fen stringlengths 26 72 | task_type stringclasses 12
values | question stringlengths 123 479 | answer stringlengths 2 171 | source stringclasses 2
values | messages listlengths 2 2 |
|---|---|---|---|---|---|
r1bqr1k1/1pp2ppp/1p1p4/3Ppn2/1P6/2PB1N2/P1Q2PPP/R4RK1 b - - 2 15 | puzzle_legal_moves | List all legal moves for the piece on e8 in this position.
Respond with ONLY the moves in SAN notation, comma-separated.
Example:
FEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
Piece on: b1
Answer: Na3, Nc3
FEN: r1bqr1k1/1pp2ppp/1p1p4/3Ppn2/1P6/2PB1N2/P1Q2PPP/R4RK1 b - - 2 15
Piece on: e8
Answer: | Rf8, Re7, Re6 | lichess | [
{
"role": "user",
"content": "List all legal moves for the piece on e8 in this position.\nRespond with ONLY the moves in SAN notation, comma-separated.\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1\nPiece on: b1\nAnswer: Na3, Nc3\n\nFEN: r1bqr1k1/1pp2ppp/1p1p4/3Ppn2/1P6/2PB1N2/P... |
7Q/8/8/8/8/8/8/8 w - - 0 1 | toy_piece_list_to_legal_moves_uci | List all legal moves for the white piece in UCI notation, comma-separated.
Position (pieces): White: Qh8 | Black:
Answer: | h8a1, h8a8, h8b2, h8b8, h8c3, h8c8, h8d4, h8d8, h8e5, h8e8, h8f6, h8f8, h8g7, h8g8, h8h1, h8h2, h8h3, h8h4, h8h5, h8h6, h8h7 | synthetic | [
{
"role": "user",
"content": "List all legal moves for the white piece in UCI notation, comma-separated.\n\nPosition (pieces): White: Qh8 | Black: \nAnswer:"
},
{
"role": "assistant",
"content": "h8a1, h8a8, h8b2, h8b8, h8c3, h8c8, h8d4, h8d8, h8e5, h8e8, h8f6, h8f8, h8g7, h8g8, h8h1, h8h2, h8h3... |
r3r1k1/p4ppb/7p/1ppQn1q1/3p4/P2P4/BPP1N3/R3K2R b KQ - 1 23 | puzzle_legal_captures | List all legal captures in this position.
Respond with ONLY the captures in SAN notation, comma-separated. If no captures, respond "none".
Example:
FEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4
Answer: Bxf7+
FEN: r3r1k1/p4ppb/7p/1ppQn1q1/3p4/P2P4/BPP1N3/R3K2R b KQ - 1 23
Answer: | Bxd3, Nxd3+ | lichess | [
{
"role": "user",
"content": "List all legal captures in this position.\nRespond with ONLY the captures in SAN notation, comma-separated. If no captures, respond \"none\".\n\nExample:\nFEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4\nAnswer: Bxf7+\n\nFEN: r3r1k1/p4ppb/7p/1ppQn1q1/3p... |
r1b2rk1/pppp1ppp/2n2q1n/2b1P1N1/2Bp4/3Q4/PPP2PPP/RNB2RK1 b - - 0 8 | puzzle_legal_captures | List all legal captures in this position.
Respond with ONLY the captures in SAN notation, comma-separated. If no captures, respond "none".
Example:
FEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4
Answer: Bxf7+
FEN: r1b2rk1/pppp1ppp/2n2q1n/2b1P1N1/2Bp4/3Q4/PPP2PPP/RNB2RK1 b - - 0 8
Answer: | Qxg5, Qxe5, Qxf2+, Nxe5 | lichess | [
{
"role": "user",
"content": "List all legal captures in this position.\nRespond with ONLY the captures in SAN notation, comma-separated. If no captures, respond \"none\".\n\nExample:\nFEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4\nAnswer: Bxf7+\n\nFEN: r1b2rk1/pppp1ppp/2n2q1n/2b1... |
7R/8/5p1k/7p/4P1r1/5KP1/8/8 b - - 16 56 | puzzle_best_move | Find the best move for this chess puzzle. Respond with ONLY the move in UCI notation (e.g., e2e4).
Example 1:
FEN: 8/1r6/8/5k1p/2B4K/1P6/8/1R6 w - - 1 44
Answer: h4h5
Example 2:
FEN: 1r3rk1/pbp2p1p/1p4pb/3qp3/1n6/PP1PP1PP/NBPQ3K/R4RN1 w - - 2 18
Answer: a2b4
Now solve:
FEN: 7R/8/5p1k/7p/4P1r1/5KP1/8/8 b - - 16 56
An... | h6g6 | lichess | [
{
"role": "user",
"content": "Find the best move for this chess puzzle. Respond with ONLY the move in UCI notation (e.g., e2e4).\n\nExample 1:\nFEN: 8/1r6/8/5k1p/2B4K/1P6/8/1R6 w - - 1 44\nAnswer: h4h5\n\nExample 2:\nFEN: 1r3rk1/pbp2p1p/1p4pb/3qp3/1n6/PP1PP1PP/NBPQ3K/R4RN1 w - - 2 18\nAnswer: a2b4\n\nNow so... |
8/8/p1k3p1/P1P2p2/2K3Pp/7P/8/8 w - - 0 51 | puzzle_legal_moves | List all legal moves for the piece on g4 in this position.
Respond with ONLY the moves in SAN notation, comma-separated.
Example:
FEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
Piece on: b1
Answer: Na3, Nc3
FEN: 8/8/p1k3p1/P1P2p2/2K3Pp/7P/8/8 w - - 0 51
Piece on: g4
Answer: | gxf5, g5 | lichess | [
{
"role": "user",
"content": "List all legal moves for the piece on g4 in this position.\nRespond with ONLY the moves in SAN notation, comma-separated.\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1\nPiece on: b1\nAnswer: Na3, Nc3\n\nFEN: 8/8/p1k3p1/P1P2p2/2K3Pp/7P/8/8 w - - 0 51... |
1nkr1b1r/pppb4/4p1p1/PP3p1q/2PP2p1/6P1/5PBP/RNBQ1RK1 w - - 2 19 | puzzle_ascii_board | Generate an ASCII representation of this chess position.
Output ONLY the 8x8 grid. Use uppercase for White, lowercase for Black, dots for empty.
Example:
FEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1
Output:
r n b q k b n r
p p p p p p p p
. . . . . . . .
. . . . . . . .
. . . . P . . .
. . . . . . .... | . n k r . b . r
p p p b . . . .
. . . . p . p .
P P . . . p . q
. . P P . . p .
. . . . . . P .
. . . . . P B P
R N B Q . R K . | lichess | [
{
"role": "user",
"content": "Generate an ASCII representation of this chess position.\nOutput ONLY the 8x8 grid. Use uppercase for White, lowercase for Black, dots for empty.\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1\nOutput:\nr n b q k b n r\np p p p p p p p\n. . . . . .... |
5k2/2p3p1/p1p4p/4N1b1/8/2P1p3/PP2K2P/8 b - - 1 35 | puzzle_piece_positions | List all pieces and their positions from this FEN.
Format: "White: pieces" then "Black: pieces", sorted by piece value (K, Q, R, B, N, P).
Example:
FEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1
Answer:
White: Ke1, Qd1, Ra1, Rh1, Bc1, Bf1, Nb1, Ng1, Pa2, Pb2, Pc2, Pd2, Pe4, Pf2, Pg2, Ph2
Black: Ke8, Q... | White: Ke2, Ne5, Pa2, Pb2, Pc3, Ph2
Black: Kf8, Bg5, Pa6, Pc6, Pc7, Pe3, Pg7, Ph6 | lichess | [
{
"role": "user",
"content": "List all pieces and their positions from this FEN.\nFormat: \"White: pieces\" then \"Black: pieces\", sorted by piece value (K, Q, R, B, N, P).\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1\nAnswer:\nWhite: Ke1, Qd1, Ra1, Rh1, Bc1, Bf1, Nb1, Ng1, ... |
2r5/1Rb1k3/p3p2p/B5p1/2r1p3/6PP/3R1P2/6K1 b - - 0 37 | puzzle_best_move | Find the best move for this chess puzzle. Respond with ONLY the move in UCI notation (e.g., e2e4).
Example 1:
FEN: 8/1r6/8/5k1p/2B4K/1P6/8/1R6 w - - 1 44
Answer: h4h5
Example 2:
FEN: 1r3rk1/pbp2p1p/1p4pb/3qp3/1n6/PP1PP1PP/NBPQ3K/R4RN1 w - - 2 18
Answer: a2b4
Now solve:
FEN: 2r5/1Rb1k3/p3p2p/B5p1/2r1p3/6PP/3R1P2/6K1 ... | c8b8 | lichess | [
{
"role": "user",
"content": "Find the best move for this chess puzzle. Respond with ONLY the move in UCI notation (e.g., e2e4).\n\nExample 1:\nFEN: 8/1r6/8/5k1p/2B4K/1P6/8/1R6 w - - 1 44\nAnswer: h4h5\n\nExample 2:\nFEN: 1r3rk1/pbp2p1p/1p4pb/3qp3/1n6/PP1PP1PP/NBPQ3K/R4RN1 w - - 2 18\nAnswer: a2b4\n\nNow so... |
6k1/5r2/4K1p1/3R2P1/8/8/8/8 b - - 9 69 | puzzle_ascii_board | Generate an ASCII representation of this chess position.
Output ONLY the 8x8 grid. Use uppercase for White, lowercase for Black, dots for empty.
Example:
FEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1
Output:
r n b q k b n r
p p p p p p p p
. . . . . . . .
. . . . . . . .
. . . . P . . .
. . . . . . .... | . . . . . . k .
. . . . . r . .
. . . . K . p .
. . . R . . P .
. . . . . . . .
. . . . . . . .
. . . . . . . .
. . . . . . . . | lichess | [
{
"role": "user",
"content": "Generate an ASCII representation of this chess position.\nOutput ONLY the 8x8 grid. Use uppercase for White, lowercase for Black, dots for empty.\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1\nOutput:\nr n b q k b n r\np p p p p p p p\n. . . . . .... |
r1bqr1k1/p4pPp/2p1p3/2bpn2Q/8/2NB4/PPP3PP/R1B2R1K b - - 2 15 | puzzle_piece_positions | List all pieces and their positions from this FEN.
Format: "White: pieces" then "Black: pieces", sorted by piece value (K, Q, R, B, N, P).
Example:
FEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1
Answer:
White: Ke1, Qd1, Ra1, Rh1, Bc1, Bf1, Nb1, Ng1, Pa2, Pb2, Pc2, Pd2, Pe4, Pf2, Pg2, Ph2
Black: Ke8, Q... | White: Kh1, Qh5, Ra1, Rf1, Bc1, Bd3, Nc3, Pa2, Pb2, Pc2, Pg2, Pg7, Ph2
Black: Kg8, Qd8, Ra8, Re8, Bc5, Bc8, Ne5, Pa7, Pc6, Pd5, Pe6, Pf7, Ph7 | lichess | [
{
"role": "user",
"content": "List all pieces and their positions from this FEN.\nFormat: \"White: pieces\" then \"Black: pieces\", sorted by piece value (K, Q, R, B, N, P).\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1\nAnswer:\nWhite: Ke1, Qd1, Ra1, Rh1, Bc1, Bf1, Nb1, Ng1, ... |
6k1/5ppp/5nb1/pp6/6rP/5N1Q/Pq2r1P1/3R2RK b - - 4 32 | puzzle_legal_captures | List all legal captures in this position.
Respond with ONLY the captures in SAN notation, comma-separated. If no captures, respond "none".
Example:
FEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4
Answer: Bxf7+
FEN: 6k1/5ppp/5nb1/pp6/6rP/5N1Q/Pq2r1P1/3R2RK b - - 4 32
Answer: | Rxh4, Rgxg2, Rexg2, Qxa2 | lichess | [
{
"role": "user",
"content": "List all legal captures in this position.\nRespond with ONLY the captures in SAN notation, comma-separated. If no captures, respond \"none\".\n\nExample:\nFEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4\nAnswer: Bxf7+\n\nFEN: 6k1/5ppp/5nb1/pp6/6rP/5N1Q/... |
8/8/5p2/1p5p/2k1Kp2/P5P1/7P/8 w - - 0 36 | puzzle_ascii_board | Generate an ASCII representation of this chess position.
