.\nResult FEN: 7k/8/5K2/5N2/8/3B4/8/8 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "d4f5", "diagnostic": true, "hard_gate": false, "move": "d4f5"}} {"example_id": "perception_01532", "split": "perception", "task_type": "fen_row_application", "fen": "r3k1nr/ppp2ppp/2n5/2bBp1N1/4P3/3P4/PPP2PPP/RN1b1RK1 w kq - 0 9", "prompt": "Starting FEN: r3k1nr/ppp2ppp/2n5/2bBp1N1/4P3/3P4/PPP2PPP/RN1b1RK1 w kq - 0 9\nMove: h2h3\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: kq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 9\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 2 PPP2PPP->PPP2PP1; rank 3 3P4->3P3P.\nResult FEN: r3k1nr/ppp2ppp/2n5/2bBp1N1/4P3/3P3P/PPP2PP1/RN1b1RK1 b kq - 0 9", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "h2h3", "_fen_row_application_rank_rewrites": [{"rank": "2", "before": "PPP2PPP", "after": "PPP2PP1"}, {"rank": "3", "before": "3P4", "after": "3P3P"}], "diagnostic": true, "hard_gate": false, "move": "h2h3", "rank_rewrites": [{"rank": "2", "before": "PPP2PPP", "after": "PPP2PP1"}, {"rank": "3", "before": "3P4", "after": "3P3P"}]}} {"example_id": "perception_01533", "split": "perception", "task_type": "state_tracking", "fen": "3r1rk1/5ppp/Qp2p3/2pn4/P7/1qPP4/1P1R2PP/5R1K w - - 2 26", "prompt": "Starting FEN: 3r1rk1/5ppp/Qp2p3/2pn4/P7/1qPP4/1P1R2PP/5R1K w - - 2 26\nAfter the moves f1d1, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 2\nFullmove number: 26\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 3r1rk1/5ppp/Qp2p3/2pn4/P7/1qPP4/1P1R2PP/3R3K b - - 3 26", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "f1d1", "_state_tracking_result": "3r1rk1/5ppp/Qp2p3/2pn4/P7/1qPP4/1P1R2PP/3R3K b - - 3 26"}} {"example_id": "perception_01534", "split": "perception", "task_type": "material_inventory", "fen": "8/5p2/6kp/8/6P1/5K2/8/8 b - -", "prompt": "FEN: 8/5p2/6kp/8/6P1/5K2/8/8 b - -\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=f3; queen=none; rook=none; bishop=none; knight=none; pawn=g4.\nBlack inventory: king=g6; queen=none; rook=none; bishop=none; knight=none; pawn=h6,f7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01535", "split": "perception", "task_type": "material_piece_counts", "fen": "1r4k1/5p1p/4ppq1/8/8/4PQP1/5PK1/R7 b - -", "prompt": "FEN: 1r4k1/5p1p/4ppq1/8/8/4PQP1/5PK1/R7 b - -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=1; bishop=0; knight=0; pawn=3.\nBlack counts: king=1; queen=1; rook=1; bishop=0; knight=0; pawn=4.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01536", "split": "perception", "task_type": "material_value_totals", "fen": "r2qkb1r/1b1n2p1/p3ppPp/3n4/Np1Np2P/4BP1B/PPPQ4/2KR3R w kq -", "prompt": "FEN: r2qkb1r/1b1n2p1/p3ppPp/3n4/Np1Np2P/4BP1B/PPPQ4/2KR3R w kq -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=6; total=37.\nBlack values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=7; total=38.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01537", "split": "perception", "task_type": "material_balance_trace", "fen": "8/8/8/8/2K5/8/k1B5/2B5 w - -", "prompt": "FEN: 8/8/8/8/2K5/8/k1B5/2B5 w - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=c4; queen=none; rook=none; bishop=c1,c2; knight=none; pawn=none | black king=a2; queen=none; rook=none; bishop=none; knight=none; pawn=none\nCounts: white king=1; queen=0; rook=0; bishop=2; knight=0; pawn=0 | black king=1; queen=0; rook=0; bishop=0; knight=0; pawn=0\nValues: white total=6; black total=0\nBalance: White is up 6 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01538", "split": "perception", "task_type": "multi_state_tracking", "fen": "rn2kb1r/pp2qp1p/2ppb1p1/8/8/B1P1N3/P1PPQPPP/1R2KB1R b Kkq -", "prompt": "Starting FEN: rn2kb1r/pp2qp1p/2ppb1p1/8/8/B1P1N3/P1PPQPPP/1R2KB1R b Kkq - 0 1\nAfter the moves b8d7 b1c1, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: Kkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r3kb1r/pp1nqp1p/2ppb1p1/8/8/B1P1N3/P1PPQPPP/2R1KB1R b Kkq - 2 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "b8d7 b1c1", "_multi_state_tracking_result": "r3kb1r/pp1nqp1p/2ppb1p1/8/8/B1P1N3/P1PPQPPP/2R1KB1R b Kkq - 2 2", "diagnostic": true, "hard_gate": false, "moves": "b8d7 b1c1"}} {"example_id": "perception_01539", "split": "perception", "task_type": "board_print", "fen": "rn1qk1nr/pp2ppbp/2p3p1/3p4/2PP2b1/3BPN1P/PP3PP1/RNBQK2R b KQkq -", "prompt": "Position (FEN): rn1qk1nr/pp2ppbp/2p3p1/3p4/2PP2b1/3BPN1P/PP3PP1/RNBQK2R b KQkq -\nShow me the board.", "gold_answer": "8 r n . q k . n r\n7 p p . . p p b p\n6 . . p . . . p .\n5 . . . p . . . .\n4 . . P P . . b .\n3 . . . B P N . P\n2 P P . . . P P .\n1 R N B Q K . . R\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01540", "split": "perception", "task_type": "board_to_fen", "fen": "3rr1k1/1b3ppp/p1n5/1p6/2p5/q1P1KN2/B1P1QPPP/3R3R w - - 4 22", "prompt": "Here is the current board:\n8 . . . r r . k .\n7 . b . . . p p p\n6 p . n . . . . .\n5 . p . . . . . .\n4 . . p . . . . .\n3 q . P . K N . .\n2 B . P . Q P P P\n1 . . . R . . . R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 4\nFullmove number: 22\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "3rr1k1/1b3ppp/p1n5/1p6/2p5/q1P1KN2/B1P1QPPP/3R3R w - - 4 22", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01541", "split": "perception", "task_type": "piece_id", "fen": "r4rk1/pp4pp/4p3/q1pp4/8/2b2P2/P1P3PP/1KBRQB1R w - -", "prompt": "FEN: r4rk1/pp4pp/4p3/q1pp4/8/2b2P2/P1P3PP/1KBRQB1R w - -\nWhat piece is on a7?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "a7"}} {"example_id": "perception_01542", "split": "perception", "task_type": "material_count", "fen": "rnbq2k1/pppp1ppp/5n2/6B1/2N1r3/2P5/PPP2PPP/R2QKB1R w KQ -", "prompt": "FEN: rnbq2k1/pppp1ppp/5n2/6B1/2N1r3/2P5/PPP2PPP/R2QKB1R w KQ -\nWhat is the material count for both sides?", "gold_answer": "White (14 pieces): 2 bishops, 1 king, 1 knight, 7 pawns, 1 queen, 2 rooks. Black (14 pieces): 1 bishop, 1 king, 2 knights, 7 pawns, 1 queen, 2 rooks. Material is equal.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01543", "split": "perception", "task_type": "square_lookup", "fen": "1Q6/2P5/6k1/3Q4/6p1/6K1/7P/8 w - -", "prompt": "FEN: 1Q6/2P5/6k1/3Q4/6p1/6K1/7P/8 w - -\nWhat is on g4?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "g4=black pawn", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "g4", "diagnostic": true, "hard_gate": false, "square": "g4"}} {"example_id": "perception_01544", "split": "perception", "task_type": "rank_lookup", "fen": "8/2p2p2/1p4kp/6p1/1P6/P5P1/1B2KP1r/3R4 w - - 4 37", "prompt": "FEN: 8/2p2p2/1p4kp/6p1/1P6/P5P1/1B2KP1r/3R4 w - - 4 37\nWhat is the compressed FEN row for rank 5?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 5: 6p1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "5", "_rank_lookup_row": "6p1", "diagnostic": true, "hard_gate": false, "rank": "5", "fen_rank_row": "6p1"}} {"example_id": "perception_01545", "split": "perception", "task_type": "square_coordinates", "fen": "r1bq1rk1/ppp1bppp/2np1n2/4p3/3P4/2NQ1N1P/PPP1BPP1/R1B2RK1 w - - 4 9", "prompt": "FEN: r1bq1rk1/ppp1bppp/2np1n2/4p3/3P4/2NQ1N1P/PPP1BPP1/R1B2RK1 w - - 4 9\nFor square c2, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "c2: file=c; rank=2; fen_row_from_top=7; file_index=3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "c2", "diagnostic": true, "hard_gate": false, "square": "c2"}} {"example_id": "perception_01546", "split": "perception", "task_type": "fen_rank_expansion", "fen": "8/2k5/8/8/1PP4R/4K3/3r3P/8 b - - 9 53", "prompt": "FEN: 8/2k5/8/8/1PP4R/4K3/3r3P/8 b - - 9 53\nCompressed rank 6 row: 8\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 6: a=1; b=1; c=1; d=1; e=1; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "6", "_fen_rank_expansion_row": "8", "diagnostic": true, "hard_gate": false, "rank": "6", "fen_rank_row": "8"}} {"example_id": "perception_01547", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r1bqkbnr/ppp2ppp/2np4/8/2BNP3/8/PPP2PPP/RNBQK2R b KQkq - 0 5", "prompt": "Rank 7 row before: ppp2ppp\nFile f changes from p to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 7: ppp2ppp -> ppp3pp", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "f7f5", "_fen_rank_cell_edit_square": "f7", "_fen_rank_cell_edit_rank": "7", "_fen_rank_cell_edit_file": "f", "_fen_rank_cell_edit_before_row": "ppp2ppp", "_fen_rank_cell_edit_after_row": "ppp3pp", "_fen_rank_cell_edit_before_fen": "p", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "f7f5", "square": "f7", "rank": "7", "file": "f", "before_row": "ppp2ppp", "after_row": "ppp3pp", "before_fen": "p", "after_fen": "1"}} {"example_id": "perception_01548", "split": "perception", "task_type": "fen_board_edit", "fen": "r1b1k2r/pp3ppp/3p4/2p1p1B1/4P3/3P4/PPPKnP1P/3R3R b kq - 0 14", "prompt": "Board FEN before: r1b1k2r/pp3ppp/3p4/2p1p1B1/4P3/3P4/PPPKnP1P/3R3R\nApply square edits: c8 b->1; g4 1->b\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: r3k2r/pp3ppp/3p4/2p1p1B1/4P1b1/3P4/PPPKnP1P/3R3R", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "c8g4", "_fen_board_edit_board_fen_before": "r1b1k2r/pp3ppp/3p4/2p1p1B1/4P3/3P4/PPPKnP1P/3R3R", "_fen_board_edit_board_fen_after": "r3k2r/pp3ppp/3p4/2p1p1B1/4P1b1/3P4/PPPKnP1P/3R3R", "_fen_board_edit_edit_text": "c8 b->1; g4 1->b", "_fen_board_edit_changed_squares": [{"square": "c8", "before": "black bishop", "after": "empty", "before_fen": "b", "after_fen": "1"}, {"square": "g4", "before": "empty", "after": "black bishop", "before_fen": "1", "after_fen": "b"}], "diagnostic": true, "hard_gate": false, "move": "c8g4", "board_fen_before": "r1b1k2r/pp3ppp/3p4/2p1p1B1/4P3/3P4/PPPKnP1P/3R3R", "board_fen_after": "r3k2r/pp3ppp/3p4/2p1p1B1/4P1b1/3P4/PPPKnP1P/3R3R", "edit_text": "c8 b->1; g4 1->b", "changed_squares": [{"square": "c8", "before": "black bishop", "after": "empty", "before_fen": "b", "after_fen": "1"}, {"square": "g4", "before": "empty", "after": "black bishop", "before_fen": "1", "after_fen": "b"}]}} {"example_id": "perception_01549", "split": "perception", "task_type": "move_square_edits", "fen": "2r2r1k/pb5p/1p2Q1p1/2pp2q1/8/PP1BP3/2P3PP/4RRK1 w - -", "prompt": "Starting FEN: 2r2r1k/pb5p/1p2Q1p1/2pp2q1/8/PP1BP3/2P3PP/4RRK1 w - -\nMove: e6d6\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: e6=white queen; d6=empty.\nSquares: e6 white queen->empty; d6 empty->white queen.\nRanks: rank 6 e Q->1; rank 6 d 1->Q.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "e6d6", "diagnostic": true, "hard_gate": false, "move": "e6d6"}} {"example_id": "perception_01550", "split": "perception", "task_type": "fen_assembly", "fen": "1r3rk1/5pp1/p2b1n1p/3Pq3/P7/3P1Q1P/5PP1/R1RB2K1 w - - 8 29", "prompt": "Starting FEN: 1r3rk1/5pp1/p2b1n1p/3Pq3/P7/3P1Q1P/5PP1/R1RB2K1 w - - 8 29\nMove: f3f4\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 8\nFullmove number: 29\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white queen f3f4.\nLookup: f3=white queen; f4=empty.\nSquares: f3 white queen->empty; f4 empty->white queen.\nRanks: rank 3 f Q->1; rank 4 f 1->Q.\nResult FEN: 1r3rk1/5pp1/p2b1n1p/3Pq3/P4Q2/3P3P/5PP1/R1RB2K1 b - - 9 29", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "f3f4", "diagnostic": true, "hard_gate": false, "move": "f3f4"}} {"example_id": "perception_01551", "split": "perception", "task_type": "fen_row_application", "fen": "8/8/p3bk2/1p3pp1/3K4/6P1/8/8 w - - 2 46", "prompt": "Starting FEN: 8/8/p3bk2/1p3pp1/3K4/6P1/8/8 w - - 2 46\nMove: d4c5\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 2\nFullmove number: 46\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 4 3K4->8; rank 5 1p3pp1->1pK2pp1.\nResult FEN: 8/8/p3bk2/1pK2pp1/8/6P1/8/8 b - - 3 46", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "d4c5", "_fen_row_application_rank_rewrites": [{"rank": "4", "before": "3K4", "after": "8"}, {"rank": "5", "before": "1p3pp1", "after": "1pK2pp1"}], "diagnostic": true, "hard_gate": false, "move": "d4c5", "rank_rewrites": [{"rank": "4", "before": "3K4", "after": "8"}, {"rank": "5", "before": "1p3pp1", "after": "1pK2pp1"}]}} {"example_id": "perception_01552", "split": "perception", "task_type": "state_tracking", "fen": "r1bqkb1r/pp2pppp/2np1n2/2p5/2B1P3/3P1N2/PPP2PPP/RNBQK2R w KQkq - 1 5", "prompt": "Starting FEN: r1bqkb1r/pp2pppp/2np1n2/2p5/2B1P3/3P1N2/PPP2PPP/RNBQK2R w KQkq - 1 5\nAfter the moves f3g5, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 1\nFullmove number: 5\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r1bqkb1r/pp2pppp/2np1n2/2p3N1/2B1P3/3P4/PPP2PPP/RNBQK2R b KQkq - 2 5", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "f3g5", "_state_tracking_result": "r1bqkb1r/pp2pppp/2np1n2/2p3N1/2B1P3/3P4/PPP2PPP/RNBQK2R b KQkq - 2 5"}} {"example_id": "perception_01553", "split": "perception", "task_type": "material_inventory", "fen": "r2qkbnr/1pp1pppp/3pb3/1P2n3/8/1QN5/P2PPPPP/R1B1KBNR w KQkq - 1 8", "prompt": "FEN: r2qkbnr/1pp1pppp/3pb3/1P2n3/8/1QN5/P2PPPPP/R1B1KBNR w KQkq - 1 8\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=e1; queen=b3; rook=a1,h1; bishop=c1,f1; knight=g1,c3; pawn=a2,d2,e2,f2,g2,h2,b5.\nBlack inventory: king=e8; queen=d8; rook=a8,h8; bishop=e6,f8; knight=e5,g8; pawn=d6,b7,c7,e7,f7,g7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01554", "split": "perception", "task_type": "material_piece_counts", "fen": "rnbqkbnr/ppp2ppp/8/4P3/3pP3/5Q2/PPP2PPP/RNB1KBNR b KQkq - 1 4", "prompt": "FEN: rnbqkbnr/ppp2ppp/8/4P3/3pP3/5Q2/PPP2PPP/RNB1KBNR b KQkq - 1 4\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=8.\nBlack counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01555", "split": "perception", "task_type": "material_value_totals", "fen": "rnb1k2r/ppq2ppp/2pb1n2/4p3/1P2N3/P2BPN2/1B1P1PPP/R2Q1RK1 b kq - 1 11", "prompt": "FEN: rnb1k2r/ppq2ppp/2pb1n2/4p3/1P2N3/P2BPN2/1B1P1PPP/R2Q1RK1 b kq - 1 11\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=7; total=38.\nBlack values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=7; total=38.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01556", "split": "perception", "task_type": "material_balance_trace", "fen": "1r2k2r/pB1n1p1p/5p2/1Qp5/3p1b2/6P1/4PP1P/5RK1 w k -", "prompt": "FEN: 1r2k2r/pB1n1p1p/5p2/1Qp5/3p1b2/6P1/4PP1P/5RK1 w k -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=b5; rook=f1; bishop=b7; knight=none; pawn=e2,f2,h2,g3 | black king=e8; queen=none; rook=b8,h8; bishop=f4; knight=d7; pawn=d4,c5,f6,a7,f7,h7\nCounts: white king=1; queen=1; rook=1; bishop=1; knight=0; pawn=4 | black king=1; queen=0; rook=2; bishop=1; knight=1; pawn=6\nValues: white total=21; black total=22\nBalance: Black is up 1 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01557", "split": "perception", "task_type": "multi_state_tracking", "fen": "rn1qkbnr/1pp3pp/p3pp2/2Pp1b2/3P1B2/4PN2/PP3PPP/RN1QKB1R b KQkq -", "prompt": "Starting FEN: rn1qkbnr/1pp3pp/p3pp2/2Pp1b2/3P1B2/4PN2/PP3PPP/RN1QKB1R b KQkq - 0 1\nAfter the moves f5b1 d1b3, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rn1qkbnr/1pp3pp/p3pp2/2Pp4/3P1B2/1Q2PN2/PP3PPP/Rb2KB1R b KQkq - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "f5b1 d1b3", "_multi_state_tracking_result": "rn1qkbnr/1pp3pp/p3pp2/2Pp4/3P1B2/1Q2PN2/PP3PPP/Rb2KB1R b KQkq - 1 2", "diagnostic": true, "hard_gate": false, "moves": "f5b1 d1b3"}} {"example_id": "perception_01558", "split": "perception", "task_type": "board_print", "fen": "7r/p4pk1/4p2p/4P3/1bN5/4BP2/4K1P1/2R5 w - -", "prompt": "Position (FEN): 7r/p4pk1/4p2p/4P3/1bN5/4BP2/4K1P1/2R5 w - -\nShow me the board.", "gold_answer": "8 . . . . . . . r\n7 p . . . . p k .\n6 . . . . p . . p\n5 . . . . P . . .\n4 . b N . . . . .\n3 . . . . B P . .\n2 . . . . K . P .\n1 . . R . . . . .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01559", "split": "perception", "task_type": "board_to_fen", "fen": "8/1p6/8/8/4R3/3k4/4pK2/8 b - - 0 50", "prompt": "Here is the current board:\n8 . . . . . . . .\n7 . p . . . . . .\n6 . . . . . . . .\n5 . . . . . . . .\n4 . . . . R . . .\n3 . . . k . . . .\n2 . . . . p K . .\n1 . . . . . . . .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 50\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "8/1p6/8/8/4R3/3k4/4pK2/8 b - - 0 50", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01560", "split": "perception", "task_type": "piece_id", "fen": "3r1r1k/pp4p1/2n4p/2pP1b2/2Q5/3BP3/PPN3qP/R2K1R2 b - - 1 19", "prompt": "FEN: 3r1r1k/pp4p1/2n4p/2pP1b2/2Q5/3BP3/PPN3qP/R2K1R2 b - - 1 19\nWhat piece is on d8?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black rook", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "d8"}} {"example_id": "perception_01561", "split": "perception", "task_type": "material_count", "fen": "r5r1/2p1k3/p2p1b1p/3QP3/P1P4q/4PR2/1P6/R5K1 w - - 1 28", "prompt": "FEN: r5r1/2p1k3/p2p1b1p/3QP3/P1P4q/4PR2/1P6/R5K1 w - - 1 28\nWhat is the material count for both sides?", "gold_answer": "White (9 pieces): 1 king, 5 pawns, 1 queen, 2 rooks. Black (9 pieces): 1 bishop, 1 king, 4 pawns, 1 queen, 2 rooks. Black is up 2 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01562", "split": "perception", "task_type": "square_lookup", "fen": "8/8/1k2B3/1N6/1K6/8/8/8 w - -", "prompt": "FEN: 8/8/1k2B3/1N6/1K6/8/8/8 w - -\nWhat is on e6?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "e6=white bishop", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "e6", "diagnostic": true, "hard_gate": false, "square": "e6"}} {"example_id": "perception_01563", "split": "perception", "task_type": "rank_lookup", "fen": "1B5k/1pp3p1/5p1p/3P4/1P2b1r1/P1P5/6BP/6K1 w - - 2 32", "prompt": "FEN: 1B5k/1pp3p1/5p1p/3P4/1P2b1r1/P1P5/6BP/6K1 w - - 2 32\nWhat is the compressed FEN row for rank 3?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 3: P1P5", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "3", "_rank_lookup_row": "P1P5", "diagnostic": true, "hard_gate": false, "rank": "3", "fen_rank_row": "P1P5"}} {"example_id": "perception_01564", "split": "perception", "task_type": "square_coordinates", "fen": "rn3rk1/3bppbp/p2p1np1/2pP4/4P3/1PN5/1P1N1PPP/R1B1KB1R w KQ -", "prompt": "FEN: rn3rk1/3bppbp/p2p1np1/2pP4/4P3/1PN5/1P1N1PPP/R1B1KB1R w KQ -\nFor square f8, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "f8: file=f; rank=8; fen_row_from_top=1; file_index=6", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "f8", "diagnostic": true, "hard_gate": false, "square": "f8"}} {"example_id": "perception_01565", "split": "perception", "task_type": "fen_rank_expansion", "fen": "rn1qkbnr/ppp2pp1/4p2p/3p1b2/8/1P1P1N2/PBP1PPPP/RN1QKB1R w KQkq -", "prompt": "FEN: rn1qkbnr/ppp2pp1/4p2p/3p1b2/8/1P1P1N2/PBP1PPPP/RN1QKB1R w KQkq -\nCompressed rank 3 row: 1P1P1N2\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 3: a=1; b=P; c=1; d=P; e=1; f=N; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "3", "_fen_rank_expansion_row": "1P1P1N2", "diagnostic": true, "hard_gate": false, "rank": "3", "fen_rank_row": "1P1P1N2"}} {"example_id": "perception_01566", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r1b2rk1/ppp2pbp/5np1/2q5/4PB2/2NB4/PPP3PP/R2Q1R1K w - -", "prompt": "Rank 1 row before: R2Q1R1K\nFile d changes from Q to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 1: R2Q1R1K -> R1Q2R1K", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "d1c1", "_fen_rank_cell_edit_square": "d1", "_fen_rank_cell_edit_rank": "1", "_fen_rank_cell_edit_file": "d", "_fen_rank_cell_edit_before_row": "R2Q1R1K", "_fen_rank_cell_edit_after_row": "R1Q2R1K", "_fen_rank_cell_edit_before_fen": "Q", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "d1c1", "square": "d1", "rank": "1", "file": "d", "before_row": "R2Q1R1K", "after_row": "R1Q2R1K", "before_fen": "Q", "after_fen": "1"}} {"example_id": "perception_01567", "split": "perception", "task_type": "fen_board_edit", "fen": "rn6/1p1kq1p1/p2p1nQ1/2pPpP2/2P3P1/8/PP2N3/R4RK1 w - - 3 26", "prompt": "Board FEN before: rn6/1p1kq1p1/p2p1nQ1/2pPpP2/2P3P1/8/PP2N3/R4RK1\nApply square edits: a1 R->1; c1 1->R\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: rn6/1p1kq1p1/p2p1nQ1/2pPpP2/2P3P1/8/PP2N3/2R2RK1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "a1c1", "_fen_board_edit_board_fen_before": "rn6/1p1kq1p1/p2p1nQ1/2pPpP2/2P3P1/8/PP2N3/R4RK1", "_fen_board_edit_board_fen_after": "rn6/1p1kq1p1/p2p1nQ1/2pPpP2/2P3P1/8/PP2N3/2R2RK1", "_fen_board_edit_edit_text": "a1 R->1; c1 1->R", "_fen_board_edit_changed_squares": [{"square": "a1", "before": "white rook", "after": "empty", "before_fen": "R", "after_fen": "1"}, {"square": "c1", "before": "empty", "after": "white rook", "before_fen": "1", "after_fen": "R"}], "diagnostic": true, "hard_gate": false, "move": "a1c1", "board_fen_before": "rn6/1p1kq1p1/p2p1nQ1/2pPpP2/2P3P1/8/PP2N3/R4RK1", "board_fen_after": "rn6/1p1kq1p1/p2p1nQ1/2pPpP2/2P3P1/8/PP2N3/2R2RK1", "edit_text": "a1 R->1; c1 1->R", "changed_squares": [{"square": "a1", "before": "white rook", "after": "empty", "before_fen": "R", "after_fen": "1"}, {"square": "c1", "before": "empty", "after": "white rook", "before_fen": "1", "after_fen": "R"}]}} {"example_id": "perception_01568", "split": "perception", "task_type": "move_square_edits", "fen": "2k5/3R4/1PB5/P7/6p1/6P1/5PK1/8 w - -", "prompt": "Starting FEN: 2k5/3R4/1PB5/P7/6p1/6P1/5PK1/8 w - -\nMove: d7d3\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: d7=white rook; d3=empty.\nSquares: d7 white rook->empty; d3 empty->white rook.\nRanks: rank 7 d R->1; rank 3 d 1->R.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "d7d3", "diagnostic": true, "hard_gate": false, "move": "d7d3"}} {"example_id": "perception_01569", "split": "perception", "task_type": "fen_assembly", "fen": "r1b1k2r/pp1p1ppp/n4n2/8/1b6/6Q1/PPqPNPPP/RNB1KB1R w KQkq - 0 8", "prompt": "Starting FEN: r1b1k2r/pp1p1ppp/n4n2/8/1b6/6Q1/PPqPNPPP/RNB1KB1R w KQkq - 0 8\nMove: h1g1\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 8\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white rook h1g1.\nLookup: h1=white rook; g1=empty.\nSquares: h1 white rook->empty; g1 empty->white rook.\nRanks: rank 1 h R->1; rank 1 g 1->R.\nResult FEN: r1b1k2r/pp1p1ppp/n4n2/8/1b6/6Q1/PPqPNPPP/RNB1KBR1 b Qkq - 1 8", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "h1g1", "diagnostic": true, "hard_gate": false, "move": "h1g1"}} {"example_id": "perception_01570", "split": "perception", "task_type": "fen_row_application", "fen": "k2r4/pp5p/4R3/2p5/8/7P/5PP1/6K1 w - - 0 31", "prompt": "Starting FEN: k2r4/pp5p/4R3/2p5/8/7P/5PP1/6K1 w - - 0 31\nMove: e6b6\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 31\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 6 4R3->1R6.\nResult FEN: k2r4/pp5p/1R6/2p5/8/7P/5PP1/6K1 b - - 1 31", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "e6b6", "_fen_row_application_rank_rewrites": [{"rank": "6", "before": "4R3", "after": "1R6"}], "diagnostic": true, "hard_gate": false, "move": "e6b6", "rank_rewrites": [{"rank": "6", "before": "4R3", "after": "1R6"}]}} {"example_id": "perception_01571", "split": "perception", "task_type": "state_tracking", "fen": "r1bqk2r/pp2bpp1/2np1n1p/1Bp1p3/4P3/2P2N1P/PP1P1PP1/RNBQ1RK1 w kq -", "prompt": "Starting FEN: r1bqk2r/pp2bpp1/2np1n1p/1Bp1p3/4P3/2P2N1P/PP1P1PP1/RNBQ1RK1 w kq - 0 1\nAfter the moves d1e1, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: kq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r1bqk2r/pp2bpp1/2np1n1p/1Bp1p3/4P3/2P2N1P/PP1P1PP1/RNB1QRK1 b kq - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "d1e1", "_state_tracking_result": "r1bqk2r/pp2bpp1/2np1n1p/1Bp1p3/4P3/2P2N1P/PP1P1PP1/RNB1QRK1 b kq - 1 1"}} {"example_id": "perception_01572", "split": "perception", "task_type": "material_inventory", "fen": "1R6/1p3k2/p1b5/P1P5/4r3/8/1K4pp/8 w - - 0 49", "prompt": "FEN: 1R6/1p3k2/p1b5/P1P5/4r3/8/1K4pp/8 w - - 0 49\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=b2; queen=none; rook=b8; bishop=none; knight=none; pawn=a5,c5.\nBlack inventory: king=f7; queen=none; rook=e4; bishop=c6; knight=none; pawn=g2,h2,a6,b7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01573", "split": "perception", "task_type": "material_piece_counts", "fen": "8/8/1p4p1/1P1p3p/1P1Pp2k/8/5K2/8 w - - 0 51", "prompt": "FEN: 8/8/1p4p1/1P1p3p/1P1Pp2k/8/5K2/8 w - - 0 51\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=0; bishop=0; knight=0; pawn=3.\nBlack counts: king=1; queen=0; rook=0; bishop=0; knight=0; pawn=5.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01574", "split": "perception", "task_type": "material_value_totals", "fen": "b6r/2kn3p/2pq4/1p1p1Q2/4pP2/1PN3P1/2PP1P1P/2B2RK1 w - - 1 21", "prompt": "FEN: b6r/2kn3p/2pq4/1p1p1Q2/4pP2/1PN3P1/2PP1P1P/2B2RK1 w - - 1 21\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=5; bishop=3; knight=3; pawn=7; total=27.\nBlack values: king=0; queen=9; rook=5; bishop=3; knight=3; pawn=5; total=25.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01575", "split": "perception", "task_type": "material_balance_trace", "fen": "r6r/p3bkpp/npp1bpn1/8/5p2/P1N2N2/1BPP2PP/R3K2R w - -", "prompt": "FEN: r6r/p3bkpp/npp1bpn1/8/5p2/P1N2N2/1BPP2PP/R3K2R w - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=e1; queen=none; rook=a1,h1; bishop=b2; knight=c3,f3; pawn=c2,d2,g2,h2,a3 | black king=f7; queen=none; rook=a8,h8; bishop=e6,e7; knight=a6,g6; pawn=f4,b6,c6,f6,a7,g7,h7\nCounts: white king=1; queen=0; rook=2; bishop=1; knight=2; pawn=5 | black king=1; queen=0; rook=2; bishop=2; knight=2; pawn=7\nValues: white total=24; black total=29\nBalance: Black is up 5 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01576", "split": "perception", "task_type": "multi_state_tracking", "fen": "8/1k6/2R5/1K6/7r/P7/1P6/8 w - - 17 59", "prompt": "Starting FEN: 8/1k6/2R5/1K6/7r/P7/1P6/8 w - - 17 59\nAfter the moves b5c5 h4g4 c6a6, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 17\nFullmove number: 59\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 8/1k6/R7/2K5/6r1/P7/1P6/8 b - - 20 60", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "b5c5 h4g4 c6a6", "_multi_state_tracking_result": "8/1k6/R7/2K5/6r1/P7/1P6/8 b - - 20 60", "diagnostic": true, "hard_gate": false, "moves": "b5c5 h4g4 c6a6"}} {"example_id": "perception_01577", "split": "perception", "task_type": "board_print", "fen": "6k1/Q4pp1/5n1p/3N4/1rq1P3/7P/6P1/R4R1K b - - 1 38", "prompt": "Position (FEN): 6k1/Q4pp1/5n1p/3N4/1rq1P3/7P/6P1/R4R1K b - - 1 38\nShow me the board.", "gold_answer": "8 . . . . . . k .\n7 Q . . . . p p .\n6 . . . . . n . p\n5 . . . N . . . .\n4 . r q . P . . .\n3 . . . . . . . P\n2 . . . . . . P .\n1 R . . . . R . K\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01578", "split": "perception", "task_type": "board_to_fen", "fen": "r3k2r/pp3ppp/1q3n2/2bp4/1n4b1/1NNQB1P1/PPP2PBP/R3K2R w KQkq -", "prompt": "Here is the current board:\n8 r . . . k . . r\n7 p p . . . p p p\n6 . q . . . n . .\n5 . . b p . . . .\n4 . n . . . . b .\n3 . N N Q B . P .\n2 P P P . . P B P\n1 R . . . K . . R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r3k2r/pp3ppp/1q3n2/2bp4/1n4b1/1NNQB1P1/PPP2PBP/R3K2R w KQkq - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01579", "split": "perception", "task_type": "piece_id", "fen": "2k2r2/pbpp4/1p2p2P/4Pn2/2P1NR1n/1P1B3P/P2r4/R6K b - - 1 24", "prompt": "FEN: 2k2r2/pbpp4/1p2p2P/4Pn2/2P1NR1n/1P1B3P/P2r4/R6K b - - 1 24\nWhat piece is on c4?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "c4"}} {"example_id": "perception_01580", "split": "perception", "task_type": "material_count", "fen": "8/2p3pp/2p5/p3p3/2k1K1P1/P7/7P/8 w - - 0 29", "prompt": "FEN: 8/2p3pp/2p5/p3p3/2k1K1P1/P7/7P/8 w - - 0 29\nWhat is the material count for both sides?", "gold_answer": "White (4 pieces): 1 king, 3 pawns. Black (7 pieces): 1 king, 6 pawns. Black is up 3 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01581", "split": "perception", "task_type": "square_lookup", "fen": "8/p1p2p2/5k2/8/2PnB1r1/P4PPp/1P5P/5RK1 b - - 0 32", "prompt": "FEN: 8/p1p2p2/5k2/8/2PnB1r1/P4PPp/1P5P/5RK1 b - - 0 32\nWhat is on f7?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "f7=black pawn", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "f7", "diagnostic": true, "hard_gate": false, "square": "f7"}} {"example_id": "perception_01582", "split": "perception", "task_type": "rank_lookup", "fen": "r3kb1r/pp2pppp/1qnp1n2/5b2/3P1B2/2N1P3/PPQ2PPP/R3KBNR w KQkq -", "prompt": "FEN: r3kb1r/pp2pppp/1qnp1n2/5b2/3P1B2/2N1P3/PPQ2PPP/R3KBNR w KQkq -\nWhat is the compressed FEN row for rank 4?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 4: 3P1B2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "4", "_rank_lookup_row": "3P1B2", "diagnostic": true, "hard_gate": false, "rank": "4", "fen_rank_row": "3P1B2"}} {"example_id": "perception_01583", "split": "perception", "task_type": "square_coordinates", "fen": "rnbqkb1r/p4p1p/2pp1pp1/6B1/3P4/2Q5/PPP2PPP/2KR1BNR w kq -", "prompt": "FEN: rnbqkb1r/p4p1p/2pp1pp1/6B1/3P4/2Q5/PPP2PPP/2KR1BNR w kq -\nFor square a7, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "a7: file=a; rank=7; fen_row_from_top=2; file_index=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "a7", "diagnostic": true, "hard_gate": false, "square": "a7"}} {"example_id": "perception_01584", "split": "perception", "task_type": "fen_rank_expansion", "fen": "rnbq1rk1/ppp2pbp/3p1np1/4p3/3PPP2/2PB4/PP2N1PP/RNBQ1RK1 b - -", "prompt": "FEN: rnbq1rk1/ppp2pbp/3p1np1/4p3/3PPP2/2PB4/PP2N1PP/RNBQ1RK1 b - -\nCompressed rank 8 row: rnbq1rk1\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 8: a=r; b=n; c=b; d=q; e=1; f=r; g=k; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "8", "_fen_rank_expansion_row": "rnbq1rk1", "diagnostic": true, "hard_gate": false, "rank": "8", "fen_rank_row": "rnbq1rk1"}} {"example_id": "perception_01585", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "8/7P/p4k1P/5p2/3p4/3K4/P7/8 b - -", "prompt": "Rank 4 row before: 3p4\nFile f changes from 1 to p. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 4: 3p4 -> 3p1p2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "f5f4", "_fen_rank_cell_edit_square": "f4", "_fen_rank_cell_edit_rank": "4", "_fen_rank_cell_edit_file": "f", "_fen_rank_cell_edit_before_row": "3p4", "_fen_rank_cell_edit_after_row": "3p1p2", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "p", "diagnostic": true, "hard_gate": false, "move": "f5f4", "square": "f4", "rank": "4", "file": "f", "before_row": "3p4", "after_row": "3p1p2", "before_fen": "1", "after_fen": "p"}} {"example_id": "perception_01586", "split": "perception", "task_type": "fen_board_edit", "fen": "r1b1kb1r/p1qn1ppp/2p1pn2/1p6/2BP4/2N2N2/PPPBQPPP/2KR3R w kq -", "prompt": "Board FEN before: r1b1kb1r/p1qn1ppp/2p1pn2/1p6/2BP4/2N2N2/PPPBQPPP/2KR3R\nApply square edits: d2 B->1; f4 1->B\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: r1b1kb1r/p1qn1ppp/2p1pn2/1p6/2BP1B2/2N2N2/PPP1QPPP/2KR3R", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "d2f4", "_fen_board_edit_board_fen_before": "r1b1kb1r/p1qn1ppp/2p1pn2/1p6/2BP4/2N2N2/PPPBQPPP/2KR3R", "_fen_board_edit_board_fen_after": "r1b1kb1r/p1qn1ppp/2p1pn2/1p6/2BP1B2/2N2N2/PPP1QPPP/2KR3R", "_fen_board_edit_edit_text": "d2 B->1; f4 1->B", "_fen_board_edit_changed_squares": [{"square": "d2", "before": "white bishop", "after": "empty", "before_fen": "B", "after_fen": "1"}, {"square": "f4", "before": "empty", "after": "white bishop", "before_fen": "1", "after_fen": "B"}], "diagnostic": true, "hard_gate": false, "move": "d2f4", "board_fen_before": "r1b1kb1r/p1qn1ppp/2p1pn2/1p6/2BP4/2N2N2/PPPBQPPP/2KR3R", "board_fen_after": "r1b1kb1r/p1qn1ppp/2p1pn2/1p6/2BP1B2/2N2N2/PPP1QPPP/2KR3R", "edit_text": "d2 B->1; f4 1->B", "changed_squares": [{"square": "d2", "before": "white bishop", "after": "empty", "before_fen": "B", "after_fen": "1"}, {"square": "f4", "before": "empty", "after": "white bishop", "before_fen": "1", "after_fen": "B"}]}} {"example_id": "perception_01587", "split": "perception", "task_type": "move_square_edits", "fen": "1r3rk1/1b3ppp/p1n1pb2/8/1PB5/P4N1P/R4PP1/3R2K1 b - - 0 19", "prompt": "Starting FEN: 1r3rk1/1b3ppp/p1n1pb2/8/1PB5/P4N1P/R4PP1/3R2K1 b - - 0 19\nMove: h7h6\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: h7=black pawn; h6=empty.\nSquares: h7 black pawn->empty; h6 empty->black pawn.\nRanks: rank 7 h p->1; rank 6 h 1->p.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "h7h6", "diagnostic": true, "hard_gate": false, "move": "h7h6"}} {"example_id": "perception_01588", "split": "perception", "task_type": "fen_assembly", "fen": "8/2p4k/6p1/P6p/4Q3/8/1PP5/1K3q2 w - - 1 37", "prompt": "Starting FEN: 8/2p4k/6p1/P6p/4Q3/8/1PP5/1K3q2 w - - 1 37\nMove: b1a2\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 37\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white king b1a2.\nLookup: b1=white king; a2=empty.\nSquares: b1 white king->empty; a2 empty->white king.\nRanks: rank 1 b K->1; rank 2 a 1->K.\nResult FEN: 8/2p4k/6p1/P6p/4Q3/8/KPP5/5q2 b - - 2 37", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "b1a2", "diagnostic": true, "hard_gate": false, "move": "b1a2"}} {"example_id": "perception_01589", "split": "perception", "task_type": "fen_row_application", "fen": "8/8/2k5/Q4K2/8/8/8/7R w - -", "prompt": "Starting FEN: 8/8/2k5/Q4K2/8/8/8/7R w - - 0 1\nMove: a5b6\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 5 Q4K2->5K2; rank 6 2k5->1Qk5.\nResult FEN: 8/8/1Qk5/5K2/8/8/8/7R b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "a5b6", "_fen_row_application_rank_rewrites": [{"rank": "5", "before": "Q4K2", "after": "5K2"}, {"rank": "6", "before": "2k5", "after": "1Qk5"}], "diagnostic": true, "hard_gate": false, "move": "a5b6", "rank_rewrites": [{"rank": "5", "before": "Q4K2", "after": "5K2"}, {"rank": "6", "before": "2k5", "after": "1Qk5"}]}} {"example_id": "perception_01590", "split": "perception", "task_type": "state_tracking", "fen": "rn2kbnr/pbppqppp/1p2p3/8/3PPP2/2NB4/PPP3PP/R1BQK1NR b KQkq - 0 5", "prompt": "Starting FEN: rn2kbnr/pbppqppp/1p2p3/8/3PPP2/2NB4/PPP3PP/R1BQK1NR b KQkq - 0 5\nAfter the moves b7d5, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 5\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rn2kbnr/p1ppqppp/1p2p3/3b4/3PPP2/2NB4/PPP3PP/R1BQK1NR w KQkq - 1 6", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "b7d5", "_state_tracking_result": "rn2kbnr/p1ppqppp/1p2p3/3b4/3PPP2/2NB4/PPP3PP/R1BQK1NR w KQkq - 1 6"}} {"example_id": "perception_01591", "split": "perception", "task_type": "material_inventory", "fen": "4rr1k/1b1q1p2/p1n3Q1/1p5p/3p1B2/PB1P3P/1PP3P1/R3R1K1 w - - 1 21", "prompt": "FEN: 4rr1k/1b1q1p2/p1n3Q1/1p5p/3p1B2/PB1P3P/1PP3P1/R3R1K1 w - - 1 21\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=g6; rook=a1,e1; bishop=b3,f4; knight=none; pawn=b2,c2,g2,a3,d3,h3.