Output ONLY the 8x8 grid. Use uppercase for White, lowercase for Black, dots for empty.
Example:
FEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1
Output:
r n b q k b n r
p p p p p p p p
. . . . . . . .
. . . . . . . .
. . . . P . . .
. . . . . . .... | . . . . . . . .
. . . . . . . .
. . . . . p . .
. p . . . . . p
. . k . K p . .
P . . . . . P .
. . . . . . . P
. . . . . . . . | lichess | [
{
"role": "user",
"content": "Generate an ASCII representation of this chess position.\nOutput ONLY the 8x8 grid. Use uppercase for White, lowercase for Black, dots for empty.\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1\nOutput:\nr n b q k b n r\np p p p p p p p\n. . . . . .... |
8/8/8/8/8/8/5Q2/8 w - - 0 1 | toy_fen_to_piece_list | List all pieces from this FEN position.
Format: "White: pieces | Black: pieces" using piece symbol + square (e.g., Ne4, pd5).
Uppercase for White, lowercase for Black.
Example:
FEN: 8/8/8/3p4/4N3/8/8/8 w - - 0 1
Answer: White: Ne4 | Black: pd5
FEN: 8/8/8/8/8/8/5Q2/8 w - - 0 1
Answer: | White: Qf2 | Black: | synthetic | [
{
"role": "user",
"content": "List all pieces from this FEN position.\nFormat: \"White: pieces | Black: pieces\" using piece symbol + square (e.g., Ne4, pd5).\nUppercase for White, lowercase for Black.\n\nExample:\nFEN: 8/8/8/3p4/4N3/8/8/8 w - - 0 1\nAnswer: White: Ne4 | Black: pd5\n\nFEN: 8/8/8/8/8/8/5Q2/8... |
2kr1bnr/ppp2ppp/3qb3/8/1n6/P1Q2N2/1PP1PPPP/RNB1KB1R w KQ - 3 9 | puzzle_legal_moves | List all legal moves for the piece on h1 in this position.
Respond with ONLY the moves in SAN notation, comma-separated.
Example:
FEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
Piece on: b1
Answer: Na3, Nc3
FEN: 2kr1bnr/ppp2ppp/3qb3/8/1n6/P1Q2N2/1PP1PPPP/RNB1KB1R w KQ - 3 9
Piece on: h1
Answer: | Rg1 | lichess | [
{
"role": "user",
"content": "List all legal moves for the piece on h1 in this position.\nRespond with ONLY the moves in SAN notation, comma-separated.\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1\nPiece on: b1\nAnswer: Na3, Nc3\n\nFEN: 2kr1bnr/ppp2ppp/3qb3/8/1n6/P1Q2N2/1PP1PPP... |
r1b1kb1r/pp1n1ppp/R3p3/1NppP1B1/3P4/3B1N2/1qP2PPP/3QK2R b Kkq - 0 11 | puzzle_best_move | Find the best move for this chess puzzle. Respond with ONLY the move in UCI notation (e.g., e2e4).
Example 1:
FEN: 8/1r6/8/5k1p/2B4K/1P6/8/1R6 w - - 1 44
Answer: h4h5
Example 2:
FEN: 1r3rk1/pbp2p1p/1p4pb/3qp3/1n6/PP1PP1PP/NBPQ3K/R4RN1 w - - 2 18
Answer: a2b4
Now solve:
FEN: r1b1kb1r/pp1n1ppp/R3p3/1NppP1B1/3P4/3B1N2/... | b7a6 | lichess | [
{
"role": "user",
"content": "Find the best move for this chess puzzle. Respond with ONLY the move in UCI notation (e.g., e2e4).\n\nExample 1:\nFEN: 8/1r6/8/5k1p/2B4K/1P6/8/1R6 w - - 1 44\nAnswer: h4h5\n\nExample 2:\nFEN: 1r3rk1/pbp2p1p/1p4pb/3qp3/1n6/PP1PP1PP/NBPQ3K/R4RN1 w - - 2 18\nAnswer: a2b4\n\nNow so... |
6rk/2r5/1Q6/4q2p/p3P2P/5R2/1P3PP1/4R1K1 w - - 3 34 | puzzle_piece_captures | List all captures the piece on b6 can make.
Respond with ONLY the captures in SAN notation, comma-separated. If no captures, respond "none".
Example:
FEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4
Piece on: c4
Answer: Bxf7+
FEN: 6rk/2r5/1Q6/4q2p/p3P2P/5R2/1P3PP1/4R1K1 w - - 3 34
Piece on: b6... | Qxc7 | lichess | [
{
"role": "user",
"content": "List all captures the piece on b6 can make.\nRespond with ONLY the captures in SAN notation, comma-separated. If no captures, respond \"none\".\n\nExample:\nFEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4\nPiece on: c4\nAnswer: Bxf7+\n\nFEN: 6rk/2r5/1Q6... |
1R6/8/1p6/1p6/8/8/1p6/8 w - - 0 1 | toy_piece_list_to_fen | Generate the FEN for this position.
White to move, no castling rights.
Example:
Pieces: White: Ne4 | Black: pd5
Answer: 8/8/8/3p4/4N3/8/8/8 w - - 0 1
Pieces: White: Rb8 | Black: pb2, pb5, pb6
Answer: | 1R6/8/1p6/1p6/8/8/1p6/8 w - - 0 1 | synthetic | [
{
"role": "user",
"content": "Generate the FEN for this position.\nWhite to move, no castling rights.\n\nExample:\nPieces: White: Ne4 | Black: pd5\nAnswer: 8/8/8/3p4/4N3/8/8/8 w - - 0 1\n\nPieces: White: Rb8 | Black: pb2, pb5, pb6\nAnswer:"
},
{
"role": "assistant",
"content": "1R6/8/1p6/1p6/8/8... |
5k2/p2r3p/1p4pP/3r1q2/3Rp3/2P5/PP3PQ1/K3R3 w - - 0 33 | puzzle_piece_captures | List all captures the piece on g2 can make.
Respond with ONLY the captures in SAN notation, comma-separated. If no captures, respond "none".
Example:
FEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4
Piece on: c4
Answer: Bxf7+
FEN: 5k2/p2r3p/1p4pP/3r1q2/3Rp3/2P5/PP3PQ1/K3R3 w - - 0 33
Piece on:... | Qxg6, Qxe4 | lichess | [
{
"role": "user",
"content": "List all captures the piece on g2 can make.\nRespond with ONLY the captures in SAN notation, comma-separated. If no captures, respond \"none\".\n\nExample:\nFEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4\nPiece on: c4\nAnswer: Bxf7+\n\nFEN: 5k2/p2r3p/1... |
5k1r/1p3ppp/1p4b1/nB1P2B1/1P4P1/P4P2/3r3P/1K1R3R w - - 5 26 | puzzle_legal_moves | List all legal moves for the piece on b1 in this position.
Respond with ONLY the moves in SAN notation, comma-separated.
Example:
FEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
Piece on: b1
Answer: Na3, Nc3
FEN: 5k1r/1p3ppp/1p4b1/nB1P2B1/1P4P1/P4P2/3r3P/1K1R3R w - - 5 26
Piece on: b1
Answer: | Kc1, Ka1 | lichess | [
{
"role": "user",
"content": "List all legal moves for the piece on b1 in this position.\nRespond with ONLY the moves in SAN notation, comma-separated.\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1\nPiece on: b1\nAnswer: Na3, Nc3\n\nFEN: 5k1r/1p3ppp/1p4b1/nB1P2B1/1P4P1/P4P2/3r3P... |
8/6k1/2bb2pp/4pp2/4P1P1/3BBPKP/8/8 w - - 0 38 | puzzle_piece_captures | List all captures the piece on g4 can make.
Respond with ONLY the captures in SAN notation, comma-separated. If no captures, respond "none".
Example:
FEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4
Piece on: c4
Answer: Bxf7+
FEN: 8/6k1/2bb2pp/4pp2/4P1P1/3BBPKP/8/8 w - - 0 38
Piece on: g4
Answ... | gxf5 | lichess | [
{
"role": "user",
"content": "List all captures the piece on g4 can make.\nRespond with ONLY the captures in SAN notation, comma-separated. If no captures, respond \"none\".\n\nExample:\nFEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4\nPiece on: c4\nAnswer: Bxf7+\n\nFEN: 8/6k1/2bb2p... |
8/1p2rppk/5q1p/Q4R2/2P5/PP5P/5PP1/5rK1 w - - 0 32 | puzzle_piece_positions | List all pieces and their positions from this FEN.
Format: "White: pieces" then "Black: pieces", sorted by piece value (K, Q, R, B, N, P).
Example:
FEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1
Answer:
White: Ke1, Qd1, Ra1, Rh1, Bc1, Bf1, Nb1, Ng1, Pa2, Pb2, Pc2, Pd2, Pe4, Pf2, Pg2, Ph2
Black: Ke8, Q... | White: Kg1, Qa5, Rf5, Pa3, Pb3, Pc4, Pf2, Pg2, Ph3
Black: Kh7, Qf6, Re7, Rf1, Pb7, Pf7, Pg7, Ph6 | lichess | [
{
"role": "user",
"content": "List all pieces and their positions from this FEN.\nFormat: \"White: pieces\" then \"Black: pieces\", sorted by piece value (K, Q, R, B, N, P).\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1\nAnswer:\nWhite: Ke1, Qd1, Ra1, Rh1, Bc1, Bf1, Nb1, Ng1, ... |
r2qr1k1/ppp2ppp/4b3/3P4/1nP2Q2/2N2N1P/PP3KP1/R4R2 w - - 1 15 | puzzle_ascii_board | Generate an ASCII representation of this chess position.
Output ONLY the 8x8 grid. Use uppercase for White, lowercase for Black, dots for empty.
Example:
FEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1
Output:
r n b q k b n r
p p p p p p p p
. . . . . . . .
. . . . . . . .
. . . . P . . .
. . . . . . .... | r . . q r . k .
p p p . . p p p
. . . . b . . .
. . . P . . . .
. n P . . Q . .
. . N . . N . P
P P . . . K P .
R . . . . R . . | lichess | [
{
"role": "user",
"content": "Generate an ASCII representation of this chess position.\nOutput ONLY the 8x8 grid. Use uppercase for White, lowercase for Black, dots for empty.\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1\nOutput:\nr n b q k b n r\np p p p p p p p\n. . . . . .... |
5rk1/Q4ppp/3p4/1N2p1b1/4P3/5q1P/PPP2P2/1K1R3R w - - 0 20 | puzzle_legal_moves | List all legal moves for the piece on d1 in this position.
Respond with ONLY the moves in SAN notation, comma-separated.
Example:
FEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
Piece on: b1
Answer: Na3, Nc3
FEN: 5rk1/Q4ppp/3p4/1N2p1b1/4P3/5q1P/PPP2P2/1K1R3R w - - 0 20
Piece on: d1
Answer: | Rxd6, Rd5, Rd4, Rd3, Rd2, Rdg1, Rdf1, Rde1, Rc1 | lichess | [
{
"role": "user",
"content": "List all legal moves for the piece on d1 in this position.\nRespond with ONLY the moves in SAN notation, comma-separated.\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1\nPiece on: b1\nAnswer: Na3, Nc3\n\nFEN: 5rk1/Q4ppp/3p4/1N2p1b1/4P3/5q1P/PPP2P2/1K... |
r1bk1r2/pppp2pp/8/2PNnq2/5Q2/8/PPP3PP/R1B1R1K1 w - - 1 17 | puzzle_piece_positions | List all pieces and their positions from this FEN.
Format: "White: pieces" then "Black: pieces", sorted by piece value (K, Q, R, B, N, P).
Example:
FEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1
Answer:
White: Ke1, Qd1, Ra1, Rh1, Bc1, Bf1, Nb1, Ng1, Pa2, Pb2, Pc2, Pd2, Pe4, Pf2, Pg2, Ph2
Black: Ke8, Q... | White: Kg1, Qf4, Ra1, Re1, Bc1, Nd5, Pa2, Pb2, Pc2, Pc5, Pg2, Ph2
Black: Kd8, Qf5, Ra8, Rf8, Bc8, Ne5, Pa7, Pb7, Pc7, Pd7, Pg7, Ph7 | lichess | [
{
"role": "user",
"content": "List all pieces and their positions from this FEN.\nFormat: \"White: pieces\" then \"Black: pieces\", sorted by piece value (K, Q, R, B, N, P).\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1\nAnswer:\nWhite: Ke1, Qd1, Ra1, Rh1, Bc1, Bf1, Nb1, Ng1, ... |
8/8/8/8/8/N7/2p5/8 w - - 0 1 | toy_capture_sequence | Capture all black pawns with the white piece.
Respond with ONLY the move sequence in UCI notation, comma-separated.
Example:
Position (FEN): 8/8/8/3p4/4p3/2N5/8/8 w - - 0 1
Position (pieces): White: Nc3 | Black: pd5, pe4
Answer: c3e4, e4d5
Position (FEN): 8/8/8/8/8/N7/2p5/8 w - - 0 1
Position (pieces): White: Na3 | B... | a3c2 | synthetic | [
{
"role": "user",
"content": "Capture all black pawns with the white piece.\nRespond with ONLY the move sequence in UCI notation, comma-separated.\n\nExample:\nPosition (FEN): 8/8/8/3p4/4p3/2N5/8/8 w - - 0 1\nPosition (pieces): White: Nc3 | Black: pd5, pe4\nAnswer: c3e4, e4d5\n\nPosition (FEN): 8/8/8/8/8/N7... |
8/5p2/p3kP2/8/5r2/R1P5/4P3/4K3 b - - 2 52 | puzzle_piece_captures | List all captures the piece on f4 can make.
Respond with ONLY the captures in SAN notation, comma-separated. If no captures, respond "none".
Example:
FEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4
Piece on: c4
Answer: Bxf7+
FEN: 8/5p2/p3kP2/8/5r2/R1P5/4P3/4K3 b - - 2 52
Piece on: f4
Answer: | Rxf6 | lichess | [
{
"role": "user",
"content": "List all captures the piece on f4 can make.\nRespond with ONLY the captures in SAN notation, comma-separated. If no captures, respond \"none\".\n\nExample:\nFEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4\nPiece on: c4\nAnswer: Bxf7+\n\nFEN: 8/5p2/p3kP2... |
2R1Q3/3r2p1/5p1p/3bp1k1/4q3/6BP/5PPK/8 w - - 10 39 | puzzle_piece_captures | List all captures the piece on g3 can make.
Respond with ONLY the captures in SAN notation, comma-separated. If no captures, respond "none".
Example:
FEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4
Piece on: c4
Answer: Bxf7+
FEN: 2R1Q3/3r2p1/5p1p/3bp1k1/4q3/6BP/5PPK/8 w - - 10 39
Piece on: g3... | Bxe5 | lichess | [
{
"role": "user",
"content": "List all captures the piece on g3 can make.\nRespond with ONLY the captures in SAN notation, comma-separated. If no captures, respond \"none\".\n\nExample:\nFEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4\nPiece on: c4\nAnswer: Bxf7+\n\nFEN: 2R1Q3/3r2p1... |
8/8/8/8/8/8/8/Q7 w - - 0 1 | toy_movement_path | Move the piece to reach the target square using the shortest path.
Respond with ONLY the move sequence in UCI notation, comma-separated.
Example:
Position: White: Na1 |
Move from a1 to c5
Answer: a1b3, b3c5
Position: White: Qa1 | Black:
Move from a1 to e5
Answer: | a1e5 | synthetic | [
{
"role": "user",
"content": "Move the piece to reach the target square using the shortest path.\nRespond with ONLY the move sequence in UCI notation, comma-separated.\n\nExample:\nPosition: White: Na1 |\nMove from a1 to c5\nAnswer: a1b3, b3c5\n\nPosition: White: Qa1 | Black: \nMove from a1 to e5\nAnswer:"
... |
5r1k/1p3qbp/6p1/2P5/1P1Q4/8/6PP/3R1NK1 w - - 1 29 | puzzle_piece_positions | List all pieces and their positions from this FEN.
Format: "White: pieces" then "Black: pieces", sorted by piece value (K, Q, R, B, N, P).
Example:
FEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1
Answer:
White: Ke1, Qd1, Ra1, Rh1, Bc1, Bf1, Nb1, Ng1, Pa2, Pb2, Pc2, Pd2, Pe4, Pf2, Pg2, Ph2
Black: Ke8, Q... | White: Kg1, Qd4, Rd1, Nf1, Pb4, Pc5, Pg2, Ph2
Black: Kh8, Qf7, Rf8, Bg7, Pb7, Pg6, Ph7 | lichess | [
{
"role": "user",
"content": "List all pieces and their positions from this FEN.\nFormat: \"White: pieces\" then \"Black: pieces\", sorted by piece value (K, Q, R, B, N, P).\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1\nAnswer:\nWhite: Ke1, Qd1, Ra1, Rh1, Bc1, Bf1, Nb1, Ng1, ... |
3r4/5kp1/1pp5/6p1/1P1q1pN1/P3p2P/4Q1P1/5R1K w - - 2 33 | puzzle_piece_captures | List all captures the piece on f1 can make.
Respond with ONLY the captures in SAN notation, comma-separated. If no captures, respond "none".
Example:
FEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4
Piece on: c4
Answer: Bxf7+
FEN: 3r4/5kp1/1pp5/6p1/1P1q1pN1/P3p2P/4Q1P1/5R1K w - - 2 33
Piece on... | Rxf4+ | lichess | [
{
"role": "user",
"content": "List all captures the piece on f1 can make.\nRespond with ONLY the captures in SAN notation, comma-separated. If no captures, respond \"none\".\n\nExample:\nFEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4\nPiece on: c4\nAnswer: Bxf7+\n\nFEN: 3r4/5kp1/1p... |
r3r1k1/1pp2pp1/p1bb3p/6q1/2P5/1P2P2P/PBQN1PP1/R4RK1 w - - 1 16 | puzzle_best_move | Find the best move for this chess puzzle. Respond with ONLY the move in UCI notation (e.g., e2e4).
Example 1:
FEN: 8/1r6/8/5k1p/2B4K/1P6/8/1R6 w - - 1 44
Answer: h4h5
Example 2:
FEN: 1r3rk1/pbp2p1p/1p4pb/3qp3/1n6/PP1PP1PP/NBPQ3K/R4RN1 w - - 2 18
Answer: a2b4
Now solve:
FEN: r3r1k1/1pp2pp1/p1bb3p/6q1/2P5/1P2P2P/PBQN1... | f2f4 | lichess | [
{
"role": "user",
"content": "Find the best move for this chess puzzle. Respond with ONLY the move in UCI notation (e.g., e2e4).\n\nExample 1:\nFEN: 8/1r6/8/5k1p/2B4K/1P6/8/1R6 w - - 1 44\nAnswer: h4h5\n\nExample 2:\nFEN: 1r3rk1/pbp2p1p/1p4pb/3qp3/1n6/PP1PP1PP/NBPQ3K/R4RN1 w - - 2 18\nAnswer: a2b4\n\nNow so... |
r3k2r/pq1n1ppb/4p2p/4P3/Q1N3P1/1Pp1P2P/P4P2/R4RK1 b kq - 1 19 | puzzle_ascii_board | Generate an ASCII representation of this chess position.
Output ONLY the 8x8 grid. Use uppercase for White, lowercase for Black, dots for empty.
Example:
FEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1
Output:
r n b q k b n r
p p p p p p p p
. . . . . . . .
. . . . . . . .
. . . . P . . .
. . . . . . .... | r . . . k . . r
p q . n . p p b
. . . . p . . p
. . . . P . . .
Q . N . . . P .
. P p . P . . P
P . . . . P . .
R . . . . R K . | lichess | [
{
"role": "user",
"content": "Generate an ASCII representation of this chess position.\nOutput ONLY the 8x8 grid. Use uppercase for White, lowercase for Black, dots for empty.\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1\nOutput:\nr n b q k b n r\np p p p p p p p\n. . . . . .... |
5k2/3R2p1/4Kp1p/3p4/2r3P1/5P2/6P1/8 b - - 2 41 | puzzle_legal_captures | List all legal captures in this position.
Respond with ONLY the captures in SAN notation, comma-separated. If no captures, respond "none".
Example:
FEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4
Answer: Bxf7+
FEN: 5k2/3R2p1/4Kp1p/3p4/2r3P1/5P2/6P1/8 b - - 2 41
Answer: | Rxg4 | lichess | [
{
"role": "user",
"content": "List all legal captures in this position.\nRespond with ONLY the captures in SAN notation, comma-separated. If no captures, respond \"none\".\n\nExample:\nFEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4\nAnswer: Bxf7+\n\nFEN: 5k2/3R2p1/4Kp1p/3p4/2r3P1/5... |
8/3p4/4p3/8/6p1/7B/8/8 w - - 0 1 | toy_capture_sequence | Capture all black pawns with the white piece.
Respond with ONLY the move sequence in UCI notation, comma-separated.
Example:
Position (FEN): 8/8/8/3p4/4p3/2N5/8/8 w - - 0 1
Position (pieces): White: Nc3 | Black: pd5, pe4
Answer: c3e4, e4d5
Position (FEN): 8/3p4/4p3/8/6p1/7B/8/8 w - - 0 1
Position (pieces): White: Bh3... | h3g4, g4e6, e6d7 | synthetic | [
{
"role": "user",
"content": "Capture all black pawns with the white piece.\nRespond with ONLY the move sequence in UCI notation, comma-separated.\n\nExample:\nPosition (FEN): 8/8/8/3p4/4p3/2N5/8/8 w - - 0 1\nPosition (pieces): White: Nc3 | Black: pd5, pe4\nAnswer: c3e4, e4d5\n\nPosition (FEN): 8/3p4/4p3/8/... |
r4rk1/p1p1bpp1/2pp2b1/4n1Pp/4P2P/1BN2P1q/PPP2K2/R1BQ3R b - - 6 17 | puzzle_piece_captures | List all captures the piece on h3 can make.
Respond with ONLY the captures in SAN notation, comma-separated. If no captures, respond "none".
Example:
FEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4
Piece on: c4
Answer: Bxf7+
FEN: r4rk1/p1p1bpp1/2pp2b1/4n1Pp/4P2P/1BN2P1q/PPP2K2/R1BQ3R b - - 6 ... | Qxh4+, Qxf3+, Qxh1 | lichess | [
{
"role": "user",
"content": "List all captures the piece on h3 can make.\nRespond with ONLY the captures in SAN notation, comma-separated. If no captures, respond \"none\".\n\nExample:\nFEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4\nPiece on: c4\nAnswer: Bxf7+\n\nFEN: r4rk1/p1p1b... |
1Q6/5ppk/7p/2pr4/4p3/4P3/2p2PPP/R5K1 w - - 1 36 | puzzle_legal_moves | List all legal moves for the piece on g2 in this position.
Respond with ONLY the moves in SAN notation, comma-separated.
Example:
FEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
Piece on: b1
Answer: Na3, Nc3
FEN: 1Q6/5ppk/7p/2pr4/4p3/4P3/2p2PPP/R5K1 w - - 1 36
Piece on: g2
Answer: | g3, g4 | lichess | [
{
"role": "user",
"content": "List all legal moves for the piece on g2 in this position.\nRespond with ONLY the moves in SAN notation, comma-separated.\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1\nPiece on: b1\nAnswer: Na3, Nc3\n\nFEN: 1Q6/5ppk/7p/2pr4/4p3/4P3/2p2PPP/R5K1 w - ... |
7r/ppp1Nk1p/2n5/8/8/2P2pP1/P6P/R1Br1BK1 b - - 0 20 | puzzle_legal_moves | List all legal moves for the piece on h7 in this position.
Respond with ONLY the moves in SAN notation, comma-separated.
Example:
FEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
Piece on: b1
Answer: Na3, Nc3
FEN: 7r/ppp1Nk1p/2n5/8/8/2P2pP1/P6P/R1Br1BK1 b - - 0 20
Piece on: h7
Answer: | h6, h5 | lichess | [
{
"role": "user",
"content": "List all legal moves for the piece on h7 in this position.\nRespond with ONLY the moves in SAN notation, comma-separated.\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1\nPiece on: b1\nAnswer: Na3, Nc3\n\nFEN: 7r/ppp1Nk1p/2n5/8/8/2P2pP1/P6P/R1Br1BK1 b... |
8/bp1N3r/2p1k2p/3n1p2/7B/3B4/P4PPP/1N4K1 b - - 0 26 | puzzle_piece_captures | List all captures the piece on h7 can make.