\nBlack inventory: king=h8; queen=d7; rook=e8,f8; bishop=b7; knight=c6; pawn=d4,b5,h5,a6,f7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01592", "split": "perception", "task_type": "material_piece_counts", "fen": "rn1qkb1r/pp3ppp/2p1pnb1/3p4/3P1B1P/2NBPN2/PPP2PP1/R2QK2R b KQkq -", "prompt": "FEN: rn1qkb1r/pp3ppp/2p1pnb1/3p4/3P1B1P/2NBPN2/PPP2PP1/R2QK2R b KQkq -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=8.\nBlack counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=8.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01593", "split": "perception", "task_type": "material_value_totals", "fen": "1k5r/ppp5/2n2p1p/5B2/1b6/5P1N/1q1pQKPP/R6R b - - 2 27", "prompt": "FEN: 1k5r/ppp5/2n2p1p/5B2/1b6/5P1N/1q1pQKPP/R6R b - - 2 27\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=3; knight=3; pawn=3; total=28.\nBlack values: king=0; queen=9; rook=5; bishop=3; knight=3; pawn=6; total=26.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01594", "split": "perception", "task_type": "material_balance_trace", "fen": "r1b3k1/1p3pp1/p2b4/2r4p/2N2N2/2P3PP/P4P2/R4K1R w - - 1 24", "prompt": "FEN: r1b3k1/1p3pp1/p2b4/2r4p/2N2N2/2P3PP/P4P2/R4K1R w - - 1 24\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=f1; queen=none; rook=a1,h1; bishop=none; knight=c4,f4; pawn=a2,f2,c3,g3,h3 | black king=g8; queen=none; rook=c5,a8; bishop=d6,c8; knight=none; pawn=h5,a6,b7,f7,g7\nCounts: white king=1; queen=0; rook=2; bishop=0; knight=2; pawn=5 | black king=1; queen=0; rook=2; bishop=2; knight=0; pawn=5\nValues: white total=21; black total=21\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01595", "split": "perception", "task_type": "multi_state_tracking", "fen": "8/4n1p1/4k2p/p2np3/2B5/PN4P1/1P2KP1P/8 w - - 6 36", "prompt": "Starting FEN: 8/4n1p1/4k2p/p2np3/2B5/PN4P1/1P2KP1P/8 w - - 6 36\nAfter the moves h2h4 e6f6, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 6\nFullmove number: 36\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 8/4n1p1/5k1p/p2np3/2B4P/PN4P1/1P2KP2/8 w - - 1 37", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "h2h4 e6f6", "_multi_state_tracking_result": "8/4n1p1/5k1p/p2np3/2B4P/PN4P1/1P2KP2/8 w - - 1 37", "diagnostic": true, "hard_gate": false, "moves": "h2h4 e6f6"}} {"example_id": "perception_01596", "split": "perception", "task_type": "board_print", "fen": "rnbq1rk1/ppp2pp1/3bpn1p/3p4/3P1B2/2NBPQ1N/PPP2PPP/R3K2R b KQ -", "prompt": "Position (FEN): rnbq1rk1/ppp2pp1/3bpn1p/3p4/3P1B2/2NBPQ1N/PPP2PPP/R3K2R b KQ -\nShow me the board.", "gold_answer": "8 r n b q . r k .\n7 p p p . . p p .\n6 . . . b p n . p\n5 . . . p . . . .\n4 . . . P . B . .\n3 . . N B P Q . N\n2 P P P . . P P P\n1 R . . . K . . R\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01597", "split": "perception", "task_type": "board_to_fen", "fen": "5nk1/6p1/1Q2pq1p/8/4B3/4P1P1/5P1P/6K1 w - -", "prompt": "Here is the current board:\n8 . . . . . n k .\n7 . . . . . . p .\n6 . Q . . p q . p\n5 . . . . . . . .\n4 . . . . B . . .\n3 . . . . P . P .\n2 . . . . . P . P\n1 . . . . . . K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "5nk1/6p1/1Q2pq1p/8/4B3/4P1P1/5P1P/6K1 w - - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01598", "split": "perception", "task_type": "piece_id", "fen": "rn2k2r/2p1qpp1/1p2p2p/p1bN4/8/P2P1Q1N/1PP2PPP/R1BR2K1 b kq - 0 12", "prompt": "FEN: rn2k2r/2p1qpp1/1p2p2p/p1bN4/8/P2P1Q1N/1PP2PPP/R1BR2K1 b kq - 0 12\nWhat piece is on f3?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white queen", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "f3"}} {"example_id": "perception_01599", "split": "perception", "task_type": "material_count", "fen": "3qk2r/1pp3pp/1pn1bp2/4p3/4PP2/r1PP2P1/P3N1BP/R2Q1RK1 b k - 0 13", "prompt": "FEN: 3qk2r/1pp3pp/1pn1bp2/4p3/4PP2/r1PP2P1/P3N1BP/R2Q1RK1 b k - 0 13\nWhat is the material count for both sides?", "gold_answer": "White (13 pieces): 1 bishop, 1 king, 1 knight, 7 pawns, 1 queen, 2 rooks. Black (13 pieces): 1 bishop, 1 king, 1 knight, 7 pawns, 1 queen, 2 rooks. Material is equal.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01600", "split": "perception", "task_type": "square_lookup", "fen": "2kr4/pq1n4/4pr2/1pp5/2p3Q1/2N3P1/PP3P1P/R3R1K1 b - -", "prompt": "FEN: 2kr4/pq1n4/4pr2/1pp5/2p3Q1/2N3P1/PP3P1P/R3R1K1 b - -\nWhat is on d2?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "d2=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "d2", "diagnostic": true, "hard_gate": false, "square": "d2"}} {"example_id": "perception_01601", "split": "perception", "task_type": "rank_lookup", "fen": "8/8/pr3k2/4p3/4K3/8/P2R1P2/8 w - - 7 37", "prompt": "FEN: 8/8/pr3k2/4p3/4K3/8/P2R1P2/8 w - - 7 37\nWhat is the compressed FEN row for rank 2?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 2: P2R1P2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "2", "_rank_lookup_row": "P2R1P2", "diagnostic": true, "hard_gate": false, "rank": "2", "fen_rank_row": "P2R1P2"}} {"example_id": "perception_01602", "split": "perception", "task_type": "square_coordinates", "fen": "rnbq1rk1/p3ppbp/2p2np1/8/3PpP2/7N/PPP2BPP/RN1QK2R w KQ - 2 9", "prompt": "FEN: rnbq1rk1/p3ppbp/2p2np1/8/3PpP2/7N/PPP2BPP/RN1QK2R w KQ - 2 9\nFor square b8, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "b8: file=b; rank=8; fen_row_from_top=1; file_index=2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "b8", "diagnostic": true, "hard_gate": false, "square": "b8"}} {"example_id": "perception_01603", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r1bq1r2/ppppbkpp/2n1N3/8/3P4/2P5/P1P3PP/R1BQ1RK1 b - -", "prompt": "FEN: r1bq1r2/ppppbkpp/2n1N3/8/3P4/2P5/P1P3PP/R1BQ1RK1 b - -\nCompressed rank 3 row: 2P5\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 3: a=1; b=1; c=P; d=1; e=1; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "3", "_fen_rank_expansion_row": "2P5", "diagnostic": true, "hard_gate": false, "rank": "3", "fen_rank_row": "2P5"}} {"example_id": "perception_01604", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r3r3/pb3k1p/8/1p3p2/2pp1Q2/2P5/PP3PPP/R5K1 w - - 0 28", "prompt": "Rank 1 row before: R5K1\nFile f changes from 1 to K. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 1: R5K1 -> R4K2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "g1f1", "_fen_rank_cell_edit_square": "f1", "_fen_rank_cell_edit_rank": "1", "_fen_rank_cell_edit_file": "f", "_fen_rank_cell_edit_before_row": "R5K1", "_fen_rank_cell_edit_after_row": "R4K2", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "K", "diagnostic": true, "hard_gate": false, "move": "g1f1", "square": "f1", "rank": "1", "file": "f", "before_row": "R5K1", "after_row": "R4K2", "before_fen": "1", "after_fen": "K"}} {"example_id": "perception_01605", "split": "perception", "task_type": "fen_board_edit", "fen": "8/8/8/1k1b4/8/R7/6p1/4b1K1 b - -", "prompt": "Board FEN before: 8/8/8/1k1b4/8/R7/6p1/4b1K1\nApply square edits: e1 b->1; a5 1->b\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 8/8/8/bk1b4/8/R7/6p1/6K1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "e1a5", "_fen_board_edit_board_fen_before": "8/8/8/1k1b4/8/R7/6p1/4b1K1", "_fen_board_edit_board_fen_after": "8/8/8/bk1b4/8/R7/6p1/6K1", "_fen_board_edit_edit_text": "e1 b->1; a5 1->b", "_fen_board_edit_changed_squares": [{"square": "e1", "before": "black bishop", "after": "empty", "before_fen": "b", "after_fen": "1"}, {"square": "a5", "before": "empty", "after": "black bishop", "before_fen": "1", "after_fen": "b"}], "diagnostic": true, "hard_gate": false, "move": "e1a5", "board_fen_before": "8/8/8/1k1b4/8/R7/6p1/4b1K1", "board_fen_after": "8/8/8/bk1b4/8/R7/6p1/6K1", "edit_text": "e1 b->1; a5 1->b", "changed_squares": [{"square": "e1", "before": "black bishop", "after": "empty", "before_fen": "b", "after_fen": "1"}, {"square": "a5", "before": "empty", "after": "black bishop", "before_fen": "1", "after_fen": "b"}]}} {"example_id": "perception_01606", "split": "perception", "task_type": "move_square_edits", "fen": "1r3rk1/pb1pnppp/2nN1q2/2p1p3/4P3/3Q1B2/PPP2PPP/R1B2RK1 w - - 4 14", "prompt": "Starting FEN: 1r3rk1/pb1pnppp/2nN1q2/2p1p3/4P3/3Q1B2/PPP2PPP/R1B2RK1 w - - 4 14\nMove: f3e2\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: f3=white bishop; e2=empty.\nSquares: f3 white bishop->empty; e2 empty->white bishop.\nRanks: rank 3 f B->1; rank 2 e 1->B.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "f3e2", "diagnostic": true, "hard_gate": false, "move": "f3e2"}} {"example_id": "perception_01607", "split": "perception", "task_type": "fen_assembly", "fen": "r3kbnr/1ppb1ppp/p7/n2NP3/P1p2P2/8/1P1BP1PP/R2K1BNR b kq -", "prompt": "Starting FEN: r3kbnr/1ppb1ppp/p7/n2NP3/P1p2P2/8/1P1BP1PP/R2K1BNR b kq - 0 1\nMove: c7c6\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: kq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black pawn c7c6.\nLookup: c7=black pawn; c6=empty.\nSquares: c7 black pawn->empty; c6 empty->black pawn.\nRanks: rank 7 c p->1; rank 6 c 1->p.\nResult FEN: r3kbnr/1p1b1ppp/p1p5/n2NP3/P1p2P2/8/1P1BP1PP/R2K1BNR w kq - 0 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "c7c6", "diagnostic": true, "hard_gate": false, "move": "c7c6"}} {"example_id": "perception_01608", "split": "perception", "task_type": "fen_row_application", "fen": "r2q1rk1/ppp1bp1p/2n1b2p/3pp3/3PPnP1/2P2N1P/PP3P1Q/RN2KB1R b KQ - 0 12", "prompt": "Starting FEN: r2q1rk1/ppp1bp1p/2n1b2p/3pp3/3PPnP1/2P2N1P/PP3P1Q/RN2KB1R b KQ - 0 12\nMove: d8b8\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 0\nFullmove number: 12\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 8 r2q1rk1->rq3rk1.\nResult FEN: rq3rk1/ppp1bp1p/2n1b2p/3pp3/3PPnP1/2P2N1P/PP3P1Q/RN2KB1R w KQ - 1 13", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "d8b8", "_fen_row_application_rank_rewrites": [{"rank": "8", "before": "r2q1rk1", "after": "rq3rk1"}], "diagnostic": true, "hard_gate": false, "move": "d8b8", "rank_rewrites": [{"rank": "8", "before": "r2q1rk1", "after": "rq3rk1"}]}} {"example_id": "perception_01609", "split": "perception", "task_type": "state_tracking", "fen": "r3r1k1/5p1p/1R1p2pb/p7/2p3K1/8/P4PPP/7R b - - 1 26", "prompt": "Starting FEN: r3r1k1/5p1p/1R1p2pb/p7/2p3K1/8/P4PPP/7R b - - 1 26\nAfter the moves d6d5, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 26\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r3r1k1/5p1p/1R4pb/p2p4/2p3K1/8/P4PPP/7R w - - 0 27", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "d6d5", "_state_tracking_result": "r3r1k1/5p1p/1R4pb/p2p4/2p3K1/8/P4PPP/7R w - - 0 27"}} {"example_id": "perception_01610", "split": "perception", "task_type": "material_inventory", "fen": "r2q1rk1/pppb1pb1/n3p1pp/3pPn2/2PP4/1B3Q1N/PP3PPP/RNB2RK1 b - - 0 11", "prompt": "FEN: r2q1rk1/pppb1pb1/n3p1pp/3pPn2/2PP4/1B3Q1N/PP3PPP/RNB2RK1 b - - 0 11\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=f3; rook=a1,f1; bishop=c1,b3; knight=b1,h3; pawn=a2,b2,f2,g2,h2,c4,d4,e5.\nBlack inventory: king=g8; queen=d8; rook=a8,f8; bishop=d7,g7; knight=f5,a6; pawn=d5,e6,g6,h6,a7,b7,c7,f7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01611", "split": "perception", "task_type": "material_piece_counts", "fen": "r4rk1/pp3p1p/2n2bp1/5b2/2N5/4P2P/PP2BPP1/R1BqR1K1 w - - 0 17", "prompt": "FEN: r4rk1/pp3p1p/2n2bp1/5b2/2N5/4P2P/PP2BPP1/R1BqR1K1 w - - 0 17\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=2; bishop=2; knight=1; pawn=6.\nBlack counts: king=1; queen=1; rook=2; bishop=2; knight=1; pawn=5.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01612", "split": "perception", "task_type": "material_value_totals", "fen": "1k6/8/2K5/2Q5/8/8/8/5B2 w - -", "prompt": "FEN: 1k6/8/2K5/2Q5/8/8/8/5B2 w - -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=0; bishop=3; knight=0; pawn=0; total=12.\nBlack values: king=0; queen=0; rook=0; bishop=0; knight=0; pawn=0; total=0.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01613", "split": "perception", "task_type": "material_balance_trace", "fen": "r2qkb1r/pb4pp/4p3/1Pp1n2Q/3pN3/7P/PP3PP1/R1B1KB1R b KQkq -", "prompt": "FEN: r2qkb1r/pb4pp/4p3/1Pp1n2Q/3pN3/7P/PP3PP1/R1B1KB1R b KQkq -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=e1; queen=h5; rook=a1,h1; bishop=c1,f1; knight=e4; pawn=a2,b2,f2,g2,h3,b5 | black king=e8; queen=d8; rook=a8,h8; bishop=b7,f8; knight=e5; pawn=d4,c5,e6,a7,g7,h7\nCounts: white king=1; queen=1; rook=2; bishop=2; knight=1; pawn=6 | black king=1; queen=1; rook=2; bishop=2; knight=1; pawn=6\nValues: white total=34; black total=34\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01614", "split": "perception", "task_type": "multi_state_tracking", "fen": "r1b1k2r/pp3ppp/n1p4B/8/6n1/P1N2NP1/1PP1B2P/2KR1R2 b kq - 0 19", "prompt": "Starting FEN: r1b1k2r/pp3ppp/n1p4B/8/6n1/P1N2NP1/1PP1B2P/2KR1R2 b kq - 0 19\nAfter the moves h8g8 d1d8 e8d8, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: kq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 19\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r1bk2r1/pp3ppp/n1p4B/8/6n1/P1N2NP1/1PP1B2P/2K2R2 w - - 0 21", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "h8g8 d1d8 e8d8", "_multi_state_tracking_result": "r1bk2r1/pp3ppp/n1p4B/8/6n1/P1N2NP1/1PP1B2P/2K2R2 w - - 0 21", "diagnostic": true, "hard_gate": false, "moves": "h8g8 d1d8 e8d8"}} {"example_id": "perception_01615", "split": "perception", "task_type": "board_print", "fen": "r3qrk1/5pp1/4p2p/pN1p4/4n3/P3P2P/5PP1/1RB1QRK1 w - - 1 21", "prompt": "Position (FEN): r3qrk1/5pp1/4p2p/pN1p4/4n3/P3P2P/5PP1/1RB1QRK1 w - - 1 21\nShow me the board.", "gold_answer": "8 r . . . q r k .\n7 . . . . . p p .\n6 . . . . p . . p\n5 p N . p . . . .\n4 . . . . n . . .\n3 P . . . P . . P\n2 . . . . . P P .\n1 . R B . Q R K .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01616", "split": "perception", "task_type": "board_to_fen", "fen": "rnb1kbnr/pp2pppp/3p4/q1P5/4P3/2N5/PPP2PPP/R1BQKBNR b KQkq -", "prompt": "Here is the current board:\n8 r n b . k b n r\n7 p p . . p p p p\n6 . . . p . . . .\n5 q . P . . . . .\n4 . . . . P . . .\n3 . . N . . . . .\n2 P P P . . P P P\n1 R . B Q K B N R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "rnb1kbnr/pp2pppp/3p4/q1P5/4P3/2N5/PPP2PPP/R1BQKBNR b KQkq - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01617", "split": "perception", "task_type": "piece_id", "fen": "r1bqkb1r/pp2pppp/2n5/4P3/1nB5/5N2/PP3PPP/RNBQ1RK1 b kq -", "prompt": "FEN: r1bqkb1r/pp2pppp/2n5/4P3/1nB5/5N2/PP3PPP/RNBQ1RK1 b kq -\nWhat piece is on b4?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black knight", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "b4"}} {"example_id": "perception_01618", "split": "perception", "task_type": "material_count", "fen": "2k5/p6R/1p4r1/2pQ4/8/PP6/8/2K5 b - - 10 44", "prompt": "FEN: 2k5/p6R/1p4r1/2pQ4/8/PP6/8/2K5 b - - 10 44\nWhat is the material count for both sides?", "gold_answer": "White (5 pieces): 1 king, 2 pawns, 1 queen, 1 rook. Black (5 pieces): 1 king, 3 pawns, 1 rook. White is up 8 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01619", "split": "perception", "task_type": "square_lookup", "fen": "2n5/1k1Q4/1p4r1/pP2rp2/P4R1p/7P/5P1K/5R2 b - - 1 38", "prompt": "FEN: 2n5/1k1Q4/1p4r1/pP2rp2/P4R1p/7P/5P1K/5R2 b - - 1 38\nWhat is on c3?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "c3=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "c3", "diagnostic": true, "hard_gate": false, "square": "c3"}} {"example_id": "perception_01620", "split": "perception", "task_type": "rank_lookup", "fen": "r4b1r/1pp2Qpp/p1kp1p2/1N6/1P1qP3/P2P3P/5PP1/R4RK1 w - - 2 21", "prompt": "FEN: r4b1r/1pp2Qpp/p1kp1p2/1N6/1P1qP3/P2P3P/5PP1/R4RK1 w - - 2 21\nWhat is the compressed FEN row for rank 7?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 7: 1pp2Qpp", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "7", "_rank_lookup_row": "1pp2Qpp", "diagnostic": true, "hard_gate": false, "rank": "7", "fen_rank_row": "1pp2Qpp"}} {"example_id": "perception_01621", "split": "perception", "task_type": "square_coordinates", "fen": "5rr1/k1p5/pp1p4/3Q3N/6qp/2PNP3/PP4PP/R5K1 w - - 2 30", "prompt": "FEN: 5rr1/k1p5/pp1p4/3Q3N/6qp/2PNP3/PP4PP/R5K1 w - - 2 30\nFor square c5, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "c5: file=c; rank=5; fen_row_from_top=4; file_index=3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "c5", "diagnostic": true, "hard_gate": false, "square": "c5"}} {"example_id": "perception_01622", "split": "perception", "task_type": "fen_rank_expansion", "fen": "8/5k2/1p6/3b1p1p/1p2pP1P/1P2Q1PK/P2bN3/2Nr4 w - -", "prompt": "FEN: 8/5k2/1p6/3b1p1p/1p2pP1P/1P2Q1PK/P2bN3/2Nr4 w - -\nCompressed rank 4 row: 1p2pP1P\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 4: a=1; b=p; c=1; d=1; e=p; f=P; g=1; h=P", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "4", "_fen_rank_expansion_row": "1p2pP1P", "diagnostic": true, "hard_gate": false, "rank": "4", "fen_rank_row": "1p2pP1P"}} {"example_id": "perception_01623", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "2R3k1/5b2/1p1Bp2p/pP1pPppP/3P1P1P/1K6/4B3/8 b - - 0 45", "prompt": "Rank 7 row before: 5b2\nFile h changes from 1 to k. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 7: 5b2 -> 5b1k", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "g8h7", "_fen_rank_cell_edit_square": "h7", "_fen_rank_cell_edit_rank": "7", "_fen_rank_cell_edit_file": "h", "_fen_rank_cell_edit_before_row": "5b2", "_fen_rank_cell_edit_after_row": "5b1k", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "k", "diagnostic": true, "hard_gate": false, "move": "g8h7", "square": "h7", "rank": "7", "file": "h", "before_row": "5b2", "after_row": "5b1k", "before_fen": "1", "after_fen": "k"}} {"example_id": "perception_01624", "split": "perception", "task_type": "fen_board_edit", "fen": "8/1p3B1k/p2p2p1/q1p1r1Pp/P6P/1P1Q4/2P5/2KR4 b - - 0 33", "prompt": "Board FEN before: 8/1p3B1k/p2p2p1/q1p1r1Pp/P6P/1P1Q4/2P5/2KR4\nApply square edits: e5 r->1; e7 1->r\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 8/1p2rB1k/p2p2p1/q1p3Pp/P6P/1P1Q4/2P5/2KR4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "e5e7", "_fen_board_edit_board_fen_before": "8/1p3B1k/p2p2p1/q1p1r1Pp/P6P/1P1Q4/2P5/2KR4", "_fen_board_edit_board_fen_after": "8/1p2rB1k/p2p2p1/q1p3Pp/P6P/1P1Q4/2P5/2KR4", "_fen_board_edit_edit_text": "e5 r->1; e7 1->r", "_fen_board_edit_changed_squares": [{"square": "e5", "before": "black rook", "after": "empty", "before_fen": "r", "after_fen": "1"}, {"square": "e7", "before": "empty", "after": "black rook", "before_fen": "1", "after_fen": "r"}], "diagnostic": true, "hard_gate": false, "move": "e5e7", "board_fen_before": "8/1p3B1k/p2p2p1/q1p1r1Pp/P6P/1P1Q4/2P5/2KR4", "board_fen_after": "8/1p2rB1k/p2p2p1/q1p3Pp/P6P/1P1Q4/2P5/2KR4", "edit_text": "e5 r->1; e7 1->r", "changed_squares": [{"square": "e5", "before": "black rook", "after": "empty", "before_fen": "r", "after_fen": "1"}, {"square": "e7", "before": "empty", "after": "black rook", "before_fen": "1", "after_fen": "r"}]}} {"example_id": "perception_01625", "split": "perception", "task_type": "move_square_edits", "fen": "R6r/2p2pkp/2B3p1/1P4Q1/3P4/6Pb/5P1P/5RK1 b - -", "prompt": "Starting FEN: R6r/2p2pkp/2B3p1/1P4Q1/3P4/6Pb/5P1P/5RK1 b - -\nMove: h3f5\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: h3=black bishop; f5=empty.\nSquares: h3 black bishop->empty; f5 empty->black bishop.\nRanks: rank 3 h b->1; rank 5 f 1->b.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "h3f5", "diagnostic": true, "hard_gate": false, "move": "h3f5"}} {"example_id": "perception_01626", "split": "perception", "task_type": "fen_assembly", "fen": "rnb1kbnr/pp1pqppp/8/2p1p3/2B1P3/2N2N2/PPPP1PPP/R1BQK2R b KQkq - 3 4", "prompt": "Starting FEN: rnb1kbnr/pp1pqppp/8/2p1p3/2B1P3/2N2N2/PPPP1PPP/R1BQK2R b KQkq - 3 4\nMove: b8a6\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 3\nFullmove number: 4\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black knight b8a6.\nLookup: b8=black knight; a6=empty.\nSquares: b8 black knight->empty; a6 empty->black knight.\nRanks: rank 8 b n->1; rank 6 a 1->n.\nResult FEN: r1b1kbnr/pp1pqppp/n7/2p1p3/2B1P3/2N2N2/PPPP1PPP/R1BQK2R w KQkq - 4 5", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "b8a6", "diagnostic": true, "hard_gate": false, "move": "b8a6"}} {"example_id": "perception_01627", "split": "perception", "task_type": "fen_row_application", "fen": "r2qk2r/1Rp2ppp/p3p3/8/P1NPnB2/Q3P3/5PPP/5RK1 b kq - 0 19", "prompt": "Starting FEN: r2qk2r/1Rp2ppp/p3p3/8/P1NPnB2/Q3P3/5PPP/5RK1 b kq - 0 19\nMove: d8d6\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: kq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 19\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 8 r2qk2r->r3k2r; rank 6 p3p3->p2qp3.\nResult FEN: r3k2r/1Rp2ppp/p2qp3/8/P1NPnB2/Q3P3/5PPP/5RK1 w kq - 1 20", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "d8d6", "_fen_row_application_rank_rewrites": [{"rank": "8", "before": "r2qk2r", "after": "r3k2r"}, {"rank": "6", "before": "p3p3", "after": "p2qp3"}], "diagnostic": true, "hard_gate": false, "move": "d8d6", "rank_rewrites": [{"rank": "8", "before": "r2qk2r", "after": "r3k2r"}, {"rank": "6", "before": "p3p3", "after": "p2qp3"}]}} {"example_id": "perception_01628", "split": "perception", "task_type": "state_tracking", "fen": "2r2rk1/1p2bpp1/3pq2p/2p4P/2Q1P1P1/1P1P1B2/P1P2P2/R3K2R b KQ - 1 21", "prompt": "Starting FEN: 2r2rk1/1p2bpp1/3pq2p/2p4P/2Q1P1P1/1P1P1B2/P1P2P2/R3K2R b KQ - 1 21\nAfter the moves c8c6, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 1\nFullmove number: 21\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 5rk1/1p2bpp1/2rpq2p/2p4P/2Q1P1P1/1P1P1B2/P1P2P2/R3K2R w KQ - 2 22", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "c8c6", "_state_tracking_result": "5rk1/1p2bpp1/2rpq2p/2p4P/2Q1P1P1/1P1P1B2/P1P2P2/R3K2R w KQ - 2 22"}} {"example_id": "perception_01629", "split": "perception", "task_type": "material_inventory", "fen": "r2q1rk1/pppbbppp/1nnp4/4p1P1/4P2P/P1N5/BPPP1P2/R1BQK1NR w KQ - 5 10", "prompt": "FEN: r2q1rk1/pppbbppp/1nnp4/4p1P1/4P2P/P1N5/BPPP1P2/R1BQK1NR w KQ - 5 10\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=e1; queen=d1; rook=a1,h1; bishop=c1,a2; knight=g1,c3; pawn=b2,c2,d2,f2,a3,e4,h4,g5.\nBlack inventory: king=g8; queen=d8; rook=a8,f8; bishop=d7,e7; knight=b6,c6; pawn=e5,d6,a7,b7,c7,f7,g7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01630", "split": "perception", "task_type": "material_piece_counts", "fen": "8/1R6/8/2k5/8/8/8/2K5 b - -", "prompt": "FEN: 8/1R6/8/2k5/8/8/8/2K5 b - -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=1; bishop=0; knight=0; pawn=0.\nBlack counts: king=1; queen=0; rook=0; bishop=0; knight=0; pawn=0.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01631", "split": "perception", "task_type": "material_value_totals", "fen": "r2q1rk1/1pp2p1p/p1n2pp1/3b4/3P4/P1R1PN2/1P2BPPP/3Q1RK1 w - - 2 14", "prompt": "FEN: r2q1rk1/1pp2p1p/p1n2pp1/3b4/3P4/P1R1PN2/1P2BPPP/3Q1RK1 w - - 2 14\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=3; knight=3; pawn=7; total=32.\nBlack values: king=0; queen=9; rook=10; bishop=3; knight=3; pawn=7; total=32.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01632", "split": "perception", "task_type": "material_balance_trace", "fen": "8/p3kp1p/1p1p1n2/1P1P4/5p1P/5P2/r5r1/5K2 b - - 1 39", "prompt": "FEN: 8/p3kp1p/1p1p1n2/1P1P4/5p1P/5P2/r5r1/5K2 b - - 1 39\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=f1; queen=none; rook=none; bishop=none; knight=none; pawn=f3,h4,b5,d5 | black king=e7; queen=none; rook=a2,g2; bishop=none; knight=f6; pawn=f4,b6,d6,a7,f7,h7\nCounts: white king=1; queen=0; rook=0; bishop=0; knight=0; pawn=4 | black king=1; queen=0; rook=2; bishop=0; knight=1; pawn=6\nValues: white total=4; black total=19\nBalance: Black is up 15 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01633", "split": "perception", "task_type": "multi_state_tracking", "fen": "r4rk1/pp3ppp/2pb4/3pN1q1/3P4/2N5/PPP2P2/R2Q1R1K b - -", "prompt": "Starting FEN: r4rk1/pp3ppp/2pb4/3pN1q1/3P4/2N5/PPP2P2/R2Q1R1K b - - 0 1\nAfter the moves a8b8 a2a3 g5d2, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 1r3rk1/pp3ppp/2pb4/3pN3/3P4/P1N5/1PPq1P2/R2Q1R1K w - - 1 3", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "a8b8 a2a3 g5d2", "_multi_state_tracking_result": "1r3rk1/pp3ppp/2pb4/3pN3/3P4/P1N5/1PPq1P2/R2Q1R1K w - - 1 3", "diagnostic": true, "hard_gate": false, "moves": "a8b8 a2a3 g5d2"}} {"example_id": "perception_01634", "split": "perception", "task_type": "board_print", "fen": "8/5k2/1p1p4/p1pP1K2/P1B1P3/1P3b2/8/8 b - - 8 39", "prompt": "Position (FEN): 8/5k2/1p1p4/p1pP1K2/P1B1P3/1P3b2/8/8 b - - 8 39\nShow me the board.", "gold_answer": "8 . . . . . . . .\n7 . . . . . k . .\n6 . p . p . . . .\n5 p . p P . K . .\n4 P . B . P . . .\n3 . P . . . b . .\n2 . . . . . . . .\n1 . . . . . . . .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01635", "split": "perception", "task_type": "board_to_fen", "fen": "1B1qk2r/1b2npbp/pp4p1/n1pp4/P7/2NP4/BPPN2PP/R3QRK1 b k - 0 17", "prompt": "Here is the current board:\n8 . B . q k . . r\n7 . b . . n p b p\n6 p p . . . . p .\n5 n . p p . . . .\n4 P . . . . . . .\n3 . . N P . . . .\n2 B P P N . . P P\n1 R . . . Q R K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: k\nEn passant: none\nHalfmove clock: 0\nFullmove number: 17\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "1B1qk2r/1b2npbp/pp4p1/n1pp4/P7/2NP4/BPPN2PP/R3QRK1 b k - 0 17", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01636", "split": "perception", "task_type": "piece_id", "fen": "r2qk2r/p2bbppp/2p2n2/3p4/3p4/5N2/PPPNQPPP/R1B1R1K1 w kq -", "prompt": "FEN: r2qk2r/p2bbppp/2p2n2/3p4/3p4/5N2/PPPNQPPP/R1B1R1K1 w kq -\nWhat piece is on e7?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black bishop", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "e7"}} {"example_id": "perception_01637", "split": "perception", "task_type": "material_count", "fen": "rnb1kb1r/ppp3pp/5p2/3Bp3/4P2q/5Q2/PPPP1PPP/RNB1K1NR b KQkq - 0 5", "prompt": "FEN: rnb1kb1r/ppp3pp/5p2/3Bp3/4P2q/5Q2/PPPP1PPP/RNB1K1NR b KQkq - 0 5\nWhat is the material count for both sides?", "gold_answer": "White (16 pieces): 2 bishops, 1 king, 2 knights, 8 pawns, 1 queen, 2 rooks. Black (14 pieces): 2 bishops, 1 king, 1 knight, 7 pawns, 1 queen, 2 rooks. White is up 4 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01638", "split": "perception", "task_type": "square_lookup", "fen": "8/2pk2p1/1pnp4/r3p1B1/2P1PP2/P2K4/1Q5r/6R1 w - - 0 29", "prompt": "FEN: 8/2pk2p1/1pnp4/r3p1B1/2P1PP2/P2K4/1Q5r/6R1 w - - 0 29\nWhat is on h2?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "h2=black rook", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "h2", "diagnostic": true, "hard_gate": false, "square": "h2"}} {"example_id": "perception_01639", "split": "perception", "task_type": "rank_lookup", "fen": "8/3r4/7Q/8/6k1/8/4K3/8 b - -", "prompt": "FEN: 8/3r4/7Q/8/6k1/8/4K3/8 b - -\nWhat is the compressed FEN row for rank 1?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 1: 8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "1", "_rank_lookup_row": "8", "diagnostic": true, "hard_gate": false, "rank": "1", "fen_rank_row": "8"}} {"example_id": "perception_01640", "split": "perception", "task_type": "square_coordinates", "fen": "8/r5pk/1R3p1p/8/1pN5/7P/r5PK/8 b - - 5 44", "prompt": "FEN: 8/r5pk/1R3p1p/8/1pN5/7P/r5PK/8 b - - 5 44\nFor square h2, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "h2: file=h; rank=2; fen_row_from_top=7; file_index=8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "h2", "diagnostic": true, "hard_gate": false, "square": "h2"}} {"example_id": "perception_01641", "split": "perception", "task_type": "fen_rank_expansion", "fen": "rn1q1rk1/pp3ppp/5n2/1Pb1B3/8/3BP2P/2P1QPP1/RN2K2R b KQ - 0 12", "prompt": "FEN: rn1q1rk1/pp3ppp/5n2/1Pb1B3/8/3BP2P/2P1QPP1/RN2K2R b KQ - 0 12\nCompressed rank 7 row: pp3ppp\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 7: a=p; b=p; c=1; d=1; e=1; f=p; g=p; h=p", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "7", "_fen_rank_expansion_row": "pp3ppp", "diagnostic": true, "hard_gate": false, "rank": "7", "fen_rank_row": "pp3ppp"}} {"example_id": "perception_01642", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "rnbqkb1r/ppp2ppp/1n6/3Pp3/4P3/2N5/PP3PPP/R1BQKBNR b KQkq -", "prompt": "Rank 7 row before: ppp2ppp\nFile d changes from 1 to k. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 7: ppp2ppp -> pppk1ppp", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "e8d7", "_fen_rank_cell_edit_square": "d7", "_fen_rank_cell_edit_rank": "7", "_fen_rank_cell_edit_file": "d", "_fen_rank_cell_edit_before_row": "ppp2ppp", "_fen_rank_cell_edit_after_row": "pppk1ppp", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "k", "diagnostic": true, "hard_gate": false, "move": "e8d7", "square": "d7", "rank": "7", "file": "d", "before_row": "ppp2ppp", "after_row": "pppk1ppp", "before_fen": "1", "after_fen": "k"}} {"example_id": "perception_01643", "split": "perception", "task_type": "fen_board_edit", "fen": "k3rb2/1p3qp1/pBp1nr2/5B2/4P1QP/1P3P2/P7/1K1R3R b - -", "prompt": "Board FEN before: k3rb2/1p3qp1/pBp1nr2/5B2/4P1QP/1P3P2/P7/1K1R3R\nApply square edits: e8 r->1; b8 1->r\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: kr3b2/1p3qp1/pBp1nr2/5B2/4P1QP/1P3P2/P7/1K1R3R", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "e8b8", "_fen_board_edit_board_fen_before": "k3rb2/1p3qp1/pBp1nr2/5B2/4P1QP/1P3P2/P7/1K1R3R", "_fen_board_edit_board_fen_after": "kr3b2/1p3qp1/pBp1nr2/5B2/4P1QP/1P3P2/P7/1K1R3R", "_fen_board_edit_edit_text": "e8 r->1; b8 1->r", "_fen_board_edit_changed_squares": [{"square": "e8", "before": "black rook", "after": "empty", "before_fen": "r", "after_fen": "1"}, {"square": "b8", "before": "empty", "after": "black rook", "before_fen": "1", "after_fen": "r"}], "diagnostic": true, "hard_gate": false, "move": "e8b8", "board_fen_before": "k3rb2/1p3qp1/pBp1nr2/5B2/4P1QP/1P3P2/P7/1K1R3R", "board_fen_after": "kr3b2/1p3qp1/pBp1nr2/5B2/4P1QP/1P3P2/P7/1K1R3R", "edit_text": "e8 r->1; b8 1->r", "changed_squares": [{"square": "e8", "before": "black rook", "after": "empty", "before_fen": "r", "after_fen": "1"}, {"square": "b8", "before": "empty", "after": "black rook", "before_fen": "1", "after_fen": "r"}]}} {"example_id": "perception_01644", "split": "perception", "task_type": "move_square_edits", "fen": "8/7p/4k3/4p1p1/2Np3P/1rbR1P2/8/7K w - - 0 39", "prompt": "Starting FEN: 8/7p/4k3/4p1p1/2Np3P/1rbR1P2/8/7K w - - 0 39\nMove: d3e3\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: d3=white rook; e3=empty.\nSquares: d3 white rook->empty; e3 empty->white rook.\nRanks: rank 3 d R->1; rank 3 e 1->R.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "d3e3", "diagnostic": true, "hard_gate": false, "move": "d3e3"}} {"example_id": "perception_01645", "split": "perception", "task_type": "fen_assembly", "fen": "r3k3/1p1n1p1p/p3p1p1/8/P1PB1PP1/1P5P/4K3/3R4 b - -", "prompt": "Starting FEN: r3k3/1p1n1p1p/p3p1p1/8/P1PB1PP1/1P5P/4K3/3R4 b - - 0 1\nMove: a8d8\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black rook a8d8.\nLookup: a8=black rook; d8=empty.\nSquares: a8 black rook->empty; d8 empty->black rook.\nRanks: rank 8 a r->1; rank 8 d 1->r.\nResult FEN: 3rk3/1p1n1p1p/p3p1p1/8/P1PB1PP1/1P5P/4K3/3R4 w - - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "a8d8", "diagnostic": true, "hard_gate": false, "move": "a8d8"}} {"example_id": "perception_01646", "split": "perception", "task_type": "fen_row_application", "fen": "4r3/4Pk2/1R2R1pp/2P2p2/8/2r5/6PP/6K1 b - - 3 43", "prompt": "Starting FEN: 4r3/4Pk2/1R2R1pp/2P2p2/8/2r5/6PP/6K1 b - - 3 43\nMove: e8g8\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 3\nFullmove number: 43\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 8 4r3->6r1.\nResult FEN: 6r1/4Pk2/1R2R1pp/2P2p2/8/2r5/6PP/6K1 w - - 4 44", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "e8g8", "_fen_row_application_rank_rewrites": [{"rank": "8", "before": "4r3", "after": "6r1"}], "diagnostic": true, "hard_gate": false, "move": "e8g8", "rank_rewrites": [{"rank": "8", "before": "4r3", "after": "6r1"}]}} {"example_id": "perception_01647", "split": "perception", "task_type": "state_tracking", "fen": "2kr1b1r/1pp1pppp/p1n2n2/q4b2/8/P1NP1N2/1PPBBPPP/R2Q1RK1 b - - 0 9", "prompt": "Starting FEN: 2kr1b1r/1pp1pppp/p1n2n2/q4b2/8/P1NP1N2/1PPBBPPP/R2Q1RK1 b - - 0 9\nAfter the moves f5h3, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 9\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 2kr1b1r/1pp1pppp/p1n2n2/q7/8/P1NP1N1b/1PPBBPPP/R2Q1RK1 w - - 1 10", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "f5h3", "_state_tracking_result": "2kr1b1r/1pp1pppp/p1n2n2/q7/8/P1NP1N1b/1PPBBPPP/R2Q1RK1 w - - 1 10"}} {"example_id": "perception_01648", "split": "perception", "task_type": "material_inventory", "fen": "r3k1nr/p4pbp/1qbp2p1/8/Rp2P3/3B1P2/1P2NRPP/1N1Q2K1 w kq - 4 18", "prompt": "FEN: r3k1nr/p4pbp/1qbp2p1/8/Rp2P3/3B1P2/1P2NRPP/1N1Q2K1 w kq - 4 18\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=d1; rook=f2,a4; bishop=d3; knight=b1,e2; pawn=b2,g2,h2,f3,e4.\nBlack inventory: king=e8; queen=b6; rook=a8,h8; bishop=c6,g7; knight=g8; pawn=b4,d6,g6,a7,f7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01649", "split": "perception", "task_type": "material_piece_counts", "fen": "r4r1k/pp5p/1n1p4/3P3q/2PP1p2/P4P2/2QBK3/R5R1 b - - 0 26", "prompt": "FEN: r4r1k/pp5p/1n1p4/3P3q/2PP1p2/P4P2/2QBK3/R5R1 b - - 0 26\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=1; knight=0; pawn=5.\nBlack counts: king=1; queen=1; rook=2; bishop=0; knight=1; pawn=5.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01650", "split": "perception", "task_type": "material_value_totals", "fen": "rn1qkb1r/ppp1ppp1/5nbp/8/7P/5NN1/PPPP1PP1/R1BQKB1R w KQkq -", "prompt": "FEN: rn1qkb1r/ppp1ppp1/5nbp/8/7P/5NN1/PPPP1PP1/R1BQKB1R w KQkq -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=7; total=38.\nBlack values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=7; total=38.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01651", "split": "perception", "task_type": "material_balance_trace", "fen": "r2qk2r/pp3ppp/2n2n2/4p3/1bP3b1/3P1N2/PP1BBPPP/RN1QK2R b KQkq - 2 8", "prompt": "FEN: r2qk2r/pp3ppp/2n2n2/4p3/1bP3b1/3P1N2/PP1BBPPP/RN1QK2R b KQkq - 2 8\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=e1; queen=d1; rook=a1,h1; bishop=d2,e2; knight=b1,f3; pawn=a2,b2,f2,g2,h2,d3,c4 | black king=e8; queen=d8; rook=a8,h8; bishop=b4,g4; knight=c6,f6; pawn=e5,a7,b7,f7,g7,h7\nCounts: white king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7 | black king=1; queen=1; rook=2; bishop=2; knight=2; pawn=6\nValues: white total=38; black total=37\nBalance: White is up 1 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01652", "split": "perception", "task_type": "multi_state_tracking", "fen": "8/1b6/1Pp1P3/3p3k/5K2/3BP2P/8/8 b - - 0 51", "prompt": "Starting FEN: 8/1b6/1Pp1P3/3p3k/5K2/3BP2P/8/8 b - - 0 51\nAfter the moves b7c8 f4f3 c6c5, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 51\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 2b5/8/1P2P3/2pp3k/8/3BPK1P/8/8 w - - 0 53", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "b7c8 f4f3 c6c5", "_multi_state_tracking_result": "2b5/8/1P2P3/2pp3k/8/3BPK1P/8/8 w - - 0 53", "diagnostic": true, "hard_gate": false, "moves": "b7c8 f4f3 c6c5"}} {"example_id": "perception_01653", "split": "perception", "task_type": "board_print", "fen": "r3kbnr/pb2q1pp/1pp5/3pn3/3P1P2/2NB4/PP4PP/R1BQ1RK1 w kq - 0 12", "prompt": "Position (FEN): r3kbnr/pb2q1pp/1pp5/3pn3/3P1P2/2NB4/PP4PP/R1BQ1RK1 w kq - 0 12\nShow me the board.", "gold_answer": "8 r . . . k b n r\n7 p b . . q . p p\n6 . p p . . . . .\n5 . . . p n . . .\n4 . . . P . P . .\n3 . . N B . . . .\n2 P P . . . . P P\n1 R . B Q . R K .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01654", "split": "perception", "task_type": "board_to_fen", "fen": "r2qk2r/1ppb1ppp/p1n2n2/b3p1B1/N1BpP3/P2P1N2/1PP2PPP/R2Q1RK1 w kq - 0 11", "prompt": "Here is the current board:\n8 r . . q k . . r\n7 . p p b . p p p\n6 p . n . . n . .\n5 b . . . p . B .\n4 N . B p P . . .\n3 P . . P . N . .\n2 . P P . . P P P\n1 R . . Q . R K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: kq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 11\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r2qk2r/1ppb1ppp/p1n2n2/b3p1B1/N1BpP3/P2P1N2/1PP2PPP/R2Q1RK1 w kq - 0 11", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01655", "split": "perception", "task_type": "piece_id", "fen": "r3k1n1/5p2/2pp2p1/pp2p3/4P3/PQPPBq1B/1P3P1p/R3K2R w Qq - 0 23", "prompt": "FEN: r3k1n1/5p2/2pp2p1/pp2p3/4P3/PQPPBq1B/1P3P1p/R3K2R w Qq - 0 23\nWhat piece is on g6?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "g6"}} {"example_id": "perception_01656", "split": "perception", "task_type": "material_count", "fen": "r1bqkb1r/p4p1p/4p1p1/3pP3/1ppP4/2P4Q/PPBN1PPP/R3K2R w KQkq -", "prompt": "FEN: r1bqkb1r/p4p1p/4p1p1/3pP3/1ppP4/2P4Q/PPBN1PPP/R3K2R w KQkq -\nWhat is the material count for both sides?", "gold_answer": "White (14 pieces): 1 bishop, 1 king, 1 knight, 8 pawns, 1 queen, 2 rooks. Black (14 pieces): 2 bishops, 1 king, 8 pawns, 1 queen, 2 rooks. Material is equal.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01657", "split": "perception", "task_type": "square_lookup", "fen": "k7/8/1K6/B3N3/8/8/8/8 w - -", "prompt": "FEN: k7/8/1K6/B3N3/8/8/8/8 w - -\nWhat is on d6?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "d6=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "d6", "diagnostic": true, "hard_gate": false, "square": "d6"}} {"example_id": "perception_01658", "split": "perception", "task_type": "rank_lookup", "fen": "r4rk1/1pp1b3/p3pp1p/8/P3q3/5NP1/1P2PPKP/R1QR4 w - -", "prompt": "FEN: r4rk1/1pp1b3/p3pp1p/8/P3q3/5NP1/1P2PPKP/R1QR4 w - -\nWhat is the compressed FEN row for rank 4?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 4: P3q3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "4", "_rank_lookup_row": "P3q3", "diagnostic": true, "hard_gate": false, "rank": "4", "fen_rank_row": "P3q3"}} {"example_id": "perception_01659", "split": "perception", "task_type": "square_coordinates", "fen": "8/3k1pp1/4p2p/3pP3/1Pp5/1PKn1N1P/5PP1/8 b - -", "prompt": "FEN: 8/3k1pp1/4p2p/3pP3/1Pp5/1PKn1N1P/5PP1/8 b - -\nFor square d4, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "d4: file=d; rank=4; fen_row_from_top=5; file_index=4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "d4", "diagnostic": true, "hard_gate": false, "square": "d4"}} {"example_id": "perception_01660", "split": "perception", "task_type": "fen_rank_expansion", "fen": "rnbqk2r/ppppppbp/6p1/8/2PPn2P/5N2/PP3PP1/RNBQKB1R b KQkq -", "prompt": "FEN: rnbqk2r/ppppppbp/6p1/8/2PPn2P/5N2/PP3PP1/RNBQKB1R b KQkq -\nCompressed rank 7 row: ppppppbp\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 7: a=p; b=p; c=p; d=p; e=p; f=p; g=b; h=p", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "7", "_fen_rank_expansion_row": "ppppppbp", "diagnostic": true, "hard_gate": false, "rank": "7", "fen_rank_row": "ppppppbp"}} {"example_id": "perception_01661", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "2r2rk1/pb1n1ppp/3p4/4p3/PPPpP2q/3B3P/3B1PP1/1Q2RRK1 b - - 0 19", "prompt": "Rank 8 row before: 2r2rk1\nFile h changes from 1 to k. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 8: 2r2rk1 -> 2r2r1k", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "g8h8", "_fen_rank_cell_edit_square": "h8", "_fen_rank_cell_edit_rank": "8", "_fen_rank_cell_edit_file": "h", "_fen_rank_cell_edit_before_row": "2r2rk1", "_fen_rank_cell_edit_after_row": "2r2r1k", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "k", "diagnostic": true, "hard_gate": false, "move": "g8h8", "square": "h8", "rank": "8", "file": "h", "before_row": "2r2rk1", "after_row": "2r2r1k", "before_fen": "1", "after_fen": "k"}} {"example_id": "perception_01662", "split": "perception", "task_type": "fen_board_edit", "fen": "rn1r2k1/pq2bp1p/bp2p1p1/3pPP2/B2P4/4B3/PP2N1PP/2RQ1RK1 b - -", "prompt": "Board FEN before: rn1r2k1/pq2bp1p/bp2p1p1/3pPP2/B2P4/4B3/PP2N1PP/2RQ1RK1\nApply square edits: e7 b->1; h4 1->b\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: rn1r2k1/pq3p1p/bp2p1p1/3pPP2/B2P3b/4B3/PP2N1PP/2RQ1RK1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "e7h4", "_fen_board_edit_board_fen_before": "rn1r2k1/pq2bp1p/bp2p1p1/3pPP2/B2P4/4B3/PP2N1PP/2RQ1RK1", "_fen_board_edit_board_fen_after": "rn1r2k1/pq3p1p/bp2p1p1/3pPP2/B2P3b/4B3/PP2N1PP/2RQ1RK1", "_fen_board_edit_edit_text": "e7 b->1; h4 1->b", "_fen_board_edit_changed_squares": [{"square": "e7", "before": "black bishop", "after": "empty", "before_fen": "b", "after_fen": "1"}, {"square": "h4", "before": "empty", "after": "black bishop", "before_fen": "1", "after_fen": "b"}], "diagnostic": true, "hard_gate": false, "move": "e7h4", "board_fen_before": "rn1r2k1/pq2bp1p/bp2p1p1/3pPP2/B2P4/4B3/PP2N1PP/2RQ1RK1", "board_fen_after": "rn1r2k1/pq3p1p/bp2p1p1/3pPP2/B2P3b/4B3/PP2N1PP/2RQ1RK1", "edit_text": "e7 b->1; h4 1->b", "changed_squares": [{"square": "e7", "before": "black bishop", "after": "empty", "before_fen": "b", "after_fen": "1"}, {"square": "h4", "before": "empty", "after": "black bishop", "before_fen": "1", "after_fen": "b"}]}} {"example_id": "perception_01663", "split": "perception", "task_type": "move_square_edits", "fen": "r1bqkb1r/pp1p1ppp/4pn2/2p1n3/2P1P3/2NP2P1/PP2NP1P/R1BQKB1R b KQkq -", "prompt": "Starting FEN: r1bqkb1r/pp1p1ppp/4pn2/2p1n3/2P1P3/2NP2P1/PP2NP1P/R1BQKB1R b KQkq -\nMove: e5f3\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: e5=black knight; f3=empty.\nSquares: e5 black knight->empty; f3 empty->black knight.\nRanks: rank 5 e n->1; rank 3 f 1->n.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "e5f3", "diagnostic": true, "hard_gate": false, "move": "e5f3"}} {"example_id": "perception_01664", "split": "perception", "task_type": "fen_assembly", "fen": "3r2k1/1b3pbp/pq3np1/1p6/1PpN4/P1B1PP2/2Q3PP/3RN1K1 w - -", "prompt": "Starting FEN: 3r2k1/1b3pbp/pq3np1/1p6/1PpN4/P1B1PP2/2Q3PP/3RN1K1 w - - 0 1\nMove: d1d3\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white rook d1d3.\nLookup: d1=white rook; d3=empty.\nSquares: d1 white rook->empty; d3 empty->white rook.\nRanks: rank 1 d R->1; rank 3 d 1->R.\nResult FEN: 3r2k1/1b3pbp/pq3np1/1p6/1PpN4/P1BRPP2/2Q3PP/4N1K1 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "d1d3", "diagnostic": true, "hard_gate": false, "move": "d1d3"}} {"example_id": "perception_01665", "split": "perception", "task_type": "fen_row_application", "fen": "2rr4/2p2kpp/p3Rp2/1pNn4/1P1P4/P3P3/5PPP/5RK1 b - - 0 24", "prompt": "Starting FEN: 2rr4/2p2kpp/p3Rp2/1pNn4/1P1P4/P3P3/5PPP/5RK1 b - - 0 24\nMove: d8d6\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 24\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 8 2rr4->2r5; rank 6 p3Rp2->p2rRp2.\nResult FEN: 2r5/2p2kpp/p2rRp2/1pNn4/1P1P4/P3P3/5PPP/5RK1 w - - 1 25", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "d8d6", "_fen_row_application_rank_rewrites": [{"rank": "8", "before": "2rr4", "after": "2r5"}, {"rank": "6", "before": "p3Rp2", "after": "p2rRp2"}], "diagnostic": true, "hard_gate": false, "move": "d8d6", "rank_rewrites": [{"rank": "8", "before": "2rr4", "after": "2r5"}, {"rank": "6", "before": "p3Rp2", "after": "p2rRp2"}]}} {"example_id": "perception_01666", "split": "perception", "task_type": "state_tracking", "fen": "2b2rk1/1p2qpp1/3b1n1p/8/8/3BPN2/2Q2PPP/B4RK1 b - - 1 21", "prompt": "Starting FEN: 2b2rk1/1p2qpp1/3b1n1p/8/8/3BPN2/2Q2PPP/B4RK1 b - - 1 21\nAfter the moves b7b6, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 21\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 2b2rk1/4qpp1/1p1b1n1p/8/8/3BPN2/2Q2PPP/B4RK1 w - - 0 22", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "b7b6", "_state_tracking_result": "2b2rk1/4qpp1/1p1b1n1p/8/8/3BPN2/2Q2PPP/B4RK1 w - - 0 22"}} {"example_id": "perception_01667", "split": "perception", "task_type": "material_inventory", "fen": "8/8/8/8/3pk3/8/8/3K4 w - -", "prompt": "FEN: 8/8/8/8/3pk3/8/8/3K4 w - -\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=d1; queen=none; rook=none; bishop=none; knight=none; pawn=none.\nBlack inventory: king=e4; queen=none; rook=none; bishop=none; knight=none; pawn=d4.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01668", "split": "perception", "task_type": "material_piece_counts", "fen": "8/8/R5p1/P1pk3b/3p1P1P/3K4/7r/8 w - - 1 47", "prompt": "FEN: 8/8/R5p1/P1pk3b/3p1P1P/3K4/7r/8 w - - 1 47\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=1; bishop=0; knight=0; pawn=3.\nBlack counts: king=1; queen=0; rook=1; bishop=1; knight=0; pawn=3.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01669", "split": "perception", "task_type": "material_value_totals", "fen": "8/2K5/3N4/2k5/8/8/7B/8 w - -", "prompt": "FEN: 8/2K5/3N4/2k5/8/8/7B/8 w - -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=0; bishop=3; knight=3; pawn=0; total=6.\nBlack values: king=0; queen=0; rook=0; bishop=0; knight=0; pawn=0; total=0.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01670", "split": "perception", "task_type": "material_balance_trace", "fen": "rnbqk1nr/pp3pb1/3p2pp/2pPp3/2P1P3/3B4/PP2NPPP/RNBQ1RK1 b kq - 3 7", "prompt": "FEN: rnbqk1nr/pp3pb1/3p2pp/2pPp3/2P1P3/3B4/PP2NPPP/RNBQ1RK1 b kq - 3 7\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=d1; rook=a1,f1; bishop=c1,d3; knight=b1,e2; pawn=a2,b2,f2,g2,h2,c4,e4,d5 | black king=e8; queen=d8; rook=a8,h8; bishop=g7,c8; knight=b8,g8; pawn=c5,e5,d6,g6,h6,a7,b7,f7\nCounts: white king=1; queen=1; rook=2; bishop=2; knight=2; pawn=8 | black king=1; queen=1; rook=2; bishop=2; knight=2; pawn=8\nValues: white total=39; black total=39\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01671", "split": "perception", "task_type": "multi_state_tracking", "fen": "7r/1kp5/1p1pRp1r/P2R1P2/1pP3p1/6K1/2P4P/8 b - - 2 31", "prompt": "Starting FEN: 7r/1kp5/1p1pRp1r/P2R1P2/1pP3p1/6K1/2P4P/8 b - - 2 31\nAfter the moves h8e8 d5d1 h6g6, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 2\nFullmove number: 31\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 4r3/1kp5/1p1pRpr1/P4P2/1pP3p1/6K1/2P4P/3R4 w - - 5 33", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "h8e8 d5d1 h6g6", "_multi_state_tracking_result": "4r3/1kp5/1p1pRpr1/P4P2/1pP3p1/6K1/2P4P/3R4 w - - 5 33", "diagnostic": true, "hard_gate": false, "moves": "h8e8 d5d1 h6g6"}} {"example_id": "perception_01672", "split": "perception", "task_type": "board_print", "fen": "3r4/R2bq2k/4p1Rp/1p1pP3/1Pp2P2/2P4P/5Q2/4KB2 w - - 5 36", "prompt": "Position (FEN): 3r4/R2bq2k/4p1Rp/1p1pP3/1Pp2P2/2P4P/5Q2/4KB2 w - - 5 36\nShow me the board.", "gold_answer": "8 . . . r . . . .\n7 R . . b q . . k\n6 . . . . p . R p\n5 . p . p P . . .\n4 . P p . . P . .\n3 . . P . . . . P\n2 . . . . . Q . .\n1 . . . . K B . .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01673", "split": "perception", "task_type": "board_to_fen", "fen": "7r/3k3P/2p5/3p1p1R/3P1P2/4P3/3K4/8 w - - 9 71", "prompt": "Here is the current board:\n8 . . . . . . . r\n7 . . . k . . . P\n6 . . p . . . . .\n5 . . . p . p . R\n4 . . . P . P . .\n3 . . . . P . . .\n2 . . . K . . . .\n1 . . . . . . . .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 9\nFullmove number: 71\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "7r/3k3P/2p5/3p1p1R/3P1P2/4P3/3K4/8 w - - 9 71", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01674", "split": "perception", "task_type": "piece_id", "fen": "rnbqkb1r/1pp2ppp/5n2/p2p4/8/PB6/1PPP1PPP/RNBQK1NR w KQkq -", "prompt": "FEN: rnbqkb1r/1pp2ppp/5n2/p2p4/8/PB6/1PPP1PPP/RNBQK1NR w KQkq -\nWhat piece is on d5?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "d5"}} {"example_id": "perception_01675", "split": "perception", "task_type": "material_count", "fen": "b2r3r/k3qp1p/pn3np1/Nppp4/4PQ2/P1N2PPB/1PP4P/1K1RR3 b - -", "prompt": "FEN: b2r3r/k3qp1p/pn3np1/Nppp4/4PQ2/P1N2PPB/1PP4P/1K1RR3 b - -\nWhat is the material count for both sides?", "gold_answer": "White (14 pieces): 1 bishop, 1 king, 2 knights, 7 pawns, 1 queen, 2 rooks. Black (14 pieces): 1 bishop, 1 king, 2 knights, 7 pawns, 1 queen, 2 rooks. Material is equal.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01676", "split": "perception", "task_type": "square_lookup", "fen": "r2qkb1r/ppp1pp1p/2np1np1/8/2PP2b1/1P2PN2/PB3PPP/RN1QKB1R w KQkq -", "prompt": "FEN: r2qkb1r/ppp1pp1p/2np1np1/8/2PP2b1/1P2PN2/PB3PPP/RN1QKB1R w KQkq -\nWhat is on g1?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "g1=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "g1", "diagnostic": true, "hard_gate": false, "square": "g1"}} {"example_id": "perception_01677", "split": "perception", "task_type": "rank_lookup", "fen": "rnbqkb1r/p3pppp/2pp4/8/Np2n3/1B3N2/PPPPQPPP/R1B1K2R b KQkq -", "prompt": "FEN: rnbqkb1r/p3pppp/2pp4/8/Np2n3/1B3N2/PPPPQPPP/R1B1K2R b KQkq -\nWhat is the compressed FEN row for rank 7?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 7: p3pppp", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "7", "_rank_lookup_row": "p3pppp", "diagnostic": true, "hard_gate": false, "rank": "7", "fen_rank_row": "p3pppp"}} {"example_id": "perception_01678", "split": "perception", "task_type": "square_coordinates", "fen": "1r3rk1/p1p5/3p3p/2bPppp1/5P2/3P2Bq/PPPQ1P1P/R4RK1 w - -", "prompt": "FEN: 1r3rk1/p1p5/3p3p/2bPppp1/5P2/3P2Bq/PPPQ1P1P/R4RK1 w - -\nFor square d1, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "d1: file=d; rank=1; fen_row_from_top=8; file_index=4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "d1", "diagnostic": true, "hard_gate": false, "square": "d1"}} {"example_id": "perception_01679", "split": "perception", "task_type": "fen_rank_expansion", "fen": "6r1/pp3p1p/2kp4/2p5/8/2q3P1/3R1P1P/4R1K1 w - - 2 30", "prompt": "FEN: 6r1/pp3p1p/2kp4/2p5/8/2q3P1/3R1P1P/4R1K1 w - - 2 30\nCompressed rank 7 row: pp3p1p\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 7: a=p; b=p; c=1; d=1; e=1; f=p; g=1; h=p", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "7", "_fen_rank_expansion_row": "pp3p1p", "diagnostic": true, "hard_gate": false, "rank": "7", "fen_rank_row": "pp3p1p"}} {"example_id": "perception_01680", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "3r4/8/8/RP3kp1/P6p/2N1nb1P/5N2/2K5 b - - 0 37", "prompt": "Rank 5 row before: RP3kp1\nFile d changes from 1 to b. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 5: RP3kp1 -> RP1b1kp1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "f3d5", "_fen_rank_cell_edit_square": "d5", "_fen_rank_cell_edit_rank": "5", "_fen_rank_cell_edit_file": "d", "_fen_rank_cell_edit_before_row": "RP3kp1", "_fen_rank_cell_edit_after_row": "RP1b1kp1", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "b", "diagnostic": true, "hard_gate": false, "move": "f3d5", "square": "d5", "rank": "5", "file": "d", "before_row": "RP3kp1", "after_row": "RP1b1kp1", "before_fen": "1", "after_fen": "b"}} {"example_id": "perception_01681", "split": "perception", "task_type": "fen_board_edit", "fen": "r1b1r1k1/pp3p1p/3b2p1/2p4q/2B5/2B3P1/PP3P1P/R3R1K1 w - -", "prompt": "Board FEN before: r1b1r1k1/pp3p1p/3b2p1/2p4q/2B5/2B3P1/PP3P1P/R3R1K1\nApply square edits: c4 B->1; e6 1->B\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: r1b1r1k1/pp3p1p/3bB1p1/2p4q/8/2B3P1/PP3P1P/R3R1K1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "c4e6", "_fen_board_edit_board_fen_before": "r1b1r1k1/pp3p1p/3b2p1/2p4q/2B5/2B3P1/PP3P1P/R3R1K1", "_fen_board_edit_board_fen_after": "r1b1r1k1/pp3p1p/3bB1p1/2p4q/8/2B3P1/PP3P1P/R3R1K1", "_fen_board_edit_edit_text": "c4 B->1; e6 1->B", "_fen_board_edit_changed_squares": [{"square": "c4", "before": "white bishop", "after": "empty", "before_fen": "B", "after_fen": "1"}, {"square": "e6", "before": "empty", "after": "white bishop", "before_fen": "1", "after_fen": "B"}], "diagnostic": true, "hard_gate": false, "move": "c4e6", "board_fen_before": "r1b1r1k1/pp3p1p/3b2p1/2p4q/2B5/2B3P1/PP3P1P/R3R1K1", "board_fen_after": "r1b1r1k1/pp3p1p/3bB1p1/2p4q/8/2B3P1/PP3P1P/R3R1K1", "edit_text": "c4 B->1; e6 1->B", "changed_squares": [{"square": "c4", "before": "white bishop", "after": "empty", "before_fen": "B", "after_fen": "1"}, {"square": "e6", "before": "empty", "after": "white bishop", "before_fen": "1", "after_fen": "B"}]}} {"example_id": "perception_01682", "split": "perception", "task_type": "move_square_edits", "fen": "8/7p/4k3/5p2/p2bpK1P/8/8/2B5 b - - 1 43", "prompt": "Starting FEN: 8/7p/4k3/5p2/p2bpK1P/8/8/2B5 b - - 1 43\nMove: d4e5\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: d4=black bishop; e5=empty.\nSquares: d4 black bishop->empty; e5 empty->black bishop.\nRanks: rank 4 d b->1; rank 5 e 1->b.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "d4e5", "diagnostic": true, "hard_gate": false, "move": "d4e5"}} {"example_id": "perception_01683", "split": "perception", "task_type": "fen_assembly", "fen": "3r4/2p3pk/p2n3p/1p6/4R3/2P2P1P/P5K1/4R3 w - - 0 31", "prompt": "Starting FEN: 3r4/2p3pk/p2n3p/1p6/4R3/2P2P1P/P5K1/4R3 w - - 0 31\nMove: e4h4\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 31\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white rook e4h4.\nLookup: e4=white rook; h4=empty.\nSquares: e4 white rook->empty; h4 empty->white rook.\nRanks: rank 4 e R->1; rank 4 h 1->R.\nResult FEN: 3r4/2p3pk/p2n3p/1p6/7R/2P2P1P/P5K1/4R3 b - - 1 31", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "e4h4", "diagnostic": true, "hard_gate": false, "move": "e4h4"}} {"example_id": "perception_01684", "split": "perception", "task_type": "fen_row_application", "fen": "r1b1k2r/2p2p1p/p3pp2/np6/P1pP4/1qN1P3/4BPPP/2RQ1RK1 w kq -", "prompt": "Starting FEN: r1b1k2r/2p2p1p/p3pp2/np6/P1pP4/1qN1P3/4BPPP/2RQ1RK1 w kq - 0 1\nMove: f1e1\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: kq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 1 2RQ1RK1->2RQR1K1.\nResult FEN: r1b1k2r/2p2p1p/p3pp2/np6/P1pP4/1qN1P3/4BPPP/2RQR1K1 b kq - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "f1e1", "_fen_row_application_rank_rewrites": [{"rank": "1", "before": "2RQ1RK1", "after": "2RQR1K1"}], "diagnostic": true, "hard_gate": false, "move": "f1e1", "rank_rewrites": [{"rank": "1", "before": "2RQ1RK1", "after": "2RQR1K1"}]}} {"example_id": "perception_01685", "split": "perception", "task_type": "state_tracking", "fen": "r3r1k1/pq2bp2/R5p1/1p3p2/Q1pP1P2/2P4P/PP1N2P1/5RK1 w - -", "prompt": "Starting FEN: r3r1k1/pq2bp2/R5p1/1p3p2/Q1pP1P2/2P4P/PP1N2P1/5RK1 w - - 0 1\nAfter the moves a6b6, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r3r1k1/pq2bp2/1R4p1/1p3p2/Q1pP1P2/2P4P/PP1N2P1/5RK1 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "a6b6", "_state_tracking_result": "r3r1k1/pq2bp2/1R4p1/1p3p2/Q1pP1P2/2P4P/PP1N2P1/5RK1 b - - 1 1"}} {"example_id": "perception_01686", "split": "perception", "task_type": "material_inventory", "fen": "r2q1rk1/4ppbp/3p1np1/2pP1b2/1n6/1PN3P1/PB1QPPBP/R4KNR b - -", "prompt": "FEN: r2q1rk1/4ppbp/3p1np1/2pP1b2/1n6/1PN3P1/PB1QPPBP/R4KNR b - -\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=f1; queen=d2; rook=a1,h1; bishop=b2,g2; knight=g1,c3; pawn=a2,e2,f2,h2,b3,g3,d5.\nBlack inventory: king=g8; queen=d8; rook=a8,f8; bishop=f5,g7; knight=b4,f6; pawn=c5,d6,g6,e7,f7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01687", "split": "perception", "task_type": "material_piece_counts", "fen": "6k1/5p2/4n1p1/P6p/6Q1/7P/3pB1PK/4q3 w - -", "prompt": "FEN: 6k1/5p2/4n1p1/P6p/6Q1/7P/3pB1PK/4q3 w - -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=0; bishop=1; knight=0; pawn=3.\nBlack counts: king=1; queen=1; rook=0; bishop=0; knight=1; pawn=4.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01688", "split": "perception", "task_type": "material_value_totals", "fen": "r5k1/ppp2ppp/6q1/8/2P1bP2/2RP4/3KRN1P/8 w - - 4 31", "prompt": "FEN: r5k1/ppp2ppp/6q1/8/2P1bP2/2RP4/3KRN1P/8 w - - 4 31\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=10; bishop=0; knight=3; pawn=4; total=17.\nBlack values: king=0; queen=9; rook=5; bishop=3; knight=0; pawn=6; total=23.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01689", "split": "perception", "task_type": "material_balance_trace", "fen": "r7/pp2kPp1/2p2bB1/1q3P1Q/N1b5/4p3/PP4PP/4R2K b - -", "prompt": "FEN: r7/pp2kPp1/2p2bB1/1q3P1Q/N1b5/4p3/PP4PP/4R2K b - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=h1; queen=h5; rook=e1; bishop=g6; knight=a4; pawn=a2,b2,g2,h2,f5,f7 | black king=e7; queen=b5; rook=a8; bishop=c4,f6; knight=none; pawn=e3,c6,a7,b7,g7\nCounts: white king=1; queen=1; rook=1; bishop=1; knight=1; pawn=6 | black king=1; queen=1; rook=1; bishop=2; knight=0; pawn=5\nValues: white total=26; black total=25\nBalance: White is up 1 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01690", "split": "perception", "task_type": "multi_state_tracking", "fen": "r2q1bk1/1p2rpp1/p2p1nbp/2pP4/4P3/P1NB3P/1P1N1PP1/R2QR1K1 b - - 1 18", "prompt": "Starting FEN: r2q1bk1/1p2rpp1/p2p1nbp/2pP4/4P3/P1NB3P/1P1N1PP1/R2QR1K1 b - - 1 18\nAfter the moves d8a5 d3c4 f6g4, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 18\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r4bk1/1p2rpp1/p2p2bp/q1pP4/2B1P1n1/P1N4P/1P1N1PP1/R2QR1K1 w - - 4 20", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "d8a5 d3c4 f6g4", "_multi_state_tracking_result": "r4bk1/1p2rpp1/p2p2bp/q1pP4/2B1P1n1/P1N4P/1P1N1PP1/R2QR1K1 w - - 4 20", "diagnostic": true, "hard_gate": false, "moves": "d8a5 d3c4 f6g4"}} {"example_id": "perception_01691", "split": "perception", "task_type": "board_print", "fen": "8/8/8/5k2/1N1B4/3K4/8/8 w - -", "prompt": "Position (FEN): 8/8/8/5k2/1N1B4/3K4/8/8 w - -\nShow me the board.", "gold_answer": "8 . . . . . . . .\n7 . . . . . . . .\n6 . . . . . . . .\n5 . . . . . k . .\n4 . N . B . . . .\n3 . . . K . . . .\n2 . . . . . . . .\n1 . . . . . . . .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01692", "split": "perception", "task_type": "board_to_fen", "fen": "r1bq1rk1/2p2ppp/p1np1n2/1p2p3/4P3/PB1P1N1P/1PPN1PP1/R2Q1RK1 b - - 1 12", "prompt": "Here is the current board:\n8 r . b q . r k .\n7 . . p . . p p p\n6 p . n p . n . .\n5 . p . . p . . .\n4 . . . . P . . .\n3 P B . P . N . P\n2 . P P N . P P .\n1 R . . Q . R K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 12\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r1bq1rk1/2p2ppp/p1np1n2/1p2p3/4P3/PB1P1N1P/1PPN1PP1/R2Q1RK1 b - - 1 12", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01693", "split": "perception", "task_type": "piece_id", "fen": "r1bqk2r/ppp2ppp/2n5/3Np1N1/1bB5/8/PPPP1PPP/R1BQK2R b KQkq - 0 7", "prompt": "FEN: r1bqk2r/ppp2ppp/2n5/3Np1N1/1bB5/8/PPPP1PPP/R1BQK2R b KQkq - 0 7\nWhat piece is on c6?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black knight", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "c6"}} {"example_id": "perception_01694", "split": "perception", "task_type": "material_count", "fen": "r1bq1rk1/1pp1npp1/p2p3p/3Pp3/4P3/3P1N1P/PP2BPP1/R2Q1RK1 w - - 1 13", "prompt": "FEN: r1bq1rk1/1pp1npp1/p2p3p/3Pp3/4P3/3P1N1P/PP2BPP1/R2Q1RK1 w - - 1 13\nWhat is the material count for both sides?", "gold_answer": "White (14 pieces): 1 bishop, 1 king, 1 knight, 8 pawns, 1 queen, 2 rooks. Black (14 pieces): 1 bishop, 1 king, 1 knight, 8 pawns, 1 queen, 2 rooks. Material is equal.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01695", "split": "perception", "task_type": "square_lookup", "fen": "8/pp2k1p1/3nN2p/1P2pp2/7P/1B3PP1/7K/4q3 b - -", "prompt": "FEN: 8/pp2k1p1/3nN2p/1P2pp2/7P/1B3PP1/7K/4q3 b - -\nWhat is on h4?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "h4=white pawn", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "h4", "diagnostic": true, "hard_gate": false, "square": "h4"}} {"example_id": "perception_01696", "split": "perception", "task_type": "rank_lookup", "fen": "r1bqkb1r/pppp1pp1/5nn1/3Pp1Bp/2P1P2P/2N5/PP3PP1/R2QKBNR b KQkq -", "prompt": "FEN: r1bqkb1r/pppp1pp1/5nn1/3Pp1Bp/2P1P2P/2N5/PP3PP1/R2QKBNR b KQkq -\nWhat is the compressed FEN row for rank 8?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 8: r1bqkb1r", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "8", "_rank_lookup_row": "r1bqkb1r", "diagnostic": true, "hard_gate": false, "rank": "8", "fen_rank_row": "r1bqkb1r"}} {"example_id": "perception_01697", "split": "perception", "task_type": "square_coordinates", "fen": "8/8/8/5BK1/7P/8/5kP1/8 w - -", "prompt": "FEN: 8/8/8/5BK1/7P/8/5kP1/8 w - -\nFor square b5, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "b5: file=b; rank=5; fen_row_from_top=4; file_index=2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "b5", "diagnostic": true, "hard_gate": false, "square": "b5"}} {"example_id": "perception_01698", "split": "perception", "task_type": "fen_rank_expansion", "fen": "8/8/8/8/Q3K3/3p4/3k4/8 b - - 3 74", "prompt": "FEN: 8/8/8/8/Q3K3/3p4/3k4/8 b - - 3 74\nCompressed rank 3 row: 3p4\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 3: a=1; b=1; c=1; d=p; e=1; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "3", "_fen_rank_expansion_row": "3p4", "diagnostic": true, "hard_gate": false, "rank": "3", "fen_rank_row": "3p4"}} {"example_id": "perception_01699", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "rnbqkb1r/pppppp1p/8/6p1/3P1B2/8/PPPNPKPP/R2Q1BNR b kq - 0 5", "prompt": "Rank 8 row before: rnbqkb1r\nFile b changes from n to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 8: rnbqkb1r -> r1bqkb1r", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "b8a6", "_fen_rank_cell_edit_square": "b8", "_fen_rank_cell_edit_rank": "8", "_fen_rank_cell_edit_file": "b", "_fen_rank_cell_edit_before_row": "rnbqkb1r", "_fen_rank_cell_edit_after_row": "r1bqkb1r", "_fen_rank_cell_edit_before_fen": "n", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "b8a6", "square": "b8", "rank": "8", "file": "b", "before_row": "rnbqkb1r", "after_row": "r1bqkb1r", "before_fen": "n", "after_fen": "1"}} {"example_id": "perception_01700", "split": "perception", "task_type": "fen_board_edit", "fen": "8/p6p/3R1pp1/k7/2r2B2/2P5/PP3PPP/5RK1 w - - 3 26", "prompt": "Board FEN before: 8/p6p/3R1pp1/k7/2r2B2/2P5/PP3PPP/5RK1\nApply square edits: a2 P->1; a3 1->P\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 8/p6p/3R1pp1/k7/2r2B2/P1P5/1P3PPP/5RK1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "a2a3", "_fen_board_edit_board_fen_before": "8/p6p/3R1pp1/k7/2r2B2/2P5/PP3PPP/5RK1", "_fen_board_edit_board_fen_after": "8/p6p/3R1pp1/k7/2r2B2/P1P5/1P3PPP/5RK1", "_fen_board_edit_edit_text": "a2 P->1; a3 1->P", "_fen_board_edit_changed_squares": [{"square": "a2", "before": "white pawn", "after": "empty", "before_fen": "P", "after_fen": "1"}, {"square": "a3", "before": "empty", "after": "white pawn", "before_fen": "1", "after_fen": "P"}], "diagnostic": true, "hard_gate": false, "move": "a2a3", "board_fen_before": "8/p6p/3R1pp1/k7/2r2B2/2P5/PP3PPP/5RK1", "board_fen_after": "8/p6p/3R1pp1/k7/2r2B2/P1P5/1P3PPP/5RK1", "edit_text": "a2 P->1; a3 1->P", "changed_squares": [{"square": "a2", "before": "white pawn", "after": "empty", "before_fen": "P", "after_fen": "1"}, {"square": "a3", "before": "empty", "after": "white pawn", "before_fen": "1", "after_fen": "P"}]}} {"example_id": "perception_01701", "split": "perception", "task_type": "move_square_edits", "fen": "3r1k2/p2n1r2/1p1Q4/8/3p4/2P4P/PP3PP1/4R1K1 b - - 3 33", "prompt": "Starting FEN: 3r1k2/p2n1r2/1p1Q4/8/3p4/2P4P/PP3PP1/4R1K1 b - - 3 33\nMove: f8g8\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: f8=black king; g8=empty.\nSquares: f8 black king->empty; g8 empty->black king.\nRanks: rank 8 f k->1; rank 8 g 1->k.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "f8g8", "diagnostic": true, "hard_gate": false, "move": "f8g8"}} {"example_id": "perception_01702", "split": "perception", "task_type": "fen_assembly", "fen": "8/PK2q3/8/4B3/8/8/8/5k2 w - -", "prompt": "Starting FEN: 8/PK2q3/8/4B3/8/8/8/5k2 w - - 0 1\nMove: b7a8\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white king b7a8.\nLookup: b7=white king; a8=empty.\nSquares: b7 white king->empty; a8 empty->white king.\nRanks: rank 7 b K->1; rank 8 a 1->K.\nResult FEN: K7/P3q3/8/4B3/8/8/8/5k2 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "b7a8", "diagnostic": true, "hard_gate": false, "move": "b7a8"}} {"example_id": "perception_01703", "split": "perception", "task_type": "fen_row_application", "fen": "5r1k/ppnq2bp/3p2b1/3Pp1B1/1P2N3/P1N2Q2/6PP/5RK1 w - -", "prompt": "Starting FEN: 5r1k/ppnq2bp/3p2b1/3Pp1B1/1P2N3/P1N2Q2/6PP/5RK1 w - - 0 1\nMove: e4g3\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 4 1P2N3->1P6; rank 3 P1N2Q2->P1N2QN1.\nResult FEN: 5r1k/ppnq2bp/3p2b1/3Pp1B1/1P6/P1N2QN1/6PP/5RK1 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "e4g3", "_fen_row_application_rank_rewrites": [{"rank": "4", "before": "1P2N3", "after": "1P6"}, {"rank": "3", "before": "P1N2Q2", "after": "P1N2QN1"}], "diagnostic": true, "hard_gate": false, "move": "e4g3", "rank_rewrites": [{"rank": "4", "before": "1P2N3", "after": "1P6"}, {"rank": "3", "before": "P1N2Q2", "after": "P1N2QN1"}]}} {"example_id": "perception_01704", "split": "perception", "task_type": "state_tracking", "fen": "r1bq2k1/1p3pp1/2p3np/p3p3/PbB1P1P1/2N3B1/1PP1QPP1/4R1K1 w - - 0 20", "prompt": "Starting FEN: r1bq2k1/1p3pp1/2p3np/p3p3/PbB1P1P1/2N3B1/1PP1QPP1/4R1K1 w - - 0 20\nAfter the moves c3d5, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 20\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r1bq2k1/1p3pp1/2p3np/p2Np3/PbB1P1P1/6B1/1PP1QPP1/4R1K1 b - - 1 20", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "c3d5", "_state_tracking_result": "r1bq2k1/1p3pp1/2p3np/p2Np3/PbB1P1P1/6B1/1PP1QPP1/4R1K1 b - - 1 20"}} {"example_id": "perception_01705", "split": "perception", "task_type": "material_inventory", "fen": "r3kb1r/ppp2ppp/2n5/4P3/8/3P4/PP3PPP/RNB1K2R w KQkq -", "prompt": "FEN: r3kb1r/ppp2ppp/2n5/4P3/8/3P4/PP3PPP/RNB1K2R w KQkq -\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=e1; queen=none; rook=a1,h1; bishop=c1; knight=b1; pawn=a2,b2,f2,g2,h2,d3,e5.\nBlack inventory: king=e8; queen=none; rook=a8,h8; bishop=f8; knight=c6; pawn=a7,b7,c7,f7,g7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01706", "split": "perception", "task_type": "material_piece_counts", "fen": "1r4k1/p1p3pp/4pn2/3r4/4p3/B6P/PPP2PP1/R2R2K1 w - -", "prompt": "FEN: 1r4k1/p1p3pp/4pn2/3r4/4p3/B6P/PPP2PP1/R2R2K1 w - -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=2; bishop=1; knight=0; pawn=6.\nBlack counts: king=1; queen=0; rook=2; bishop=0; knight=1; pawn=6.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01707", "split": "perception", "task_type": "material_value_totals", "fen": "r1b2rk1/2pqbppp/p1n1p3/1p3n2/B7/2NP1N2/PPPB1PPP/R2Q1RK1 w - - 0 12", "prompt": "FEN: r1b2rk1/2pqbppp/p1n1p3/1p3n2/B7/2NP1N2/PPPB1PPP/R2Q1RK1 w - - 0 12\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=7; total=38.\nBlack values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=7; total=38.