Respond with ONLY the captures in SAN notation, comma-separated. If no captures, respond "none".
Example:
FEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4
Piece on: c4
Answer: Bxf7+
FEN: 8/bp1N3r/2p1k2p/3n1p2/7B/3B4/P4PPP/1N4K1 b - - 0 26
Piece on: h... | Rxd7 | lichess | [
{
"role": "user",
"content": "List all captures the piece on h7 can make.\nRespond with ONLY the captures in SAN notation, comma-separated. If no captures, respond \"none\".\n\nExample:\nFEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4\nPiece on: c4\nAnswer: Bxf7+\n\nFEN: 8/bp1N3r/2p... |
1N6/3p4/8/8/8/8/8/8 w - - 0 1 | toy_piece_list_to_fen | Generate the FEN for this position.
White to move, no castling rights.
Example:
Pieces: White: Ne4 | Black: pd5
Answer: 8/8/8/3p4/4N3/8/8/8 w - - 0 1
Pieces: White: Nb8 | Black: pd7
Answer: | 1N6/3p4/8/8/8/8/8/8 w - - 0 1 | synthetic | [
{
"role": "user",
"content": "Generate the FEN for this position.\nWhite to move, no castling rights.\n\nExample:\nPieces: White: Ne4 | Black: pd5\nAnswer: 8/8/8/3p4/4N3/8/8/8 w - - 0 1\n\nPieces: White: Nb8 | Black: pd7\nAnswer:"
},
{
"role": "assistant",
"content": "1N6/3p4/8/8/8/8/8/8 w - - 0... |
1q3bk1/5ppp/8/3QP3/2B5/6NP/6PK/4r3 b - - 3 38 | puzzle_best_move | Find the best move for this chess puzzle. Respond with ONLY the move in UCI notation (e.g., e2e4).
Example 1:
FEN: 8/1r6/8/5k1p/2B4K/1P6/8/1R6 w - - 1 44
Answer: h4h5
Example 2:
FEN: 1r3rk1/pbp2p1p/1p4pb/3qp3/1n6/PP1PP1PP/NBPQ3K/R4RN1 w - - 2 18
Answer: a2b4
Now solve:
FEN: 1q3bk1/5ppp/8/3QP3/2B5/6NP/6PK/4r3 b - - 3... | e1e5 | lichess | [
{
"role": "user",
"content": "Find the best move for this chess puzzle. Respond with ONLY the move in UCI notation (e.g., e2e4).\n\nExample 1:\nFEN: 8/1r6/8/5k1p/2B4K/1P6/8/1R6 w - - 1 44\nAnswer: h4h5\n\nExample 2:\nFEN: 1r3rk1/pbp2p1p/1p4pb/3qp3/1n6/PP1PP1PP/NBPQ3K/R4RN1 w - - 2 18\nAnswer: a2b4\n\nNow so... |
5r2/p3p1kp/1p4p1/4rp2/2P5/3P1Q1P/R3K1P1/2q2BNR w - - 7 32 | puzzle_best_move | Find the best move for this chess puzzle. Respond with ONLY the move in UCI notation (e.g., e2e4).
Example 1:
FEN: 8/1r6/8/5k1p/2B4K/1P6/8/1R6 w - - 1 44
Answer: h4h5
Example 2:
FEN: 1r3rk1/pbp2p1p/1p4pb/3qp3/1n6/PP1PP1PP/NBPQ3K/R4RN1 w - - 2 18
Answer: a2b4
Now solve:
FEN: 5r2/p3p1kp/1p4p1/4rp2/2P5/3P1Q1P/R3K1P1/2q... | e2f2 | lichess | [
{
"role": "user",
"content": "Find the best move for this chess puzzle. Respond with ONLY the move in UCI notation (e.g., e2e4).\n\nExample 1:\nFEN: 8/1r6/8/5k1p/2B4K/1P6/8/1R6 w - - 1 44\nAnswer: h4h5\n\nExample 2:\nFEN: 1r3rk1/pbp2p1p/1p4pb/3qp3/1n6/PP1PP1PP/NBPQ3K/R4RN1 w - - 2 18\nAnswer: a2b4\n\nNow so... |
5rk1/1p3rpp/p5p1/2pBq3/2Pb4/1Q4P1/PP3PP1/R4RK1 w - - 10 26 | puzzle_ascii_board | Generate an ASCII representation of this chess position.
Output ONLY the 8x8 grid. Use uppercase for White, lowercase for Black, dots for empty.
Example:
FEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1
Output:
r n b q k b n r
p p p p p p p p
. . . . . . . .
. . . . . . . .
. . . . P . . .
. . . . . . .... | . . . . . r k .
. p . . . r p p
p . . . . . p .
. . p B q . . .
. . P b . . . .
. Q . . . . P .
P P . . . P P .
R . . . . R K . | lichess | [
{
"role": "user",
"content": "Generate an ASCII representation of this chess position.\nOutput ONLY the 8x8 grid. Use uppercase for White, lowercase for Black, dots for empty.\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1\nOutput:\nr n b q k b n r\np p p p p p p p\n. . . . . .... |
8/1R4pk/r7/6PK/r7/7P/8/8 b - - 1 41 | puzzle_ascii_board | Generate an ASCII representation of this chess position.
Output ONLY the 8x8 grid. Use uppercase for White, lowercase for Black, dots for empty.
Example:
FEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1
Output:
r n b q k b n r
p p p p p p p p
. . . . . . . .
. . . . . . . .
. . . . P . . .
. . . . . . .... | . . . . . . . .
. R . . . . p k
r . . . . . . .
. . . . . . P K
r . . . . . . .
. . . . . . . P
. . . . . . . .
. . . . . . . . | lichess | [
{
"role": "user",
"content": "Generate an ASCII representation of this chess position.\nOutput ONLY the 8x8 grid. Use uppercase for White, lowercase for Black, dots for empty.\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1\nOutput:\nr n b q k b n r\np p p p p p p p\n. . . . . .... |
r5k1/2R3pp/p7/4Pp2/1P3P2/4P3/1P3P1r/R4K2 w - - 1 28 | puzzle_piece_positions | List all pieces and their positions from this FEN.
Format: "White: pieces" then "Black: pieces", sorted by piece value (K, Q, R, B, N, P).
Example:
FEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1
Answer:
White: Ke1, Qd1, Ra1, Rh1, Bc1, Bf1, Nb1, Ng1, Pa2, Pb2, Pc2, Pd2, Pe4, Pf2, Pg2, Ph2
Black: Ke8, Q... | White: Kf1, Ra1, Rc7, Pb2, Pb4, Pe3, Pe5, Pf2, Pf4
Black: Kg8, Ra8, Rh2, Pa6, Pf5, Pg7, Ph7 | lichess | [
{
"role": "user",
"content": "List all pieces and their positions from this FEN.\nFormat: \"White: pieces\" then \"Black: pieces\", sorted by piece value (K, Q, R, B, N, P).\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1\nAnswer:\nWhite: Ke1, Qd1, Ra1, Rh1, Bc1, Bf1, Nb1, Ng1, ... |
1k1r4/pp3pp1/2p1p3/4b3/P3n1P1/8/KPP2PN1/3rBR1R b - - 2 31 | puzzle_legal_moves | List all legal moves for the piece on e5 in this position.
Respond with ONLY the moves in SAN notation, comma-separated.
Example:
FEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
Piece on: b1
Answer: Na3, Nc3
FEN: 1k1r4/pp3pp1/2p1p3/4b3/P3n1P1/8/KPP2PN1/3rBR1R b - - 2 31
Piece on: e5
Answer: | Bc7, Bf6, Bd6, Bf4, Bd4, Bg3, Bc3, Bh2, Bxb2 | lichess | [
{
"role": "user",
"content": "List all legal moves for the piece on e5 in this position.\nRespond with ONLY the moves in SAN notation, comma-separated.\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1\nPiece on: b1\nAnswer: Na3, Nc3\n\nFEN: 1k1r4/pp3pp1/2p1p3/4b3/P3n1P1/8/KPP2PN1/3... |
1r2R1k1/2Q4p/pp6/2p2n2/P2P1P1q/2P4P/2PB2b1/4R1K1 b - - 0 29 | puzzle_legal_moves | List all legal moves for the piece on b8 in this position.
Respond with ONLY the moves in SAN notation, comma-separated.
Example:
FEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
Piece on: b1
Answer: Na3, Nc3
FEN: 1r2R1k1/2Q4p/pp6/2p2n2/P2P1P1q/2P4P/2PB2b1/4R1K1 b - - 0 29
Piece on: b8
Answer: | Rxe8 | lichess | [
{
"role": "user",
"content": "List all legal moves for the piece on b8 in this position.\nRespond with ONLY the moves in SAN notation, comma-separated.\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1\nPiece on: b1\nAnswer: Na3, Nc3\n\nFEN: 1r2R1k1/2Q4p/pp6/2p2n2/P2P1P1q/2P4P/2PB2b... |
r4rk1/ppqbppbp/3p1np1/3N4/2PQ4/1P4P1/PB2PPBP/R4RK1 b - - 4 12 | puzzle_legal_moves | List all legal moves for the piece on g6 in this position.
Respond with ONLY the moves in SAN notation, comma-separated.
Example:
FEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
Piece on: b1
Answer: Na3, Nc3
FEN: r4rk1/ppqbppbp/3p1np1/3N4/2PQ4/1P4P1/PB2PPBP/R4RK1 b - - 4 12
Piece on: g6
Answer: | g5 | lichess | [
{
"role": "user",
"content": "List all legal moves for the piece on g6 in this position.\nRespond with ONLY the moves in SAN notation, comma-separated.\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1\nPiece on: b1\nAnswer: Na3, Nc3\n\nFEN: r4rk1/ppqbppbp/3p1np1/3N4/2PQ4/1P4P1/PB2P... |
r3k1nr/pp3pp1/1bn2q1p/4p3/6b1/2PPBNP1/PP3PBP/RN1Q1RK1 w kq - 2 11 | puzzle_piece_captures | List all captures the piece on e3 can make.
Respond with ONLY the captures in SAN notation, comma-separated. If no captures, respond "none".
Example:
FEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4
Piece on: c4
Answer: Bxf7+
FEN: r3k1nr/pp3pp1/1bn2q1p/4p3/6b1/2PPBNP1/PP3PBP/RN1Q1RK1 w kq - 2 ... | Bxh6, Bxb6 | lichess | [
{
"role": "user",
"content": "List all captures the piece on e3 can make.\nRespond with ONLY the captures in SAN notation, comma-separated. If no captures, respond \"none\".\n\nExample:\nFEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4\nPiece on: c4\nAnswer: Bxf7+\n\nFEN: r3k1nr/pp3p... |
2k3r1/2p2pq1/p3p3/3p4/1PnP1P2/P1N1P3/4QKP1/R4R2 w - - 7 32 | puzzle_legal_captures | List all legal captures in this position.
Respond with ONLY the captures in SAN notation, comma-separated. If no captures, respond "none".
Example:
FEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4
Answer: Bxf7+
FEN: 2k3r1/2p2pq1/p3p3/3p4/1PnP1P2/P1N1P3/4QKP1/R4R2 w - - 7 32
Answer: | Nxd5, Qxc4 | lichess | [
{
"role": "user",
"content": "List all legal captures in this position.\nRespond with ONLY the captures in SAN notation, comma-separated. If no captures, respond \"none\".\n\nExample:\nFEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4\nAnswer: Bxf7+\n\nFEN: 2k3r1/2p2pq1/p3p3/3p4/1PnP1... |
r4rk1/pp3ppp/2p2q2/3p4/4n3/1P1BQN2/1K3PPP/3R3R w - - 2 18 | puzzle_legal_moves | List all legal moves for the piece on e3 in this position.
Respond with ONLY the moves in SAN notation, comma-separated.