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01708", "split": "perception", "task_type": "material_balance_trace", "fen": "r3kb1r/2qbpp2/n1pp1np1/pp5p/3PP3/PBN1BPN1/1PP3PP/R2Q1RK1 w kq -", "prompt": "FEN: r3kb1r/2qbpp2/n1pp1np1/pp5p/3PP3/PBN1BPN1/1PP3PP/R2Q1RK1 w kq -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=d1; rook=a1,f1; bishop=b3,e3; knight=c3,g3; pawn=b2,c2,g2,h2,a3,f3,d4,e4 | black king=e8; queen=c7; rook=a8,h8; bishop=d7,f8; knight=a6,f6; pawn=a5,b5,h5,c6,d6,g6,e7,f7\nCounts: white king=1; queen=1; rook=2; bishop=2; knight=2; pawn=8 | black king=1; queen=1; rook=2; bishop=2; knight=2; pawn=8\nValues: white total=39; black total=39\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01709", "split": "perception", "task_type": "multi_state_tracking", "fen": "8/B2k1bp1/5p1p/1p1BnP1P/1P1K2P1/8/8/8 b - -", "prompt": "Starting FEN: 8/B2k1bp1/5p1p/1p1BnP1P/1P1K2P1/8/8/8 b - - 0 1\nAfter the moves d7c7 d5c4, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 8/B1k2bp1/5p1p/1p2nP1P/1PBK2P1/8/8/8 b - - 2 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "d7c7 d5c4", "_multi_state_tracking_result": "8/B1k2bp1/5p1p/1p2nP1P/1PBK2P1/8/8/8 b - - 2 2", "diagnostic": true, "hard_gate": false, "moves": "d7c7 d5c4"}} {"example_id": "perception_01710", "split": "perception", "task_type": "board_print", "fen": "rn1qkbnr/5bpp/2pp4/1p6/1p2P1P1/2N2N1P/P1P2P2/R1BQKB1R w KQkq - 0 11", "prompt": "Position (FEN): rn1qkbnr/5bpp/2pp4/1p6/1p2P1P1/2N2N1P/P1P2P2/R1BQKB1R w KQkq - 0 11\nShow me the board.", "gold_answer": "8 r n . q k b n r\n7 . . . . . b p p\n6 . . p p . . . .\n5 . p . . . . . .\n4 . p . . P . P .\n3 . . N . . N . P\n2 P . P . . P . .\n1 R . B Q K B . R\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01711", "split": "perception", "task_type": "board_to_fen", "fen": "8/8/8/2k5/8/1BB1K3/8/8 b - -", "prompt": "Here is the current board:\n8 . . . . . . . .\n7 . . . . . . . .\n6 . . . . . . . .\n5 . . k . . . . .\n4 . . . . . . . .\n3 . B B . K . . .\n2 . . . . . . . .\n1 . . . . . . . .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "8/8/8/2k5/8/1BB1K3/8/8 b - - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01712", "split": "perception", "task_type": "piece_id", "fen": "4Q3/8/1k6/2NK4/8/8/8/8 w - -", "prompt": "FEN: 4Q3/8/1k6/2NK4/8/8/8/8 w - -\nWhat piece is on e8?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white queen", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "e8"}} {"example_id": "perception_01713", "split": "perception", "task_type": "material_count", "fen": "8/3k2p1/p5b1/5pBp/P2p3P/1r3PK1/6P1/4R3 w - - 0 42", "prompt": "FEN: 8/3k2p1/p5b1/5pBp/P2p3P/1r3PK1/6P1/4R3 w - - 0 42\nWhat is the material count for both sides?", "gold_answer": "White (7 pieces): 1 bishop, 1 king, 4 pawns, 1 rook. Black (8 pieces): 1 bishop, 1 king, 5 pawns, 1 rook. Black is up 1 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01714", "split": "perception", "task_type": "square_lookup", "fen": "r1bqk2r/1p1p1ppp/p1n2b2/4p2Q/2B1P3/N7/PPP2PPP/R1B2RK1 b kq - 1 12", "prompt": "FEN: r1bqk2r/1p1p1ppp/p1n2b2/4p2Q/2B1P3/N7/PPP2PPP/R1B2RK1 b kq - 1 12\nWhat is on f8?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "f8=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "f8", "diagnostic": true, "hard_gate": false, "square": "f8"}} {"example_id": "perception_01715", "split": "perception", "task_type": "rank_lookup", "fen": "8/8/3k4/8/2Q5/4K3/8/8 b - -", "prompt": "FEN: 8/8/3k4/8/2Q5/4K3/8/8 b - -\nWhat is the compressed FEN row for rank 8?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 8: 8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "8", "_rank_lookup_row": "8", "diagnostic": true, "hard_gate": false, "rank": "8", "fen_rank_row": "8"}} {"example_id": "perception_01716", "split": "perception", "task_type": "square_coordinates", "fen": "2k5/1pp4p/p6n/4R1N1/1P4pP/2PK4/6r1/8 w - - 0 29", "prompt": "FEN: 2k5/1pp4p/p6n/4R1N1/1P4pP/2PK4/6r1/8 w - - 0 29\nFor square h7, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "h7: file=h; rank=7; fen_row_from_top=2; file_index=8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "h7", "diagnostic": true, "hard_gate": false, "square": "h7"}} {"example_id": "perception_01717", "split": "perception", "task_type": "fen_rank_expansion", "fen": "1n1r2k1/rpb2ppp/1N2b3/p1p5/P2p4/1P3B2/2P2PPP/R1BR2K1 w - -", "prompt": "FEN: 1n1r2k1/rpb2ppp/1N2b3/p1p5/P2p4/1P3B2/2P2PPP/R1BR2K1 w - -\nCompressed rank 4 row: P2p4\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 4: a=P; b=1; c=1; d=p; e=1; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "4", "_fen_rank_expansion_row": "P2p4", "diagnostic": true, "hard_gate": false, "rank": "4", "fen_rank_row": "P2p4"}} {"example_id": "perception_01718", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r5k1/p3q1rp/2n1pnpQ/1p2p1N1/3p4/P2P3P/1PP1NPP1/2KR3R w - - 4 21", "prompt": "Rank 1 row before: 2KR3R\nFile e changes from 1 to R. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 1: 2KR3R -> 2KRR3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "h1e1", "_fen_rank_cell_edit_square": "e1", "_fen_rank_cell_edit_rank": "1", "_fen_rank_cell_edit_file": "e", "_fen_rank_cell_edit_before_row": "2KR3R", "_fen_rank_cell_edit_after_row": "2KRR3", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "R", "diagnostic": true, "hard_gate": false, "move": "h1e1", "square": "e1", "rank": "1", "file": "e", "before_row": "2KR3R", "after_row": "2KRR3", "before_fen": "1", "after_fen": "R"}} {"example_id": "perception_01719", "split": "perception", "task_type": "fen_board_edit", "fen": "rnbqkb1r/ppp2ppp/4pn2/8/N1PpP3/8/PP1P1PPP/R1BQKBNR w KQkq -", "prompt": "Board FEN before: rnbqkb1r/ppp2ppp/4pn2/8/N1PpP3/8/PP1P1PPP/R1BQKBNR\nApply square edits: b2 P->1; b4 1->P\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: rnbqkb1r/ppp2ppp/4pn2/8/NPPpP3/8/P2P1PPP/R1BQKBNR", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "b2b4", "_fen_board_edit_board_fen_before": "rnbqkb1r/ppp2ppp/4pn2/8/N1PpP3/8/PP1P1PPP/R1BQKBNR", "_fen_board_edit_board_fen_after": "rnbqkb1r/ppp2ppp/4pn2/8/NPPpP3/8/P2P1PPP/R1BQKBNR", "_fen_board_edit_edit_text": "b2 P->1; b4 1->P", "_fen_board_edit_changed_squares": [{"square": "b2", "before": "white pawn", "after": "empty", "before_fen": "P", "after_fen": "1"}, {"square": "b4", "before": "empty", "after": "white pawn", "before_fen": "1", "after_fen": "P"}], "diagnostic": true, "hard_gate": false, "move": "b2b4", "board_fen_before": "rnbqkb1r/ppp2ppp/4pn2/8/N1PpP3/8/PP1P1PPP/R1BQKBNR", "board_fen_after": "rnbqkb1r/ppp2ppp/4pn2/8/NPPpP3/8/P2P1PPP/R1BQKBNR", "edit_text": "b2 P->1; b4 1->P", "changed_squares": [{"square": "b2", "before": "white pawn", "after": "empty", "before_fen": "P", "after_fen": "1"}, {"square": "b4", "before": "empty", "after": "white pawn", "before_fen": "1", "after_fen": "P"}]}} {"example_id": "perception_01720", "split": "perception", "task_type": "move_square_edits", "fen": "r3kb1r/p2bq2p/1p1p2p1/B7/3PB3/5N2/PPQ3PP/2KR3R b kq - 2 20", "prompt": "Starting FEN: r3kb1r/p2bq2p/1p1p2p1/B7/3PB3/5N2/PPQ3PP/2KR3R b kq - 2 20\nMove: e8d8\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: e8=black king; d8=empty.\nSquares: e8 black king->empty; d8 empty->black king.\nRanks: rank 8 e k->1; rank 8 d 1->k.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "e8d8", "diagnostic": true, "hard_gate": false, "move": "e8d8"}} {"example_id": "perception_01721", "split": "perception", "task_type": "fen_assembly", "fen": "r4rk1/pp3ppp/4p3/8/2p1n3/P3PN2/2P2PPP/R4RK1 w - - 0 16", "prompt": "Starting FEN: r4rk1/pp3ppp/4p3/8/2p1n3/P3PN2/2P2PPP/R4RK1 w - - 0 16\nMove: h2h4\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 16\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white pawn h2h4.\nLookup: h2=white pawn; h4=empty.\nSquares: h2 white pawn->empty; h4 empty->white pawn.\nRanks: rank 2 h P->1; rank 4 h 1->P.\nResult FEN: r4rk1/pp3ppp/4p3/8/2p1n2P/P3PN2/2P2PP1/R4RK1 b - - 0 16", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "h2h4", "diagnostic": true, "hard_gate": false, "move": "h2h4"}} {"example_id": "perception_01722", "split": "perception", "task_type": "fen_row_application", "fen": "r2qk2r/pp1n1ppp/2pbpn2/3p3b/2PP4/3BPN1P/PP1N1PP1/R1BQ1RK1 w kq -", "prompt": "Starting FEN: r2qk2r/pp1n1ppp/2pbpn2/3p3b/2PP4/3BPN1P/PP1N1PP1/R1BQ1RK1 w kq - 0 1\nMove: d1e1\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: kq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 1 R1BQ1RK1->R1B1QRK1.\nResult FEN: r2qk2r/pp1n1ppp/2pbpn2/3p3b/2PP4/3BPN1P/PP1N1PP1/R1B1QRK1 b kq - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "d1e1", "_fen_row_application_rank_rewrites": [{"rank": "1", "before": "R1BQ1RK1", "after": "R1B1QRK1"}], "diagnostic": true, "hard_gate": false, "move": "d1e1", "rank_rewrites": [{"rank": "1", "before": "R1BQ1RK1", "after": "R1B1QRK1"}]}} {"example_id": "perception_01723", "split": "perception", "task_type": "state_tracking", "fen": "1k4r1/pn2N2R/1p1p1p2/2pP3B/2P1Pp2/q1P5/5RP1/6K1 b - -", "prompt": "Starting FEN: 1k4r1/pn2N2R/1p1p1p2/2pP3B/2P1Pp2/q1P5/5RP1/6K1 b - - 0 1\nAfter the moves g8d8, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 1k1r4/pn2N2R/1p1p1p2/2pP3B/2P1Pp2/q1P5/5RP1/6K1 w - - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "g8d8", "_state_tracking_result": "1k1r4/pn2N2R/1p1p1p2/2pP3B/2P1Pp2/q1P5/5RP1/6K1 w - - 1 2"}} {"example_id": "perception_01724", "split": "perception", "task_type": "material_inventory", "fen": "8/8/6n1/5k2/3r4/6K1/8/8 b - - 9 72", "prompt": "FEN: 8/8/6n1/5k2/3r4/6K1/8/8 b - - 9 72\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g3; queen=none; rook=none; bishop=none; knight=none; pawn=none.\nBlack inventory: king=f5; queen=none; rook=d4; bishop=none; knight=g6; pawn=none.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01725", "split": "perception", "task_type": "material_piece_counts", "fen": "r2qk2r/ppp1bppp/2np1n2/4pb2/2P5/1PN2NP1/PB1PPPBP/R2QK2R b KQkq - 4 7", "prompt": "FEN: r2qk2r/ppp1bppp/2np1n2/4pb2/2P5/1PN2NP1/PB1PPPBP/R2QK2R b KQkq - 4 7\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=8.\nBlack counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=8.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01726", "split": "perception", "task_type": "material_value_totals", "fen": "3n4/kbBR2R1/p5K1/1p1p2r1/2pP2P1/P1P5/1P5P/8 w - - 5 42", "prompt": "FEN: 3n4/kbBR2R1/p5K1/1p1p2r1/2pP2P1/P1P5/1P5P/8 w - - 5 42\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=10; bishop=3; knight=0; pawn=6; total=19.\nBlack values: king=0; queen=0; rook=5; bishop=3; knight=3; pawn=4; total=15.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01727", "split": "perception", "task_type": "material_balance_trace", "fen": "r1bqr1k1/ppp2ppp/2p2n2/2b1p3/2N1P3/3P1N2/PPP1QPPP/R1B1K2R b KQ -", "prompt": "FEN: r1bqr1k1/ppp2ppp/2p2n2/2b1p3/2N1P3/3P1N2/PPP1QPPP/R1B1K2R b KQ -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=e1; queen=e2; rook=a1,h1; bishop=c1; knight=f3,c4; pawn=a2,b2,c2,f2,g2,h2,d3,e4 | black king=g8; queen=d8; rook=a8,e8; bishop=c5,c8; knight=f6; pawn=e5,c6,a7,b7,c7,f7,g7,h7\nCounts: white king=1; queen=1; rook=2; bishop=1; knight=2; pawn=8 | black king=1; queen=1; rook=2; bishop=2; knight=1; pawn=8\nValues: white total=36; black total=36\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01728", "split": "perception", "task_type": "multi_state_tracking", "fen": "2k4r/p1p2ppp/2pb4/5b2/1P6/1Nn2P2/P4KPP/R1N4R w - -", "prompt": "Starting FEN: 2k4r/p1p2ppp/2pb4/5b2/1P6/1Nn2P2/P4KPP/R1N4R w - - 0 1\nAfter the moves c1e2 c3d5 h2h3, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 2k4r/p1p2ppp/2pb4/3n1b2/1P6/1N3P1P/P3NKP1/R6R b - - 0 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "c1e2 c3d5 h2h3", "_multi_state_tracking_result": "2k4r/p1p2ppp/2pb4/3n1b2/1P6/1N3P1P/P3NKP1/R6R b - - 0 2", "diagnostic": true, "hard_gate": false, "moves": "c1e2 c3d5 h2h3"}} {"example_id": "perception_01729", "split": "perception", "task_type": "board_print", "fen": "2kr1b1r/pb4pp/1pp1p3/8/2N1p3/1P2P3/P1Q1B1PP/q3K2R w K - 0 19", "prompt": "Position (FEN): 2kr1b1r/pb4pp/1pp1p3/8/2N1p3/1P2P3/P1Q1B1PP/q3K2R w K - 0 19\nShow me the board.", "gold_answer": "8 . . k r . b . r\n7 p b . . . . p p\n6 . p p . p . . .\n5 . . . . . . . .\n4 . . N . p . . .\n3 . P . . P . . .\n2 P . Q . B . P P\n1 q . . . K . . R\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01730", "split": "perception", "task_type": "board_to_fen", "fen": "r2q1rk1/1p2nppp/1p3n2/pP2p1B1/P3P3/2P2Q1P/4NPP1/R4RK1 b - - 2 16", "prompt": "Here is the current board:\n8 r . . q . r k .\n7 . p . . n p p p\n6 . p . . . n . .\n5 p P . . p . B .\n4 P . . . P . . .\n3 . . P . . Q . P\n2 . . . . N P P .\n1 R . . . . R K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 2\nFullmove number: 16\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r2q1rk1/1p2nppp/1p3n2/pP2p1B1/P3P3/2P2Q1P/4NPP1/R4RK1 b - - 2 16", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01731", "split": "perception", "task_type": "piece_id", "fen": "5r2/8/1nk1p1N1/p2p2Np/Pn1R3P/5P2/5KP1/8 b - -", "prompt": "FEN: 5r2/8/1nk1p1N1/p2p2Np/Pn1R3P/5P2/5KP1/8 b - -\nWhat piece is on c6?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black king", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "c6"}} {"example_id": "perception_01732", "split": "perception", "task_type": "material_count", "fen": "5k2/p1p1q2p/1p2bp2/nP5N/2p5/2Q5/P4PPP/3R2K1 w - -", "prompt": "FEN: 5k2/p1p1q2p/1p2bp2/nP5N/2p5/2Q5/P4PPP/3R2K1 w - -\nWhat is the material count for both sides?", "gold_answer": "White (9 pieces): 1 king, 1 knight, 5 pawns, 1 queen, 1 rook. Black (10 pieces): 1 bishop, 1 king, 1 knight, 6 pawns, 1 queen. White is up 1 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01733", "split": "perception", "task_type": "square_lookup", "fen": "rnbqk1nr/5ppp/2p1p3/pp6/PbpPP3/2N5/1P1B1PPP/R2QKBNR w KQkq -", "prompt": "FEN: rnbqk1nr/5ppp/2p1p3/pp6/PbpPP3/2N5/1P1B1PPP/R2QKBNR w KQkq -\nWhat is on h1?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "h1=white rook", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "h1", "diagnostic": true, "hard_gate": false, "square": "h1"}} {"example_id": "perception_01734", "split": "perception", "task_type": "rank_lookup", "fen": "8/p5p1/1p1k1b2/3P4/1R4P1/8/P6P/5K2 w - -", "prompt": "FEN: 8/p5p1/1p1k1b2/3P4/1R4P1/8/P6P/5K2 w - -\nWhat is the compressed FEN row for rank 8?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 8: 8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "8", "_rank_lookup_row": "8", "diagnostic": true, "hard_gate": false, "rank": "8", "fen_rank_row": "8"}} {"example_id": "perception_01735", "split": "perception", "task_type": "square_coordinates", "fen": "4r1k1/1pp2pp1/3q3p/p3n3/2Pp4/P2Q1N2/1P3PPP/R5K1 w - - 1 20", "prompt": "FEN: 4r1k1/1pp2pp1/3q3p/p3n3/2Pp4/P2Q1N2/1P3PPP/R5K1 w - - 1 20\nFor square d5, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "d5: file=d; rank=5; fen_row_from_top=4; file_index=4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "d5", "diagnostic": true, "hard_gate": false, "square": "d5"}} {"example_id": "perception_01736", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r3k2r/1b1qb1pp/p7/1p1n1P2/2p5/2P3N1/PPBBQPPP/3RR1K1 w kq - 4 19", "prompt": "FEN: r3k2r/1b1qb1pp/p7/1p1n1P2/2p5/2P3N1/PPBBQPPP/3RR1K1 w kq - 4 19\nCompressed rank 5 row: 1p1n1P2\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 5: a=1; b=p; c=1; d=n; e=1; f=P; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "5", "_fen_rank_expansion_row": "1p1n1P2", "diagnostic": true, "hard_gate": false, "rank": "5", "fen_rank_row": "1p1n1P2"}} {"example_id": "perception_01737", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "3r1rk1/pp2b1B1/7p/6q1/8/P2B3P/1P3P2/R2Q1RK1 w - -", "prompt": "Rank 2 row before: 1P3P2\nFile h changes from 1 to K. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 2: 1P3P2 -> 1P3P1K", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "g1h2", "_fen_rank_cell_edit_square": "h2", "_fen_rank_cell_edit_rank": "2", "_fen_rank_cell_edit_file": "h", "_fen_rank_cell_edit_before_row": "1P3P2", "_fen_rank_cell_edit_after_row": "1P3P1K", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "K", "diagnostic": true, "hard_gate": false, "move": "g1h2", "square": "h2", "rank": "2", "file": "h", "before_row": "1P3P2", "after_row": "1P3P1K", "before_fen": "1", "after_fen": "K"}} {"example_id": "perception_01738", "split": "perception", "task_type": "fen_board_edit", "fen": "8/1b2kP2/5R2/8/8/8/8/5K2 b - -", "prompt": "Board FEN before: 8/1b2kP2/5R2/8/8/8/8/5K2\nApply square edits: e7 k->1; d8 1->k\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 3k4/1b3P2/5R2/8/8/8/8/5K2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "e7d8", "_fen_board_edit_board_fen_before": "8/1b2kP2/5R2/8/8/8/8/5K2", "_fen_board_edit_board_fen_after": "3k4/1b3P2/5R2/8/8/8/8/5K2", "_fen_board_edit_edit_text": "e7 k->1; d8 1->k", "_fen_board_edit_changed_squares": [{"square": "e7", "before": "black king", "after": "empty", "before_fen": "k", "after_fen": "1"}, {"square": "d8", "before": "empty", "after": "black king", "before_fen": "1", "after_fen": "k"}], "diagnostic": true, "hard_gate": false, "move": "e7d8", "board_fen_before": "8/1b2kP2/5R2/8/8/8/8/5K2", "board_fen_after": "3k4/1b3P2/5R2/8/8/8/8/5K2", "edit_text": "e7 k->1; d8 1->k", "changed_squares": [{"square": "e7", "before": "black king", "after": "empty", "before_fen": "k", "after_fen": "1"}, {"square": "d8", "before": "empty", "after": "black king", "before_fen": "1", "after_fen": "k"}]}} {"example_id": "perception_01739", "split": "perception", "task_type": "move_square_edits", "fen": "r1bqk2r/pp1nbppp/2p5/8/3NB3/7P/PPP2PP1/R1BQ1RK1 b kq -", "prompt": "Starting FEN: r1bqk2r/pp1nbppp/2p5/8/3NB3/7P/PPP2PP1/R1BQ1RK1 b kq -\nMove: c6c5\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: c6=black pawn; c5=empty.\nSquares: c6 black pawn->empty; c5 empty->black pawn.\nRanks: rank 6 c p->1; rank 5 c 1->p.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "c6c5", "diagnostic": true, "hard_gate": false, "move": "c6c5"}} {"example_id": "perception_01740", "split": "perception", "task_type": "fen_assembly", "fen": "2r1k2r/pp1bnppp/1q2p3/2b1P3/N2p4/3BBP2/PP3P1P/1R1QR1K1 b k -", "prompt": "Starting FEN: 2r1k2r/pp1bnppp/1q2p3/2b1P3/N2p4/3BBP2/PP3P1P/1R1QR1K1 b k - 0 1\nMove: f7f5\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: k\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black pawn f7f5.\nLookup: f7=black pawn; f5=empty.\nSquares: f7 black pawn->empty; f5 empty->black pawn.\nRanks: rank 7 f p->1; rank 5 f 1->p.\nResult FEN: 2r1k2r/pp1bn1pp/1q2p3/2b1Pp2/N2p4/3BBP2/PP3P1P/1R1QR1K1 w k f6 0 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "f7f5", "diagnostic": true, "hard_gate": false, "move": "f7f5"}} {"example_id": "perception_01741", "split": "perception", "task_type": "fen_row_application", "fen": "R7/p5pk/2p4p/2r1prn1/P2p4/3P3P/5PPN/4R1K1 b - - 3 32", "prompt": "Starting FEN: R7/p5pk/2p4p/2r1prn1/P2p4/3P3P/5PPN/4R1K1 b - - 3 32\nMove: g5f3\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 3\nFullmove number: 32\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 5 2r1prn1->2r1pr2; rank 3 3P3P->3P1n1P.\nResult FEN: R7/p5pk/2p4p/2r1pr2/P2p4/3P1n1P/5PPN/4R1K1 w - - 4 33", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "g5f3", "_fen_row_application_rank_rewrites": [{"rank": "5", "before": "2r1prn1", "after": "2r1pr2"}, {"rank": "3", "before": "3P3P", "after": "3P1n1P"}], "diagnostic": true, "hard_gate": false, "move": "g5f3", "rank_rewrites": [{"rank": "5", "before": "2r1prn1", "after": "2r1pr2"}, {"rank": "3", "before": "3P3P", "after": "3P1n1P"}]}} {"example_id": "perception_01742", "split": "perception", "task_type": "state_tracking", "fen": "r1b2r1k/4qp1p/p1n1pb1Q/4pP2/1p2N3/8/PPP4P/2KR1BR1 b - -", "prompt": "Starting FEN: r1b2r1k/4qp1p/p1n1pb1Q/4pP2/1p2N3/8/PPP4P/2KR1BR1 b - - 0 1\nAfter the moves e7c7, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r1b2r1k/2q2p1p/p1n1pb1Q/4pP2/1p2N3/8/PPP4P/2KR1BR1 w - - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "e7c7", "_state_tracking_result": "r1b2r1k/2q2p1p/p1n1pb1Q/4pP2/1p2N3/8/PPP4P/2KR1BR1 w - - 1 2"}} {"example_id": "perception_01743", "split": "perception", "task_type": "material_inventory", "fen": "r2b1q1r/1k1R1n2/1p2pP1p/7Q/p3N2P/4P1B1/1P2N2R/2K5 b - - 1 33", "prompt": "FEN: r2b1q1r/1k1R1n2/1p2pP1p/7Q/p3N2P/4P1B1/1P2N2R/2K5 b - - 1 33\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=c1; queen=h5; rook=h2,d7; bishop=g3; knight=e2,e4; pawn=b2,e3,h4,f6.\nBlack inventory: king=b7; queen=f8; rook=a8,h8; bishop=d8; knight=f7; pawn=a4,b6,e6,h6.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01744", "split": "perception", "task_type": "material_piece_counts", "fen": "5rk1/p1q1bpp1/2p1p1p1/2Pp2P1/3PnP2/4P2P/P3Q3/R3R1K1 b - - 0 23", "prompt": "FEN: 5rk1/p1q1bpp1/2p1p1p1/2Pp2P1/3PnP2/4P2P/P3Q3/R3R1K1 b - - 0 23\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=0; knight=0; pawn=7.\nBlack counts: king=1; queen=1; rook=1; bishop=1; knight=1; pawn=7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01745", "split": "perception", "task_type": "material_value_totals", "fen": "5rk1/2p3pp/2p2p1n/pp2p3/4P2q/PP5Q/2P2PP1/R3R1K1 b - - 0 21", "prompt": "FEN: 5rk1/2p3pp/2p2p1n/pp2p3/4P2q/PP5Q/2P2PP1/R3R1K1 b - - 0 21\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=0; knight=0; pawn=6; total=25.\nBlack values: king=0; queen=9; rook=5; bishop=0; knight=3; pawn=8; total=25.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01746", "split": "perception", "task_type": "material_balance_trace", "fen": "r5k1/pp3ppp/2p5/3n2q1/P7/1P1P1BPb/5P1P/R2QR1K1 b - - 0 20", "prompt": "FEN: r5k1/pp3ppp/2p5/3n2q1/P7/1P1P1BPb/5P1P/R2QR1K1 b - - 0 20\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=d1; rook=a1,e1; bishop=f3; knight=none; pawn=f2,h2,b3,d3,g3,a4 | black king=g8; queen=g5; rook=a8; bishop=h3; knight=d5; pawn=c6,a7,b7,f7,g7,h7\nCounts: white king=1; queen=1; rook=2; bishop=1; knight=0; pawn=6 | black king=1; queen=1; rook=1; bishop=1; knight=1; pawn=6\nValues: white total=28; black total=26\nBalance: White is up 2 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01747", "split": "perception", "task_type": "multi_state_tracking", "fen": "r2qk2r/pp1nbpp1/2pp1np1/8/8/3P1BP1/PPP1Q2P/RNB1K1NR b KQkq - 3 11", "prompt": "Starting FEN: r2qk2r/pp1nbpp1/2pp1np1/8/8/3P1BP1/PPP1Q2P/RNB1K1NR b KQkq - 3 11\nAfter the moves h8h4 e1d1, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 3\nFullmove number: 11\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r2qk3/pp1nbpp1/2pp1np1/8/7r/3P1BP1/PPP1Q2P/RNBK2NR b q - 5 12", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "h8h4 e1d1", "_multi_state_tracking_result": "r2qk3/pp1nbpp1/2pp1np1/8/7r/3P1BP1/PPP1Q2P/RNBK2NR b q - 5 12", "diagnostic": true, "hard_gate": false, "moves": "h8h4 e1d1"}} {"example_id": "perception_01748", "split": "perception", "task_type": "board_print", "fen": "8/6p1/p2N1k1p/1p2n3/1P2K3/P5P1/8/8 b - - 2 45", "prompt": "Position (FEN): 8/6p1/p2N1k1p/1p2n3/1P2K3/P5P1/8/8 b - - 2 45\nShow me the board.", "gold_answer": "8 . . . . . . . .\n7 . . . . . . p .\n6 p . . N . k . p\n5 . p . . n . . .\n4 . P . . K . . .\n3 P . . . . . P .\n2 . . . . . . . .\n1 . . . . . . . .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01749", "split": "perception", "task_type": "board_to_fen", "fen": "8/1p4kp/p7/5r2/1bp5/5n1P/P4P2/4RK2 b - - 3 34", "prompt": "Here is the current board:\n8 . . . . . . . .\n7 . p . . . . k p\n6 p . . . . . . .\n5 . . . . . r . .\n4 . b p . . . . .\n3 . . . . . n . P\n2 P . . . . P . .\n1 . . . . R K . .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 3\nFullmove number: 34\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "8/1p4kp/p7/5r2/1bp5/5n1P/P4P2/4RK2 b - - 3 34", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01750", "split": "perception", "task_type": "piece_id", "fen": "r6r/pp2nkpp/3p4/3P2B1/1P1b2Q1/P2P3P/2P3P1/4q2K w - - 1 22", "prompt": "FEN: r6r/pp2nkpp/3p4/3P2B1/1P1b2Q1/P2P3P/2P3P1/4q2K w - - 1 22\nWhat piece is on g4?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white queen", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "g4"}} {"example_id": "perception_01751", "split": "perception", "task_type": "material_count", "fen": "r1b1k2r/ppp2ppp/2n1pn2/2b5/4P3/2P2N2/PP1N1PPP/R1BBK2R b KQkq -", "prompt": "FEN: r1b1k2r/ppp2ppp/2n1pn2/2b5/4P3/2P2N2/PP1N1PPP/R1BBK2R b KQkq -\nWhat is the material count for both sides?", "gold_answer": "White (14 pieces): 2 bishops, 1 king, 2 knights, 7 pawns, 2 rooks. Black (14 pieces): 2 bishops, 1 king, 2 knights, 7 pawns, 2 rooks. Material is equal.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01752", "split": "perception", "task_type": "square_lookup", "fen": "rn2kb1r/pp2q1pp/2p5/5B2/8/4nP2/PPP3PP/R3K2R w KQkq - 0 18", "prompt": "FEN: rn2kb1r/pp2q1pp/2p5/5B2/8/4nP2/PPP3PP/R3K2R w KQkq - 0 18\nWhat is on e8?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "e8=black king", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "e8", "diagnostic": true, "hard_gate": false, "square": "e8"}} {"example_id": "perception_01753", "split": "perception", "task_type": "rank_lookup", "fen": "2r2rk1/1bqn1pp1/pN3b1p/2p5/2P1p3/P2BPN2/1B3PPP/QR3RK1 b - -", "prompt": "FEN: 2r2rk1/1bqn1pp1/pN3b1p/2p5/2P1p3/P2BPN2/1B3PPP/QR3RK1 b - -\nWhat is the compressed FEN row for rank 7?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 7: 1bqn1pp1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "7", "_rank_lookup_row": "1bqn1pp1", "diagnostic": true, "hard_gate": false, "rank": "7", "fen_rank_row": "1bqn1pp1"}} {"example_id": "perception_01754", "split": "perception", "task_type": "square_coordinates", "fen": "8/3P2pp/2Br1p2/P4k2/7P/8/4K3/8 b - -", "prompt": "FEN: 8/3P2pp/2Br1p2/P4k2/7P/8/4K3/8 b - -\nFor square d7, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "d7: file=d; rank=7; fen_row_from_top=2; file_index=4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "d7", "diagnostic": true, "hard_gate": false, "square": "d7"}} {"example_id": "perception_01755", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r3kb1r/1b3p2/pq1ppP1p/6p1/2P5/1N1Q2B1/Pp3PPP/1K1RR3 b kq -", "prompt": "FEN: r3kb1r/1b3p2/pq1ppP1p/6p1/2P5/1N1Q2B1/Pp3PPP/1K1RR3 b kq -\nCompressed rank 6 row: pq1ppP1p\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 6: a=p; b=q; c=1; d=p; e=p; f=P; g=1; h=p", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "6", "_fen_rank_expansion_row": "pq1ppP1p", "diagnostic": true, "hard_gate": false, "rank": "6", "fen_rank_row": "pq1ppP1p"}} {"example_id": "perception_01756", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r5qk/p3p1rp/1pp1bn2/3p3P/3P2P1/2P1QP2/PP1NN3/R3K2R w KQ - 0 23", "prompt": "Rank 1 row before: R3K2R\nFile a changes from R to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 1: R3K2R -> 1R2K2R", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "a1b1", "_fen_rank_cell_edit_square": "a1", "_fen_rank_cell_edit_rank": "1", "_fen_rank_cell_edit_file": "a", "_fen_rank_cell_edit_before_row": "R3K2R", "_fen_rank_cell_edit_after_row": "1R2K2R", "_fen_rank_cell_edit_before_fen": "R", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "a1b1", "square": "a1", "rank": "1", "file": "a", "before_row": "R3K2R", "after_row": "1R2K2R", "before_fen": "R", "after_fen": "1"}} {"example_id": "perception_01757", "split": "perception", "task_type": "fen_board_edit", "fen": "r2qkb1r/1p1b1ppp/p3pn2/2p1N3/8/3P4/PPP2PPP/RNBQR1K1 b kq -", "prompt": "Board FEN before: r2qkb1r/1p1b1ppp/p3pn2/2p1N3/8/3P4/PPP2PPP/RNBQR1K1\nApply square edits: g7 p->1; g6 1->p\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: r2qkb1r/1p1b1p1p/p3pnp1/2p1N3/8/3P4/PPP2PPP/RNBQR1K1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "g7g6", "_fen_board_edit_board_fen_before": "r2qkb1r/1p1b1ppp/p3pn2/2p1N3/8/3P4/PPP2PPP/RNBQR1K1", "_fen_board_edit_board_fen_after": "r2qkb1r/1p1b1p1p/p3pnp1/2p1N3/8/3P4/PPP2PPP/RNBQR1K1", "_fen_board_edit_edit_text": "g7 p->1; g6 1->p", "_fen_board_edit_changed_squares": [{"square": "g7", "before": "black pawn", "after": "empty", "before_fen": "p", "after_fen": "1"}, {"square": "g6", "before": "empty", "after": "black pawn", "before_fen": "1", "after_fen": "p"}], "diagnostic": true, "hard_gate": false, "move": "g7g6", "board_fen_before": "r2qkb1r/1p1b1ppp/p3pn2/2p1N3/8/3P4/PPP2PPP/RNBQR1K1", "board_fen_after": "r2qkb1r/1p1b1p1p/p3pnp1/2p1N3/8/3P4/PPP2PPP/RNBQR1K1", "edit_text": "g7 p->1; g6 1->p", "changed_squares": [{"square": "g7", "before": "black pawn", "after": "empty", "before_fen": "p", "after_fen": "1"}, {"square": "g6", "before": "empty", "after": "black pawn", "before_fen": "1", "after_fen": "p"}]}} {"example_id": "perception_01758", "split": "perception", "task_type": "move_square_edits", "fen": "8/8/8/4Nk2/3K4/2Q5/8/8 w - -", "prompt": "Starting FEN: 8/8/8/4Nk2/3K4/2Q5/8/8 w - -\nMove: c3f3\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: c3=white queen; f3=empty.\nSquares: c3 white queen->empty; f3 empty->white queen.\nRanks: rank 3 c Q->1; rank 3 f 1->Q.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "c3f3", "diagnostic": true, "hard_gate": false, "move": "c3f3"}} {"example_id": "perception_01759", "split": "perception", "task_type": "fen_assembly", "fen": "2kr3r/pbpp4/1p2p1n1/7p/3PP3/2NN1q2/PPPQ4/2KR1R2 b - - 1 19", "prompt": "Starting FEN: 2kr3r/pbpp4/1p2p1n1/7p/3PP3/2NN1q2/PPPQ4/2KR1R2 b - - 1 19\nMove: e6e5\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 19\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black pawn e6e5.\nLookup: e6=black pawn; e5=empty.\nSquares: e6 black pawn->empty; e5 empty->black pawn.\nRanks: rank 6 e p->1; rank 5 e 1->p.\nResult FEN: 2kr3r/pbpp4/1p4n1/4p2p/3PP3/2NN1q2/PPPQ4/2KR1R2 w - - 0 20", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "e6e5", "diagnostic": true, "hard_gate": false, "move": "e6e5"}} {"example_id": "perception_01760", "split": "perception", "task_type": "fen_row_application", "fen": "rn1qkb1r/pbp2ppp/1p6/8/3pP3/2P2N2/P1Q2PPP/R1B1KB1R w KQkq -", "prompt": "Starting FEN: rn1qkb1r/pbp2ppp/1p6/8/3pP3/2P2N2/P1Q2PPP/R1B1KB1R w KQkq - 0 1\nMove: c1a3\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 1 R1B1KB1R->R3KB1R; rank 3 2P2N2->B1P2N2.\nResult FEN: rn1qkb1r/pbp2ppp/1p6/8/3pP3/B1P2N2/P1Q2PPP/R3KB1R b KQkq - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "c1a3", "_fen_row_application_rank_rewrites": [{"rank": "1", "before": "R1B1KB1R", "after": "R3KB1R"}, {"rank": "3", "before": "2P2N2", "after": "B1P2N2"}], "diagnostic": true, "hard_gate": false, "move": "c1a3", "rank_rewrites": [{"rank": "1", "before": "R1B1KB1R", "after": "R3KB1R"}, {"rank": "3", "before": "2P2N2", "after": "B1P2N2"}]}} {"example_id": "perception_01761", "split": "perception", "task_type": "state_tracking", "fen": "r5k1/5pp1/p1q1p3/2b1B1p1/4R3/1P3Q2/P2r1P1P/4R1K1 w - - 2 27", "prompt": "Starting FEN: r5k1/5pp1/p1q1p3/2b1B1p1/4R3/1P3Q2/P2r1P1P/4R1K1 w - - 2 27\nAfter the moves e1f1, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 2\nFullmove number: 27\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r5k1/5pp1/p1q1p3/2b1B1p1/4R3/1P3Q2/P2r1P1P/5RK1 b - - 3 27", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "e1f1", "_state_tracking_result": "r5k1/5pp1/p1q1p3/2b1B1p1/4R3/1P3Q2/P2r1P1P/5RK1 b - - 3 27"}} {"example_id": "perception_01762", "split": "perception", "task_type": "material_inventory", "fen": "r1br2k1/1p3pbp/pq2p1p1/8/3P4/1P2QN2/P3BPPP/R2R2K1 b - -", "prompt": "FEN: r1br2k1/1p3pbp/pq2p1p1/8/3P4/1P2QN2/P3BPPP/R2R2K1 b - -\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=e3; rook=a1,d1; bishop=e2; knight=f3; pawn=a2,f2,g2,h2,b3,d4.\nBlack inventory: king=g8; queen=b6; rook=a8,d8; bishop=g7,c8; knight=none; pawn=a6,e6,g6,b7,f7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01763", "split": "perception", "task_type": "material_piece_counts", "fen": "rn1qk2r/pb1p1ppp/1p2pn2/2p5/1bPPP3/2NB4/PPQ2PPP/R1B1K1NR w KQkq -", "prompt": "FEN: rn1qk2r/pb1p1ppp/1p2pn2/2p5/1bPPP3/2NB4/PPQ2PPP/R1B1K1NR w KQkq -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=8.\nBlack counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=8.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01764", "split": "perception", "task_type": "material_value_totals", "fen": "r1bqkb1r/pp2pp1p/2np1np1/2p5/4P3/1P1P1N1P/PBP2PP1/RN1QKB1R b KQkq - 1 6", "prompt": "FEN: r1bqkb1r/pp2pp1p/2np1np1/2p5/4P3/1P1P1N1P/PBP2PP1/RN1QKB1R b KQkq - 1 6\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=8; total=39.\nBlack values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=8; total=39.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01765", "split": "perception", "task_type": "material_balance_trace", "fen": "8/8/8/4K3/4Q3/8/3p1k2/8 w - -", "prompt": "FEN: 8/8/8/4K3/4Q3/8/3p1k2/8 w - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=e5; queen=e4; rook=none; bishop=none; knight=none; pawn=none | black king=f2; queen=none; rook=none; bishop=none; knight=none; pawn=d2\nCounts: white king=1; queen=1; rook=0; bishop=0; knight=0; pawn=0 | black king=1; queen=0; rook=0; bishop=0; knight=0; pawn=1\nValues: white total=9; black total=1\nBalance: White is up 8 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01766", "split": "perception", "task_type": "multi_state_tracking", "fen": "5bk1/5p1p/6pP/1p3rP1/p1b5/P1P1B3/1P1K1R2/8 w - - 0 39", "prompt": "Starting FEN: 5bk1/5p1p/6pP/1p3rP1/p1b5/P1P1B3/1P1K1R2/8 w - - 0 39\nAfter the moves e3c5 f7f6, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 39\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 5bk1/7p/5ppP/1pB2rP1/p1b5/P1P5/1P1K1R2/8 w - - 0 40", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "e3c5 f7f6", "_multi_state_tracking_result": "5bk1/7p/5ppP/1pB2rP1/p1b5/P1P5/1P1K1R2/8 w - - 0 40", "diagnostic": true, "hard_gate": false, "moves": "e3c5 f7f6"}} {"example_id": "perception_01767", "split": "perception", "task_type": "board_print", "fen": "3q1rk1/3n1p2/r2b3p/pRp3p1/2PpP3/3P2B1/P1Q1BPPP/5RK1 b - - 5 23", "prompt": "Position (FEN): 3q1rk1/3n1p2/r2b3p/pRp3p1/2PpP3/3P2B1/P1Q1BPPP/5RK1 b - - 5 23\nShow me the board.", "gold_answer": "8 . . . q . r k .\n7 . . . n . p . .\n6 r . . b . . . p\n5 p R p . . . p .\n4 . . P p P . . .\n3 . . . P . . B .\n2 P . Q . B P P P\n1 . . . . . R K .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01768", "split": "perception", "task_type": "board_to_fen", "fen": "r1bqk2r/ppppb1pp/2n5/3N4/3pQ3/8/PPP2PPP/R1B1KB1R b KQkq -", "prompt": "Here is the current board:\n8 r . b q k . . r\n7 p p p p b . p p\n6 . . n . . . . .\n5 . . . N . . . .\n4 . . . p Q . . .\n3 . . . . . . . .\n2 P P P . . P P P\n1 R . B . K B . R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r1bqk2r/ppppb1pp/2n5/3N4/3pQ3/8/PPP2PPP/R1B1KB1R b KQkq - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01769", "split": "perception", "task_type": "piece_id", "fen": "8/5p2/8/5p1k/1p5P/1P3K2/5P2/8 w - -", "prompt": "FEN: 8/5p2/8/5p1k/1p5P/1P3K2/5P2/8 w - -\nWhat piece is on h5?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black king", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "h5"}} {"example_id": "perception_01770", "split": "perception", "task_type": "material_count", "fen": "rn1qkbnr/p1p2ppp/1p2p3/3p1b2/2PP4/1Q3N2/PP2PPPP/RNB1KB1R b KQkq -", "prompt": "FEN: rn1qkbnr/p1p2ppp/1p2p3/3p1b2/2PP4/1Q3N2/PP2PPPP/RNB1KB1R b KQkq -\nWhat is the material count for both sides?", "gold_answer": "White (16 pieces): 2 bishops, 1 king, 2 knights, 8 pawns, 1 queen, 2 rooks. Black (16 pieces): 2 bishops, 1 king, 2 knights, 8 pawns, 1 queen, 2 rooks. Material is equal.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01771", "split": "perception", "task_type": "square_lookup", "fen": "r6r/ppk1q1bp/2pp1p1n/4p1pB/4P3/2PP1Q2/PP3PPP/R1B2RK1 w - - 2 23", "prompt": "FEN: r6r/ppk1q1bp/2pp1p1n/4p1pB/4P3/2PP1Q2/PP3PPP/R1B2RK1 w - - 2 23\nWhat is on h7?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "h7=black pawn", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "h7", "diagnostic": true, "hard_gate": false, "square": "h7"}} {"example_id": "perception_01772", "split": "perception", "task_type": "rank_lookup", "fen": "rn2k1nr/1pp2ppp/p7/4qN2/3N4/7P/PPPQBPP1/R3K2R w KQkq - 2 15", "prompt": "FEN: rn2k1nr/1pp2ppp/p7/4qN2/3N4/7P/PPPQBPP1/R3K2R w KQkq - 2 15\nWhat is the compressed FEN row for rank 3?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 3: 7P", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "3", "_rank_lookup_row": "7P", "diagnostic": true, "hard_gate": false, "rank": "3", "fen_rank_row": "7P"}} {"example_id": "perception_01773", "split": "perception", "task_type": "square_coordinates", "fen": "8/1pp2k2/p2p4/5p1p/PbP1K3/1P4P1/1B6/8 w - - 0 36", "prompt": "FEN: 8/1pp2k2/p2p4/5p1p/PbP1K3/1P4P1/1B6/8 w - - 0 36\nFor square c2, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "c2: file=c; rank=2; fen_row_from_top=7; file_index=3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "c2", "diagnostic": true, "hard_gate": false, "square": "c2"}} {"example_id": "perception_01774", "split": "perception", "task_type": "fen_rank_expansion", "fen": "2kr2nr/pbpqb1pp/1p2p3/5p2/3P4/2N3N1/PPP1QPPP/R1B2RK1 b - - 3 11", "prompt": "FEN: 2kr2nr/pbpqb1pp/1p2p3/5p2/3P4/2N3N1/PPP1QPPP/R1B2RK1 b - - 3 11\nCompressed rank 8 row: 2kr2nr\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 8: a=1; b=1; c=k; d=r; e=1; f=1; g=n; h=r", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "8", "_fen_rank_expansion_row": "2kr2nr", "diagnostic": true, "hard_gate": false, "rank": "8", "fen_rank_row": "2kr2nr"}} {"example_id": "perception_01775", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "2b2qkr/bpN4p/p2p2p1/4pPN1/4P3/3PB3/PP4PP/3Q1K1R b - - 0 19", "prompt": "Rank 8 row before: 2b2qkr\nFile f changes from q to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 8: 2b2qkr -> 2b1q1kr", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "f8e8", "_fen_rank_cell_edit_square": "f8", "_fen_rank_cell_edit_rank": "8", "_fen_rank_cell_edit_file": "f", "_fen_rank_cell_edit_before_row": "2b2qkr", "_fen_rank_cell_edit_after_row": "2b1q1kr", "_fen_rank_cell_edit_before_fen": "q", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "f8e8", "square": "f8", "rank": "8", "file": "f", "before_row": "2b2qkr", "after_row": "2b1q1kr", "before_fen": "q", "after_fen": "1"}} {"example_id": "perception_01776", "split": "perception", "task_type": "fen_board_edit", "fen": "1k4rr/1pp2p2/pb6/3Pp3/4P1p1/1P2PB2/P3R1P1/2R1K3 w - - 0 26", "prompt": "Board FEN before: 1k4rr/1pp2p2/pb6/3Pp3/4P1p1/1P2PB2/P3R1P1/2R1K3\nApply square edits: e2 R->1; d2 1->R\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 1k4rr/1pp2p2/pb6/3Pp3/4P1p1/1P2PB2/P2R2P1/2R1K3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "e2d2", "_fen_board_edit_board_fen_before": "1k4rr/1pp2p2/pb6/3Pp3/4P1p1/1P2PB2/P3R1P1/2R1K3", "_fen_board_edit_board_fen_after": "1k4rr/1pp2p2/pb6/3Pp3/4P1p1/1P2PB2/P2R2P1/2R1K3", "_fen_board_edit_edit_text": "e2 R->1; d2 1->R", "_fen_board_edit_changed_squares": [{"square": "e2", "before": "white rook", "after": "empty", "before_fen": "R", "after_fen": "1"}, {"square": "d2", "before": "empty", "after": "white rook", "before_fen": "1", "after_fen": "R"}], "diagnostic": true, "hard_gate": false, "move": "e2d2", "board_fen_before": "1k4rr/1pp2p2/pb6/3Pp3/4P1p1/1P2PB2/P3R1P1/2R1K3", "board_fen_after": "1k4rr/1pp2p2/pb6/3Pp3/4P1p1/1P2PB2/P2R2P1/2R1K3", "edit_text": "e2 R->1; d2 1->R", "changed_squares": [{"square": "e2", "before": "white rook", "after": "empty", "before_fen": "R", "after_fen": "1"}, {"square": "d2", "before": "empty", "after": "white rook", "before_fen": "1", "after_fen": "R"}]}} {"example_id": "perception_01777", "split": "perception", "task_type": "move_square_edits", "fen": "2kr3r/pp3ppp/8/4R3/1b6/2P5/P1Pq1PPP/R5K1 w - - 0 18", "prompt": "Starting FEN: 2kr3r/pp3ppp/8/4R3/1b6/2P5/P1Pq1PPP/R5K1 w - - 0 18\nMove: e5c5\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: e5=white rook; c5=empty.\nSquares: e5 white rook->empty; c5 empty->white rook.\nRanks: rank 5 e R->1; rank 5 c 1->R.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "e5c5", "diagnostic": true, "hard_gate": false, "move": "e5c5"}} {"example_id": "perception_01778", "split": "perception", "task_type": "fen_assembly", "fen": "4r3/1p6/pR2P3/P7/1PpBK3/1k1n4/8/8 b - -", "prompt": "Starting FEN: 4r3/1p6/pR2P3/P7/1PpBK3/1k1n4/8/8 b - - 0 1\nMove: b3a2\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black king b3a2.\nLookup: b3=black king; a2=empty.\nSquares: b3 black king->empty; a2 empty->black king.\nRanks: rank 3 b k->1; rank 2 a 1->k.\nResult FEN: 4r3/1p6/pR2P3/P7/1PpBK3/3n4/k7/8 w - - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "b3a2", "diagnostic": true, "hard_gate": false, "move": "b3a2"}} {"example_id": "perception_01779", "split": "perception", "task_type": "fen_row_application", "fen": "7r/1p6/pPp5/P1Pp1pk1/3P3p/4P2K/8/4B3 w - - 1 43", "prompt": "Starting FEN: 7r/1p6/pPp5/P1Pp1pk1/3P3p/4P2K/8/4B3 w - - 1 43\nMove: e1c3\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 43\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 1 4B3->8; rank 3 4P2K->2B1P2K.\nResult FEN: 7r/1p6/pPp5/P1Pp1pk1/3P3p/2B1P2K/8/8 b - - 2 43", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "e1c3", "_fen_row_application_rank_rewrites": [{"rank": "1", "before": "4B3", "after": "8"}, {"rank": "3", "before": "4P2K", "after": "2B1P2K"}], "diagnostic": true, "hard_gate": false, "move": "e1c3", "rank_rewrites": [{"rank": "1", "before": "4B3", "after": "8"}, {"rank": "3", "before": "4P2K", "after": "2B1P2K"}]}} {"example_id": "perception_01780", "split": "perception", "task_type": "state_tracking", "fen": "7r/pp3k2/2b2P2/2bNp3/4P3/P6r/1PPR3P/5R1K b - - 2 30", "prompt": "Starting FEN: 7r/pp3k2/2b2P2/2bNp3/4P3/P6r/1PPR3P/5R1K b - - 2 30\nAfter the moves c5b6, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 2\nFullmove number: 30\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 7r/pp3k2/1bb2P2/3Np3/4P3/P6r/1PPR3P/5R1K w - - 3 31", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "c5b6", "_state_tracking_result": "7r/pp3k2/1bb2P2/3Np3/4P3/P6r/1PPR3P/5R1K w - - 3 31"}} {"example_id": "perception_01781", "split": "perception", "task_type": "material_inventory", "fen": "8/7p/1pbp1kp1/p2p1p2/3P1K2/3B4/PPP2PPP/8 w - - 0 29", "prompt": "FEN: 8/7p/1pbp1kp1/p2p1p2/3P1K2/3B4/PPP2PPP/8 w - - 0 29\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=f4; queen=none; rook=none; bishop=d3; knight=none; pawn=a2,b2,c2,f2,g2,h2,d4.\nBlack inventory: king=f6; queen=none; rook=none; bishop=c6; knight=none; pawn=a5,d5,f5,b6,d6,g6,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01782", "split": "perception", "task_type": "material_piece_counts", "fen": "rnb3k1/ppp3pp/3bp3/3P4/8/3QB1P1/PPP1N1P1/2K2q2 w - - 0 15", "prompt": "FEN: rnb3k1/ppp3pp/3bp3/3P4/8/3QB1P1/PPP1N1P1/2K2q2 w - - 0 15\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=0; bishop=1; knight=1; pawn=6.\nBlack counts: king=1; queen=1; rook=1; bishop=2; knight=1; pawn=6.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01783", "split": "perception", "task_type": "material_value_totals", "fen": "rn2kbnr/pbpp2q1/1p2pp2/3P2pp/2B1P3/2N2N1P/PPP2PP1/R1BQ1RK1 w kq - 2 9", "prompt": "FEN: rn2kbnr/pbpp2q1/1p2pp2/3P2pp/2B1P3/2N2N1P/PPP2PP1/R1BQ1RK1 w kq - 2 9\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=8; total=39.\nBlack values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=8; total=39.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01784", "split": "perception", "task_type": "material_balance_trace", "fen": "4r1k1/5pp1/2p2q2/1p1p3p/1P1P1N2/4r1PN/2Q2K2/1R6 w - -", "prompt": "FEN: 4r1k1/5pp1/2p2q2/1p1p3p/1P1P1N2/4r1PN/2Q2K2/1R6 w - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=f2; queen=c2; rook=b1; bishop=none; knight=h3,f4; pawn=g3,b4,d4 | black king=g8; queen=f6; rook=e3,e8; bishop=none; knight=none; pawn=b5,d5,h5,c6,f7,g7\nCounts: white king=1; queen=1; rook=1; bishop=0; knight=2; pawn=3 | black king=1; queen=1; rook=2; bishop=0; knight=0; pawn=6\nValues: white total=23; black total=25\nBalance: Black is up 2 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01785", "split": "perception", "task_type": "multi_state_tracking", "fen": "2q3k1/6p1/1Q1Prp1p/2p5/8/1P4BP/1PP2PPK/8 b - - 0 36", "prompt": "Starting FEN: 2q3k1/6p1/1Q1Prp1p/2p5/8/1P4BP/1PP2PPK/8 b - - 0 36\nAfter the moves e6e3 b6a7, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 36\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 2q3k1/Q5p1/3P1p1p/2p5/8/1P2r1BP/1PP2PPK/8 b - - 2 37", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "e6e3 b6a7", "_multi_state_tracking_result": "2q3k1/Q5p1/3P1p1p/2p5/8/1P2r1BP/1PP2PPK/8 b - - 2 37", "diagnostic": true, "hard_gate": false, "moves": "e6e3 b6a7"}} {"example_id": "perception_01786", "split": "perception", "task_type": "board_print", "fen": "rnb2rk1/ppqpppbp/5np1/8/8/2PBPN2/PP1N1PPP/R1BQ1RK1 b - - 7 9", "prompt": "Position (FEN): rnb2rk1/ppqpppbp/5np1/8/8/2PBPN2/PP1N1PPP/R1BQ1RK1 b - - 7 9\nShow me the board.", "gold_answer": "8 r n b . . r k .\n7 p p q p p p b p\n6 . . . . . n p .\n5 . . . . . . . .\n4 . . . . . . . .\n3 . . P B P N . .\n2 P P . N . P P P\n1 R . B Q . R K .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01787", "split": "perception", "task_type": "board_to_fen", "fen": "r1b2rk1/pp1n1pp1/2n1pb1p/q2p4/3P4/2N1PNB1/PPB2PPP/R2QK2R w KQ -", "prompt": "Here is the current board:\n8 r . b . . r k .\n7 p p . n . p p .\n6 . . n . p b . p\n5 q . . p . . . .\n4 . . . P . . . .\n3 . . N . P N B .\n2 P P B . . P P P\n1 R . . Q K . . R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r1b2rk1/pp1n1pp1/2n1pb1p/q2p4/3P4/2N1PNB1/PPB2PPP/R2QK2R w KQ - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01788", "split": "perception", "task_type": "piece_id", "fen": "1rbq1r1k/3n2pp/p1B2b2/2p5/1p3P2/3P2PP/PPPBN2K/1R1QR3 b - -", "prompt": "FEN: 1rbq1r1k/3n2pp/p1B2b2/2p5/1p3P2/3P2PP/PPPBN2K/1R1QR3 b - -\nWhat piece is on b8?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black rook", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "b8"}} {"example_id": "perception_01789", "split": "perception", "task_type": "material_count", "fen": "8/5kpp/8/p3KPP1/P7/8/8/8 b - - 0 50", "prompt": "FEN: 8/5kpp/8/p3KPP1/P7/8/8/8 b - - 0 50\nWhat is the material count for both sides?", "gold_answer": "White (4 pieces): 1 king, 3 pawns. Black (4 pieces): 1 king, 3 pawns. Material is equal.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01790", "split": "perception", "task_type": "square_lookup", "fen": "r1b1r3/pp1k3p/3p2p1/5n2/2Bn4/2Q5/PPP2PPP/RN4K1 w - - 3 19", "prompt": "FEN: r1b1r3/pp1k3p/3p2p1/5n2/2Bn4/2Q5/PPP2PPP/RN4K1 w - - 3 19\nWhat is on d4?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "d4=black knight", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "d4", "diagnostic": true, "hard_gate": false, "square": "d4"}} {"example_id": "perception_01791", "split": "perception", "task_type": "rank_lookup", "fen": "8/8/8/5BK1/1k6/1N6/8/8 w - -", "prompt": "FEN: 8/8/8/5BK1/1k6/1N6/8/8 w - -\nWhat is the compressed FEN row for rank 6?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 6: 8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "6", "_rank_lookup_row": "8", "diagnostic": true, "hard_gate": false, "rank": "6", "fen_rank_row": "8"}} {"example_id": "perception_01792", "split": "perception", "task_type": "square_coordinates", "fen": "r2q1rk1/1pp2p1b/p2p2p1/4p1n1/4P3/2PPB1N1/PPB1QP2/2K4R w - - 0 23", "prompt": "FEN: r2q1rk1/1pp2p1b/p2p2p1/4p1n1/4P3/2PPB1N1/PPB1QP2/2K4R w - - 0 23\nFor square a2, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "a2: file=a; rank=2; fen_row_from_top=7; file_index=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "a2", "diagnostic": true, "hard_gate": false, "square": "a2"}} {"example_id": "perception_01793", "split": "perception", "task_type": "fen_rank_expansion", "fen": "8/8/8/1P5p/5K2/1k5P/8/2r5 b - -", "prompt": "FEN: 8/8/8/1P5p/5K2/1k5P/8/2r5 b - -\nCompressed rank 3 row: 1k5P\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 3: a=1; b=k; c=1; d=1; e=1; f=1; g=1; h=P", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "3", "_fen_rank_expansion_row": "1k5P", "diagnostic": true, "hard_gate": false, "rank": "3", "fen_rank_row": "1k5P"}} {"example_id": "perception_01794", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "r1b2rk1/p1q2pbp/1pn1pnp1/2p5/P3P3/2P2NP1/1PQN1PBP/R1B1R1K1 b - - 0 12", "prompt": "Rank 5 row before: 2p5\nFile g changes from 1 to p. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 5: 2p5 -> 2p3p1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "g6g5", "_fen_rank_cell_edit_square": "g5", "_fen_rank_cell_edit_rank": "5", "_fen_rank_cell_edit_file": "g", "_fen_rank_cell_edit_before_row": "2p5", "_fen_rank_cell_edit_after_row": "2p3p1", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "p", "diagnostic": true, "hard_gate": false, "move": "g6g5", "square": "g5", "rank": "5", "file": "g", "before_row": "2p5", "after_row": "2p3p1", "before_fen": "1", "after_fen": "p"}} {"example_id": "perception_01795", "split": "perception", "task_type": "fen_board_edit", "fen": "r2qk2r/ppp2ppp/2nbbn2/8/4pP2/1P2P1P1/PBP3BP/RN1QK1NR w KQkq - 0 9", "prompt": "Board FEN before: r2qk2r/ppp2ppp/2nbbn2/8/4pP2/1P2P1P1/PBP3BP/RN1QK1NR\nApply square edits: d1 Q->1; d2 1->Q\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: r2qk2r/ppp2ppp/2nbbn2/8/4pP2/1P2P1P1/PBPQ2BP/RN2K1NR", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "d1d2", "_fen_board_edit_board_fen_before": "r2qk2r/ppp2ppp/2nbbn2/8/4pP2/1P2P1P1/PBP3BP/RN1QK1NR", "_fen_board_edit_board_fen_after": "r2qk2r/ppp2ppp/2nbbn2/8/4pP2/1P2P1P1/PBPQ2BP/RN2K1NR", "_fen_board_edit_edit_text": "d1 Q->1; d2 1->Q", "_fen_board_edit_changed_squares": [{"square": "d1", "before": "white queen", "after": "empty", "before_fen": "Q", "after_fen": "1"}, {"square": "d2", "before": "empty", "after": "white queen", "before_fen": "1", "after_fen": "Q"}], "diagnostic": true, "hard_gate": false, "move": "d1d2", "board_fen_before": "r2qk2r/ppp2ppp/2nbbn2/8/4pP2/1P2P1P1/PBP3BP/RN1QK1NR", "board_fen_after": "r2qk2r/ppp2ppp/2nbbn2/8/4pP2/1P2P1P1/PBPQ2BP/RN2K1NR", "edit_text": "d1 Q->1; d2 1->Q", "changed_squares": [{"square": "d1", "before": "white queen", "after": "empty", "before_fen": "Q", "after_fen": "1"}, {"square": "d2", "before": "empty", "after": "white queen", "before_fen": "1", "after_fen": "Q"}]}} {"example_id": "perception_01796", "split": "perception", "task_type": "move_square_edits", "fen": "R7/5p1k/5p1p/5P2/6KP/6P1/p7/r7 b - - 0 34", "prompt": "Starting FEN: R7/5p1k/5p1p/5P2/6KP/6P1/p7/r7 b - - 0 34\nMove: a1d1\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: a1=black rook; d1=empty.\nSquares: a1 black rook->empty; d1 empty->black rook.\nRanks: rank 1 a r->1; rank 1 d 1->r.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "a1d1", "diagnostic": true, "hard_gate": false, "move": "a1d1"}} {"example_id": "perception_01797", "split": "perception", "task_type": "fen_assembly", "fen": "r2q1rk1/pbp2ppp/8/1p6/3b4/1B1P2QP/PPP2nPK/RNB1R3 b - -", "prompt": "Starting FEN: r2q1rk1/pbp2ppp/8/1p6/3b4/1B1P2QP/PPP2nPK/RNB1R3 b - - 0 1\nMove: c7c5\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black pawn c7c5.\nLookup: c7=black pawn; c5=empty.\nSquares: c7 black pawn->empty; c5 empty->black pawn.\nRanks: rank 7 c p->1; rank 5 c 1->p.\nResult FEN: r2q1rk1/pb3ppp/8/1pp5/3b4/1B1P2QP/PPP2nPK/RNB1R3 w - - 0 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "c7c5", "diagnostic": true, "hard_gate": false, "move": "c7c5"}} {"example_id": "perception_01798", "split": "perception", "task_type": "fen_row_application", "fen": "4rrk1/ppBbqn1p/2n2b1P/1N1p2p1/3p4/5NP1/PP2BP2/R2QR1K1 w - -", "prompt": "Starting FEN: 4rrk1/ppBbqn1p/2n2b1P/1N1p2p1/3p4/5NP1/PP2BP2/R2QR1K1 w - - 0 1\nMove: f3d2\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 3 5NP1->6P1; rank 2 PP2BP2->PP1NBP2.\nResult FEN: 4rrk1/ppBbqn1p/2n2b1P/1N1p2p1/3p4/6P1/PP1NBP2/R2QR1K1 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "f3d2", "_fen_row_application_rank_rewrites": [{"rank": "3", "before": "5NP1", "after": "6P1"}, {"rank": "2", "before": "PP2BP2", "after": "PP1NBP2"}], "diagnostic": true, "hard_gate": false, "move": "f3d2", "rank_rewrites": [{"rank": "3", "before": "5NP1", "after": "6P1"}, {"rank": "2", "before": "PP2BP2", "after": "PP1NBP2"}]}} {"example_id": "perception_01799", "split": "perception", "task_type": "state_tracking", "fen": "8/8/4k3/6R1/8/8/5R2/2K5 w - -", "prompt": "Starting FEN: 8/8/4k3/6R1/8/8/5R2/2K5 w - - 0 1\nAfter the moves g5c5, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 8/8/4k3/2R5/8/8/5R2/2K5 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "g5c5", "_state_tracking_result": "8/8/4k3/2R5/8/8/5R2/2K5 b - - 1 1"}} {"example_id": "perception_01800", "split": "perception", "task_type": "material_inventory", "fen": "2kr2nr/pbppq1b1/np3p2/4p1pp/2P5/P1NPPNPP/1P3PB1/R1BQ1RK1 w - - 3 11", "prompt": "FEN: 2kr2nr/pbppq1b1/np3p2/4p1pp/2P5/P1NPPNPP/1P3PB1/R1BQ1RK1 w - - 3 11\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=d1; rook=a1,f1; bishop=c1,g2; knight=c3,f3; pawn=b2,f2,a3,d3,e3,g3,h3,c4.\nBlack inventory: king=c8; queen=e7; rook=d8,h8; bishop=b7,g7; knight=a6,g8; pawn=e5,g5,h5,b6,f6,a7,c7,d7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01801", "split": "perception", "task_type": "material_piece_counts", "fen": "r4rk1/p2n2p1/2p1p2p/qp2p3/3pP3/P2P1N1P/1PP1QPP1/2K2R1R w - - 4 17", "prompt": "FEN: r4rk1/p2n2p1/2p1p2p/qp2p3/3pP3/P2P1N1P/1PP1QPP1/2K2R1R w - - 4 17\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=0; knight=1; pawn=8.\nBlack counts: king=1; queen=1; rook=2; bishop=0; knight=1; pawn=8.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01802", "split": "perception", "task_type": "material_value_totals", "fen": "7k/8/5K2/8/7N/1B6/8/8 b - -", "prompt": "FEN: 7k/8/5K2/8/7N/1B6/8/8 b - -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=0; bishop=3; knight=3; pawn=0; total=6.\nBlack values: king=0; queen=0; rook=0; bishop=0; knight=0; pawn=0; total=0.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01803", "split": "perception", "task_type": "material_balance_trace", "fen": "7r/2p2p2/3k3p/3p1bp1/1Q6/3P1P2/1PP2P1P/5RK1 b - - 0 25", "prompt": "FEN: 7r/2p2p2/3k3p/3p1bp1/1Q6/3P1P2/1PP2P1P/5RK1 b - - 0 25\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=b4; rook=f1; bishop=none; knight=none; pawn=b2,c2,f2,h2,d3,f3 | black king=d6; queen=none; rook=h8; bishop=f5; knight=none; pawn=d5,g5,h6,c7,f7\nCounts: white king=1; queen=1; rook=1; bishop=0; knight=0; pawn=6 | black king=1; queen=0; rook=1; bishop=1; knight=0; pawn=5\nValues: white total=20; black total=13\nBalance: White is up 7 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01804", "split": "perception", "task_type": "multi_state_tracking", "fen": "r3k1nr/1p1bb1pp/1qn1p3/p2pPpN1/3N4/2PB4/PP3PPP/R1BQR1K1 b kq - 1 13", "prompt": "Starting FEN: r3k1nr/1p1bb1pp/1qn1p3/p2pPpN1/3N4/2PB4/PP3PPP/R1BQR1K1 b kq - 1 13\nAfter the moves e7f6 d1a4, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: kq\nEn passant: none\nHalfmove clock: 1\nFullmove number: 13\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r3k1nr/1p1b2pp/1qn1pb2/p2pPpN1/Q2N4/2PB4/PP3PPP/R1B1R1K1 b kq - 3 14", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "e7f6 d1a4", "_multi_state_tracking_result": "r3k1nr/1p1b2pp/1qn1pb2/p2pPpN1/Q2N4/2PB4/PP3PPP/R1B1R1K1 b kq - 3 14", "diagnostic": true, "hard_gate": false, "moves": "e7f6 d1a4"}} {"example_id": "perception_01805", "split": "perception", "task_type": "board_print", "fen": "1k1r3r/p1p2ppp/8/4b3/4P1q1/Q7/PPP1KP2/RNB2R2 w - - 5 21", "prompt": "Position (FEN): 1k1r3r/p1p2ppp/8/4b3/4P1q1/Q7/PPP1KP2/RNB2R2 w - - 5 21\nShow me the board.", "gold_answer": "8 . k . r . . . r\n7 p . p . . p p p\n6 . . . . . . . .\n5 . . . . b . . .\n4 . . . . P . q .\n3 Q . . . . . . .\n2 P P P . K P . .\n1 R N B . . R . .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01806", "split": "perception", "task_type": "board_to_fen", "fen": "6k1/5pp1/4p2p/4Nn2/8/R3P2P/4r1P1/6K1 w - - 5 31", "prompt": "Here is the current board:\n8 . . . . . . k .\n7 . . . . . p p .\n6 . . . . p . . p\n5 . . . . N n . .\n4 . . . . . . . .\n3 R . . . P . . P\n2 . . . . r . P .\n1 . . . . . . K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 5\nFullmove number: 31\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "6k1/5pp1/4p2p/4Nn2/8/R3P2P/4r1P1/6K1 w - - 5 31", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01807", "split": "perception", "task_type": "piece_id", "fen": "5r2/8/5p2/pR1B2pp/8/P1P5/KP3kPP/8 w - - 2 41", "prompt": "FEN: 5r2/8/5p2/pR1B2pp/8/P1P5/KP3kPP/8 w - - 2 41\nWhat piece is on b5?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white rook", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "b5"}} {"example_id": "perception_01808", "split": "perception", "task_type": "material_count", "fen": "r2r2k1/1pq1bpp1/2p1p2p/2n1P2P/p1P2P2/4B1N1/PP2Q1P1/1K1RR3 w - -", "prompt": "FEN: r2r2k1/1pq1bpp1/2p1p2p/2n1P2P/p1P2P2/4B1N1/PP2Q1P1/1K1RR3 w - -\nWhat is the material count for both sides?", "gold_answer": "White (13 pieces): 1 bishop, 1 king, 1 knight, 7 pawns, 1 queen, 2 rooks. Black (13 pieces): 1 bishop, 1 king, 1 knight, 7 pawns, 1 queen, 2 rooks. Material is equal.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01809", "split": "perception", "task_type": "square_lookup", "fen": "2r4k/4b1pp/8/3B4/P1p1P3/4BP2/4K1PP/2R5 b - - 1 28", "prompt": "FEN: 2r4k/4b1pp/8/3B4/P1p1P3/4BP2/4K1PP/2R5 b - - 1 28\nWhat is on e4?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "e4=white pawn", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "e4", "diagnostic": true, "hard_gate": false, "square": "e4"}} {"example_id": "perception_01810", "split": "perception", "task_type": "rank_lookup", "fen": "r4rk1/1pp3bp/3qP3/2p2p2/P1P1pn2/2N3P1/4BP1P/1RQ2RK1 b - -", "prompt": "FEN: r4rk1/1pp3bp/3qP3/2p2p2/P1P1pn2/2N3P1/4BP1P/1RQ2RK1 b - -\nWhat is the compressed FEN row for rank 2?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 2: 4BP1P", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "2", "_rank_lookup_row": "4BP1P", "diagnostic": true, "hard_gate": false, "rank": "2", "fen_rank_row": "4BP1P"}} {"example_id": "perception_01811", "split": "perception", "task_type": "square_coordinates", "fen": "r2qk2r/pppbnpp1/3bpn1p/3p4/3P1P2/2PBPN2/PP1N2PP/R1BQ1RK1 w kq - 3 9", "prompt": "FEN: r2qk2r/pppbnpp1/3bpn1p/3p4/3P1P2/2PBPN2/PP1N2PP/R1BQ1RK1 w kq - 3 9\nFor square d5, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "d5: file=d; rank=5; fen_row_from_top=4; file_index=4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "d5", "diagnostic": true, "hard_gate": false, "square": "d5"}} {"example_id": "perception_01812", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r2q2k1/pp4pp/n1r1bp2/2PBp3/8/P3Q3/2P2PPP/3RR1K1 b - - 0 21", "prompt": "FEN: r2q2k1/pp4pp/n1r1bp2/2PBp3/8/P3Q3/2P2PPP/3RR1K1 b - - 0 21\nCompressed rank 8 row: r2q2k1\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 8: a=r; b=1; c=1; d=q; e=1; f=1; g=k; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "8", "_fen_rank_expansion_row": "r2q2k1", "diagnostic": true, "hard_gate": false, "rank": "8", "fen_rank_row": "r2q2k1"}} {"example_id": "perception_01813", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "2kr2nq/pbpn4/1p1p1p1b/3Pp3/2P1P3/2NB1NB1/PPQ3P1/1K1R4 b - - 0 18", "prompt": "Rank 8 row before: 2kr2nq\nFile f changes from 1 to n. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 8: 2kr2nq -> 2kr1nnq", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "d7f8", "_fen_rank_cell_edit_square": "f8", "_fen_rank_cell_edit_rank": "8", "_fen_rank_cell_edit_file": "f", "_fen_rank_cell_edit_before_row": "2kr2nq", "_fen_rank_cell_edit_after_row": "2kr1nnq", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "n", "diagnostic": true, "hard_gate": false, "move": "d7f8", "square": "f8", "rank": "8", "file": "f", "before_row": "2kr2nq", "after_row": "2kr1nnq", "before_fen": "1", "after_fen": "n"}} {"example_id": "perception_01814", "split": "perception", "task_type": "fen_board_edit", "fen": "r3k2r/p1ppq1bp/b1p2pp1/3nP3/2P2P2/1P4P1/P3Q2P/RNB1KB1R w KQkq -", "prompt": "Board FEN before: r3k2r/p1ppq1bp/b1p2pp1/3nP3/2P2P2/1P4P1/P3Q2P/RNB1KB1R\nApply square edits: b3 P->1; b4 1->P\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: r3k2r/p1ppq1bp/b1p2pp1/3nP3/1PP2P2/6P1/P3Q2P/RNB1KB1R", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "b3b4", "_fen_board_edit_board_fen_before": "r3k2r/p1ppq1bp/b1p2pp1/3nP3/2P2P2/1P4P1/P3Q2P/RNB1KB1R", "_fen_board_edit_board_fen_after": "r3k2r/p1ppq1bp/b1p2pp1/3nP3/1PP2P2/6P1/P3Q2P/RNB1KB1R", "_fen_board_edit_edit_text": "b3 P->1; b4 1->P", "_fen_board_edit_changed_squares": [{"square": "b3", "before": "white pawn", "after": "empty", "before_fen": "P", "after_fen": "1"}, {"square": "b4", "before": "empty", "after": "white pawn", "before_fen": "1", "after_fen": "P"}], "diagnostic": true, "hard_gate": false, "move": "b3b4", "board_fen_before": "r3k2r/p1ppq1bp/b1p2pp1/3nP3/2P2P2/1P4P1/P3Q2P/RNB1KB1R", "board_fen_after": "r3k2r/p1ppq1bp/b1p2pp1/3nP3/1PP2P2/6P1/P3Q2P/RNB1KB1R", "edit_text": "b3 P->1; b4 1->P", "changed_squares": [{"square": "b3", "before": "white pawn", "after": "empty", "before_fen": "P", "after_fen": "1"}, {"square": "b4", "before": "empty", "after": "white pawn", "before_fen": "1", "after_fen": "P"}]}} {"example_id": "perception_01815", "split": "perception", "task_type": "move_square_edits", "fen": "6k1/1p4b1/1p5p/4p3/4P1B1/1PNR4/P1K5/5r2 b - -", "prompt": "Starting FEN: 6k1/1p4b1/1p5p/4p3/4P1B1/1PNR4/P1K5/5r2 b - -\nMove: g7f6\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: g7=black bishop; f6=empty.\nSquares: g7 black bishop->empty; f6 empty->black bishop.\nRanks: rank 7 g b->1; rank 6 f 1->b.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "g7f6", "diagnostic": true, "hard_gate": false, "move": "g7f6"}} {"example_id": "perception_01816", "split": "perception", "task_type": "fen_assembly", "fen": "2r4k/2p4p/p4P2/1p4p1/2n2p1B/2P4P/qPQ2PP1/3R2K1 b - - 0 31", "prompt": "Starting FEN: 2r4k/2p4p/p4P2/1p4p1/2n2p1B/2P4P/qPQ2PP1/3R2K1 b - - 0 31\nMove: c8e8\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 31\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black rook c8e8.\nLookup: c8=black rook; e8=empty.\nSquares: c8 black rook->empty; e8 empty->black rook.\nRanks: rank 8 c r->1; rank 8 e 1->r.\nResult FEN: 4r2k/2p4p/p4P2/1p4p1/2n2p1B/2P4P/qPQ2PP1/3R2K1 w - - 1 32", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "c8e8", "diagnostic": true, "hard_gate": false, "move": "c8e8"}} {"example_id": "perception_01817", "split": "perception", "task_type": "fen_row_application", "fen": "r2qkbnr/pp3ppp/2n1p3/3p4/3P1Bb1/4PN2/PP1N1PPP/R2QKB1R b KQkq -", "prompt": "Starting FEN: r2qkbnr/pp3ppp/2n1p3/3p4/3P1Bb1/4PN2/PP1N1PPP/R2QKB1R b KQkq - 0 1\nMove: e8e7\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 8 r2qkbnr->r2q1bnr; rank 7 pp3ppp->pp2kppp.\nResult FEN: r2q1bnr/pp2kppp/2n1p3/3p4/3P1Bb1/4PN2/PP1N1PPP/R2QKB1R w KQ - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "e8e7", "_fen_row_application_rank_rewrites": [{"rank": "8", "before": "r2qkbnr", "after": "r2q1bnr"}, {"rank": "7", "before": "pp3ppp", "after": "pp2kppp"}], "diagnostic": true, "hard_gate": false, "move": "e8e7", "rank_rewrites": [{"rank": "8", "before": "r2qkbnr", "after": "r2q1bnr"}, {"rank": "7", "before": "pp3ppp", "after": "pp2kppp"}]}} {"example_id": "perception_01818", "split": "perception", "task_type": "state_tracking", "fen": "r3k2r/1ppbqp2/1pnp1n2/4p1B1/4P1pp/2PP4/PP2BPPP/R1Q1NRK1 b kq - 1 14", "prompt": "Starting FEN: r3k2r/1ppbqp2/1pnp1n2/4p1B1/4P1pp/2PP4/PP2BPPP/R1Q1NRK1 b kq - 1 14\nAfter the moves c6b8, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: kq\nEn passant: none\nHalfmove clock: 1\nFullmove number: 14\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rn2k2r/1ppbqp2/1p1p1n2/4p1B1/4P1pp/2PP4/PP2BPPP/R1Q1NRK1 w kq - 2 15", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "c6b8", "_state_tracking_result": "rn2k2r/1ppbqp2/1p1p1n2/4p1B1/4P1pp/2PP4/PP2BPPP/R1Q1NRK1 w kq - 2 15"}} {"example_id": "perception_01819", "split": "perception", "task_type": "material_inventory", "fen": "7k/7p/8/8/3N4/8/8/7K w - -", "prompt": "FEN: 7k/7p/8/8/3N4/8/8/7K w - -\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=h1; queen=none; rook=none; bishop=none; knight=d4; pawn=none.\nBlack inventory: king=h8; queen=none; rook=none; bishop=none; knight=none; pawn=h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01820", "split": "perception", "task_type": "material_piece_counts", "fen": "5r2/pNp2kp1/1np2p2/4p1p1/2Pr4/1P1P3P/P3K2P/3R2R1 b - - 5 21", "prompt": "FEN: 5r2/pNp2kp1/1np2p2/4p1p1/2Pr4/1P1P3P/P3K2P/3R2R1 b - - 5 21\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=2; bishop=0; knight=1; pawn=6.\nBlack counts: king=1; queen=0; rook=2; bishop=0; knight=1; pawn=7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01821", "split": "perception", "task_type": "material_value_totals", "fen": "rn2kb1r/ppp1n2p/5p2/4p1p1/3pP3/BP1P1N1q/P1P2P1P/R2Q1RK1 b kq -", "prompt": "FEN: rn2kb1r/ppp1n2p/5p2/4p1p1/3pP3/BP1P1N1q/P1P2P1P/R2Q1RK1 b kq -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=3; knight=3; pawn=7; total=32.\nBlack values: king=0; queen=9; rook=10; bishop=3; knight=6; pawn=8; total=36.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01822", "split": "perception", "task_type": "material_balance_trace", "fen": "r7/p7/kpn5/3Q4/1p3P1P/8/P3N3/4K3 b - - 2 34", "prompt": "FEN: r7/p7/kpn5/3Q4/1p3P1P/8/P3N3/4K3 b - - 2 34\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=e1; queen=d5; rook=none; bishop=none; knight=e2; pawn=a2,f4,h4 | black king=a6; queen=none; rook=a8; bishop=none; knight=c6; pawn=b4,b6,a7\nCounts: white king=1; queen=1; rook=0; bishop=0; knight=1; pawn=3 | black king=1; queen=0; rook=1; bishop=0; knight=1; pawn=3\nValues: white total=15; black total=11\nBalance: White is up 4 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01823", "split": "perception", "task_type": "multi_state_tracking", "fen": "r1bq1rk1/ppp2ppp/2n5/1BbPp3/4n3/P1p2N2/1P2NPPP/R1BQ1RK1 w - -", "prompt": "Starting FEN: r1bq1rk1/ppp2ppp/2n5/1BbPp3/4n3/P1p2N2/1P2NPPP/R1BQ1RK1 w - - 0 1\nAfter the moves c1d2 d8f6, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r1b2rk1/ppp2ppp/2n2q2/1BbPp3/4n3/P1p2N2/1P1BNPPP/R2Q1RK1 w - - 2 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "c1d2 d8f6", "_multi_state_tracking_result": "r1b2rk1/ppp2ppp/2n2q2/1BbPp3/4n3/P1p2N2/1P1BNPPP/R2Q1RK1 w - - 2 2", "diagnostic": true, "hard_gate": false, "moves": "c1d2 d8f6"}} {"example_id": "perception_01824", "split": "perception", "task_type": "board_print", "fen": "r2qkbnr/ppp2ppp/2n1b3/3pP3/3P4/8/PP3PPP/RNBQKBNR w KQkq -", "prompt": "Position (FEN): r2qkbnr/ppp2ppp/2n1b3/3pP3/3P4/8/PP3PPP/RNBQKBNR w KQkq -\nShow me the board.", "gold_answer": "8 r . . q k b n r\n7 p p p . . p p p\n6 . . n . b . . .\n5 . . . p P . . .\n4 . . . P . . . .\n3 . . . . . . . .\n2 P P . . . P P P\n1 R N B Q K B N R\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01825", "split": "perception", "task_type": "board_to_fen", "fen": "r4r1k/pbq1bppB/1pp1p3/4P3/2P3n1/2N1P3/PBQ2PPP/R4RK1 w - -", "prompt": "Here is the current board:\n8 r . . . . r . k\n7 p b q . b p p B\n6 . p p . p . . .\n5 . . . . P . . .\n4 . . P . . . n .\n3 . . N . P . . .\n2 P B Q . . P P P\n1 R . . . . R K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r4r1k/pbq1bppB/1pp1p3/4P3/2P3n1/2N1P3/PBQ2PPP/R4RK1 w - - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01826", "split": "perception", "task_type": "piece_id", "fen": "R7/6k1/P4r2/2K5/8/8/8/8 b - -", "prompt": "FEN: R7/6k1/P4r2/2K5/8/8/8/8 b - -\nWhat piece is on f6?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black rook", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "f6"}} {"example_id": "perception_01827", "split": "perception", "task_type": "material_count", "fen": "rnbk1bnr/ppppq1pp/8/4pP1Q/5P2/6P1/PPPP3P/RNB1KBNR w KQ -", "prompt": "FEN: rnbk1bnr/ppppq1pp/8/4pP1Q/5P2/6P1/PPPP3P/RNB1KBNR w KQ -\nWhat is the material count for both sides?", "gold_answer": "White (16 pieces): 2 bishops, 1 king, 2 knights, 8 pawns, 1 queen, 2 rooks. Black (15 pieces): 2 bishops, 1 king, 2 knights, 7 pawns, 1 queen, 2 rooks. White is up 1 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01828", "split": "perception", "task_type": "square_lookup", "fen": "r1b3k1/ppp3pp/8/8/1n1p1Q2/2N4P/PPP1P3/2R2KN1 w - - 2 19", "prompt": "FEN: r1b3k1/ppp3pp/8/8/1n1p1Q2/2N4P/PPP1P3/2R2KN1 w - - 2 19\nWhat is on h1?