Example:
FEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
Piece on: b1
Answer: Na3, Nc3
FEN: r4rk1/pp3ppp/2p2q2/3p4/4n3/1P1BQN2/1K3PPP/3R3R w - - 2 18
Piece on: e3
Answer: | Qd4 | lichess | [
{
"role": "user",
"content": "List all legal moves for the piece on e3 in this position.\nRespond with ONLY the moves in SAN notation, comma-separated.\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1\nPiece on: b1\nAnswer: Na3, Nc3\n\nFEN: r4rk1/pp3ppp/2p2q2/3p4/4n3/1P1BQN2/1K3PPP... |
r1b1k2r/pppp1ppp/6n1/3Pp3/1bP1P3/2N1BPP1/PPQ1B1P1/R4KNq b kq - 1 11 | puzzle_ascii_board | Generate an ASCII representation of this chess position.
Output ONLY the 8x8 grid. Use uppercase for White, lowercase for Black, dots for empty.
Example:
FEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1
Output:
r n b q k b n r
p p p p p p p p
. . . . . . . .
. . . . . . . .
. . . . P . . .
. . . . . . .... | r . b . k . . r
p p p p . p p p
. . . . . . n .
. . . P p . . .
. b P . P . . .
. . N . B P P .
P P Q . B . P .
R . . . . K N q | lichess | [
{
"role": "user",
"content": "Generate an ASCII representation of this chess position.\nOutput ONLY the 8x8 grid. Use uppercase for White, lowercase for Black, dots for empty.\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1\nOutput:\nr n b q k b n r\np p p p p p p p\n. . . . . .... |
7B/8/8/8/8/8/8/8 w - - 0 1 | toy_piece_list_to_legal_moves_uci | List all legal moves for the white piece in UCI notation, comma-separated.
Position (pieces): White: Bh8 | Black:
Answer: | h8a1, h8b2, h8c3, h8d4, h8e5, h8f6, h8g7 | synthetic | [
{
"role": "user",
"content": "List all legal moves for the white piece in UCI notation, comma-separated.\n\nPosition (pieces): White: Bh8 | Black: \nAnswer:"
},
{
"role": "assistant",
"content": "h8a1, h8b2, h8c3, h8d4, h8e5, h8f6, h8g7"
}
] |
r1bqk2r/pp1nbppp/3p4/1B1p4/3P1B2/8/PPP2PPP/R2QK1NR w KQkq - 2 9 | puzzle_best_move | Find the best move for this chess puzzle. Respond with ONLY the move in UCI notation (e.g., e2e4).
Example 1:
FEN: 8/1r6/8/5k1p/2B4K/1P6/8/1R6 w - - 1 44
Answer: h4h5
Example 2:
FEN: 1r3rk1/pbp2p1p/1p4pb/3qp3/1n6/PP1PP1PP/NBPQ3K/R4RN1 w - - 2 18
Answer: a2b4
Now solve:
FEN: r1bqk2r/pp1nbppp/3p4/1B1p4/3P1B2/8/PPP2PPP... | g1f3 | lichess | [
{
"role": "user",
"content": "Find the best move for this chess puzzle. Respond with ONLY the move in UCI notation (e.g., e2e4).\n\nExample 1:\nFEN: 8/1r6/8/5k1p/2B4K/1P6/8/1R6 w - - 1 44\nAnswer: h4h5\n\nExample 2:\nFEN: 1r3rk1/pbp2p1p/1p4pb/3qp3/1n6/PP1PP1PP/NBPQ3K/R4RN1 w - - 2 18\nAnswer: a2b4\n\nNow so... |
r5k1/5pp1/2p5/P1N4p/2Pp1n2/1P3P2/5P1P/3R2K1 w - - 1 26 | puzzle_best_move | Find the best move for this chess puzzle. Respond with ONLY the move in UCI notation (e.g., e2e4).
Example 1:
FEN: 8/1r6/8/5k1p/2B4K/1P6/8/1R6 w - - 1 44
Answer: h4h5
Example 2:
FEN: 1r3rk1/pbp2p1p/1p4pb/3qp3/1n6/PP1PP1PP/NBPQ3K/R4RN1 w - - 2 18
Answer: a2b4
Now solve:
FEN: r5k1/5pp1/2p5/P1N4p/2Pp1n2/1P3P2/5P1P/3R2K... | d1d4 | lichess | [
{
"role": "user",
"content": "Find the best move for this chess puzzle. Respond with ONLY the move in UCI notation (e.g., e2e4).\n\nExample 1:\nFEN: 8/1r6/8/5k1p/2B4K/1P6/8/1R6 w - - 1 44\nAnswer: h4h5\n\nExample 2:\nFEN: 1r3rk1/pbp2p1p/1p4pb/3qp3/1n6/PP1PP1PP/NBPQ3K/R4RN1 w - - 2 18\nAnswer: a2b4\n\nNow so... |
8/1p6/8/8/8/5Q2/8/8 w - - 0 1 | toy_piece_list_to_fen | Generate the FEN for this position.
White to move, no castling rights.
Example:
Pieces: White: Ne4 | Black: pd5
Answer: 8/8/8/3p4/4N3/8/8/8 w - - 0 1
Pieces: White: Qf3 | Black: pb7
Answer: | 8/1p6/8/8/8/5Q2/8/8 w - - 0 1 | synthetic | [
{
"role": "user",
"content": "Generate the FEN for this position.\nWhite to move, no castling rights.\n\nExample:\nPieces: White: Ne4 | Black: pd5\nAnswer: 8/8/8/3p4/4N3/8/8/8 w - - 0 1\n\nPieces: White: Qf3 | Black: pb7\nAnswer:"
},
{
"role": "assistant",
"content": "8/1p6/8/8/8/5Q2/8/8 w - - 0... |
2r2rk1/1R4pp/p7/2Np4/8/4b3/P1R3PP/3Q1q1K w - - 2 30 | puzzle_piece_positions | List all pieces and their positions from this FEN.
Format: "White: pieces" then "Black: pieces", sorted by piece value (K, Q, R, B, N, P).
Example:
FEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1
Answer:
White: Ke1, Qd1, Ra1, Rh1, Bc1, Bf1, Nb1, Ng1, Pa2, Pb2, Pc2, Pd2, Pe4, Pf2, Pg2, Ph2
Black: Ke8, Q... | White: Kh1, Qd1, Rb7, Rc2, Nc5, Pa2, Pg2, Ph2
Black: Kg8, Qf1, Rc8, Rf8, Be3, Pa6, Pd5, Pg7, Ph7 | lichess | [
{
"role": "user",
"content": "List all pieces and their positions from this FEN.\nFormat: \"White: pieces\" then \"Black: pieces\", sorted by piece value (K, Q, R, B, N, P).\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1\nAnswer:\nWhite: Ke1, Qd1, Ra1, Rh1, Bc1, Bf1, Nb1, Ng1, ... |
1R6/8/8/1p6/8/1p6/8/8 w - - 0 1 | toy_fen_to_legal_moves_uci | List all legal moves for the white piece in UCI notation, comma-separated.
Example:
Position (FEN): 8/8/8/8/4N3/8/8/8 w - - 0 1
Position (pieces): White: Ne4 | Black:
Answer: e4c3, e4c5, e4d2, e4d6, e4f2, e4f6, e4g3, e4g5
Position (FEN): 1R6/8/8/1p6/8/1p6/8/8 w - - 0 1
Position (pieces): White: Rb8 | Black: pb3, pb5
... | b8a8, b8b5, b8b6, b8b7, b8c8, b8d8, b8e8, b8f8, b8g8, b8h8 | synthetic | [
{
"role": "user",
"content": "List all legal moves for the white piece in UCI notation, comma-separated.\n\nExample:\nPosition (FEN): 8/8/8/8/4N3/8/8/8 w - - 0 1\nPosition (pieces): White: Ne4 | Black:\nAnswer: e4c3, e4c5, e4d2, e4d6, e4f2, e4f6, e4g3, e4g5\n\nPosition (FEN): 1R6/8/8/1p6/8/1p6/8/8 w - - 0 1... |
8/8/5Q2/6p1/7p/8/8/8 w - - 0 1 | toy_fen_to_piece_list | List all pieces from this FEN position.
Format: "White: pieces | Black: pieces" using piece symbol + square (e.g., Ne4, pd5).
Uppercase for White, lowercase for Black.
Example:
FEN: 8/8/8/3p4/4N3/8/8/8 w - - 0 1
Answer: White: Ne4 | Black: pd5
FEN: 8/8/5Q2/6p1/7p/8/8/8 w - - 0 1
Answer: | White: Qf6 | Black: pg5, ph4 | synthetic | [
{
"role": "user",
"content": "List all pieces from this FEN position.\nFormat: \"White: pieces | Black: pieces\" using piece symbol + square (e.g., Ne4, pd5).\nUppercase for White, lowercase for Black.\n\nExample:\nFEN: 8/8/8/3p4/4N3/8/8/8 w - - 0 1\nAnswer: White: Ne4 | Black: pd5\n\nFEN: 8/8/5Q2/6p1/7p/8/... |
rn3b1r/pp2pkp1/2pq1n2/3p4/3P1NpP/3Q4/PPP2P2/RNB1K2R b KQ - 3 11 | puzzle_ascii_board | Generate an ASCII representation of this chess position.
Output ONLY the 8x8 grid. Use uppercase for White, lowercase for Black, dots for empty.
Example:
FEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1
Output:
r n b q k b n r
p p p p p p p p
. . . . . . . .
. . . . . . . .
. . . . P . . .
. . . . . . .... | r n . . . b . r
p p . . p k p .
. . p q . n . .
. . . p . . . .
. . . P . N p P
. . . Q . . . .
P P P . . P . .
R N B . K . . R | lichess | [
{
"role": "user",
"content": "Generate an ASCII representation of this chess position.\nOutput ONLY the 8x8 grid. Use uppercase for White, lowercase for Black, dots for empty.\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1\nOutput:\nr n b q k b n r\np p p p p p p p\n. . . . . .... |
r2q1rk1/pb2p1b1/1p1pNnQ1/2p4p/3P3P/2P1P1B1/PP3P2/R3K1R1 b Q - 2 17 | puzzle_piece_captures | List all captures the piece on c5 can make.
Respond with ONLY the captures in SAN notation, comma-separated. If no captures, respond "none".
Example:
FEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4
Piece on: c4
Answer: Bxf7+
FEN: r2q1rk1/pb2p1b1/1p1pNnQ1/2p4p/3P3P/2P1P1B1/PP3P2/R3K1R1 b Q - 2... | cxd4 | lichess | [
{
"role": "user",
"content": "List all captures the piece on c5 can make.\nRespond with ONLY the captures in SAN notation, comma-separated. If no captures, respond \"none\".\n\nExample:\nFEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4\nPiece on: c4\nAnswer: Bxf7+\n\nFEN: r2q1rk1/pb2... |
8/2R5/2p2bk1/2Np4/4p3/P7/1Pn1K3/8 w - - 1 49 | puzzle_piece_captures | List all captures the piece on c7 can make.
Respond with ONLY the captures in SAN notation, comma-separated. If no captures, respond "none".
Example:
FEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4
Piece on: c4
Answer: Bxf7+
FEN: 8/2R5/2p2bk1/2Np4/4p3/P7/1Pn1K3/8 w - - 1 49
Piece on: c7
Answe... | Rxc6 | lichess | [
{
"role": "user",
"content": "List all captures the piece on c7 can make.\nRespond with ONLY the captures in SAN notation, comma-separated. If no captures, respond \"none\".\n\nExample:\nFEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4\nPiece on: c4\nAnswer: Bxf7+\n\nFEN: 8/2R5/2p2bk... |
8/8/8/8/8/8/8/3R4 w - - 0 1 | toy_fen_to_piece_list | List all pieces from this FEN position.
Format: "White: pieces | Black: pieces" using piece symbol + square (e.g., Ne4, pd5).
Uppercase for White, lowercase for Black.
Example:
FEN: 8/8/8/3p4/4N3/8/8/8 w - - 0 1
Answer: White: Ne4 | Black: pd5
FEN: 8/8/8/8/8/8/8/3R4 w - - 0 1
Answer: | White: Rd1 | Black: | synthetic | [
{
"role": "user",
"content": "List all pieces from this FEN position.\nFormat: \"White: pieces | Black: pieces\" using piece symbol + square (e.g., Ne4, pd5).\nUppercase for White, lowercase for Black.\n\nExample:\nFEN: 8/8/8/3p4/4N3/8/8/8 w - - 0 1\nAnswer: White: Ne4 | Black: pd5\n\nFEN: 8/8/8/8/8/8/8/3R4... |
3r4/p4ppk/2q4p/2NpPb2/1P1Q4/2P2P2/P6P/3R3K w - - 11 41 | puzzle_legal_captures | List all legal captures in this position.
Respond with ONLY the captures in SAN notation, comma-separated. If no captures, respond "none".
Example:
FEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4
Answer: Bxf7+
FEN: 3r4/p4ppk/2q4p/2NpPb2/1P1Q4/2P2P2/P6P/3R3K w - - 11 41
Answer: | Qxd5 | lichess | [
{
"role": "user",
"content": "List all legal captures in this position.\nRespond with ONLY the captures in SAN notation, comma-separated. If no captures, respond \"none\".\n\nExample:\nFEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4\nAnswer: Bxf7+\n\nFEN: 3r4/p4ppk/2q4p/2NpPb2/1P1Q4... |
rBbqk2r/1p3ppp/p3pn2/8/1b1P4/2N2N1P/PP3PP1/R2QKB1R b KQkq - 0 10 | puzzle_ascii_board | Generate an ASCII representation of this chess position.
Output ONLY the 8x8 grid. Use uppercase for White, lowercase for Black, dots for empty.
Example:
FEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1
Output:
r n b q k b n r
p p p p p p p p
. . . . . . . .
. . . . . . . .
. . . . P . . .
. . . . . . .... | r B b q k . . r
. p . . . p p p
p . . . p n . .
. . . . . . . .
. b . P . . . .
. . N . . N . P
P P . . . P P .
R . . Q K B . R | lichess | [
{
"role": "user",
"content": "Generate an ASCII representation of this chess position.\nOutput ONLY the 8x8 grid. Use uppercase for White, lowercase for Black, dots for empty.\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1\nOutput:\nr n b q k b n r\np p p p p p p p\n. . . . . .... |
2k3rr/1pp1n3/p2qp1Bp/3p3Q/8/2N1P2P/PPPP2Rb/R1B2K2 w - - 0 24 | puzzle_best_move | Find the best move for this chess puzzle. Respond with ONLY the move in UCI notation (e.g., e2e4).
Example 1:
FEN: 8/1r6/8/5k1p/2B4K/1P6/8/1R6 w - - 1 44
Answer: h4h5
Example 2:
FEN: 1r3rk1/pbp2p1p/1p4pb/3qp3/1n6/PP1PP1PP/NBPQ3K/R4RN1 w - - 2 18
Answer: a2b4
Now solve:
FEN: 2k3rr/1pp1n3/p2qp1Bp/3p3Q/8/2N1P2P/PPPP2Rb... | g6f7 | lichess | [
{
"role": "user",
"content": "Find the best move for this chess puzzle. Respond with ONLY the move in UCI notation (e.g., e2e4).\n\nExample 1:\nFEN: 8/1r6/8/5k1p/2B4K/1P6/8/1R6 w - - 1 44\nAnswer: h4h5\n\nExample 2:\nFEN: 1r3rk1/pbp2p1p/1p4pb/3qp3/1n6/PP1PP1PP/NBPQ3K/R4RN1 w - - 2 18\nAnswer: a2b4\n\nNow so... |
7k/1ppq1p2/3p1n1p/p2Pp2b/P1P1P2P/3Qb3/1BB3PK/R7 w - - 0 33 | puzzle_legal_captures | List all legal captures in this position.
Respond with ONLY the captures in SAN notation, comma-separated. If no captures, respond "none".
Example:
FEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4
Answer: Bxf7+
FEN: 7k/1ppq1p2/3p1n1p/p2Pp2b/P1P1P2P/3Qb3/1BB3PK/R7 w - - 0 33
Answer: | Qxe3, Bxe5 | lichess | [
{
"role": "user",
"content": "List all legal captures in this position.\nRespond with ONLY the captures in SAN notation, comma-separated. If no captures, respond \"none\".\n\nExample:\nFEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4\nAnswer: Bxf7+\n\nFEN: 7k/1ppq1p2/3p1n1p/p2Pp2b/P1... |
r1b2rk1/pp3pp1/3b3p/3Bn3/P2N1q2/2P4P/1P3PP1/RN1Q1RK1 w - - 1 17 | puzzle_best_move | Find the best move for this chess puzzle. Respond with ONLY the move in UCI notation (e.g., e2e4).
Example 1:
FEN: 8/1r6/8/5k1p/2B4K/1P6/8/1R6 w - - 1 44
Answer: h4h5
Example 2:
FEN: 1r3rk1/pbp2p1p/1p4pb/3qp3/1n6/PP1PP1PP/NBPQ3K/R4RN1 w - - 2 18
Answer: a2b4
Now solve:
FEN: r1b2rk1/pp3pp1/3b3p/3Bn3/P2N1q2/2P4P/1P3PP... | d4e2 | lichess | [
{
"role": "user",
"content": "Find the best move for this chess puzzle. Respond with ONLY the move in UCI notation (e.g., e2e4).\n\nExample 1:\nFEN: 8/1r6/8/5k1p/2B4K/1P6/8/1R6 w - - 1 44\nAnswer: h4h5\n\nExample 2:\nFEN: 1r3rk1/pbp2p1p/1p4pb/3qp3/1n6/PP1PP1PP/NBPQ3K/R4RN1 w - - 2 18\nAnswer: a2b4\n\nNow so... |
5rk1/2p2pp1/2p1n1rp/p2qP3/3P4/PPP1Q2P/1B4P1/R4R1K w - - 1 28 | puzzle_legal_moves | List all legal moves for the piece on a3 in this position.
Respond with ONLY the moves in SAN notation, comma-separated.
Example:
FEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
Piece on: b1
Answer: Na3, Nc3
FEN: 5rk1/2p2pp1/2p1n1rp/p2qP3/3P4/PPP1Q2P/1B4P1/R4R1K w - - 1 28
Piece on: a3
Answer: | a4 | lichess | [
{
"role": "user",
"content": "List all legal moves for the piece on a3 in this position.\nRespond with ONLY the moves in SAN notation, comma-separated.\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1\nPiece on: b1\nAnswer: Na3, Nc3\n\nFEN: 5rk1/2p2pp1/2p1n1rp/p2qP3/3P4/PPP1Q2P/1B4... |
2r2rk1/5ppp/bq2p3/p1ppP1N1/Pb1P2P1/1P2P2P/2QN4/2R1K2R b K - 1 18 | puzzle_piece_positions | List all pieces and their positions from this FEN.
Format: "White: pieces" then "Black: pieces", sorted by piece value (K, Q, R, B, N, P).
Example:
FEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1
Answer:
White: Ke1, Qd1, Ra1, Rh1, Bc1, Bf1, Nb1, Ng1, Pa2, Pb2, Pc2, Pd2, Pe4, Pf2, Pg2, Ph2
Black: Ke8, Q... | White: Ke1, Qc2, Rc1, Rh1, Nd2, Ng5, Pa4, Pb3, Pd4, Pe3, Pe5, Pg4, Ph3
Black: Kg8, Qb6, Rc8, Rf8, Ba6, Bb4, Pa5, Pc5, Pd5, Pe6, Pf7, Pg7, Ph7 | lichess | [
{
"role": "user",
"content": "List all pieces and their positions from this FEN.\nFormat: \"White: pieces\" then \"Black: pieces\", sorted by piece value (K, Q, R, B, N, P).\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1\nAnswer:\nWhite: Ke1, Qd1, Ra1, Rh1, Bc1, Bf1, Nb1, Ng1, ... |
6nr/pp3p1p/k1p5/8/1QN5/2P1P3/4KPqP/8 b - - 5 26 | puzzle_ascii_board | Generate an ASCII representation of this chess position.
Output ONLY the 8x8 grid. Use uppercase for White, lowercase for Black, dots for empty.
Example:
FEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1
Output:
r n b q k b n r
p p p p p p p p
. . . . . . . .
. . . . . . . .
. . . . P . . .
. . . . . . .... | . . . . . . n r
p p . . . p . p
k . p . . . . .
. . . . . . . .
. Q N . . . . .
. . P . P . . .
. . . . K P q P
. . . . . . . . | lichess | [
{
"role": "user",
"content": "Generate an ASCII representation of this chess position.\nOutput ONLY the 8x8 grid. Use uppercase for White, lowercase for Black, dots for empty.\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1\nOutput:\nr n b q k b n r\np p p p p p p p\n. . . . . .... |
r4r2/p1p2k1R/6R1/3n1pB1/1q1Pb3/8/1P2Q1PP/6K1 b - - 2 35 | puzzle_legal_moves | List all legal moves for the piece on f7 in this position.
Respond with ONLY the moves in SAN notation, comma-separated.
Example:
FEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
Piece on: b1
Answer: Na3, Nc3
FEN: r4r2/p1p2k1R/6R1/3n1pB1/1q1Pb3/8/1P2Q1PP/6K1 b - - 2 35
Piece on: f7
Answer: | Ke8, Kxg6 | lichess | [
{
"role": "user",
"content": "List all legal moves for the piece on f7 in this position.\nRespond with ONLY the moves in SAN notation, comma-separated.\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1\nPiece on: b1\nAnswer: Na3, Nc3\n\nFEN: r4r2/p1p2k1R/6R1/3n1pB1/1q1Pb3/8/1P2Q1PP/... |
rn1q1rk1/1b2bpp1/p3p2p/1pp1P3/3P4/2NQ1N2/PPB2PPP/3R1RK1 b - - 1 14 | puzzle_piece_positions | List all pieces and their positions from this FEN.
Format: "White: pieces" then "Black: pieces", sorted by piece value (K, Q, R, B, N, P).
Example:
FEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1
Answer:
White: Ke1, Qd1, Ra1, Rh1, Bc1, Bf1, Nb1, Ng1, Pa2, Pb2, Pc2, Pd2, Pe4, Pf2, Pg2, Ph2
Black: Ke8, Q... | White: Kg1, Qd3, Rd1, Rf1, Bc2, Nc3, Nf3, Pa2, Pb2, Pd4, Pe5, Pf2, Pg2, Ph2
Black: Kg8, Qd8, Ra8, Rf8, Bb7, Be7, Nb8, Pa6, Pb5, Pc5, Pe6, Pf7, Pg7, Ph6 | lichess | [
{
"role": "user",
"content": "List all pieces and their positions from this FEN.\nFormat: \"White: pieces\" then \"Black: pieces\", sorted by piece value (K, Q, R, B, N, P).\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1\nAnswer:\nWhite: Ke1, Qd1, Ra1, Rh1, Bc1, Bf1, Nb1, Ng1, ... |
8/8/8/1R6/8/8/8/8 w - - 0 1 | toy_fen_to_legal_moves_uci | List all legal moves for the white piece in UCI notation, comma-separated.
Example:
Position (FEN): 8/8/8/8/4N3/8/8/8 w - - 0 1
Position (pieces): White: Ne4 | Black:
Answer: e4c3, e4c5, e4d2, e4d6, e4f2, e4f6, e4g3, e4g5
Position (FEN): 8/8/8/1R6/8/8/8/8 w - - 0 1
Position (pieces): White: Rb5 | Black:
Answer: | b5a5, b5b1, b5b2, b5b3, b5b4, b5b6, b5b7, b5b8, b5c5, b5d5, b5e5, b5f5, b5g5, b5h5 | synthetic | [
{
"role": "user",
"content": "List all legal moves for the white piece in UCI notation, comma-separated.\n\nExample:\nPosition (FEN): 8/8/8/8/4N3/8/8/8 w - - 0 1\nPosition (pieces): White: Ne4 | Black:\nAnswer: e4c3, e4c5, e4d2, e4d6, e4f2, e4f6, e4g3, e4g5\n\nPosition (FEN): 8/8/8/1R6/8/8/8/8 w - - 0 1\nPo... |
4Q3/8/8/8/8/8/8/8 w - - 0 1 | toy_piece_list_to_fen | Generate the FEN for this position.
White to move, no castling rights.