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "h1=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "h1", "diagnostic": true, "hard_gate": false, "square": "h1"}} {"example_id": "perception_01829", "split": "perception", "task_type": "rank_lookup", "fen": "2r2rk1/1bq1bppp/p1n1pn2/6B1/N2P4/PB1Q1N2/5PPP/3RR1K1 w - -", "prompt": "FEN: 2r2rk1/1bq1bppp/p1n1pn2/6B1/N2P4/PB1Q1N2/5PPP/3RR1K1 w - -\nWhat is the compressed FEN row for rank 5?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 5: 6B1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "5", "_rank_lookup_row": "6B1", "diagnostic": true, "hard_gate": false, "rank": "5", "fen_rank_row": "6B1"}} {"example_id": "perception_01830", "split": "perception", "task_type": "square_coordinates", "fen": "r5k1/1p4pp/3N2q1/p2np3/N3P1nP/6P1/PP2Q3/1K3R2 w - -", "prompt": "FEN: r5k1/1p4pp/3N2q1/p2np3/N3P1nP/6P1/PP2Q3/1K3R2 w - -\nFor square h2, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "h2: file=h; rank=2; fen_row_from_top=7; file_index=8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "h2", "diagnostic": true, "hard_gate": false, "square": "h2"}} {"example_id": "perception_01831", "split": "perception", "task_type": "fen_rank_expansion", "fen": "rr3k2/2pb2bp/3P2p1/2p5/PpB5/1P2RP2/K4P2/3R4 w - -", "prompt": "FEN: rr3k2/2pb2bp/3P2p1/2p5/PpB5/1P2RP2/K4P2/3R4 w - -\nCompressed rank 3 row: 1P2RP2\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 3: a=1; b=P; c=1; d=1; e=R; f=P; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "3", "_fen_rank_expansion_row": "1P2RP2", "diagnostic": true, "hard_gate": false, "rank": "3", "fen_rank_row": "1P2RP2"}} {"example_id": "perception_01832", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "rn2k1nr/p3q1p1/2pp3p/1B2pb2/7P/5N2/PPP2PP1/RN1QK2R w KQkq - 0 11", "prompt": "Rank 1 row before: RN1QK2R\nFile d changes from Q to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 1: RN1QK2R -> RN2K2R", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "d1d3", "_fen_rank_cell_edit_square": "d1", "_fen_rank_cell_edit_rank": "1", "_fen_rank_cell_edit_file": "d", "_fen_rank_cell_edit_before_row": "RN1QK2R", "_fen_rank_cell_edit_after_row": "RN2K2R", "_fen_rank_cell_edit_before_fen": "Q", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "d1d3", "square": "d1", "rank": "1", "file": "d", "before_row": "RN1QK2R", "after_row": "RN2K2R", "before_fen": "Q", "after_fen": "1"}} {"example_id": "perception_01833", "split": "perception", "task_type": "fen_board_edit", "fen": "rnb1k2r/pppp1ppp/8/4p3/4P2q/P2P1Q2/1PP2PP1/RN2KB1R b KQkq - 0 9", "prompt": "Board FEN before: rnb1k2r/pppp1ppp/8/4p3/4P2q/P2P1Q2/1PP2PP1/RN2KB1R\nApply square edits: h4 q->1; d8 1->q\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: rnbqk2r/pppp1ppp/8/4p3/4P3/P2P1Q2/1PP2PP1/RN2KB1R", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "h4d8", "_fen_board_edit_board_fen_before": "rnb1k2r/pppp1ppp/8/4p3/4P2q/P2P1Q2/1PP2PP1/RN2KB1R", "_fen_board_edit_board_fen_after": "rnbqk2r/pppp1ppp/8/4p3/4P3/P2P1Q2/1PP2PP1/RN2KB1R", "_fen_board_edit_edit_text": "h4 q->1; d8 1->q", "_fen_board_edit_changed_squares": [{"square": "h4", "before": "black queen", "after": "empty", "before_fen": "q", "after_fen": "1"}, {"square": "d8", "before": "empty", "after": "black queen", "before_fen": "1", "after_fen": "q"}], "diagnostic": true, "hard_gate": false, "move": "h4d8", "board_fen_before": "rnb1k2r/pppp1ppp/8/4p3/4P2q/P2P1Q2/1PP2PP1/RN2KB1R", "board_fen_after": "rnbqk2r/pppp1ppp/8/4p3/4P3/P2P1Q2/1PP2PP1/RN2KB1R", "edit_text": "h4 q->1; d8 1->q", "changed_squares": [{"square": "h4", "before": "black queen", "after": "empty", "before_fen": "q", "after_fen": "1"}, {"square": "d8", "before": "empty", "after": "black queen", "before_fen": "1", "after_fen": "q"}]}} {"example_id": "perception_01834", "split": "perception", "task_type": "move_square_edits", "fen": "rnbq1rk1/ppp1bppp/4pn2/3p2B1/3P4/2PBP3/PP1N1PPP/R2QK1NR b KQ -", "prompt": "Starting FEN: rnbq1rk1/ppp1bppp/4pn2/3p2B1/3P4/2PBP3/PP1N1PPP/R2QK1NR b KQ -\nMove: b8d7\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: b8=black knight; d7=empty.\nSquares: b8 black knight->empty; d7 empty->black knight.\nRanks: rank 8 b n->1; rank 7 d 1->n.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "b8d7", "diagnostic": true, "hard_gate": false, "move": "b8d7"}} {"example_id": "perception_01835", "split": "perception", "task_type": "fen_assembly", "fen": "r1b1k1nr/pp3pp1/2ppp3/8/2PPP3/2NQ2nP/PP1KNqB1/R1B3R1 w kq - 8 15", "prompt": "Starting FEN: r1b1k1nr/pp3pp1/2ppp3/8/2PPP3/2NQ2nP/PP1KNqB1/R1B3R1 w kq - 8 15\nMove: a2a3\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: kq\nEn passant: none\nHalfmove clock: 8\nFullmove number: 15\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white pawn a2a3.\nLookup: a2=white pawn; a3=empty.\nSquares: a2 white pawn->empty; a3 empty->white pawn.\nRanks: rank 2 a P->1; rank 3 a 1->P.\nResult FEN: r1b1k1nr/pp3pp1/2ppp3/8/2PPP3/P1NQ2nP/1P1KNqB1/R1B3R1 b kq - 0 15", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "a2a3", "diagnostic": true, "hard_gate": false, "move": "a2a3"}} {"example_id": "perception_01836", "split": "perception", "task_type": "fen_row_application", "fen": "6k1/3n1pp1/p5qp/8/4N3/2p2P2/6PP/Q5K1 b - - 1 33", "prompt": "Starting FEN: 6k1/3n1pp1/p5qp/8/4N3/2p2P2/6PP/Q5K1 b - - 1 33\nMove: d7b8\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 33\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 7 3n1pp1->5pp1; rank 8 6k1->1n4k1.\nResult FEN: 1n4k1/5pp1/p5qp/8/4N3/2p2P2/6PP/Q5K1 w - - 2 34", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "d7b8", "_fen_row_application_rank_rewrites": [{"rank": "7", "before": "3n1pp1", "after": "5pp1"}, {"rank": "8", "before": "6k1", "after": "1n4k1"}], "diagnostic": true, "hard_gate": false, "move": "d7b8", "rank_rewrites": [{"rank": "7", "before": "3n1pp1", "after": "5pp1"}, {"rank": "8", "before": "6k1", "after": "1n4k1"}]}} {"example_id": "perception_01837", "split": "perception", "task_type": "state_tracking", "fen": "1kb5/p2r2b1/pp6/8/P6Q/1PN4P/2P2PP1/3RR1K1 w - -", "prompt": "Starting FEN: 1kb5/p2r2b1/pp6/8/P6Q/1PN4P/2P2PP1/3RR1K1 w - - 0 1\nAfter the moves e1f1, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 1kb5/p2r2b1/pp6/8/P6Q/1PN4P/2P2PP1/3R1RK1 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "e1f1", "_state_tracking_result": "1kb5/p2r2b1/pp6/8/P6Q/1PN4P/2P2PP1/3R1RK1 b - - 1 1"}} {"example_id": "perception_01838", "split": "perception", "task_type": "material_inventory", "fen": "2krr3/1q1p2p1/p2R2n1/2p1npNp/2P1p2P/1PN3P1/P3QP2/4R1K1 b - - 3 26", "prompt": "FEN: 2krr3/1q1p2p1/p2R2n1/2p1npNp/2P1p2P/1PN3P1/P3QP2/4R1K1 b - - 3 26\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=e2; rook=e1,d6; bishop=none; knight=c3,g5; pawn=a2,f2,b3,g3,c4,h4.\nBlack inventory: king=c8; queen=b7; rook=d8,e8; bishop=none; knight=e5,g6; pawn=e4,c5,f5,h5,a6,d7,g7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01839", "split": "perception", "task_type": "material_piece_counts", "fen": "r1b2rk1/4nppp/2p5/p7/2NB4/2P5/P4PPP/R3K3 w - -", "prompt": "FEN: r1b2rk1/4nppp/2p5/p7/2NB4/2P5/P4PPP/R3K3 w - -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=1; bishop=1; knight=1; pawn=5.\nBlack counts: king=1; queen=0; rook=2; bishop=1; knight=1; pawn=5.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01840", "split": "perception", "task_type": "material_value_totals", "fen": "r1b2rk1/2q1bppp/2n1p3/ppPpP3/1Pp2P2/P1P1BN2/2Q1B1PP/R4RK1 b - -", "prompt": "FEN: r1b2rk1/2q1bppp/2n1p3/ppPpP3/1Pp2P2/P1P1BN2/2Q1B1PP/R4RK1 b - -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=6; knight=3; pawn=8; total=36.\nBlack values: king=0; queen=9; rook=10; bishop=6; knight=3; pawn=8; total=36.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01841", "split": "perception", "task_type": "material_balance_trace", "fen": "5rk1/5p1p/p1r1pqp1/2NpRn2/2pP1P2/2P4P/PP3QP1/1R4K1 b - - 6 26", "prompt": "FEN: 5rk1/5p1p/p1r1pqp1/2NpRn2/2pP1P2/2P4P/PP3QP1/1R4K1 b - - 6 26\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=f2; rook=b1,e5; bishop=none; knight=c5; pawn=a2,b2,g2,c3,h3,d4,f4 | black king=g8; queen=f6; rook=c6,f8; bishop=none; knight=f5; pawn=c4,d5,a6,e6,g6,f7,h7\nCounts: white king=1; queen=1; rook=2; bishop=0; knight=1; pawn=7 | black king=1; queen=1; rook=2; bishop=0; knight=1; pawn=7\nValues: white total=29; black total=29\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01842", "split": "perception", "task_type": "multi_state_tracking", "fen": "r2qkbnr/pp3ppb/2n1p3/1BppP2N/3P2PP/2N5/PPP2P2/R1BQK2R b KQkq -", "prompt": "Starting FEN: r2qkbnr/pp3ppb/2n1p3/1BppP2N/3P2PP/2N5/PPP2P2/R1BQK2R b KQkq - 0 1\nAfter the moves h7d3 f2f4, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r2qkbnr/pp3pp1/2n1p3/1BppP2N/3P1PPP/2Nb4/PPP5/R1BQK2R b KQkq - 0 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "h7d3 f2f4", "_multi_state_tracking_result": "r2qkbnr/pp3pp1/2n1p3/1BppP2N/3P1PPP/2Nb4/PPP5/R1BQK2R b KQkq - 0 2", "diagnostic": true, "hard_gate": false, "moves": "h7d3 f2f4"}} {"example_id": "perception_01843", "split": "perception", "task_type": "board_print", "fen": "8/6p1/3R3p/5pk1/1r6/5K2/5P1P/8 w - -", "prompt": "Position (FEN): 8/6p1/3R3p/5pk1/1r6/5K2/5P1P/8 w - -\nShow me the board.", "gold_answer": "8 . . . . . . . .\n7 . . . . . . p .\n6 . . . R . . . p\n5 . . . . . p k .\n4 . r . . . . . .\n3 . . . . . K . .\n2 . . . . . P . P\n1 . . . . . . . .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01844", "split": "perception", "task_type": "board_to_fen", "fen": "2N5/4R3/1p2k1p1/4n3/3K4/8/5rPP/8 b - -", "prompt": "Here is the current board:\n8 . . N . . . . .\n7 . . . . R . . .\n6 . p . . k . p .\n5 . . . . n . . .\n4 . . . K . . . .\n3 . . . . . . . .\n2 . . . . . r P P\n1 . . . . . . . .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "2N5/4R3/1p2k1p1/4n3/3K4/8/5rPP/8 b - - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01845", "split": "perception", "task_type": "piece_id", "fen": "rnbqk2r/ppp2ppp/4pn2/3p4/1b1P4/2N2N2/PPPBPPPP/R2QKB1R w KQkq - 4 5", "prompt": "FEN: rnbqk2r/ppp2ppp/4pn2/3p4/1b1P4/2N2N2/PPPBPPPP/R2QKB1R w KQkq - 4 5\nWhat piece is on f7?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "f7"}} {"example_id": "perception_01846", "split": "perception", "task_type": "material_count", "fen": "r4rk1/ppp3pp/4p3/7q/1b3P2/2N5/PP1BNQ1P/n4K1R b - - 0 19", "prompt": "FEN: r4rk1/ppp3pp/4p3/7q/1b3P2/2N5/PP1BNQ1P/n4K1R b - - 0 19\nWhat is the material count for both sides?", "gold_answer": "White (10 pieces): 1 bishop, 1 king, 2 knights, 4 pawns, 1 queen, 1 rook. Black (12 pieces): 1 bishop, 1 king, 1 knight, 6 pawns, 1 queen, 2 rooks. Black is up 4 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01847", "split": "perception", "task_type": "square_lookup", "fen": "r1b2rk1/ppqn1ppp/5n2/2Pp4/5Q2/P1P1PN2/5PPP/R1B1KB1R b KQ -", "prompt": "FEN: r1b2rk1/ppqn1ppp/5n2/2Pp4/5Q2/P1P1PN2/5PPP/R1B1KB1R b KQ -\nWhat is on b7?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "b7=black pawn", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "b7", "diagnostic": true, "hard_gate": false, "square": "b7"}} {"example_id": "perception_01848", "split": "perception", "task_type": "rank_lookup", "fen": "rnbq1rk1/p1p1ppbp/1p1p1np1/8/3P4/2NBPN1P/PPP2PP1/R1BQ1RK1 b - -", "prompt": "FEN: rnbq1rk1/p1p1ppbp/1p1p1np1/8/3P4/2NBPN1P/PPP2PP1/R1BQ1RK1 b - -\nWhat is the compressed FEN row for rank 3?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 3: 2NBPN1P", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "3", "_rank_lookup_row": "2NBPN1P", "diagnostic": true, "hard_gate": false, "rank": "3", "fen_rank_row": "2NBPN1P"}} {"example_id": "perception_01849", "split": "perception", "task_type": "square_coordinates", "fen": "rn1q1rk1/ppp2ppp/3b1n2/8/2BpPN2/3P1Q2/PPP3PP/R1B2RK1 b - - 0 10", "prompt": "FEN: rn1q1rk1/ppp2ppp/3b1n2/8/2BpPN2/3P1Q2/PPP3PP/R1B2RK1 b - - 0 10\nFor square e2, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "e2: file=e; rank=2; fen_row_from_top=7; file_index=5", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "e2", "diagnostic": true, "hard_gate": false, "square": "e2"}} {"example_id": "perception_01850", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r5k1/pp2q1pp/2p5/2bp1P2/6Q1/4r2P/PPP5/RN3R1K w - - 6 26", "prompt": "FEN: r5k1/pp2q1pp/2p5/2bp1P2/6Q1/4r2P/PPP5/RN3R1K w - - 6 26\nCompressed rank 2 row: PPP5\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 2: a=P; b=P; c=P; d=1; e=1; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "2", "_fen_rank_expansion_row": "PPP5", "diagnostic": true, "hard_gate": false, "rank": "2", "fen_rank_row": "PPP5"}} {"example_id": "perception_01851", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "5K2/6P1/p3k3/3pP3/3Pp3/P3P3/8/2q5 b - -", "prompt": "Rank 3 row before: P3P3\nFile a changes from P to q. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 3: P3P3 -> q3P3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "c1a3", "_fen_rank_cell_edit_square": "a3", "_fen_rank_cell_edit_rank": "3", "_fen_rank_cell_edit_file": "a", "_fen_rank_cell_edit_before_row": "P3P3", "_fen_rank_cell_edit_after_row": "q3P3", "_fen_rank_cell_edit_before_fen": "P", "_fen_rank_cell_edit_after_fen": "q", "diagnostic": true, "hard_gate": false, "move": "c1a3", "square": "a3", "rank": "3", "file": "a", "before_row": "P3P3", "after_row": "q3P3", "before_fen": "P", "after_fen": "q"}} {"example_id": "perception_01852", "split": "perception", "task_type": "fen_board_edit", "fen": "8/8/4B3/1k3P2/1P1R2K1/2r5/8/8 w - - 3 45", "prompt": "Board FEN before: 8/8/4B3/1k3P2/1P1R2K1/2r5/8/8\nApply square edits: f5 P->1; f6 1->P\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 8/8/4BP2/1k6/1P1R2K1/2r5/8/8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "f5f6", "_fen_board_edit_board_fen_before": "8/8/4B3/1k3P2/1P1R2K1/2r5/8/8", "_fen_board_edit_board_fen_after": "8/8/4BP2/1k6/1P1R2K1/2r5/8/8", "_fen_board_edit_edit_text": "f5 P->1; f6 1->P", "_fen_board_edit_changed_squares": [{"square": "f5", "before": "white pawn", "after": "empty", "before_fen": "P", "after_fen": "1"}, {"square": "f6", "before": "empty", "after": "white pawn", "before_fen": "1", "after_fen": "P"}], "diagnostic": true, "hard_gate": false, "move": "f5f6", "board_fen_before": "8/8/4B3/1k3P2/1P1R2K1/2r5/8/8", "board_fen_after": "8/8/4BP2/1k6/1P1R2K1/2r5/8/8", "edit_text": "f5 P->1; f6 1->P", "changed_squares": [{"square": "f5", "before": "white pawn", "after": "empty", "before_fen": "P", "after_fen": "1"}, {"square": "f6", "before": "empty", "after": "white pawn", "before_fen": "1", "after_fen": "P"}]}} {"example_id": "perception_01853", "split": "perception", "task_type": "move_square_edits", "fen": "4k3/2r2p2/K3p3/2n5/4P3/1P6/P7/R7 w - -", "prompt": "Starting FEN: 4k3/2r2p2/K3p3/2n5/4P3/1P6/P7/R7 w - -\nMove: a6a5\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: a6=white king; a5=empty.\nSquares: a6 white king->empty; a5 empty->white king.\nRanks: rank 6 a K->1; rank 5 a 1->K.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "a6a5", "diagnostic": true, "hard_gate": false, "move": "a6a5"}} {"example_id": "perception_01854", "split": "perception", "task_type": "fen_assembly", "fen": "rBbqk2r/pp3ppp/5n2/8/2pP4/2N5/PP2B1PP/R2Q1KNR b kq -", "prompt": "Starting FEN: rBbqk2r/pp3ppp/5n2/8/2pP4/2N5/PP2B1PP/R2Q1KNR b kq - 0 1\nMove: h7h5\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: kq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black pawn h7h5.\nLookup: h7=black pawn; h5=empty.\nSquares: h7 black pawn->empty; h5 empty->black pawn.\nRanks: rank 7 h p->1; rank 5 h 1->p.\nResult FEN: rBbqk2r/pp3pp1/5n2/7p/2pP4/2N5/PP2B1PP/R2Q1KNR w kq - 0 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "h7h5", "diagnostic": true, "hard_gate": false, "move": "h7h5"}} {"example_id": "perception_01855", "split": "perception", "task_type": "fen_row_application", "fen": "8/6k1/8/r3NKPP/8/8/8/8 b - - 0 66", "prompt": "Starting FEN: 8/6k1/8/r3NKPP/8/8/8/8 b - - 0 66\nMove: a5d5\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 66\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 5 r3NKPP->3rNKPP.\nResult FEN: 8/6k1/8/3rNKPP/8/8/8/8 w - - 1 67", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "a5d5", "_fen_row_application_rank_rewrites": [{"rank": "5", "before": "r3NKPP", "after": "3rNKPP"}], "diagnostic": true, "hard_gate": false, "move": "a5d5", "rank_rewrites": [{"rank": "5", "before": "r3NKPP", "after": "3rNKPP"}]}} {"example_id": "perception_01856", "split": "perception", "task_type": "state_tracking", "fen": "8/8/8/8/2n5/2k5/K3Q3/8 w - -", "prompt": "Starting FEN: 8/8/8/8/2n5/2k5/K3Q3/8 w - - 0 1\nAfter the moves e2f2, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 8/8/8/8/2n5/2k5/K4Q2/8 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "e2f2", "_state_tracking_result": "8/8/8/8/2n5/2k5/K4Q2/8 b - - 1 1"}} {"example_id": "perception_01857", "split": "perception", "task_type": "material_inventory", "fen": "8/6kp/7q/8/6PK/8/8/q7 w - - 0 50", "prompt": "FEN: 8/6kp/7q/8/6PK/8/8/q7 w - - 0 50\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=h4; queen=none; rook=none; bishop=none; knight=none; pawn=g4.\nBlack inventory: king=g7; queen=a1,h6; rook=none; bishop=none; knight=none; pawn=h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01858", "split": "perception", "task_type": "material_piece_counts", "fen": "rnbk1bnr/pppq1ppp/3P4/3N4/5p2/5N2/PPPPQ1PP/R1B1KB1R w KQ -", "prompt": "FEN: rnbk1bnr/pppq1ppp/3P4/3N4/5p2/5N2/PPPPQ1PP/R1B1KB1R w KQ -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7.\nBlack counts: king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01859", "split": "perception", "task_type": "material_value_totals", "fen": "r4rk1/p1p2p1p/b1p1qnp1/4p3/2P2P2/NP6/P3BQPP/R4RK1 w - -", "prompt": "FEN: r4rk1/p1p2p1p/b1p1qnp1/4p3/2P2P2/NP6/P3BQPP/R4RK1 w - -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=3; knight=3; pawn=6; total=31.\nBlack values: king=0; queen=9; rook=10; bishop=3; knight=3; pawn=7; total=32.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01860", "split": "perception", "task_type": "material_balance_trace", "fen": "1R6/K7/7k/8/6R1/7P/6P1/8 w - - 1 48", "prompt": "FEN: 1R6/K7/7k/8/6R1/7P/6P1/8 w - - 1 48\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=a7; queen=none; rook=g4,b8; bishop=none; knight=none; pawn=g2,h3 | black king=h6; queen=none; rook=none; bishop=none; knight=none; pawn=none\nCounts: white king=1; queen=0; rook=2; bishop=0; knight=0; pawn=2 | black king=1; queen=0; rook=0; bishop=0; knight=0; pawn=0\nValues: white total=12; black total=0\nBalance: White is up 12 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01861", "split": "perception", "task_type": "multi_state_tracking", "fen": "r1b4k/pp4bp/6p1/3QP3/5P1q/8/PP3P1P/R1B2RK1 w - - 1 20", "prompt": "Starting FEN: r1b4k/pp4bp/6p1/3QP3/5P1q/8/PP3P1P/R1B2RK1 w - - 1 20\nAfter the moves d5c5 g7e5, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 20\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r1b4k/pp5p/6p1/2Q1b3/5P1q/8/PP3P1P/R1B2RK1 w - - 0 21", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "d5c5 g7e5", "_multi_state_tracking_result": "r1b4k/pp5p/6p1/2Q1b3/5P1q/8/PP3P1P/R1B2RK1 w - - 0 21", "diagnostic": true, "hard_gate": false, "moves": "d5c5 g7e5"}} {"example_id": "perception_01862", "split": "perception", "task_type": "board_print", "fen": "8/2p1k2p/3b3q/5p2/Q2Ppp2/4P1N1/1P4PP/2B3K1 w - - 0 27", "prompt": "Position (FEN): 8/2p1k2p/3b3q/5p2/Q2Ppp2/4P1N1/1P4PP/2B3K1 w - - 0 27\nShow me the board.", "gold_answer": "8 . . . . . . . .\n7 . . p . k . . p\n6 . . . b . . . q\n5 . . . . . p . .\n4 Q . . P p p . .\n3 . . . . P . N .\n2 . P . . . . P P\n1 . . B . . . K .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01863", "split": "perception", "task_type": "board_to_fen", "fen": "2rqr2k/3n2pp/3P2p1/p5N1/5n1P/1Q3P2/1PP2BP1/R4RK1 b - - 2 27", "prompt": "Here is the current board:\n8 . . r q r . . k\n7 . . . n . . p p\n6 . . . P . . p .\n5 p . . . . . N .\n4 . . . . . n . P\n3 . Q . . . P . .\n2 . P P . . B P .\n1 R . . . . R K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 2\nFullmove number: 27\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "2rqr2k/3n2pp/3P2p1/p5N1/5n1P/1Q3P2/1PP2BP1/R4RK1 b - - 2 27", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01864", "split": "perception", "task_type": "piece_id", "fen": "8/5k2/8/8/4p1P1/4K2P/8/8 w - -", "prompt": "FEN: 8/5k2/8/8/4p1P1/4K2P/8/8 w - -\nWhat piece is on e3?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white king", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "e3"}} {"example_id": "perception_01865", "split": "perception", "task_type": "material_count", "fen": "1R6/8/8/8/5K2/8/R7/3k4 w - -", "prompt": "FEN: 1R6/8/8/8/5K2/8/R7/3k4 w - -\nWhat is the material count for both sides?", "gold_answer": "White (3 pieces): 1 king, 2 rooks. Black (1 pieces): 1 king. White is up 10 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01866", "split": "perception", "task_type": "square_lookup", "fen": "8/8/3kpp2/7p/7P/8/4KPP1/8 b - -", "prompt": "FEN: 8/8/3kpp2/7p/7P/8/4KPP1/8 b - -\nWhat is on d6?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "d6=black king", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "d6", "diagnostic": true, "hard_gate": false, "square": "d6"}} {"example_id": "perception_01867", "split": "perception", "task_type": "rank_lookup", "fen": "rnbqkb1r/2p2ppp/p3pn2/2pp4/PP1P4/4P3/5PPP/RNBQKBNR w KQkq - 0 7", "prompt": "FEN: rnbqkb1r/2p2ppp/p3pn2/2pp4/PP1P4/4P3/5PPP/RNBQKBNR w KQkq - 0 7\nWhat is the compressed FEN row for rank 3?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 3: 4P3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "3", "_rank_lookup_row": "4P3", "diagnostic": true, "hard_gate": false, "rank": "3", "fen_rank_row": "4P3"}} {"example_id": "perception_01868", "split": "perception", "task_type": "square_coordinates", "fen": "1k1r1r2/pp3q2/2p2n2/6Q1/3pNp2/P4P2/1PPB4/1K1R4 w - - 1 22", "prompt": "FEN: 1k1r1r2/pp3q2/2p2n2/6Q1/3pNp2/P4P2/1PPB4/1K1R4 w - - 1 22\nFor square c7, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "c7: file=c; rank=7; fen_row_from_top=2; file_index=3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "c7", "diagnostic": true, "hard_gate": false, "square": "c7"}} {"example_id": "perception_01869", "split": "perception", "task_type": "fen_rank_expansion", "fen": "1R6/kp5r/3p1q2/p1pBp3/4P1p1/1R1PQ2P/PP4P1/6K1 b - - 5 31", "prompt": "FEN: 1R6/kp5r/3p1q2/p1pBp3/4P1p1/1R1PQ2P/PP4P1/6K1 b - - 5 31\nCompressed rank 3 row: 1R1PQ2P\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 3: a=1; b=R; c=1; d=P; e=Q; f=1; g=1; h=P", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "3", "_fen_rank_expansion_row": "1R1PQ2P", "diagnostic": true, "hard_gate": false, "rank": "3", "fen_rank_row": "1R1PQ2P"}} {"example_id": "perception_01870", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "rnbqk1nr/pppp2bp/5pp1/4p3/8/PP4P1/1BPPPPBP/RN1QK1NR b KQkq -", "prompt": "Rank 7 row before: pppp2bp\nFile e changes from 1 to k. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 7: pppp2bp -> ppppk1bp", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "e8e7", "_fen_rank_cell_edit_square": "e7", "_fen_rank_cell_edit_rank": "7", "_fen_rank_cell_edit_file": "e", "_fen_rank_cell_edit_before_row": "pppp2bp", "_fen_rank_cell_edit_after_row": "ppppk1bp", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "k", "diagnostic": true, "hard_gate": false, "move": "e8e7", "square": "e7", "rank": "7", "file": "e", "before_row": "pppp2bp", "after_row": "ppppk1bp", "before_fen": "1", "after_fen": "k"}} {"example_id": "perception_01871", "split": "perception", "task_type": "fen_board_edit", "fen": "r1b1kb1r/ppppqppp/2n2n2/4p1B1/3PP3/2PQ1N2/PP3PPP/RN2KB1R b KQkq -", "prompt": "Board FEN before: r1b1kb1r/ppppqppp/2n2n2/4p1B1/3PP3/2PQ1N2/PP3PPP/RN2KB1R\nApply square edits: c6 n->1; a5 1->n\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: r1b1kb1r/ppppqppp/5n2/n3p1B1/3PP3/2PQ1N2/PP3PPP/RN2KB1R", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "c6a5", "_fen_board_edit_board_fen_before": "r1b1kb1r/ppppqppp/2n2n2/4p1B1/3PP3/2PQ1N2/PP3PPP/RN2KB1R", "_fen_board_edit_board_fen_after": "r1b1kb1r/ppppqppp/5n2/n3p1B1/3PP3/2PQ1N2/PP3PPP/RN2KB1R", "_fen_board_edit_edit_text": "c6 n->1; a5 1->n", "_fen_board_edit_changed_squares": [{"square": "c6", "before": "black knight", "after": "empty", "before_fen": "n", "after_fen": "1"}, {"square": "a5", "before": "empty", "after": "black knight", "before_fen": "1", "after_fen": "n"}], "diagnostic": true, "hard_gate": false, "move": "c6a5", "board_fen_before": "r1b1kb1r/ppppqppp/2n2n2/4p1B1/3PP3/2PQ1N2/PP3PPP/RN2KB1R", "board_fen_after": "r1b1kb1r/ppppqppp/5n2/n3p1B1/3PP3/2PQ1N2/PP3PPP/RN2KB1R", "edit_text": "c6 n->1; a5 1->n", "changed_squares": [{"square": "c6", "before": "black knight", "after": "empty", "before_fen": "n", "after_fen": "1"}, {"square": "a5", "before": "empty", "after": "black knight", "before_fen": "1", "after_fen": "n"}]}} {"example_id": "perception_01872", "split": "perception", "task_type": "move_square_edits", "fen": "r4k2/pp3r2/2n1PPQ1/2p4p/3p4/2P5/P5PP/5RK1 b - -", "prompt": "Starting FEN: r4k2/pp3r2/2n1PPQ1/2p4p/3p4/2P5/P5PP/5RK1 b - -\nMove: a8e8\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: a8=black rook; e8=empty.\nSquares: a8 black rook->empty; e8 empty->black rook.\nRanks: rank 8 a r->1; rank 8 e 1->r.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "a8e8", "diagnostic": true, "hard_gate": false, "move": "a8e8"}} {"example_id": "perception_01873", "split": "perception", "task_type": "fen_assembly", "fen": "8/k1K5/8/1p5p/1P5P/8/8/8 w - -", "prompt": "Starting FEN: 8/k1K5/8/1p5p/1P5P/8/8/8 w - - 0 1\nMove: c7d8\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white king c7d8.\nLookup: c7=white king; d8=empty.\nSquares: c7 white king->empty; d8 empty->white king.\nRanks: rank 7 c K->1; rank 8 d 1->K.\nResult FEN: 3K4/k7/8/1p5p/1P5P/8/8/8 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "c7d8", "diagnostic": true, "hard_gate": false, "move": "c7d8"}} {"example_id": "perception_01874", "split": "perception", "task_type": "fen_row_application", "fen": "rnbqkb1r/pp2pppp/5n2/3p4/3N1B2/2N5/PPP1PPPP/R2QKB1R b KQkq -", "prompt": "Starting FEN: rnbqkb1r/pp2pppp/5n2/3p4/3N1B2/2N5/PPP1PPPP/R2QKB1R b KQkq - 0 1\nMove: f6d7\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 6 5n2->8; rank 7 pp2pppp->pp1npppp.\nResult FEN: rnbqkb1r/pp1npppp/8/3p4/3N1B2/2N5/PPP1PPPP/R2QKB1R w KQkq - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "f6d7", "_fen_row_application_rank_rewrites": [{"rank": "6", "before": "5n2", "after": "8"}, {"rank": "7", "before": "pp2pppp", "after": "pp1npppp"}], "diagnostic": true, "hard_gate": false, "move": "f6d7", "rank_rewrites": [{"rank": "6", "before": "5n2", "after": "8"}, {"rank": "7", "before": "pp2pppp", "after": "pp1npppp"}]}} {"example_id": "perception_01875", "split": "perception", "task_type": "state_tracking", "fen": "1rb1k1nr/pp3ppp/2n5/3Nq1N1/8/4B3/P4PPP/3QKB1R w Kk -", "prompt": "Starting FEN: 1rb1k1nr/pp3ppp/2n5/3Nq1N1/8/4B3/P4PPP/3QKB1R w Kk - 0 1\nAfter the moves e1e2, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: Kk\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 1rb1k1nr/pp3ppp/2n5/3Nq1N1/8/4B3/P3KPPP/3Q1B1R b k - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "e1e2", "_state_tracking_result": "1rb1k1nr/pp3ppp/2n5/3Nq1N1/8/4B3/P3KPPP/3Q1B1R b k - 1 1"}} {"example_id": "perception_01876", "split": "perception", "task_type": "material_inventory", "fen": "8/4k1p1/7p/5p2/1R3P2/8/6K1/7r b - - 3 44", "prompt": "FEN: 8/4k1p1/7p/5p2/1R3P2/8/6K1/7r b - - 3 44\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g2; queen=none; rook=b4; bishop=none; knight=none; pawn=f4.\nBlack inventory: king=e7; queen=none; rook=h1; bishop=none; knight=none; pawn=f5,h6,g7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01877", "split": "perception", "task_type": "material_piece_counts", "fen": "2B5/p3bQ2/1k1p4/3Pp1p1/1p1qp3/2n5/5P2/5K2 b - - 7 43", "prompt": "FEN: 2B5/p3bQ2/1k1p4/3Pp1p1/1p1qp3/2n5/5P2/5K2 b - - 7 43\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=0; bishop=1; knight=0; pawn=2.\nBlack counts: king=1; queen=1; rook=0; bishop=1; knight=1; pawn=6.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01878", "split": "perception", "task_type": "material_value_totals", "fen": "r1b3k1/3p2pp/p4q2/5Q2/1p6/1P6/6PP/4R1K1 w - - 1 25", "prompt": "FEN: r1b3k1/3p2pp/p4q2/5Q2/1p6/1P6/6PP/4R1K1 w - - 1 25\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=5; bishop=0; knight=0; pawn=3; total=17.\nBlack values: king=0; queen=9; rook=5; bishop=3; knight=0; pawn=5; total=22.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01879", "split": "perception", "task_type": "material_balance_trace", "fen": "r4rk1/2qnb1pp/1pp2n2/2Pp1N2/pP1Pp3/P6P/2BB1PP1/R2Q1R1K b - - 1 20", "prompt": "FEN: r4rk1/2qnb1pp/1pp2n2/2Pp1N2/pP1Pp3/P6P/2BB1PP1/R2Q1R1K b - - 1 20\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=h1; queen=d1; rook=a1,f1; bishop=c2,d2; knight=f5; pawn=f2,g2,a3,h3,b4,d4,c5 | black king=g8; queen=c7; rook=a8,f8; bishop=e7; knight=f6,d7; pawn=a4,e4,d5,b6,c6,g7,h7\nCounts: white king=1; queen=1; rook=2; bishop=2; knight=1; pawn=7 | black king=1; queen=1; rook=2; bishop=1; knight=2; pawn=7\nValues: white total=35; black total=35\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01880", "split": "perception", "task_type": "multi_state_tracking", "fen": "1n3rk1/rb2q1b1/1p2p2p/p2nP1p1/4Bp2/P2Q1PP1/1P2NB1P/2R2RK1 b - - 0 30", "prompt": "Starting FEN: 1n3rk1/rb2q1b1/1p2p2p/p2nP1p1/4Bp2/P2Q1PP1/1P2NB1P/2R2RK1 b - - 0 30\nAfter the moves b8a6 f2e1, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 30\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 5rk1/rb2q1b1/np2p2p/p2nP1p1/4Bp2/P2Q1PP1/1P2N2P/2R1BRK1 b - - 2 31", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "b8a6 f2e1", "_multi_state_tracking_result": "5rk1/rb2q1b1/np2p2p/p2nP1p1/4Bp2/P2Q1PP1/1P2N2P/2R1BRK1 b - - 2 31", "diagnostic": true, "hard_gate": false, "moves": "b8a6 f2e1"}} {"example_id": "perception_01881", "split": "perception", "task_type": "board_print", "fen": "8/pp3kr1/8/6R1/3p1bb1/1P1B2P1/P2n1K2/7R w - - 0 34", "prompt": "Position (FEN): 8/pp3kr1/8/6R1/3p1bb1/1P1B2P1/P2n1K2/7R w - - 0 34\nShow me the board.", "gold_answer": "8 . . . . . . . .\n7 p p . . . k r .\n6 . . . . . . . .\n5 . . . . . . R .\n4 . . . p . b b .\n3 . P . B . . P .\n2 P . . n . K . .\n1 . . . . . . . R\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01882", "split": "perception", "task_type": "board_to_fen", "fen": "r1b1k2r/1p1nb1pp/2p2p2/4pq2/p2P4/P1Q1BN2/1PP1BPPP/3RR1K1 b kq - 0 16", "prompt": "Here is the current board:\n8 r . b . k . . r\n7 . p . n b . p p\n6 . . p . . p . .\n5 . . . . p q . .\n4 p . . P . . . .\n3 P . Q . B N . .\n2 . P P . B P P P\n1 . . . R R . K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: kq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 16\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r1b1k2r/1p1nb1pp/2p2p2/4pq2/p2P4/P1Q1BN2/1PP1BPPP/3RR1K1 b kq - 0 16", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01883", "split": "perception", "task_type": "piece_id", "fen": "r4r2/3n1p1k/2p1q2p/1pp1pR2/4Pp1P/pP1P1N1Q/P1P2P2/1K1R4 w - -", "prompt": "FEN: r4r2/3n1p1k/2p1q2p/1pp1pR2/4Pp1P/pP1P1N1Q/P1P2P2/1K1R4 w - -\nWhat piece is on h7?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black king", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "h7"}} {"example_id": "perception_01884", "split": "perception", "task_type": "material_count", "fen": "r1bqkbnr/ppp2ppp/2n1p3/8/2BP4/4P3/PP3PPP/RNBQK1NR w KQkq - 0 5", "prompt": "FEN: r1bqkbnr/ppp2ppp/2n1p3/8/2BP4/4P3/PP3PPP/RNBQK1NR w KQkq - 0 5\nWhat is the material count for both sides?", "gold_answer": "White (15 pieces): 2 bishops, 1 king, 2 knights, 7 pawns, 1 queen, 2 rooks. Black (15 pieces): 2 bishops, 1 king, 2 knights, 7 pawns, 1 queen, 2 rooks. Material is equal.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01885", "split": "perception", "task_type": "square_lookup", "fen": "5rk1/pp1qrp1p/8/3pPpQ1/3P4/6R1/PP4PP/5R1K b - -", "prompt": "FEN: 5rk1/pp1qrp1p/8/3pPpQ1/3P4/6R1/PP4PP/5R1K b - -\nWhat is on f7?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "f7=black pawn", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "f7", "diagnostic": true, "hard_gate": false, "square": "f7"}} {"example_id": "perception_01886", "split": "perception", "task_type": "rank_lookup", "fen": "r2q1rk1/4bppp/p2pbn2/1pp1p3/3nP3/P1NPNP2/BPP3PP/R1BQ1RK1 w - -", "prompt": "FEN: r2q1rk1/4bppp/p2pbn2/1pp1p3/3nP3/P1NPNP2/BPP3PP/R1BQ1RK1 w - -\nWhat is the compressed FEN row for rank 5?