Example:
Pieces: White: Ne4 | Black: pd5
Answer: 8/8/8/3p4/4N3/8/8/8 w - - 0 1
Pieces: White: Qe8 | Black:
Answer: | 4Q3/8/8/8/8/8/8/8 w - - 0 1 | synthetic | [
{
"role": "user",
"content": "Generate the FEN for this position.\nWhite to move, no castling rights.\n\nExample:\nPieces: White: Ne4 | Black: pd5\nAnswer: 8/8/8/3p4/4N3/8/8/8 w - - 0 1\n\nPieces: White: Qe8 | Black: \nAnswer:"
},
{
"role": "assistant",
"content": "4Q3/8/8/8/8/8/8/8 w - - 0 1"
... |
2r3kR/Q7/5q2/1brpN3/5Pp1/4P1P1/6K1/1B6 b - - 2 43 | puzzle_piece_positions | List all pieces and their positions from this FEN.
Format: "White: pieces" then "Black: pieces", sorted by piece value (K, Q, R, B, N, P).
Example:
FEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1
Answer:
White: Ke1, Qd1, Ra1, Rh1, Bc1, Bf1, Nb1, Ng1, Pa2, Pb2, Pc2, Pd2, Pe4, Pf2, Pg2, Ph2
Black: Ke8, Q... | White: Kg2, Qa7, Rh8, Bb1, Ne5, Pe3, Pf4, Pg3
Black: Kg8, Qf6, Rc5, Rc8, Bb5, Pd5, Pg4 | lichess | [
{
"role": "user",
"content": "List all pieces and their positions from this FEN.\nFormat: \"White: pieces\" then \"Black: pieces\", sorted by piece value (K, Q, R, B, N, P).\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1\nAnswer:\nWhite: Ke1, Qd1, Ra1, Rh1, Bc1, Bf1, Nb1, Ng1, ... |
rn3rk1/pbp2ppp/1p2p3/3qNnB1/3P4/2PB4/P1P1QPPP/R4RK1 w - - 1 13 | puzzle_ascii_board | Generate an ASCII representation of this chess position.
Output ONLY the 8x8 grid. Use uppercase for White, lowercase for Black, dots for empty.
Example:
FEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1
Output:
r n b q k b n r
p p p p p p p p
. . . . . . . .
. . . . . . . .
. . . . P . . .
. . . . . . .... | r n . . . r k .
p b p . . p p p
. p . . p . . .
. . . q N n B .
. . . P . . . .
. . P B . . . .
P . P . Q P P P
R . . . . R K . | lichess | [
{
"role": "user",
"content": "Generate an ASCII representation of this chess position.\nOutput ONLY the 8x8 grid. Use uppercase for White, lowercase for Black, dots for empty.\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1\nOutput:\nr n b q k b n r\np p p p p p p p\n. . . . . .... |
5r2/p2pbN1Q/1k3qp1/1p4p1/4R3/2PP4/PP3PPP/R5K1 w - - 2 22 | puzzle_best_move | Find the best move for this chess puzzle. Respond with ONLY the move in UCI notation (e.g., e2e4).
Example 1:
FEN: 8/1r6/8/5k1p/2B4K/1P6/8/1R6 w - - 1 44
Answer: h4h5
Example 2:
FEN: 1r3rk1/pbp2p1p/1p4pb/3qp3/1n6/PP1PP1PP/NBPQ3K/R4RN1 w - - 2 18
Answer: a2b4
Now solve:
FEN: 5r2/p2pbN1Q/1k3qp1/1p4p1/4R3/2PP4/PP3PPP/R... | f7e5 | lichess | [
{
"role": "user",
"content": "Find the best move for this chess puzzle. Respond with ONLY the move in UCI notation (e.g., e2e4).\n\nExample 1:\nFEN: 8/1r6/8/5k1p/2B4K/1P6/8/1R6 w - - 1 44\nAnswer: h4h5\n\nExample 2:\nFEN: 1r3rk1/pbp2p1p/1p4pb/3qp3/1n6/PP1PP1PP/NBPQ3K/R4RN1 w - - 2 18\nAnswer: a2b4\n\nNow so... |
8/8/8/8/8/8/3B4/8 w - - 0 1 | toy_piece_list_to_legal_moves_uci | List all legal moves for the white piece in UCI notation, comma-separated.
Position (pieces): White: Bd2 | Black:
Answer: | d2a5, d2b4, d2c1, d2c3, d2e1, d2e3, d2f4, d2g5, d2h6 | synthetic | [
{
"role": "user",
"content": "List all legal moves for the white piece in UCI notation, comma-separated.\n\nPosition (pieces): White: Bd2 | Black: \nAnswer:"
},
{
"role": "assistant",
"content": "d2a5, d2b4, d2c1, d2c3, d2e1, d2e3, d2f4, d2g5, d2h6"
}
] |
6R1/6p1/8/6p1/8/8/8/8 w - - 0 1 | toy_capture_sequence | Capture all black pawns with the white piece.
Respond with ONLY the move sequence in UCI notation, comma-separated.
Example:
Position (FEN): 8/8/8/3p4/4p3/2N5/8/8 w - - 0 1
Position (pieces): White: Nc3 | Black: pd5, pe4
Answer: c3e4, e4d5
Position (FEN): 6R1/6p1/8/6p1/8/8/8/8 w - - 0 1
Position (pieces): White: Rg8 ... | g8g7, g7g5 | synthetic | [
{
"role": "user",
"content": "Capture all black pawns with the white piece.\nRespond with ONLY the move sequence in UCI notation, comma-separated.\n\nExample:\nPosition (FEN): 8/8/8/3p4/4p3/2N5/8/8 w - - 0 1\nPosition (pieces): White: Nc3 | Black: pd5, pe4\nAnswer: c3e4, e4d5\n\nPosition (FEN): 6R1/6p1/8/6p... |
8/7p/5Kpk/5p2/8/4p1Pr/8/4R3 b - - 3 43 | puzzle_ascii_board | Generate an ASCII representation of this chess position.
Output ONLY the 8x8 grid. Use uppercase for White, lowercase for Black, dots for empty.
Example:
FEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1
Output:
r n b q k b n r
p p p p p p p p
. . . . . . . .
. . . . . . . .
. . . . P . . .
. . . . . . .... | . . . . . . . .
. . . . . . . p
. . . . . K p k
. . . . . p . .
. . . . . . . .
. . . . p . P r
. . . . . . . .
. . . . R . . . | lichess | [
{
"role": "user",
"content": "Generate an ASCII representation of this chess position.\nOutput ONLY the 8x8 grid. Use uppercase for White, lowercase for Black, dots for empty.\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1\nOutput:\nr n b q k b n r\np p p p p p p p\n. . . . . .... |
5rk1/p3ppbp/3p2p1/q5P1/2nPQ3/2N5/Pr2N2P/R1B2K1B w - - 0 20 | puzzle_ascii_board | Generate an ASCII representation of this chess position.
Output ONLY the 8x8 grid. Use uppercase for White, lowercase for Black, dots for empty.
Example:
FEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1
Output:
r n b q k b n r
p p p p p p p p
. . . . . . . .
. . . . . . . .
. . . . P . . .
. . . . . . .... | . . . . . r k .
p . . . p p b p
. . . p . . p .
q . . . . . P .
. . n P Q . . .
. . N . . . . .
P r . . N . . P
R . B . . K . B | lichess | [
{
"role": "user",
"content": "Generate an ASCII representation of this chess position.\nOutput ONLY the 8x8 grid. Use uppercase for White, lowercase for Black, dots for empty.\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1\nOutput:\nr n b q k b n r\np p p p p p p p\n. . . . . .... |
6rk/2r5/1Q6/4q2p/p3P2P/5R2/1P3PP1/4R1K1 w - - 3 34 | puzzle_best_move | Find the best move for this chess puzzle. Respond with ONLY the move in UCI notation (e.g., e2e4).
Example 1:
FEN: 8/1r6/8/5k1p/2B4K/1P6/8/1R6 w - - 1 44
Answer: h4h5
Example 2:
FEN: 1r3rk1/pbp2p1p/1p4pb/3qp3/1n6/PP1PP1PP/NBPQ3K/R4RN1 w - - 2 18
Answer: a2b4
Now solve:
FEN: 6rk/2r5/1Q6/4q2p/p3P2P/5R2/1P3PP1/4R1K1 w ... | e1e3 | lichess | [
{
"role": "user",
"content": "Find the best move for this chess puzzle. Respond with ONLY the move in UCI notation (e.g., e2e4).\n\nExample 1:\nFEN: 8/1r6/8/5k1p/2B4K/1P6/8/1R6 w - - 1 44\nAnswer: h4h5\n\nExample 2:\nFEN: 1r3rk1/pbp2p1p/1p4pb/3qp3/1n6/PP1PP1PP/NBPQ3K/R4RN1 w - - 2 18\nAnswer: a2b4\n\nNow so... |
3Q4/p3Nppk/1p2q2p/2p1b3/2P1p3/4P2P/PP3PP1/6K1 b - - 13 35 | puzzle_piece_positions | List all pieces and their positions from this FEN.
Format: "White: pieces" then "Black: pieces", sorted by piece value (K, Q, R, B, N, P).
Example:
FEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1
Answer:
White: Ke1, Qd1, Ra1, Rh1, Bc1, Bf1, Nb1, Ng1, Pa2, Pb2, Pc2, Pd2, Pe4, Pf2, Pg2, Ph2
Black: Ke8, Q... | White: Kg1, Qd8, Ne7, Pa2, Pb2, Pc4, Pe3, Pf2, Pg2, Ph3
Black: Kh7, Qe6, Be5, Pa7, Pb6, Pc5, Pe4, Pf7, Pg7, Ph6 | lichess | [
{
"role": "user",
"content": "List all pieces and their positions from this FEN.\nFormat: \"White: pieces\" then \"Black: pieces\", sorted by piece value (K, Q, R, B, N, P).\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1\nAnswer:\nWhite: Ke1, Qd1, Ra1, Rh1, Bc1, Bf1, Nb1, Ng1, ... |
3r2k1/7p/3b4/p5q1/P2Q1p2/1PN4P/1P4P1/5RK1 w - - 2 33 | puzzle_best_move | Find the best move for this chess puzzle. Respond with ONLY the move in UCI notation (e.g., e2e4).
Example 1:
FEN: 8/1r6/8/5k1p/2B4K/1P6/8/1R6 w - - 1 44
Answer: h4h5
Example 2:
FEN: 1r3rk1/pbp2p1p/1p4pb/3qp3/1n6/PP1PP1PP/NBPQ3K/R4RN1 w - - 2 18
Answer: a2b4
Now solve:
FEN: 3r2k1/7p/3b4/p5q1/P2Q1p2/1PN4P/1P4P1/5RK1 ... | d4d5 | lichess | [
{
"role": "user",
"content": "Find the best move for this chess puzzle. Respond with ONLY the move in UCI notation (e.g., e2e4).\n\nExample 1:\nFEN: 8/1r6/8/5k1p/2B4K/1P6/8/1R6 w - - 1 44\nAnswer: h4h5\n\nExample 2:\nFEN: 1r3rk1/pbp2p1p/1p4pb/3qp3/1n6/PP1PP1PP/NBPQ3K/R4RN1 w - - 2 18\nAnswer: a2b4\n\nNow so... |
8/8/8/8/8/4B3/8/8 w - - 0 1 | toy_piece_list_to_legal_moves_uci | List all legal moves for the white piece in UCI notation, comma-separated.
Position (pieces): White: Be3 | Black:
Answer: | e3a7, e3b6, e3c1, e3c5, e3d2, e3d4, e3f2, e3f4, e3g1, e3g5, e3h6 | synthetic | [
{
"role": "user",
"content": "List all legal moves for the white piece in UCI notation, comma-separated.\n\nPosition (pieces): White: Be3 | Black: \nAnswer:"
},
{
"role": "assistant",
"content": "e3a7, e3b6, e3c1, e3c5, e3d2, e3d4, e3f2, e3f4, e3g1, e3g5, e3h6"
}
] |
2k3r1/p4prp/8/2p5/8/NPPp1P2/PB1P1K1P/4R3 w - - 6 23 | puzzle_legal_moves | List all legal moves for the piece on a3 in this position.
Respond with ONLY the moves in SAN notation, comma-separated.
Example:
FEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
Piece on: b1
Answer: Na3, Nc3
FEN: 2k3r1/p4prp/8/2p5/8/NPPp1P2/PB1P1K1P/4R3 w - - 6 23
Piece on: a3
Answer: | Nb5, Nc4, Nc2, Nb1 | lichess | [
{
"role": "user",
"content": "List all legal moves for the piece on a3 in this position.\nRespond with ONLY the moves in SAN notation, comma-separated.\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1\nPiece on: b1\nAnswer: Na3, Nc3\n\nFEN: 2k3r1/p4prp/8/2p5/8/NPPp1P2/PB1P1K1P/4R3 ... |
3r3r/4bk2/1RQ1p3/3pP2p/P2n4/5p1P/6P1/R5K1 w - - 0 31 | puzzle_piece_positions | List all pieces and their positions from this FEN.
Format: "White: pieces" then "Black: pieces", sorted by piece value (K, Q, R, B, N, P).
Example:
FEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1
Answer:
White: Ke1, Qd1, Ra1, Rh1, Bc1, Bf1, Nb1, Ng1, Pa2, Pb2, Pc2, Pd2, Pe4, Pf2, Pg2, Ph2
Black: Ke8, Q... | White: Kg1, Qc6, Ra1, Rb6, Pa4, Pe5, Pg2, Ph3
Black: Kf7, Rd8, Rh8, Be7, Nd4, Pd5, Pe6, Pf3, Ph5 | lichess | [
{
"role": "user",
"content": "List all pieces and their positions from this FEN.\nFormat: \"White: pieces\" then \"Black: pieces\", sorted by piece value (K, Q, R, B, N, P).\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1\nAnswer:\nWhite: Ke1, Qd1, Ra1, Rh1, Bc1, Bf1, Nb1, Ng1, ... |
r4rk1/pb2ppb1/1q6/6PQ/8/2NP1N2/PPnK1PP1/R6R b - - 1 16 | puzzle_legal_moves | List all legal moves for the piece on g7 in this position.
Respond with ONLY the moves in SAN notation, comma-separated.
Example:
FEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
Piece on: b1
Answer: Na3, Nc3
FEN: r4rk1/pb2ppb1/1q6/6PQ/8/2NP1N2/PPnK1PP1/R6R b - - 1 16
Piece on: g7
Answer: | Bh8, Bh6, Bf6, Be5, Bd4, Bxc3+ | lichess | [
{
"role": "user",
"content": "List all legal moves for the piece on g7 in this position.\nRespond with ONLY the moves in SAN notation, comma-separated.\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1\nPiece on: b1\nAnswer: Na3, Nc3\n\nFEN: r4rk1/pb2ppb1/1q6/6PQ/8/2NP1N2/PPnK1PP1/R... |
rQ4k1/5ppp/4p3/4P2P/4P3/p3P1P1/PR4K1/2qr4 b - - 1 29 | puzzle_piece_captures | List all captures the piece on a8 can make.
Respond with ONLY the captures in SAN notation, comma-separated. If no captures, respond "none".
Example:
FEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4
Piece on: c4
Answer: Bxf7+
FEN: rQ4k1/5ppp/4p3/4P2P/4P3/p3P1P1/PR4K1/2qr4 b - - 1 29
Piece on: ... | Rxb8 | lichess | [
{
"role": "user",
"content": "List all captures the piece on a8 can make.\nRespond with ONLY the captures in SAN notation, comma-separated. If no captures, respond \"none\".\n\nExample:\nFEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4\nPiece on: c4\nAnswer: Bxf7+\n\nFEN: rQ4k1/5ppp/... |
6R1/p4p1p/2p1pp1k/8/2N5/4b1R1/4K1PP/2q5 b - - 1 29 | puzzle_piece_captures | List all captures the piece on c1 can make.
Respond with ONLY the captures in SAN notation, comma-separated. If no captures, respond "none".
Example:
FEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4
Piece on: c4
Answer: Bxf7+
FEN: 6R1/p4p1p/2p1pp1k/8/2N5/4b1R1/4K1PP/2q5 b - - 1 29
Piece on: c1... | Qxc4+ | lichess | [
{
"role": "user",
"content": "List all captures the piece on c1 can make.\nRespond with ONLY the captures in SAN notation, comma-separated. If no captures, respond \"none\".\n\nExample:\nFEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4\nPiece on: c4\nAnswer: Bxf7+\n\nFEN: 6R1/p4p1p/2... |
2r2rk1/pp3p1p/q2p2pP/6P1/2R5/2Q1P3/4KP2/3R1B2 b - - 0 29 | puzzle_piece_captures | List all captures the piece on c8 can make.
Respond with ONLY the captures in SAN notation, comma-separated. If no captures, respond "none".
Example:
FEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4
Piece on: c4
Answer: Bxf7+
FEN: 2r2rk1/pp3p1p/q2p2pP/6P1/2R5/2Q1P3/4KP2/3R1B2 b - - 0 29
Piece ... | Rxc4 | lichess | [
{
"role": "user",
"content": "List all captures the piece on c8 can make.\nRespond with ONLY the captures in SAN notation, comma-separated. If no captures, respond \"none\".\n\nExample:\nFEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4\nPiece on: c4\nAnswer: Bxf7+\n\nFEN: 2r2rk1/pp3p... |
1r1k3r/2Nppp1p/1bp3pn/B7/4P3/8/PPP2PPP/1R3RK1 w - - 1 18 | puzzle_piece_captures | List all captures the piece on a5 can make.
Respond with ONLY the captures in SAN notation, comma-separated. If no captures, respond "none".
Example:
FEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4
Piece on: c4
Answer: Bxf7+
FEN: 1r1k3r/2Nppp1p/1bp3pn/B7/4P3/8/PPP2PPP/1R3RK1 w - - 1 18
Piece ... | Bxb6 | lichess | [
{
"role": "user",
"content": "List all captures the piece on a5 can make.\nRespond with ONLY the captures in SAN notation, comma-separated. If no captures, respond \"none\".\n\nExample:\nFEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4\nPiece on: c4\nAnswer: Bxf7+\n\nFEN: 1r1k3r/2Npp... |
4rr1k/1p4pp/p7/8/6Q1/1Bb5/PP3PPP/6K1 w - - 0 26 | puzzle_legal_captures | List all legal captures in this position.
Respond with ONLY the captures in SAN notation, comma-separated. If no captures, respond "none".
Example:
FEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4
Answer: Bxf7+
FEN: 4rr1k/1p4pp/p7/8/6Q1/1Bb5/PP3PPP/6K1 w - - 0 26
Answer: | Qxg7+, bxc3 | lichess | [
{
"role": "user",
"content": "List all legal captures in this position.\nRespond with ONLY the captures in SAN notation, comma-separated. If no captures, respond \"none\".\n\nExample:\nFEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4\nAnswer: Bxf7+\n\nFEN: 4rr1k/1p4pp/p7/8/6Q1/1Bb5/P... |
r3r1k1/ppp2p2/1b5Q/3PP2n/2B3bq/2N5/PP4PP/R4R1K w - - 1 18 | puzzle_best_move | Find the best move for this chess puzzle. Respond with ONLY the move in UCI notation (e.g., e2e4).
Example 1:
FEN: 8/1r6/8/5k1p/2B4K/1P6/8/1R6 w - - 1 44
Answer: h4h5
Example 2:
FEN: 1r3rk1/pbp2p1p/1p4pb/3qp3/1n6/PP1PP1PP/NBPQ3K/R4RN1 w - - 2 18
Answer: a2b4
Now solve:
FEN: r3r1k1/ppp2p2/1b5Q/3PP2n/2B3bq/2N5/PP4PP/R... | f1f7 | lichess | [
{
"role": "user",
"content": "Find the best move for this chess puzzle. Respond with ONLY the move in UCI notation (e.g., e2e4).\n\nExample 1:\nFEN: 8/1r6/8/5k1p/2B4K/1P6/8/1R6 w - - 1 44\nAnswer: h4h5\n\nExample 2:\nFEN: 1r3rk1/pbp2p1p/1p4pb/3qp3/1n6/PP1PP1PP/NBPQ3K/R4RN1 w - - 2 18\nAnswer: a2b4\n\nNow so... |
8/2R5/8/8/8/8/8/8 w - - 0 1 | toy_piece_list_to_fen | Generate the FEN for this position.
White to move, no castling rights.
Example:
Pieces: White: Ne4 | Black: pd5
Answer: 8/8/8/3p4/4N3/8/8/8 w - - 0 1
Pieces: White: Rc7 | Black:
Answer: | 8/2R5/8/8/8/8/8/8 w - - 0 1 | synthetic | [
{
"role": "user",
"content": "Generate the FEN for this position.\nWhite to move, no castling rights.\n\nExample:\nPieces: White: Ne4 | Black: pd5\nAnswer: 8/8/8/3p4/4N3/8/8/8 w - - 0 1\n\nPieces: White: Rc7 | Black: \nAnswer:"
},
{
"role": "assistant",
"content": "8/2R5/8/8/8/8/8/8 w - - 0 1"
... |
1Q6/8/8/8/8/8/8/8 w - - 0 1 | toy_piece_list_to_fen | Generate the FEN for this position.
White to move, no castling rights.
Example:
Pieces: White: Ne4 | Black: pd5
Answer: 8/8/8/3p4/4N3/8/8/8 w - - 0 1
Pieces: White: Qb8 | Black:
Answer: | 1Q6/8/8/8/8/8/8/8 w - - 0 1 | synthetic | [
{
"role": "user",
"content": "Generate the FEN for this position.\nWhite to move, no castling rights.\n\nExample:\nPieces: White: Ne4 | Black: pd5\nAnswer: 8/8/8/3p4/4N3/8/8/8 w - - 0 1\n\nPieces: White: Qb8 | Black: \nAnswer:"
},
{
"role": "assistant",
"content": "1Q6/8/8/8/8/8/8/8 w - - 0 1"
... |
2kr1b1r/p1p2pp1/2pqb3/7p/3N2n1/2NPB3/PPP2PPP/R2Q1RK1 w - - 2 13 | puzzle_legal_moves | List all legal moves for the piece on d4 in this position.
Respond with ONLY the moves in SAN notation, comma-separated.
Example:
FEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
Piece on: b1
Answer: Na3, Nc3
FEN: 2kr1b1r/p1p2pp1/2pqb3/7p/3N2n1/2NPB3/PPP2PPP/R2Q1RK1 w - - 2 13
Piece on: d4
Answer: | Nxe6, Nxc6, Nf5, Ndb5, Nf3, Nb3, Nde2 | lichess | [
{
"role": "user",
"content": "List all legal moves for the piece on d4 in this position.\nRespond with ONLY the moves in SAN notation, comma-separated.\n\nExample:\nFEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1\nPiece on: b1\nAnswer: Na3, Nc3\n\nFEN: 2kr1b1r/p1p2pp1/2pqb3/7p/3N2n1/2NPB3/PPP2... |
R4rk1/2PR1ppp/8/8/7P/8/P3pqPK/8 b - - 0 33 | puzzle_legal_captures | List all legal captures in this position.
Respond with ONLY the captures in SAN notation, comma-separated. If no captures, respond "none".
Example:
FEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4
Answer: Bxf7+
FEN: R4rk1/2PR1ppp/8/8/7P/8/P3pqPK/8 b - - 0 33
Answer: | Rxa8, Qxh4+, Qxg2+ | lichess | [
{
"role": "user",
"content": "List all legal captures in this position.\nRespond with ONLY the captures in SAN notation, comma-separated. If no captures, respond \"none\".\n\nExample:\nFEN: r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4\nAnswer: Bxf7+\n\nFEN: R4rk1/2PR1ppp/8/8/7P/8/P3pq... |
2R5/8/8/8/2p5/8/8/8 w - - 0 1 | toy_fen_to_piece_list | List all pieces from this FEN position.
Format: "White: pieces | Black: pieces" using piece symbol + square (e.g., Ne4, pd5).
Uppercase for White, lowercase for Black.
Example:
FEN: 8/8/8/3p4/4N3/8/8/8 w - - 0 1
Answer: White: Ne4 | Black: pd5
FEN: 2R5/8/8/8/2p5/8/8/8 w - - 0 1
Answer: | White: Rc8 | Black: pc4 | synthetic | [
{
"role": "user",
"content": "List all pieces from this FEN position.\nFormat: \"White: pieces | Black: pieces\" using piece symbol + square (e.g., Ne4, pd5).\nUppercase for White, lowercase for Black.\n\nExample:\nFEN: 8/8/8/3p4/4N3/8/8/8 w - - 0 1\nAnswer: White: Ne4 | Black: pd5\n\nFEN: 2R5/8/8/8/2p5/8/8... |
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