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 5: 1pp1p3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "5", "_rank_lookup_row": "1pp1p3", "diagnostic": true, "hard_gate": false, "rank": "5", "fen_rank_row": "1pp1p3"}} {"example_id": "perception_01887", "split": "perception", "task_type": "square_coordinates", "fen": "r1bqk2r/p4ppp/2n2n2/2bp4/8/2PB4/P1Q2PPP/RNB1K1NR w KQkq - 0 10", "prompt": "FEN: r1bqk2r/p4ppp/2n2n2/2bp4/8/2PB4/P1Q2PPP/RNB1K1NR w KQkq - 0 10\nFor square f4, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "f4: file=f; rank=4; fen_row_from_top=5; file_index=6", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "f4", "diagnostic": true, "hard_gate": false, "square": "f4"}} {"example_id": "perception_01888", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r3kb1r/1ppbqp2/2np1npp/PB2p3/4P3/1QPP1N2/5PPP/RNB1K2R b KQkq - 0 11", "prompt": "FEN: r3kb1r/1ppbqp2/2np1npp/PB2p3/4P3/1QPP1N2/5PPP/RNB1K2R b KQkq - 0 11\nCompressed rank 4 row: 4P3\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 4: a=1; b=1; c=1; d=1; e=P; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "4", "_fen_rank_expansion_row": "4P3", "diagnostic": true, "hard_gate": false, "rank": "4", "fen_rank_row": "4P3"}} {"example_id": "perception_01889", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "rn1qr1k1/3bppbp/3p2p1/p2P4/1pP5/5NP1/1P1QPP1P/R2NKB1R b KQ - 1 19", "prompt": "Rank 7 row before: 3bppbp\nFile g changes from b to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 7: 3bppbp -> 3bpp1p", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "g7b2", "_fen_rank_cell_edit_square": "g7", "_fen_rank_cell_edit_rank": "7", "_fen_rank_cell_edit_file": "g", "_fen_rank_cell_edit_before_row": "3bppbp", "_fen_rank_cell_edit_after_row": "3bpp1p", "_fen_rank_cell_edit_before_fen": "b", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "g7b2", "square": "g7", "rank": "7", "file": "g", "before_row": "3bppbp", "after_row": "3bpp1p", "before_fen": "b", "after_fen": "1"}} {"example_id": "perception_01890", "split": "perception", "task_type": "fen_board_edit", "fen": "rn1kb2r/pp3ppp/2p1p3/3PN3/2P1p3/4P3/PP3PPP/R2QKB1R b KQ - 0 11", "prompt": "Board FEN before: rn1kb2r/pp3ppp/2p1p3/3PN3/2P1p3/4P3/PP3PPP/R2QKB1R\nApply square edits: a7 p->1; a5 1->p\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: rn1kb2r/1p3ppp/2p1p3/p2PN3/2P1p3/4P3/PP3PPP/R2QKB1R", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "a7a5", "_fen_board_edit_board_fen_before": "rn1kb2r/pp3ppp/2p1p3/3PN3/2P1p3/4P3/PP3PPP/R2QKB1R", "_fen_board_edit_board_fen_after": "rn1kb2r/1p3ppp/2p1p3/p2PN3/2P1p3/4P3/PP3PPP/R2QKB1R", "_fen_board_edit_edit_text": "a7 p->1; a5 1->p", "_fen_board_edit_changed_squares": [{"square": "a7", "before": "black pawn", "after": "empty", "before_fen": "p", "after_fen": "1"}, {"square": "a5", "before": "empty", "after": "black pawn", "before_fen": "1", "after_fen": "p"}], "diagnostic": true, "hard_gate": false, "move": "a7a5", "board_fen_before": "rn1kb2r/pp3ppp/2p1p3/3PN3/2P1p3/4P3/PP3PPP/R2QKB1R", "board_fen_after": "rn1kb2r/1p3ppp/2p1p3/p2PN3/2P1p3/4P3/PP3PPP/R2QKB1R", "edit_text": "a7 p->1; a5 1->p", "changed_squares": [{"square": "a7", "before": "black pawn", "after": "empty", "before_fen": "p", "after_fen": "1"}, {"square": "a5", "before": "empty", "after": "black pawn", "before_fen": "1", "after_fen": "p"}]}} {"example_id": "perception_01891", "split": "perception", "task_type": "move_square_edits", "fen": "2kr3r/pp3pp1/2p1p1b1/4P1Pp/7P/1B5n/PPPN1P2/2KR1R2 b - -", "prompt": "Starting FEN: 2kr3r/pp3pp1/2p1p1b1/4P1Pp/7P/1B5n/PPPN1P2/2KR1R2 b - -\nMove: g6e4\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: g6=black bishop; e4=empty.\nSquares: g6 black bishop->empty; e4 empty->black bishop.\nRanks: rank 6 g b->1; rank 4 e 1->b.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "g6e4", "diagnostic": true, "hard_gate": false, "move": "g6e4"}} {"example_id": "perception_01892", "split": "perception", "task_type": "fen_assembly", "fen": "r1bqk2r/pppp1ppp/2n2n2/b7/2P5/P7/1B1PPPPP/RN1QKBNR b KQkq -", "prompt": "Starting FEN: r1bqk2r/pppp1ppp/2n2n2/b7/2P5/P7/1B1PPPPP/RN1QKBNR b KQkq - 0 1\nMove: a5d2\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black bishop a5d2. Captures white pawn on d2.\nLookup: a5=black bishop; d2=white pawn.\nSquares: a5 black bishop->empty; d2 white pawn->black bishop.\nRanks: rank 5 a b->1; rank 2 d P->b.\nResult FEN: r1bqk2r/pppp1ppp/2n2n2/8/2P5/P7/1B1bPPPP/RN1QKBNR w KQkq - 0 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "a5d2", "diagnostic": true, "hard_gate": false, "move": "a5d2"}} {"example_id": "perception_01893", "split": "perception", "task_type": "fen_row_application", "fen": "8/7k/8/8/8/1K6/8/3q4 w - -", "prompt": "Starting FEN: 8/7k/8/8/8/1K6/8/3q4 w - - 0 1\nMove: b3b2\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 3 1K6->8; rank 2 8->1K6.\nResult FEN: 8/7k/8/8/8/8/1K6/3q4 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "b3b2", "_fen_row_application_rank_rewrites": [{"rank": "3", "before": "1K6", "after": "8"}, {"rank": "2", "before": "8", "after": "1K6"}], "diagnostic": true, "hard_gate": false, "move": "b3b2", "rank_rewrites": [{"rank": "3", "before": "1K6", "after": "8"}, {"rank": "2", "before": "8", "after": "1K6"}]}} {"example_id": "perception_01894", "split": "perception", "task_type": "state_tracking", "fen": "rnbq1rk1/ppp1bppp/4p3/3pP3/3P1P2/2NB4/PPP3PP/R2QK1NR b KQ - 2 8", "prompt": "Starting FEN: rnbq1rk1/ppp1bppp/4p3/3pP3/3P1P2/2NB4/PPP3PP/R2QK1NR b KQ - 2 8\nAfter the moves h7h6, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 2\nFullmove number: 8\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rnbq1rk1/ppp1bpp1/4p2p/3pP3/3P1P2/2NB4/PPP3PP/R2QK1NR w KQ - 0 9", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "h7h6", "_state_tracking_result": "rnbq1rk1/ppp1bpp1/4p2p/3pP3/3P1P2/2NB4/PPP3PP/R2QK1NR w KQ - 0 9"}} {"example_id": "perception_01895", "split": "perception", "task_type": "material_inventory", "fen": "r3r3/8/1p6/pk2p2p/1P5P/8/3B2PK/4R3 w - - 0 37", "prompt": "FEN: r3r3/8/1p6/pk2p2p/1P5P/8/3B2PK/4R3 w - - 0 37\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=h2; queen=none; rook=e1; bishop=d2; knight=none; pawn=g2,b4,h4.\nBlack inventory: king=b5; queen=none; rook=a8,e8; bishop=none; knight=none; pawn=a5,e5,h5,b6.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01896", "split": "perception", "task_type": "material_piece_counts", "fen": "r6k/pp1R2rp/1b6/3Q4/2p5/B6P/P4qPK/8 w - -", "prompt": "FEN: r6k/pp1R2rp/1b6/3Q4/2p5/B6P/P4qPK/8 w - -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=1; bishop=1; knight=0; pawn=3.\nBlack counts: king=1; queen=1; rook=2; bishop=1; knight=0; pawn=4.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01897", "split": "perception", "task_type": "material_value_totals", "fen": "2kr3r/ppp1n1pp/8/4P3/1P2b3/8/PP1B2PP/2K1R2R w - - 0 19", "prompt": "FEN: 2kr3r/ppp1n1pp/8/4P3/1P2b3/8/PP1B2PP/2K1R2R w - - 0 19\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=10; bishop=3; knight=0; pawn=6; total=19.\nBlack values: king=0; queen=0; rook=10; bishop=3; knight=3; pawn=5; total=21.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01898", "split": "perception", "task_type": "material_balance_trace", "fen": "r2qr1k1/ppp2ppp/2npbn2/2b5/2PP4/2N2NPP/PP3PB1/R1BQ1RK1 b - -", "prompt": "FEN: r2qr1k1/ppp2ppp/2npbn2/2b5/2PP4/2N2NPP/PP3PB1/R1BQ1RK1 b - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=d1; rook=a1,f1; bishop=c1,g2; knight=c3,f3; pawn=a2,b2,f2,g3,h3,c4,d4 | black king=g8; queen=d8; rook=a8,e8; bishop=c5,e6; knight=c6,f6; pawn=d6,a7,b7,c7,f7,g7,h7\nCounts: white king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7 | black king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7\nValues: white total=38; black total=38\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01899", "split": "perception", "task_type": "multi_state_tracking", "fen": "rnbqr1k1/pppp1ppp/8/8/4PQ2/2PP3N/P4PPP/bN2KB1R b K - 0 9", "prompt": "Starting FEN: rnbqr1k1/pppp1ppp/8/8/4PQ2/2PP3N/P4PPP/bN2KB1R b K - 0 9\nAfter the moves d7d6 a2a4, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: K\nEn passant: none\nHalfmove clock: 0\nFullmove number: 9\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rnbqr1k1/ppp2ppp/3p4/8/P3PQ2/2PP3N/5PPP/bN2KB1R b K - 0 10", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "d7d6 a2a4", "_multi_state_tracking_result": "rnbqr1k1/ppp2ppp/3p4/8/P3PQ2/2PP3N/5PPP/bN2KB1R b K - 0 10", "diagnostic": true, "hard_gate": false, "moves": "d7d6 a2a4"}} {"example_id": "perception_01900", "split": "perception", "task_type": "board_print", "fen": "5b1r/pk3ppp/bp3n2/8/2p2B2/P1N3PB/P3PP1P/1R1r2K1 w - - 0 22", "prompt": "Position (FEN): 5b1r/pk3ppp/bp3n2/8/2p2B2/P1N3PB/P3PP1P/1R1r2K1 w - - 0 22\nShow me the board.", "gold_answer": "8 . . . . . b . r\n7 p k . . . p p p\n6 b p . . . n . .\n5 . . . . . . . .\n4 . . p . . B . .\n3 P . N . . . P B\n2 P . . . P P . P\n1 . R . r . . K .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01901", "split": "perception", "task_type": "board_to_fen", "fen": "rn1qk2r/ppp1bppp/4pn2/3p1b2/2PP4/2N1PN2/PP1B1PPP/R2QKB1R b KQkq - 3 6", "prompt": "Here is the current board:\n8 r n . q k . . r\n7 p p p . b p p p\n6 . . . . p n . .\n5 . . . p . b . .\n4 . . P P . . . .\n3 . . N . P N . .\n2 P P . B . P P P\n1 R . . Q K B . R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 3\nFullmove number: 6\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "rn1qk2r/ppp1bppp/4pn2/3p1b2/2PP4/2N1PN2/PP1B1PPP/R2QKB1R b KQkq - 3 6", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01902", "split": "perception", "task_type": "piece_id", "fen": "5rk1/1b3ppQ/8/2RN4/8/8/5PPP/6K1 b - -", "prompt": "FEN: 5rk1/1b3ppQ/8/2RN4/8/8/5PPP/6K1 b - -\nWhat piece is on h7?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white queen", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "h7"}} {"example_id": "perception_01903", "split": "perception", "task_type": "material_count", "fen": "2q2rk1/Q1p2pp1/p5np/1pB5/2p5/P6P/2P2PP1/4R1K1 b - - 0 26", "prompt": "FEN: 2q2rk1/Q1p2pp1/p5np/1pB5/2p5/P6P/2P2PP1/4R1K1 b - - 0 26\nWhat is the material count for both sides?", "gold_answer": "White (9 pieces): 1 bishop, 1 king, 5 pawns, 1 queen, 1 rook. Black (11 pieces): 1 king, 1 knight, 7 pawns, 1 queen, 1 rook. Black is up 2 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01904", "split": "perception", "task_type": "square_lookup", "fen": "4brk1/2q2pb1/p4np1/2Q1p1Np/1pP1P2P/3N1PP1/2PR4/1K1R4 b - -", "prompt": "FEN: 4brk1/2q2pb1/p4np1/2Q1p1Np/1pP1P2P/3N1PP1/2PR4/1K1R4 b - -\nWhat is on e8?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "e8=black bishop", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "e8", "diagnostic": true, "hard_gate": false, "square": "e8"}} {"example_id": "perception_01905", "split": "perception", "task_type": "rank_lookup", "fen": "r2qkbnr/pp3ppp/2b1p3/2p1P3/3P1P2/5N2/PP1P2PP/RNBQK2R b KQkq - 0 8", "prompt": "FEN: r2qkbnr/pp3ppp/2b1p3/2p1P3/3P1P2/5N2/PP1P2PP/RNBQK2R b KQkq - 0 8\nWhat is the compressed FEN row for rank 6?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 6: 2b1p3", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "6", "_rank_lookup_row": "2b1p3", "diagnostic": true, "hard_gate": false, "rank": "6", "fen_rank_row": "2b1p3"}} {"example_id": "perception_01906", "split": "perception", "task_type": "square_coordinates", "fen": "2kr2nr/pppqb3/2n1p1pp/3pP3/3P1B2/2PB4/PPQ3PP/RN2K2R w KQ - 0 12", "prompt": "FEN: 2kr2nr/pppqb3/2n1p1pp/3pP3/3P1B2/2PB4/PPQ3PP/RN2K2R w KQ - 0 12\nFor square f1, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "f1: file=f; rank=1; fen_row_from_top=8; file_index=6", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "f1", "diagnostic": true, "hard_gate": false, "square": "f1"}} {"example_id": "perception_01907", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r4k1r/4bppp/p3qn2/1p2p1B1/Q3P3/2N5/PP3PPP/R4RK1 w - - 0 16", "prompt": "FEN: r4k1r/4bppp/p3qn2/1p2p1B1/Q3P3/2N5/PP3PPP/R4RK1 w - - 0 16\nCompressed rank 1 row: R4RK1\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 1: a=R; b=1; c=1; d=1; e=1; f=R; g=K; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "1", "_fen_rank_expansion_row": "R4RK1", "diagnostic": true, "hard_gate": false, "rank": "1", "fen_rank_row": "R4RK1"}} {"example_id": "perception_01908", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "8/8/8/8/2K5/k1B1N3/8/8 w - -", "prompt": "Rank 4 row before: 2K5\nFile c changes from K to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 4: 2K5 -> 8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "c4b5", "_fen_rank_cell_edit_square": "c4", "_fen_rank_cell_edit_rank": "4", "_fen_rank_cell_edit_file": "c", "_fen_rank_cell_edit_before_row": "2K5", "_fen_rank_cell_edit_after_row": "8", "_fen_rank_cell_edit_before_fen": "K", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "c4b5", "square": "c4", "rank": "4", "file": "c", "before_row": "2K5", "after_row": "8", "before_fen": "K", "after_fen": "1"}} {"example_id": "perception_01909", "split": "perception", "task_type": "fen_board_edit", "fen": "r1bq1rk1/1ppp1ppp/pbn2n2/P3p3/1PB1P3/1QPP4/5PPP/RNB1K1NR b KQ - 0 8", "prompt": "Board FEN before: r1bq1rk1/1ppp1ppp/pbn2n2/P3p3/1PB1P3/1QPP4/5PPP/RNB1K1NR\nApply square edits: b6 b->1; d4 1->b\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: r1bq1rk1/1ppp1ppp/p1n2n2/P3p3/1PBbP3/1QPP4/5PPP/RNB1K1NR", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "b6d4", "_fen_board_edit_board_fen_before": "r1bq1rk1/1ppp1ppp/pbn2n2/P3p3/1PB1P3/1QPP4/5PPP/RNB1K1NR", "_fen_board_edit_board_fen_after": "r1bq1rk1/1ppp1ppp/p1n2n2/P3p3/1PBbP3/1QPP4/5PPP/RNB1K1NR", "_fen_board_edit_edit_text": "b6 b->1; d4 1->b", "_fen_board_edit_changed_squares": [{"square": "b6", "before": "black bishop", "after": "empty", "before_fen": "b", "after_fen": "1"}, {"square": "d4", "before": "empty", "after": "black bishop", "before_fen": "1", "after_fen": "b"}], "diagnostic": true, "hard_gate": false, "move": "b6d4", "board_fen_before": "r1bq1rk1/1ppp1ppp/pbn2n2/P3p3/1PB1P3/1QPP4/5PPP/RNB1K1NR", "board_fen_after": "r1bq1rk1/1ppp1ppp/p1n2n2/P3p3/1PBbP3/1QPP4/5PPP/RNB1K1NR", "edit_text": "b6 b->1; d4 1->b", "changed_squares": [{"square": "b6", "before": "black bishop", "after": "empty", "before_fen": "b", "after_fen": "1"}, {"square": "d4", "before": "empty", "after": "black bishop", "before_fen": "1", "after_fen": "b"}]}} {"example_id": "perception_01910", "split": "perception", "task_type": "move_square_edits", "fen": "2r3k1/4bppp/1p2p3/8/1p1Nb3/P3P1P1/1R2BPP1/6K1 w - - 0 22", "prompt": "Starting FEN: 2r3k1/4bppp/1p2p3/8/1p1Nb3/P3P1P1/1R2BPP1/6K1 w - - 0 22\nMove: g1f1\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: g1=white king; f1=empty.\nSquares: g1 white king->empty; f1 empty->white king.\nRanks: rank 1 g K->1; rank 1 f 1->K.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "g1f1", "diagnostic": true, "hard_gate": false, "move": "g1f1"}} {"example_id": "perception_01911", "split": "perception", "task_type": "fen_assembly", "fen": "3r1b1r/pp2pk1p/4b1p1/8/3nPPn1/2N5/PPP2QPP/R1B1K2R w - -", "prompt": "Starting FEN: 3r1b1r/pp2pk1p/4b1p1/8/3nPPn1/2N5/PPP2QPP/R1B1K2R w - - 0 1\nMove: h1f1\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white rook h1f1.\nLookup: h1=white rook; f1=empty.\nSquares: h1 white rook->empty; f1 empty->white rook.\nRanks: rank 1 h R->1; rank 1 f 1->R.\nResult FEN: 3r1b1r/pp2pk1p/4b1p1/8/3nPPn1/2N5/PPP2QPP/R1B1KR2 b - - 1 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "h1f1", "diagnostic": true, "hard_gate": false, "move": "h1f1"}} {"example_id": "perception_01912", "split": "perception", "task_type": "fen_row_application", "fen": "r4r2/p1k5/1qp5/3pn1p1/1P6/P1P1P2R/7Q/RN2K3 b Q - 1 27", "prompt": "Starting FEN: r4r2/p1k5/1qp5/3pn1p1/1P6/P1P1P2R/7Q/RN2K3 b Q - 1 27\nMove: a8e8\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: Q\nEn passant: none\nHalfmove clock: 1\nFullmove number: 27\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 8 r4r2->4rr2.\nResult FEN: 4rr2/p1k5/1qp5/3pn1p1/1P6/P1P1P2R/7Q/RN2K3 w Q - 2 28", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "a8e8", "_fen_row_application_rank_rewrites": [{"rank": "8", "before": "r4r2", "after": "4rr2"}], "diagnostic": true, "hard_gate": false, "move": "a8e8", "rank_rewrites": [{"rank": "8", "before": "r4r2", "after": "4rr2"}]}} {"example_id": "perception_01913", "split": "perception", "task_type": "state_tracking", "fen": "r5k1/pb1q1pp1/1p3b2/2pP2BQ/4R3/P5P1/1P3P1P/2R3K1 b - -", "prompt": "Starting FEN: r5k1/pb1q1pp1/1p3b2/2pP2BQ/4R3/P5P1/1P3P1P/2R3K1 b - - 0 1\nAfter the moves a8f8, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 5rk1/pb1q1pp1/1p3b2/2pP2BQ/4R3/P5P1/1P3P1P/2R3K1 w - - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "a8f8", "_state_tracking_result": "5rk1/pb1q1pp1/1p3b2/2pP2BQ/4R3/P5P1/1P3P1P/2R3K1 w - - 1 2"}} {"example_id": "perception_01914", "split": "perception", "task_type": "material_inventory", "fen": "r1bq1nk1/pp3pbp/2p2np1/3pN1B1/3P4/P1NQ4/1PP2PPP/4RBK1 w - - 3 15", "prompt": "FEN: r1bq1nk1/pp3pbp/2p2np1/3pN1B1/3P4/P1NQ4/1PP2PPP/4RBK1 w - - 3 15\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=g1; queen=d3; rook=e1; bishop=f1,g5; knight=c3,e5; pawn=b2,c2,f2,g2,h2,a3,d4.\nBlack inventory: king=g8; queen=d8; rook=a8; bishop=g7,c8; knight=f6,f8; pawn=d5,c6,g6,a7,b7,f7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01915", "split": "perception", "task_type": "material_piece_counts", "fen": "r1bqk2r/1pp2ppp/pbn5/1B1pP3/3P4/2P2N2/P4PPP/R1BQK2R w KQkq -", "prompt": "FEN: r1bqk2r/1pp2ppp/pbn5/1B1pP3/3P4/2P2N2/P4PPP/R1BQK2R w KQkq -\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=2; knight=1; pawn=7.\nBlack counts: king=1; queen=1; rook=2; bishop=2; knight=1; pawn=7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01916", "split": "perception", "task_type": "material_value_totals", "fen": "2k2bnr/ppp1pppp/8/8/P7/r3KP2/6PP/8 w - - 1 21", "prompt": "FEN: 2k2bnr/ppp1pppp/8/8/P7/r3KP2/6PP/8 w - - 1 21\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=0; bishop=0; knight=0; pawn=4; total=4.\nBlack values: king=0; queen=0; rook=10; bishop=3; knight=3; pawn=7; total=23.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01917", "split": "perception", "task_type": "material_balance_trace", "fen": "r2qkb1r/pp1bnppp/2n1p3/3pP3/3P4/3B1N2/PP3PPP/RNBQK2R w KQkq - 3 8", "prompt": "FEN: r2qkb1r/pp1bnppp/2n1p3/3pP3/3P4/3B1N2/PP3PPP/RNBQK2R w KQkq - 3 8\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=e1; queen=d1; rook=a1,h1; bishop=c1,d3; knight=b1,f3; pawn=a2,b2,f2,g2,h2,d4,e5 | black king=e8; queen=d8; rook=a8,h8; bishop=d7,f8; knight=c6,e7; pawn=d5,e6,a7,b7,f7,g7,h7\nCounts: white king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7 | black king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7\nValues: white total=38; black total=38\nBalance: Material is equal.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01918", "split": "perception", "task_type": "multi_state_tracking", "fen": "r3k1nr/ppp2ppp/2n5/3qp3/1b1P4/2N1PP2/PP1B1P1P/R2QKB1R b KQkq -", "prompt": "Starting FEN: r3k1nr/ppp2ppp/2n5/3qp3/1b1P4/2N1PP2/PP1B1P1P/R2QKB1R b KQkq - 0 1\nAfter the moves b7b6 d1e2 b6b5, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: KQkq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r3k1nr/p1p2ppp/2n5/1p1qp3/1b1P4/2N1PP2/PP1BQP1P/R3KB1R w KQkq - 0 3", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "b7b6 d1e2 b6b5", "_multi_state_tracking_result": "r3k1nr/p1p2ppp/2n5/1p1qp3/1b1P4/2N1PP2/PP1BQP1P/R3KB1R w KQkq - 0 3", "diagnostic": true, "hard_gate": false, "moves": "b7b6 d1e2 b6b5"}} {"example_id": "perception_01919", "split": "perception", "task_type": "board_print", "fen": "1rb2r1k/3n1p1p/p6P/q1pp2P1/1b3P2/2N5/PPPQ4/1K1R1B1R w - - 1 20", "prompt": "Position (FEN): 1rb2r1k/3n1p1p/p6P/q1pp2P1/1b3P2/2N5/PPPQ4/1K1R1B1R w - - 1 20\nShow me the board.", "gold_answer": "8 . r b . . r . k\n7 . . . n . p . p\n6 p . . . . . . P\n5 q . p p . . P .\n4 . b . . . P . .\n3 . . N . . . . .\n2 P P P Q . . . .\n1 . K . R . B . R\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01920", "split": "perception", "task_type": "board_to_fen", "fen": "8/6pp/p1rk1p2/4p3/8/P1R5/1P3PPP/5K2 w - -", "prompt": "Here is the current board:\n8 . . . . . . . .\n7 . . . . . . p p\n6 p . r k . p . .\n5 . . . . p . . .\n4 . . . . . . . .\n3 P . R . . . . .\n2 . P . . . P P P\n1 . . . . . K . .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "8/6pp/p1rk1p2/4p3/8/P1R5/1P3PPP/5K2 w - - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01921", "split": "perception", "task_type": "piece_id", "fen": "rn1qk3/pp2b2p/2pp2r1/5p2/3P2p1/2PB4/PP1BQPPP/R3RNK1 w q - 0 16", "prompt": "FEN: rn1qk3/pp2b2p/2pp2r1/5p2/3P2p1/2PB4/PP1BQPPP/R3RNK1 w q - 0 16\nWhat piece is on g2?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "g2"}} {"example_id": "perception_01922", "split": "perception", "task_type": "material_count", "fen": "4rrk1/3bnp1p/p4Qp1/8/1p2BP1N/8/P5PP/5RK1 w - -", "prompt": "FEN: 4rrk1/3bnp1p/p4Qp1/8/1p2BP1N/8/P5PP/5RK1 w - -\nWhat is the material count for both sides?", "gold_answer": "White (9 pieces): 1 bishop, 1 king, 1 knight, 4 pawns, 1 queen, 1 rook. Black (10 pieces): 1 bishop, 1 king, 1 knight, 5 pawns, 2 rooks. White is up 3 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01923", "split": "perception", "task_type": "square_lookup", "fen": "rn1qkb1r/ppp2ppp/4pn2/8/2PP4/2NQ4/PP3PPP/R1B1K1NR w KQkq -", "prompt": "FEN: rn1qkb1r/ppp2ppp/4pn2/8/2PP4/2NQ4/PP3PPP/R1B1K1NR w KQkq -\nWhat is on e8?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "e8=black king", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "e8", "diagnostic": true, "hard_gate": false, "square": "e8"}} {"example_id": "perception_01924", "split": "perception", "task_type": "rank_lookup", "fen": "6k1/6pp/8/p2r4/6P1/2b1P2P/2N2P2/1R4K1 w - - 5 33", "prompt": "FEN: 6k1/6pp/8/p2r4/6P1/2b1P2P/2N2P2/1R4K1 w - - 5 33\nWhat is the compressed FEN row for rank 7?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 7: 6pp", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_rank_lookup_rank": "7", "_rank_lookup_row": "6pp", "diagnostic": true, "hard_gate": false, "rank": "7", "fen_rank_row": "6pp"}} {"example_id": "perception_01925", "split": "perception", "task_type": "square_coordinates", "fen": "2kr2nr/ppp1pp1p/6p1/4b3/8/2P2B2/PP3PPP/RN2K2R b - - 0 12", "prompt": "FEN: 2kr2nr/ppp1pp1p/6p1/4b3/8/2P2B2/PP3PPP/RN2K2R b - - 0 12\nFor square e1, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "e1: file=e; rank=1; fen_row_from_top=8; file_index=5", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "e1", "diagnostic": true, "hard_gate": false, "square": "e1"}} {"example_id": "perception_01926", "split": "perception", "task_type": "fen_rank_expansion", "fen": "Q5Q1/8/8/8/8/8/1PP3P1/R2K2k1 b - - 2 54", "prompt": "FEN: Q5Q1/8/8/8/8/8/1PP3P1/R2K2k1 b - - 2 54\nCompressed rank 1 row: R2K2k1\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 1: a=R; b=1; c=1; d=K; e=1; f=1; g=k; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "1", "_fen_rank_expansion_row": "R2K2k1", "diagnostic": true, "hard_gate": false, "rank": "1", "fen_rank_row": "R2K2k1"}} {"example_id": "perception_01927", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "3R2k1/p4rpp/2B2p2/5P2/1p2PN2/2p5/PP2Q1PP/7K b - -", "prompt": "Rank 8 row before: 3R2k1\nFile f changes from 1 to r. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 8: 3R2k1 -> 3R1rk1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "f7f8", "_fen_rank_cell_edit_square": "f8", "_fen_rank_cell_edit_rank": "8", "_fen_rank_cell_edit_file": "f", "_fen_rank_cell_edit_before_row": "3R2k1", "_fen_rank_cell_edit_after_row": "3R1rk1", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "r", "diagnostic": true, "hard_gate": false, "move": "f7f8", "square": "f8", "rank": "8", "file": "f", "before_row": "3R2k1", "after_row": "3R1rk1", "before_fen": "1", "after_fen": "r"}} {"example_id": "perception_01928", "split": "perception", "task_type": "fen_board_edit", "fen": "rn1qk1nr/pp4pp/3Pbp2/8/8/2N2N2/PPP2PPP/R1BQKB1R b KQkq - 0 8", "prompt": "Board FEN before: rn1qk1nr/pp4pp/3Pbp2/8/8/2N2N2/PPP2PPP/R1BQKB1R\nApply square edits: g7 p->1; g6 1->p\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: rn1qk1nr/pp5p/3Pbpp1/8/8/2N2N2/PPP2PPP/R1BQKB1R", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "g7g6", "_fen_board_edit_board_fen_before": "rn1qk1nr/pp4pp/3Pbp2/8/8/2N2N2/PPP2PPP/R1BQKB1R", "_fen_board_edit_board_fen_after": "rn1qk1nr/pp5p/3Pbpp1/8/8/2N2N2/PPP2PPP/R1BQKB1R", "_fen_board_edit_edit_text": "g7 p->1; g6 1->p", "_fen_board_edit_changed_squares": [{"square": "g7", "before": "black pawn", "after": "empty", "before_fen": "p", "after_fen": "1"}, {"square": "g6", "before": "empty", "after": "black pawn", "before_fen": "1", "after_fen": "p"}], "diagnostic": true, "hard_gate": false, "move": "g7g6", "board_fen_before": "rn1qk1nr/pp4pp/3Pbp2/8/8/2N2N2/PPP2PPP/R1BQKB1R", "board_fen_after": "rn1qk1nr/pp5p/3Pbpp1/8/8/2N2N2/PPP2PPP/R1BQKB1R", "edit_text": "g7 p->1; g6 1->p", "changed_squares": [{"square": "g7", "before": "black pawn", "after": "empty", "before_fen": "p", "after_fen": "1"}, {"square": "g6", "before": "empty", "after": "black pawn", "before_fen": "1", "after_fen": "p"}]}} {"example_id": "perception_01929", "split": "perception", "task_type": "move_square_edits", "fen": "rnbq1rk1/pp2ppbp/3p1np1/2p5/3P1B2/2P1PN2/PP2BPPP/RN1QK2R w KQ -", "prompt": "Starting FEN: rnbq1rk1/pp2ppbp/3p1np1/2p5/3P1B2/2P1PN2/PP2BPPP/RN1QK2R w KQ -\nMove: e3e4\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: e3=white pawn; e4=empty.\nSquares: e3 white pawn->empty; e4 empty->white pawn.\nRanks: rank 3 e P->1; rank 4 e 1->P.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "e3e4", "diagnostic": true, "hard_gate": false, "move": "e3e4"}} {"example_id": "perception_01930", "split": "perception", "task_type": "fen_assembly", "fen": "r4rk1/5ppp/p1p5/1pb1p3/5q2/2P2P2/PP1NQP1P/1K1R3R b - - 1 19", "prompt": "Starting FEN: r4rk1/5ppp/p1p5/1pb1p3/5q2/2P2P2/PP1NQP1P/1K1R3R b - - 1 19\nMove: f4a4\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 1\nFullmove number: 19\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black queen f4a4.\nLookup: f4=black queen; a4=empty.\nSquares: f4 black queen->empty; a4 empty->black queen.\nRanks: rank 4 f q->1; rank 4 a 1->q.\nResult FEN: r4rk1/5ppp/p1p5/1pb1p3/q7/2P2P2/PP1NQP1P/1K1R3R w - - 2 20", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "f4a4", "diagnostic": true, "hard_gate": false, "move": "f4a4"}} {"example_id": "perception_01931", "split": "perception", "task_type": "fen_row_application", "fen": "rnbq1rk1/ppp1ppbp/5np1/3p4/8/3P1NP1/PPPNPPBP/R1BQ1RK1 b - -", "prompt": "Starting FEN: rnbq1rk1/ppp1ppbp/5np1/3p4/8/3P1NP1/PPPNPPBP/R1BQ1RK1 b - - 0 1\nMove: g7h8\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 7 ppp1ppbp->ppp1pp1p; rank 8 rnbq1rk1->rnbq1rkb.\nResult FEN: rnbq1rkb/ppp1pp1p/5np1/3p4/8/3P1NP1/PPPNPPBP/R1BQ1RK1 w - - 1 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_row_application_move": "g7h8", "_fen_row_application_rank_rewrites": [{"rank": "7", "before": "ppp1ppbp", "after": "ppp1pp1p"}, {"rank": "8", "before": "rnbq1rk1", "after": "rnbq1rkb"}], "diagnostic": true, "hard_gate": false, "move": "g7h8", "rank_rewrites": [{"rank": "7", "before": "ppp1ppbp", "after": "ppp1pp1p"}, {"rank": "8", "before": "rnbq1rk1", "after": "rnbq1rkb"}]}} {"example_id": "perception_01932", "split": "perception", "task_type": "state_tracking", "fen": "r4rk1/1b3pp1/2p3p1/p3p3/1P2N3/3P4/1P3PPP/R4RK1 b - - 0 22", "prompt": "Starting FEN: r4rk1/1b3pp1/2p3p1/p3p3/1P2N3/3P4/1P3PPP/R4RK1 b - - 0 22\nAfter the moves f7f5, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 22\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r4rk1/1b4p1/2p3p1/p3pp2/1P2N3/3P4/1P3PPP/R4RK1 w - - 0 23", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "f7f5", "_state_tracking_result": "r4rk1/1b4p1/2p3p1/p3pp2/1P2N3/3P4/1P3PPP/R4RK1 w - - 0 23"}} {"example_id": "perception_01933", "split": "perception", "task_type": "material_inventory", "fen": "rnb1k2r/1Q3p1p/p2p2p1/1p2p3/4P1P1/P3B3/1PP1BP1P/R3K2R b KQkq -", "prompt": "FEN: rnb1k2r/1Q3p1p/p2p2p1/1p2p3/4P1P1/P3B3/1PP1BP1P/R3K2R b KQkq -\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=e1; queen=b7; rook=a1,h1; bishop=e2,e3; knight=none; pawn=b2,c2,f2,h2,a3,e4,g4.\nBlack inventory: king=e8; queen=none; rook=a8,h8; bishop=c8; knight=b8; pawn=b5,e5,a6,d6,g6,f7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01934", "split": "perception", "task_type": "material_piece_counts", "fen": "8/2k1n1Q1/1rpn2q1/5p2/2B2P1p/4P2P/P4R2/6K1 w - - 8 38", "prompt": "FEN: 8/2k1n1Q1/1rpn2q1/5p2/2B2P1p/4P2P/P4R2/6K1 w - - 8 38\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=1; bishop=1; knight=0; pawn=4.\nBlack counts: king=1; queen=1; rook=1; bishop=0; knight=2; pawn=3.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01935", "split": "perception", "task_type": "material_value_totals", "fen": "rn1k4/p4K2/5p2/1Nb1p1p1/1P6/3p4/Pr6/8 w - - 0 40", "prompt": "FEN: rn1k4/p4K2/5p2/1Nb1p1p1/1P6/3p4/Pr6/8 w - - 0 40\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=0; bishop=0; knight=3; pawn=2; total=5.\nBlack values: king=0; queen=0; rook=10; bishop=3; knight=3; pawn=5; total=21.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01936", "split": "perception", "task_type": "material_balance_trace", "fen": "2rqr1k1/pb1n2bp/1p1N2p1/4p3/2P5/1P1B4/PB3PPP/R2QR1K1 b - - 0 17", "prompt": "FEN: 2rqr1k1/pb1n2bp/1p1N2p1/4p3/2P5/1P1B4/PB3PPP/R2QR1K1 b - - 0 17\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=d1; rook=a1,e1; bishop=b2,d3; knight=d6; pawn=a2,f2,g2,h2,b3,c4 | black king=g8; queen=d8; rook=c8,e8; bishop=b7,g7; knight=d7; pawn=e5,b6,g6,a7,h7\nCounts: white king=1; queen=1; rook=2; bishop=2; knight=1; pawn=6 | black king=1; queen=1; rook=2; bishop=2; knight=1; pawn=5\nValues: white total=34; black total=33\nBalance: White is up 1 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01937", "split": "perception", "task_type": "multi_state_tracking", "fen": "rq2r1k1/p2nbppp/3pb3/2p5/1P2PB2/P1N3Q1/2P1B1PP/3R1R1K w - -", "prompt": "Starting FEN: rq2r1k1/p2nbppp/3pb3/2p5/1P2PB2/P1N3Q1/2P1B1PP/3R1R1K w - - 0 1\nAfter the moves c3a4 d7e5, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: rq2r1k1/p3bppp/3pb3/2p1n3/NP2PB2/P5Q1/2P1B1PP/3R1R1K w - - 2 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "c3a4 d7e5", "_multi_state_tracking_result": "rq2r1k1/p3bppp/3pb3/2p1n3/NP2PB2/P5Q1/2P1B1PP/3R1R1K w - - 2 2", "diagnostic": true, "hard_gate": false, "moves": "c3a4 d7e5"}} {"example_id": "perception_01938", "split": "perception", "task_type": "board_print", "fen": "4k3/8/5K2/8/8/8/6Q1/4r3 b - -", "prompt": "Position (FEN): 4k3/8/5K2/8/8/8/6Q1/4r3 b - -\nShow me the board.", "gold_answer": "8 . . . . k . . .\n7 . . . . . . . .\n6 . . . . . K . .\n5 . . . . . . . .\n4 . . . . . . . .\n3 . . . . . . . .\n2 . . . . . . Q .\n1 . . . . r . . .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01939", "split": "perception", "task_type": "board_to_fen", "fen": "r1b1kb1r/pp1p1ppp/1qn1pn2/8/3PP3/2N2N2/PP3PPP/1RBQKB1R b Kkq - 5 7", "prompt": "Here is the current board:\n8 r . b . k b . r\n7 p p . p . p p p\n6 . q n . p n . .\n5 . . . . . . . .\n4 . . . P P . . .\n3 . . N . . N . .\n2 P P . . . P P P\n1 . R B Q K B . R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: Kkq\nEn passant: none\nHalfmove clock: 5\nFullmove number: 7\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r1b1kb1r/pp1p1ppp/1qn1pn2/8/3PP3/2N2N2/PP3PPP/1RBQKB1R b Kkq - 5 7", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01940", "split": "perception", "task_type": "piece_id", "fen": "2b2r2/r5k1/p2q1p2/1ppPp1p1/4P2p/2P3PP/PP2QR1B/5RK1 b - - 0 29", "prompt": "FEN: 2b2r2/r5k1/p2q1p2/1ppPp1p1/4P2p/2P3PP/PP2QR1B/5RK1 b - - 0 29\nWhat piece is on f8?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black rook", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "f8"}} {"example_id": "perception_01941", "split": "perception", "task_type": "material_count", "fen": "2rq1rk1/1b3pb1/p2p1Np1/1pn1p1Np/3BP2P/5P2/PPPQ2P1/1K1R1B1R b - -", "prompt": "FEN: 2rq1rk1/1b3pb1/p2p1Np1/1pn1p1Np/3BP2P/5P2/PPPQ2P1/1K1R1B1R b - -\nWhat is the material count for both sides?", "gold_answer": "White (15 pieces): 2 bishops, 1 king, 2 knights, 7 pawns, 1 queen, 2 rooks. Black (14 pieces): 2 bishops, 1 king, 1 knight, 7 pawns, 1 queen, 2 rooks. White is up 3 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01942", "split": "perception", "task_type": "square_lookup", "fen": "r3kb1r/1pp1pppp/p2q1n2/3N3b/8/4BNPP/PPP1QPB1/R3K2R b KQkq -", "prompt": "FEN: r3kb1r/1pp1pppp/p2q1n2/3N3b/8/4BNPP/PPP1QPB1/R3K2R b KQkq -\nWhat is on e5?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "e5=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_lookup_square": "e5", "diagnostic": true, "hard_gate": false, "square": "e5"}} {"example_id": "perception_01943", "split": "perception", "task_type": "rank_lookup", "fen": "8/8/8/5N2/4K2k/8/4Q3/8 b - -", "prompt": "FEN: 8/8/8/5N2/4K2k/8/4Q3/8 b - -\nWhat is the compressed FEN row for rank 7?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 7: 8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "7", "_rank_lookup_row": "8", "diagnostic": true, "hard_gate": false, "rank": "7", "fen_rank_row": "8"}} {"example_id": "perception_01944", "split": "perception", "task_type": "square_coordinates", "fen": "5r1k/7p/2R5/8/5P2/2p1P2P/5KP1/3q4 b - -", "prompt": "FEN: 5r1k/7p/2R5/8/5P2/2p1P2P/5KP1/3q4 b - -\nFor square h3, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "h3: file=h; rank=3; fen_row_from_top=6; file_index=8", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_square_coordinates_square": "h3", "diagnostic": true, "hard_gate": false, "square": "h3"}} {"example_id": "perception_01945", "split": "perception", "task_type": "fen_rank_expansion", "fen": "2rqk2r/3nbpp1/p2pbn2/1p2p3/4PP1p/1NNBB2P/PPPQ2P1/1K1R3R b k -", "prompt": "FEN: 2rqk2r/3nbpp1/p2pbn2/1p2p3/4PP1p/1NNBB2P/PPPQ2P1/1K1R3R b k -\nCompressed rank 2 row: PPPQ2P1\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 2: a=P; b=P; c=P; d=Q; e=1; f=1; g=P; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "2", "_fen_rank_expansion_row": "PPPQ2P1", "diagnostic": true, "hard_gate": false, "rank": "2", "fen_rank_row": "PPPQ2P1"}} {"example_id": "perception_01946", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "2r1b1k1/2p2rpp/3nN3/p1RP1p2/4P3/N4P2/5KPP/3R4 w - - 2 33", "prompt": "Rank 2 row before: 5KPP\nFile f changes from K to 1. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 2: 5KPP -> 6PP", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "f2e3", "_fen_rank_cell_edit_square": "f2", "_fen_rank_cell_edit_rank": "2", "_fen_rank_cell_edit_file": "f", "_fen_rank_cell_edit_before_row": "5KPP", "_fen_rank_cell_edit_after_row": "6PP", "_fen_rank_cell_edit_before_fen": "K", "_fen_rank_cell_edit_after_fen": "1", "diagnostic": true, "hard_gate": false, "move": "f2e3", "square": "f2", "rank": "2", "file": "f", "before_row": "5KPP", "after_row": "6PP", "before_fen": "K", "after_fen": "1"}} {"example_id": "perception_01947", "split": "perception", "task_type": "fen_board_edit", "fen": "8/3k3n/8/5P2/8/3P2P1/P2N1P2/2KR4 w - - 1 57", "prompt": "Board FEN before: 8/3k3n/8/5P2/8/3P2P1/P2N1P2/2KR4\nApply square edits: g3 P->1; g4 1->P\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 8/3k3n/8/5P2/6P1/3P4/P2N1P2/2KR4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "g3g4", "_fen_board_edit_board_fen_before": "8/3k3n/8/5P2/8/3P2P1/P2N1P2/2KR4", "_fen_board_edit_board_fen_after": "8/3k3n/8/5P2/6P1/3P4/P2N1P2/2KR4", "_fen_board_edit_edit_text": "g3 P->1; g4 1->P", "_fen_board_edit_changed_squares": [{"square": "g3", "before": "white pawn", "after": "empty", "before_fen": "P", "after_fen": "1"}, {"square": "g4", "before": "empty", "after": "white pawn", "before_fen": "1", "after_fen": "P"}], "diagnostic": true, "hard_gate": false, "move": "g3g4", "board_fen_before": "8/3k3n/8/5P2/8/3P2P1/P2N1P2/2KR4", "board_fen_after": "8/3k3n/8/5P2/6P1/3P4/P2N1P2/2KR4", "edit_text": "g3 P->1; g4 1->P", "changed_squares": [{"square": "g3", "before": "white pawn", "after": "empty", "before_fen": "P", "after_fen": "1"}, {"square": "g4", "before": "empty", "after": "white pawn", "before_fen": "1", "after_fen": "P"}]}} {"example_id": "perception_01948", "split": "perception", "task_type": "move_square_edits", "fen": "5k2/p5p1/1p1nB1K1/8/7P/P7/1P6/8 b - -", "prompt": "Starting FEN: 5k2/p5p1/1p1nB1K1/8/7P/P7/1P6/8 b - -\nMove: f8e7\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: f8=black king; e7=empty.\nSquares: f8 black king->empty; e7 empty->black king.\nRanks: rank 8 f k->1; rank 7 e 1->k.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "f8e7", "diagnostic": true, "hard_gate": false, "move": "f8e7"}} {"example_id": "perception_01949", "split": "perception", "task_type": "fen_assembly", "fen": "r7/3k2p1/4pn1p/3p4/3n2PP/1bbP1P2/1q5K/8 w - - 2 38", "prompt": "Starting FEN: r7/3k2p1/4pn1p/3p4/3n2PP/1bbP1P2/1q5K/8 w - - 2 38\nMove: h2h1\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 2\nFullmove number: 38\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: white king h2h1.\nLookup: h2=white king; h1=empty.\nSquares: h2 white king->empty; h1 empty->white king.\nRanks: rank 2 h K->1; rank 1 h 1->K.\nResult FEN: r7/3k2p1/4pn1p/3p4/3n2PP/1bbP1P2/1q6/7K b - - 3 38", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "h2h1", "diagnostic": true, "hard_gate": false, "move": "h2h1"}} {"example_id": "perception_01950", "split": "perception", "task_type": "fen_row_application", "fen": "2kr3r/pp5p/2p2p1P/2P1p3/3p1n2/P4Q2/2q2P2/3R1K1R b - - 0 32", "prompt": "Starting FEN: 2kr3r/pp5p/2p2p1P/2P1p3/3p1n2/P4Q2/2q2P2/3R1K1R b - - 0 32\nMove: c2b3\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 32\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 2 2q2P2->5P2; rank 3 P4Q2->Pq3Q2.\nResult FEN: 2kr3r/pp5p/2p2p1P/2P1p3/3p1n2/Pq3Q2/5P2/3R1K1R w - - 1 33", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "c2b3", "_fen_row_application_rank_rewrites": [{"rank": "2", "before": "2q2P2", "after": "5P2"}, {"rank": "3", "before": "P4Q2", "after": "Pq3Q2"}], "diagnostic": true, "hard_gate": false, "move": "c2b3", "rank_rewrites": [{"rank": "2", "before": "2q2P2", "after": "5P2"}, {"rank": "3", "before": "P4Q2", "after": "Pq3Q2"}]}} {"example_id": "perception_01951", "split": "perception", "task_type": "state_tracking", "fen": "2kr1bnr/pbpn4/1p1pq3/4p1pp/2P5/2N2NB1/PPQ1BPPP/R3K2R b KQ - 5 13", "prompt": "Starting FEN: 2kr1bnr/pbpn4/1p1pq3/4p1pp/2P5/2N2NB1/PPQ1BPPP/R3K2R b KQ - 5 13\nAfter the moves c8b8, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: KQ\nEn passant: none\nHalfmove clock: 5\nFullmove number: 13\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 1k1r1bnr/pbpn4/1p1pq3/4p1pp/2P5/2N2NB1/PPQ1BPPP/R3K2R w KQ - 6 14", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "c8b8", "_state_tracking_result": "1k1r1bnr/pbpn4/1p1pq3/4p1pp/2P5/2N2NB1/PPQ1BPPP/R3K2R w KQ - 6 14"}} {"example_id": "perception_01952", "split": "perception", "task_type": "material_inventory", "fen": "r2qkbnr/4pppp/p1n5/1p1p4/B2P2b1/4BN2/PPP2PPP/RN1QK2R w KQkq - 0 8", "prompt": "FEN: r2qkbnr/4pppp/p1n5/1p1p4/B2P2b1/4BN2/PPP2PPP/RN1QK2R w KQkq - 0 8\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=e1; queen=d1; rook=a1,h1; bishop=e3,a4; knight=b1,f3; pawn=a2,b2,c2,f2,g2,h2,d4.\nBlack inventory: king=e8; queen=d8; rook=a8,h8; bishop=g4,f8; knight=c6,g8; pawn=b5,d5,a6,e7,f7,g7,h7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01953", "split": "perception", "task_type": "material_piece_counts", "fen": "rnb1kb1r/pp2ppp1/2p2n1p/8/3P4/2N2N1P/PPP1BPP1/R1B1K2R b KQkq - 0 8", "prompt": "FEN: rnb1kb1r/pp2ppp1/2p2n1p/8/3P4/2N2N1P/PPP1BPP1/R1B1K2R b KQkq - 0 8\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=2; bishop=2; knight=2; pawn=7.\nBlack counts: king=1; queen=0; rook=2; bishop=2; knight=2; pawn=7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01954", "split": "perception", "task_type": "material_value_totals", "fen": "8/pp6/2p3p1/4p1k1/6P1/2P2K2/P1P4P/8 w - -", "prompt": "FEN: 8/pp6/2p3p1/4p1k1/6P1/2P2K2/P1P4P/8 w - -\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=0; rook=0; bishop=0; knight=0; pawn=5; total=5.\nBlack values: king=0; queen=0; rook=0; bishop=0; knight=0; pawn=5; total=5.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01955", "split": "perception", "task_type": "material_balance_trace", "fen": "rnbqk2r/pp3ppp/3Bpn2/3p4/3P4/5N2/PPPN1PPP/R2QKB1R b KQkq -", "prompt": "FEN: rnbqk2r/pp3ppp/3Bpn2/3p4/3P4/5N2/PPPN1PPP/R2QKB1R b KQkq -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=e1; queen=d1; rook=a1,h1; bishop=f1,d6; knight=d2,f3; pawn=a2,b2,c2,f2,g2,h2,d4 | black king=e8; queen=d8; rook=a8,h8; bishop=c8; knight=f6,b8; pawn=d5,e6,a7,b7,f7,g7,h7\nCounts: white king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7 | black king=1; queen=1; rook=2; bishop=1; knight=2; pawn=7\nValues: white total=38; black total=35\nBalance: White is up 3 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01956", "split": "perception", "task_type": "multi_state_tracking", "fen": "r2qrnk1/p3bppp/5n2/2pp4/8/P1BBPP1P/1P2NP2/2RQ1RK1 w - -", "prompt": "Starting FEN: r2qrnk1/p3bppp/5n2/2pp4/8/P1BBPP1P/1P2NP2/2RQ1RK1 w - - 0 1\nAfter the moves d3f5 d8b6, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r3rnk1/p3bppp/1q3n2/2pp1B2/8/P1B1PP1P/1P2NP2/2RQ1RK1 w - - 2 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "d3f5 d8b6", "_multi_state_tracking_result": "r3rnk1/p3bppp/1q3n2/2pp1B2/8/P1B1PP1P/1P2NP2/2RQ1RK1 w - - 2 2", "diagnostic": true, "hard_gate": false, "moves": "d3f5 d8b6"}} {"example_id": "perception_01957", "split": "perception", "task_type": "board_print", "fen": "r1b2rk1/ppq2ppp/3B4/5n2/2B5/5Q2/PPP2PPP/RN3RK1 b - - 0 12", "prompt": "Position (FEN): r1b2rk1/ppq2ppp/3B4/5n2/2B5/5Q2/PPP2PPP/RN3RK1 b - - 0 12\nShow me the board.", "gold_answer": "8 r . b . . r k .\n7 p p q . . p p p\n6 . . . B . . . .\n5 . . . . . n . .\n4 . . B . . . . .\n3 . . . . . Q . .\n2 P P P . . P P P\n1 R N . . . R K .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01958", "split": "perception", "task_type": "board_to_fen", "fen": "r4r1k/ppp3p1/1bnp2qp/3N1bB1/1PB3nP/P3PN2/2PQ1PP1/2KR3R w - - 0 17", "prompt": "Here is the current board:\n8 r . . . . r . k\n7 p p p . . . p .\n6 . b n p . . q p\n5 . . . N . b B .\n4 . P B . . . n P\n3 P . . . P N . .\n2 . . P Q . P P .\n1 . . K R . . . R\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 17\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r4r1k/ppp3p1/1bnp2qp/3N1bB1/1PB3nP/P3PN2/2PQ1PP1/2KR3R w - - 0 17", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01959", "split": "perception", "task_type": "piece_id", "fen": "4R3/6kp/5bp1/2BB1n2/p1P5/P2r2P1/5PKP/8 b - -", "prompt": "FEN: 4R3/6kp/5bp1/2BB1n2/p1P5/P2r2P1/5PKP/8 b - -\nWhat piece is on g6?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "black pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_piece_id_square": "g6"}} {"example_id": "perception_01960", "split": "perception", "task_type": "material_count", "fen": "8/8/8/p7/1p6/k7/2K5/7b w - - 0 68", "prompt": "FEN: 8/8/8/p7/1p6/k7/2K5/7b w - - 0 68\nWhat is the material count for both sides?", "gold_answer": "White (1 pieces): 1 king. Black (4 pieces): 1 bishop, 1 king, 2 pawns. Black is up 5 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01961", "split": "perception", "task_type": "square_lookup", "fen": "r2k4/1Rn5/3p1p2/p3pBp1/P1PPP2p/4BP2/7K/8 w - - 3 30", "prompt": "FEN: r2k4/1Rn5/3p1p2/p3pBp1/P1PPP2p/4BP2/7K/8 w - - 3 30\nWhat is on d5?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "d5=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "d5", "diagnostic": true, "hard_gate": false, "square": "d5"}} {"example_id": "perception_01962", "split": "perception", "task_type": "rank_lookup", "fen": "8/8/1k6/3K4/1P6/2P5/8/8 w - -", "prompt": "FEN: 8/8/1k6/3K4/1P6/2P5/8/8 w - -\nWhat is the compressed FEN row for rank 4?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 4: 1P6", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "4", "_rank_lookup_row": "1P6", "diagnostic": true, "hard_gate": false, "rank": "4", "fen_rank_row": "1P6"}} {"example_id": "perception_01963", "split": "perception", "task_type": "square_coordinates", "fen": "7b/pk1N1p1p/2p4B/3p4/8/5R2/PPr3PP/6K1 b - - 0 28", "prompt": "FEN: 7b/pk1N1p1p/2p4B/3p4/8/5R2/PPr3PP/6K1 b - - 0 28\nFor square a3, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "a3: file=a; rank=3; fen_row_from_top=6; file_index=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "a3", "diagnostic": true, "hard_gate": false, "square": "a3"}} {"example_id": "perception_01964", "split": "perception", "task_type": "fen_rank_expansion", "fen": "r6r/2pk1p2/1bp1q3/p2pPbp1/Q2P4/BNP1R1Pp/P4P1P/R5K1 w - -", "prompt": "FEN: r6r/2pk1p2/1bp1q3/p2pPbp1/Q2P4/BNP1R1Pp/P4P1P/R5K1 w - -\nCompressed rank 6 row: 1bp1q3\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 6: a=1; b=b; c=p; d=1; e=q; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_expansion_rank": "6", "_fen_rank_expansion_row": "1bp1q3", "diagnostic": true, "hard_gate": false, "rank": "6", "fen_rank_row": "1bp1q3"}} {"example_id": "perception_01965", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "6k1/3NP1p1/8/p5NP/3K4/B2R4/r1r5/8 b - - 0 38", "prompt": "Rank 4 row before: 3K4\nFile a changes from 1 to p. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 4: 3K4 -> p2K4", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_cell_edit_move": "a5a4", "_fen_rank_cell_edit_square": "a4", "_fen_rank_cell_edit_rank": "4", "_fen_rank_cell_edit_file": "a", "_fen_rank_cell_edit_before_row": "3K4", "_fen_rank_cell_edit_after_row": "p2K4", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "p", "diagnostic": true, "hard_gate": false, "move": "a5a4", "square": "a4", "rank": "4", "file": "a", "before_row": "3K4", "after_row": "p2K4", "before_fen": "1", "after_fen": "p"}} {"example_id": "perception_01966", "split": "perception", "task_type": "fen_board_edit", "fen": "rnbq1rk1/1pp2ppp/p3pn2/8/1bBPP3/P1NQ4/1P2NPPP/R1B1K2R b KQ - 0 9", "prompt": "Board FEN before: rnbq1rk1/1pp2ppp/p3pn2/8/1bBPP3/P1NQ4/1P2NPPP/R1B1K2R\nApply square edits: f6 n->1; e8 1->n\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: rnbqnrk1/1pp2ppp/p3p3/8/1bBPP3/P1NQ4/1P2NPPP/R1B1K2R", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_board_edit_move": "f6e8", "_fen_board_edit_board_fen_before": "rnbq1rk1/1pp2ppp/p3pn2/8/1bBPP3/P1NQ4/1P2NPPP/R1B1K2R", "_fen_board_edit_board_fen_after": "rnbqnrk1/1pp2ppp/p3p3/8/1bBPP3/P1NQ4/1P2NPPP/R1B1K2R", "_fen_board_edit_edit_text": "f6 n->1; e8 1->n", "_fen_board_edit_changed_squares": [{"square": "f6", "before": "black knight", "after": "empty", "before_fen": "n", "after_fen": "1"}, {"square": "e8", "before": "empty", "after": "black knight", "before_fen": "1", "after_fen": "n"}], "diagnostic": true, "hard_gate": false, "move": "f6e8", "board_fen_before": "rnbq1rk1/1pp2ppp/p3pn2/8/1bBPP3/P1NQ4/1P2NPPP/R1B1K2R", "board_fen_after": "rnbqnrk1/1pp2ppp/p3p3/8/1bBPP3/P1NQ4/1P2NPPP/R1B1K2R", "edit_text": "f6 n->1; e8 1->n", "changed_squares": [{"square": "f6", "before": "black knight", "after": "empty", "before_fen": "n", "after_fen": "1"}, {"square": "e8", "before": "empty", "after": "black knight", "before_fen": "1", "after_fen": "n"}]}} {"example_id": "perception_01967", "split": "perception", "task_type": "move_square_edits", "fen": "8/k1Q5/3K4/8/8/8/6b1/8 b - -", "prompt": "Starting FEN: 8/k1Q5/3K4/8/8/8/6b1/8 b - -\nMove: a7a8\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: a7=black king; a8=empty.\nSquares: a7 black king->empty; a8 empty->black king.\nRanks: rank 7 a k->1; rank 8 a 1->k.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_move_square_edits_move": "a7a8", "diagnostic": true, "hard_gate": false, "move": "a7a8"}} {"example_id": "perception_01968", "split": "perception", "task_type": "fen_assembly", "fen": "r1b2rk1/pp2qpbp/3pp1p1/2p5/3nPP2/2PPBNP1/PP1Q2BP/R4RK1 b - -", "prompt": "Starting FEN: r1b2rk1/pp2qpbp/3pp1p1/2p5/3nPP2/2PPBNP1/PP1Q2BP/R4RK1 b - - 0 1\nMove: h7h5\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black pawn h7h5.\nLookup: h7=black pawn; h5=empty.\nSquares: h7 black pawn->empty; h5 empty->black pawn.\nRanks: rank 7 h p->1; rank 5 h 1->p.\nResult FEN: r1b2rk1/pp2qpb1/3pp1p1/2p4p/3nPP2/2PPBNP1/PP1Q2BP/R4RK1 w - - 0 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_assembly_move": "h7h5", "diagnostic": true, "hard_gate": false, "move": "h7h5"}} {"example_id": "perception_01969", "split": "perception", "task_type": "fen_row_application", "fen": "r1b1k2r/ppp1q3/1bnp1n1p/4P1p1/2B2p2/2P4P/PP1N2P1/RNBQ1R1K b kq - 0 13", "prompt": "Starting FEN: r1b1k2r/ppp1q3/1bnp1n1p/4P1p1/2B2p2/2P4P/PP1N2P1/RNBQ1R1K b kq - 0 13\nMove: c6b4\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: kq\nEn passant: none\nHalfmove clock: 0\nFullmove number: 13\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 6 1bnp1n1p->1b1p1n1p; rank 4 2B2p2->1nB2p2.\nResult FEN: r1b1k2r/ppp1q3/1b1p1n1p/4P1p1/1nB2p2/2P4P/PP1N2P1/RNBQ1R1K w kq - 1 14", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "c6b4", "_fen_row_application_rank_rewrites": [{"rank": "6", "before": "1bnp1n1p", "after": "1b1p1n1p"}, {"rank": "4", "before": "2B2p2", "after": "1nB2p2"}], "diagnostic": true, "hard_gate": false, "move": "c6b4", "rank_rewrites": [{"rank": "6", "before": "1bnp1n1p", "after": "1b1p1n1p"}, {"rank": "4", "before": "2B2p2", "after": "1nB2p2"}]}} {"example_id": "perception_01970", "split": "perception", "task_type": "state_tracking", "fen": "r2qr1k1/pp1bbppp/2n1pn2/2pp4/3PPB2/2PB1N2/PP1N1PPP/R2QR1K1 b - -", "prompt": "Starting FEN: r2qr1k1/pp1bbppp/2n1pn2/2pp4/3PPB2/2PB1N2/PP1N1PPP/R2QR1K1 b - - 0 1\nAfter the moves b7b5, what is the resulting position?\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r2qr1k1/p2bbppp/2n1pn2/1ppp4/3PPB2/2PB1N2/PP1N1PPP/R2QR1K1 w - - 0 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_state_tracking_moves": "b7b5", "_state_tracking_result": "r2qr1k1/p2bbppp/2n1pn2/1ppp4/3PPB2/2PB1N2/PP1N1PPP/R2QR1K1 w - - 0 2"}} {"example_id": "perception_01971", "split": "perception", "task_type": "material_inventory", "fen": "8/8/p5pk/P6p/8/p2K3P/8/1N6 b - -", "prompt": "FEN: 8/8/p5pk/P6p/8/p2K3P/8/1N6 b - -\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=d3; queen=none; rook=none; bishop=none; knight=b1; pawn=h3,a5.\nBlack inventory: king=h6; queen=none; rook=none; bishop=none; knight=none; pawn=a3,h5,a6,g6.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01972", "split": "perception", "task_type": "material_piece_counts", "fen": "7r/4kq1p/p2p2pQ/2p1p3/2P2P2/3P4/r6P/4R1RK w - - 0 25", "prompt": "FEN: 7r/4kq1p/p2p2pQ/2p1p3/2P2P2/3P4/r6P/4R1RK w - - 0 25\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=1; rook=2; bishop=0; knight=0; pawn=4.\nBlack counts: king=1; queen=1; rook=2; bishop=0; knight=0; pawn=6.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01973", "split": "perception", "task_type": "material_value_totals", "fen": "r1bqkbnr/ppp2ppp/2n5/3p4/2PP4/P7/1P3PPP/RNBQKBNR b KQkq - 0 5", "prompt": "FEN: r1bqkbnr/ppp2ppp/2n5/3p4/2PP4/P7/1P3PPP/RNBQKBNR b KQkq - 0 5\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=7; total=38.\nBlack values: king=0; queen=9; rook=10; bishop=6; knight=6; pawn=7; total=38.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01974", "split": "perception", "task_type": "material_balance_trace", "fen": "8/8/8/8/7N/6K1/6B1/6k1 w - -", "prompt": "FEN: 8/8/8/8/7N/6K1/6B1/6k1 w - -\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g3; queen=none; rook=none; bishop=g2; knight=h4; pawn=none | black king=g1; queen=none; rook=none; bishop=none; knight=none; pawn=none\nCounts: white king=1; queen=0; rook=0; bishop=1; knight=1; pawn=0 | black king=1; queen=0; rook=0; bishop=0; knight=0; pawn=0\nValues: white total=6; black total=0\nBalance: White is up 6 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01975", "split": "perception", "task_type": "multi_state_tracking", "fen": "6k1/1p5p/p3ppp1/3p4/r6P/3K4/2R2PP1/8 w - - 0 35", "prompt": "Starting FEN: 6k1/1p5p/p3ppp1/3p4/r6P/3K4/2R2PP1/8 w - - 0 35\nAfter the moves h4h5 g8h8 d3e2, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 35\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: 7k/1p5p/p3ppp1/3p3P/r7/8/2R1KPP1/8 b - - 2 36", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_multi_state_tracking_moves": "h4h5 g8h8 d3e2", "_multi_state_tracking_result": "7k/1p5p/p3ppp1/3p3P/r7/8/2R1KPP1/8 b - - 2 36", "diagnostic": true, "hard_gate": false, "moves": "h4h5 g8h8 d3e2"}} {"example_id": "perception_01976", "split": "perception", "task_type": "board_print", "fen": "r2q1rk1/1b1nbpp1/pp1p1n1p/2pN4/2B1PB2/5N1P/PPP2PP1/R2QR1K1 w - - 0 13", "prompt": "Position (FEN): r2q1rk1/1b1nbpp1/pp1p1n1p/2pN4/2B1PB2/5N1P/PPP2PP1/R2QR1K1 w - - 0 13\nShow me the board.", "gold_answer": "8 r . . q . r k .\n7 . b . n b p p .\n6 p p . p . n . p\n5 . . p N . . . .\n4 . . B . P B . .\n3 . . . . . N . P\n2 P P P . . P P .\n1 R . . Q R . K .\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01977", "split": "perception", "task_type": "board_to_fen", "fen": "2kr1b1r/ppp5/5p2/3q2pp/1P1p3P/P2P2P1/3BPP2/R2Q1RK1 b - -", "prompt": "Here is the current board:\n8 . . k r . b . r\n7 p p p . . . . .\n6 . . . . . p . .\n5 . . . q . . p p\n4 . P . p . . . P\n3 P . . P . . P .\n2 . . . B P P . .\n1 R . . Q . R K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "2kr1b1r/ppp5/5p2/3q2pp/1P1p3P/P2P2P1/3BPP2/R2Q1RK1 b - - 0 1", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false}} {"example_id": "perception_01978", "split": "perception", "task_type": "piece_id", "fen": "r2qkbnr/p5pp/2pp1p2/np2p3/B3P3/2P2Q1P/PP1P1PP1/RNB2RK1 w kq - 0 10", "prompt": "FEN: r2qkbnr/p5pp/2pp1p2/np2p3/B3P3/2P2Q1P/PP1P1PP1/RNB2RK1 w kq - 0 10\nWhat piece is on h3?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "h3"}} {"example_id": "perception_01979", "split": "perception", "task_type": "material_count", "fen": "N2k1b1r/p3nppp/1pnp4/1B2p3/4q3/1Q5P/PPPP1PP1/R1B1K2R w KQ - 0 12", "prompt": "FEN: N2k1b1r/p3nppp/1pnp4/1B2p3/4q3/1Q5P/PPPP1PP1/R1B1K2R w KQ - 0 12\nWhat is the material count for both sides?", "gold_answer": "White (14 pieces): 2 bishops, 1 king, 1 knight, 7 pawns, 1 queen, 2 rooks. Black (13 pieces): 1 bishop, 1 king, 2 knights, 7 pawns, 1 queen, 1 rook. White is up 5 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01980", "split": "perception", "task_type": "square_lookup", "fen": "b7/4kp1p/4pp2/1p6/2p1P3/5N1P/1P2nPP1/3r1K2 w - - 0 21", "prompt": "FEN: b7/4kp1p/4pp2/1p6/2p1P3/5N1P/1P2nPP1/3r1K2 w - - 0 21\nWhat is on g3?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "g3=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "g3", "diagnostic": true, "hard_gate": false, "square": "g3"}} {"example_id": "perception_01981", "split": "perception", "task_type": "rank_lookup", "fen": "7r/2q2pk1/1p3pb1/p3p2p/7P/6Q1/1P2BPP1/3R2K1 w - -", "prompt": "FEN: 7r/2q2pk1/1p3pb1/p3p2p/7P/6Q1/1P2BPP1/3R2K1 w - -\nWhat is the compressed FEN row for rank 4?\n\nAnswer format: return exactly \"rank N: \".", "gold_answer": "rank 4: 7P", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_rank_lookup_rank": "4", "_rank_lookup_row": "7P", "diagnostic": true, "hard_gate": false, "rank": "4", "fen_rank_row": "7P"}} {"example_id": "perception_01982", "split": "perception", "task_type": "square_coordinates", "fen": "2b1kr2/8/2p5/1p1pp2N/r3n1p1/8/4BPPP/2R2RK1 b - - 3 27", "prompt": "FEN: 2b1kr2/8/2p5/1p1pp2N/r3n1p1/8/4BPPP/2R2RK1 b - - 3 27\nFor square e1, give the FEN row-from-top and file index.\n\nAnswer format: return exactly \": file=; rank=; fen_row_from_top=<1-8>; file_index=<1-8>\".", "gold_answer": "e1: file=e; rank=1; fen_row_from_top=8; file_index=5", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_coordinates_square": "e1", "diagnostic": true, "hard_gate": false, "square": "e1"}} {"example_id": "perception_01983", "split": "perception", "task_type": "fen_rank_expansion", "fen": "2k5/1p4b1/6p1/1p4Pp/1P3P2/P1p1P3/2K5/3R4 w - - 0 37", "prompt": "FEN: 2k5/1p4b1/6p1/1p4Pp/1P3P2/P1p1P3/2K5/3R4 w - - 0 37\nCompressed rank 1 row: 3R4\nExpand it into file cells a through h.\n\nAnswer format: return exactly \"rank N: a=; b=; ...; h=\".", "gold_answer": "rank 1: a=1; b=1; c=1; d=R; e=1; f=1; g=1; h=1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_rank_expansion_rank": "1", "_fen_rank_expansion_row": "3R4", "diagnostic": true, "hard_gate": false, "rank": "1", "fen_rank_row": "3R4"}} {"example_id": "perception_01984", "split": "perception", "task_type": "fen_rank_cell_edit", "fen": "rnbqkbnr/ppp2ppp/8/3p4/8/1P1BP3/PBP2PPP/RN1QK1NR b KQkq -", "prompt": "Rank 5 row before: 3p4\nFile f changes from 1 to b. Rewrite the compressed row.\n\nAnswer format: return exactly \"rank N: -> \".", "gold_answer": "rank 5: 3p4 -> 3p1b2", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_rank_cell_edit_move": "c8f5", "_fen_rank_cell_edit_square": "f5", "_fen_rank_cell_edit_rank": "5", "_fen_rank_cell_edit_file": "f", "_fen_rank_cell_edit_before_row": "3p4", "_fen_rank_cell_edit_after_row": "3p1b2", "_fen_rank_cell_edit_before_fen": "1", "_fen_rank_cell_edit_after_fen": "b", "diagnostic": true, "hard_gate": false, "move": "c8f5", "square": "f5", "rank": "5", "file": "f", "before_row": "3p4", "after_row": "3p1b2", "before_fen": "1", "after_fen": "b"}} {"example_id": "perception_01985", "split": "perception", "task_type": "fen_board_edit", "fen": "1rb1k1nr/pp3ppp/2p1p3/8/1R2P3/3B4/P1PN1PPP/5RK1 b k -", "prompt": "Board FEN before: 1rb1k1nr/pp3ppp/2p1p3/8/1R2P3/3B4/P1PN1PPP/5RK1\nApply square edits: b7 p->1; b5 1->p\nReturn the resulting board FEN only.\n\nAnswer format: return exactly \"Result board FEN: \".", "gold_answer": "Result board FEN: 1rb1k1nr/p4ppp/2p1p3/1p6/1R2P3/3B4/P1PN1PPP/5RK1", "metric_type": "text_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_fen_board_edit_move": "b7b5", "_fen_board_edit_board_fen_before": "1rb1k1nr/pp3ppp/2p1p3/8/1R2P3/3B4/P1PN1PPP/5RK1", "_fen_board_edit_board_fen_after": "1rb1k1nr/p4ppp/2p1p3/1p6/1R2P3/3B4/P1PN1PPP/5RK1", "_fen_board_edit_edit_text": "b7 p->1; b5 1->p", "_fen_board_edit_changed_squares": [{"square": "b7", "before": "black pawn", "after": "empty", "before_fen": "p", "after_fen": "1"}, {"square": "b5", "before": "empty", "after": "black pawn", "before_fen": "1", "after_fen": "p"}], "diagnostic": true, "hard_gate": false, "move": "b7b5", "board_fen_before": "1rb1k1nr/pp3ppp/2p1p3/8/1R2P3/3B4/P1PN1PPP/5RK1", "board_fen_after": "1rb1k1nr/p4ppp/2p1p3/1p6/1R2P3/3B4/P1PN1PPP/5RK1", "edit_text": "b7 p->1; b5 1->p", "changed_squares": [{"square": "b7", "before": "black pawn", "after": "empty", "before_fen": "p", "after_fen": "1"}, {"square": "b5", "before": "empty", "after": "black pawn", "before_fen": "1", "after_fen": "p"}]}} {"example_id": "perception_01986", "split": "perception", "task_type": "move_square_edits", "fen": "rn1qkbnr/pb1p1ppp/1p2p3/2p5/2PP4/4PN2/PP3PPP/RNBQKB1R w KQkq - 1 5", "prompt": "Starting FEN: rn1qkbnr/pb1p1ppp/1p2p3/2p5/2PP4/4PN2/PP3PPP/RNBQKB1R w KQkq - 1 5\nMove: g2g4\nList the square lookups and rank edits.\n\nAnswer format: return exactly three lines starting \"Lookup:\", \"Squares:\", and \"Ranks:\"; do not include Result FEN.", "gold_answer": "Lookup: g2=white pawn; g4=empty.\nSquares: g2 white pawn->empty; g4 empty->white pawn.\nRanks: rank 2 g P->1; rank 4 g 1->P.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_move_square_edits_move": "g2g4", "diagnostic": true, "hard_gate": false, "move": "g2g4"}} {"example_id": "perception_01987", "split": "perception", "task_type": "fen_assembly", "fen": "2r2rk1/5ppp/p2qp3/np1p3b/3Pn3/P1PBBN1P/1PQ2PP1/R4RK1 b - - 7 17", "prompt": "Starting FEN: 2r2rk1/5ppp/p2qp3/np1p3b/3Pn3/P1PBBN1P/1PQ2PP1/R4RK1 b - - 7 17\nMove: g7g6\nUse square lookups and rank edits to assemble the resulting full FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 7\nFullmove number: 17\n\nAnswer format: include the edit trace and exactly one final line \"Result FEN: \".", "gold_answer": "Move 1: black pawn g7g6.\nLookup: g7=black pawn; g6=empty.\nSquares: g7 black pawn->empty; g6 empty->black pawn.\nRanks: rank 7 g p->1; rank 6 g 1->p.\nResult FEN: 2r2rk1/5p1p/p2qp1p1/np1p3b/3Pn3/P1PBBN1P/1PQ2PP1/R4RK1 w - - 0 18", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_assembly_move": "g7g6", "diagnostic": true, "hard_gate": false, "move": "g7g6"}} {"example_id": "perception_01988", "split": "perception", "task_type": "fen_row_application", "fen": "8/8/6r1/1P3R2/6p1/2K5/2P3k1/8 b - - 0 46", "prompt": "Starting FEN: 8/8/6r1/1P3R2/6p1/2K5/2P3k1/8 b - - 0 46\nMove: g4g3\nRewrite the affected compressed FEN rank rows and give Result FEN.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 46\n\nAnswer format: first line starts \"Rows:\" and final line is \"Result FEN: \".", "gold_answer": "Rows: rank 4 6p1->8; rank 3 2K5->2K3p1.\nResult FEN: 8/8/6r1/1P3R2/8/2K3p1/2P3k1/8 w - - 0 47", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_fen_row_application_move": "g4g3", "_fen_row_application_rank_rewrites": [{"rank": "4", "before": "6p1", "after": "8"}, {"rank": "3", "before": "2K5", "after": "2K3p1"}], "diagnostic": true, "hard_gate": false, "move": "g4g3", "rank_rewrites": [{"rank": "4", "before": "6p1", "after": "8"}, {"rank": "3", "before": "2K5", "after": "2K3p1"}]}} {"example_id": "perception_01989", "split": "perception", "task_type": "state_tracking", "fen": "r2qr1k1/pp1n1ppp/2p2n2/2b5/2PQpP2/N2p2P1/PB1P1PBP/R3R1K1 w - - 8 15", "prompt": "Starting FEN: r2qr1k1/pp1n1ppp/2p2n2/2b5/2PQpP2/N2p2P1/PB1P1PBP/R3R1K1 w - - 8 15\nAfter the moves h2h3, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 8\nFullmove number: 15\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r2qr1k1/pp1n1ppp/2p2n2/2b5/2PQpP2/N2p2PP/PB1P1PB1/R3R1K1 b - - 0 15", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_state_tracking_moves": "h2h3", "_state_tracking_result": "r2qr1k1/pp1n1ppp/2p2n2/2b5/2PQpP2/N2p2PP/PB1P1PB1/R3R1K1 b - - 0 15"}} {"example_id": "perception_01990", "split": "perception", "task_type": "material_inventory", "fen": "5k2/5p2/3b1p2/2pKpB1p/1pPp4/1P6/2P1RN1P/r4r2 b - - 7 37", "prompt": "FEN: 5k2/5p2/3b1p2/2pKpB1p/1pPp4/1P6/2P1RN1P/r4r2 b - - 7 37\nList the material inventory by side and piece type.\n\nAnswer format: return exactly two lines starting \"White inventory:\" and \"Black inventory:\".", "gold_answer": "White inventory: king=d5; queen=none; rook=e2; bishop=f5; knight=f2; pawn=c2,h2,b3,c4.\nBlack inventory: king=f8; queen=none; rook=a1,f1; bishop=d6; knight=none; pawn=b4,d4,c5,e5,h5,f6,f7.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01991", "split": "perception", "task_type": "material_piece_counts", "fen": "8/R2k4/8/6p1/3K1pP1/4rP2/8/8 b - - 14 51", "prompt": "FEN: 8/R2k4/8/6p1/3K1pP1/4rP2/8/8 b - - 14 51\nCount each piece type for both sides.\n\nAnswer format: return exactly two lines starting \"White counts:\" and \"Black counts:\".", "gold_answer": "White counts: king=1; queen=0; rook=1; bishop=0; knight=0; pawn=2.\nBlack counts: king=1; queen=0; rook=1; bishop=0; knight=0; pawn=2.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01992", "split": "perception", "task_type": "material_value_totals", "fen": "r2q1rk1/pp1n2pp/n1p1p3/2PpP1b1/3P4/PP3N2/3Q2PP/RN3RK1 w - - 0 16", "prompt": "FEN: r2q1rk1/pp1n2pp/n1p1p3/2PpP1b1/3P4/PP3N2/3Q2PP/RN3RK1 w - - 0 16\nConvert the piece counts into material value totals.\n\nAnswer format: return exactly two lines starting \"White values:\" and \"Black values:\".", "gold_answer": "White values: king=0; queen=9; rook=10; bishop=0; knight=6; pawn=7; total=32.\nBlack values: king=0; queen=9; rook=10; bishop=3; knight=6; pawn=7; total=35.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01993", "split": "perception", "task_type": "material_balance_trace", "fen": "r2q1rk1/pp2bppp/2n2nb1/3pN3/6P1/1BNP3P/PPP2P2/R1BQ1RK1 w - - 1 12", "prompt": "FEN: r2q1rk1/pp2bppp/2n2nb1/3pN3/6P1/1BNP3P/PPP2P2/R1BQ1RK1 w - - 1 12\nTrace inventory, counts, values, and material balance.\n\nAnswer format: return exactly four lines starting \"Inventory:\", \"Counts:\", \"Values:\", and \"Balance:\".", "gold_answer": "Inventory: white king=g1; queen=d1; rook=a1,f1; bishop=c1,b3; knight=c3,e5; pawn=a2,b2,c2,f2,d3,h3,g4 | black king=g8; queen=d8; rook=a8,f8; bishop=g6,e7; knight=c6,f6; pawn=d5,a7,b7,f7,g7,h7\nCounts: white king=1; queen=1; rook=2; bishop=2; knight=2; pawn=7 | black king=1; queen=1; rook=2; bishop=2; knight=2; pawn=6\nValues: white total=38; black total=37\nBalance: White is up 1 point(s) of material.", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "diagnostic": true, "hard_gate": false}} {"example_id": "perception_01994", "split": "perception", "task_type": "multi_state_tracking", "fen": "r4rk1/pp3ppp/2p1q3/5b2/5P2/2RBP3/PP2Q1PP/5RK1 w - -", "prompt": "Starting FEN: r4rk1/pp3ppp/2p1q3/5b2/5P2/2RBP3/PP2Q1PP/5RK1 w - - 0 1\nAfter the moves d3b1 f5h3, what is the resulting position?\nState needed for full FEN:\nSide to move: white\nCastling rights: none\nEn passant: none\nHalfmove clock: 0\nFullmove number: 1\n\nAnswer format: return exactly \"Result FEN: \".", "gold_answer": "Result FEN: r4rk1/pp3ppp/2p1q3/8/5P2/2R1P2b/PP2Q1PP/1B3RK1 w - - 2 2", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_evals", "is_chess960": false, "_multi_state_tracking_moves": "d3b1 f5h3", "_multi_state_tracking_result": "r4rk1/pp3ppp/2p1q3/8/5P2/2R1P2b/PP2Q1PP/1B3RK1 w - - 2 2", "diagnostic": true, "hard_gate": false, "moves": "d3b1 f5h3"}} {"example_id": "perception_01995", "split": "perception", "task_type": "board_print", "fen": "rn1qk2r/pbpppp1p/1p3np1/8/2P5/1PP1P3/P4PPP/R1BQKBNR w KQkq - 1 7", "prompt": "Position (FEN): rn1qk2r/pbpppp1p/1p3np1/8/2P5/1PP1P3/P4PPP/R1BQKBNR w KQkq - 1 7\nShow me the board.", "gold_answer": "8 r n . q k . . r\n7 p b p p p p . p\n6 . p . . . n p .\n5 . . . . . . . .\n4 . . P . . . . .\n3 . P P . P . . .\n2 P . . . . P P P\n1 R . B Q K B N R\n a b c d e f g h", "metric_type": "board_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01996", "split": "perception", "task_type": "board_to_fen", "fen": "r1bq1rk1/p1ppnppp/2p5/2b2N2/4P3/8/PPP2PPP/RNBQ1RK1 b - - 4 8", "prompt": "Here is the current board:\n8 r . b q . r k .\n7 p . p p n p p p\n6 . . p . . . . .\n5 . . b . . N . .\n4 . . . . P . . .\n3 . . . . . . . .\n2 P P P . . P P P\n1 R N B Q . R K .\n a b c d e f g h\nWrite the FEN for this position.\nState needed for full FEN:\nSide to move: black\nCastling rights: none\nEn passant: none\nHalfmove clock: 4\nFullmove number: 8\n\nAnswer format: return exactly one complete six-field FEN, with no prefix and no explanation.", "gold_answer": "r1bq1rk1/p1ppnppp/2p5/2b2N2/4P3/8/PPP2PPP/RNBQ1RK1 b - - 4 8", "metric_type": "fen_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01997", "split": "perception", "task_type": "piece_id", "fen": "4k2r/p2qbpp1/2p1p2p/B1P5/P2Pp3/3rP3/5PPP/RR4K1 b k - 1 18", "prompt": "FEN: 4k2r/p2qbpp1/2p1p2p/B1P5/P2Pp3/3rP3/5PPP/RR4K1 b k - 1 18\nWhat piece is on g2?\n\nAnswer format: for a square query, return only the piece name or empty; do not include the square. For a locate query, return only space-separated squares.", "gold_answer": "white pawn", "metric_type": "exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_piece_id_square": "g2"}} {"example_id": "perception_01998", "split": "perception", "task_type": "material_count", "fen": "8/5pkp/6p1/p2q4/8/6PP/5P2/5K2 b - - 5 38", "prompt": "FEN: 8/5pkp/6p1/p2q4/8/6PP/5P2/5K2 b - - 5 38\nWhat is the material count for both sides?", "gold_answer": "White (4 pieces): 1 king, 3 pawns. Black (6 pieces): 1 king, 4 pawns, 1 queen. Black is up 10 point(s) of material.", "metric_type": "material_count", "metadata": {"source": "lichess_games", "is_chess960": false}} {"example_id": "perception_01999", "split": "perception", "task_type": "square_lookup", "fen": "5rk1/ppq3pp/1npb1B2/3pp3/1P6/P1NP2P1/2PQRP1P/4R1K1 b - - 0 18", "prompt": "FEN: 5rk1/ppq3pp/1npb1B2/3pp3/1P6/P1NP2P1/2PQRP1P/4R1K1 b - - 0 18\nWhat is on f5?\n\nAnswer format: return exactly \"=\" or \"=empty\".", "gold_answer": "f5=empty", "metric_type": "text_exact_match", "metadata": {"source": "lichess_games", "is_chess960": false, "_square_lookup_square": "f5", "diagnostic": true, "hard_gate": false, "square": "f5"}}