Upload README.md

README.md

@@ -1,341 +1,436 @@
 ---
-dataset_info:
-  features:
-  - name: id
-    dtype: string
-  - name: game_id
-    dtype: string
-  - name: source
-    dtype: string
-  - name: source_type
-    dtype: string
-  - name: fen
-    dtype: string
-  - name: board_utf8
-    dtype: string
-  - name: board_ascii
-    dtype: string
-  - name: side_to_move
-    dtype: string
-  - name: ply
-    dtype: int64
-  - name: game_phase
-    dtype: string
-  - name: fullmove_number
-    dtype: int64
-  - name: legal_moves_uci
-    dtype: string
-  - name: legal_moves_san
-    dtype: string
-  - name: num_legal_moves
-    dtype: int64
-  - name: material_white
-    dtype: int64
-  - name: material_black
-    dtype: int64
-  - name: material_diff
-    dtype: int64
-  - name: material_total
-    dtype: int64
-  - name: white_pawns
-    dtype: int64
-  - name: white_knights
-    dtype: int64
-  - name: white_bishops
-    dtype: int64
-  - name: white_rooks
-    dtype: int64
-  - name: white_queens
-    dtype: int64
-  - name: black_pawns
-    dtype: int64
-  - name: black_knights
-    dtype: int64
-  - name: black_bishops
-    dtype: int64
-  - name: black_rooks
-    dtype: int64
-  - name: black_queens
-    dtype: int64
-  - name: has_bishop_pair_white
-    dtype: bool
-  - name: has_bishop_pair_black
-    dtype: bool
-  - name: is_queenless
-    dtype: bool
-  - name: white_king_castled_short
-    dtype: bool
-  - name: white_king_castled_long
-    dtype: bool
-  - name: white_king_in_center
-    dtype: bool
-  - name: white_king_zone_attacks
-    dtype: int64
-  - name: black_king_castled_short
-    dtype: bool
-  - name: black_king_castled_long
-    dtype: bool
-  - name: black_king_in_center
-    dtype: bool
-  - name: black_king_zone_attacks
-    dtype: int64
-  - name: is_check
-    dtype: bool
-  - name: num_checkers
-    dtype: int64
-  - name: num_checking_moves
-    dtype: int64
-  - name: num_capture_moves
-    dtype: int64
-  - name: max_capture_value
-    dtype: int64
-  - name: white_doubled_pawns
-    dtype: int64
-  - name: white_passed_pawns
-    dtype: int64
-  - name: black_doubled_pawns
-    dtype: int64
-  - name: black_passed_pawns
-    dtype: int64
-  - name: white_center_control
-    dtype: int64
-  - name: black_center_control
-    dtype: int64
-  - name: is_stalemate
-    dtype: bool
-  - name: is_insufficient_material
-    dtype: bool
-  - name: can_claim_draw
-    dtype: bool
-  - name: halfmove_clock
-    dtype: int64
-  - name: is_fifty_move_possible
-    dtype: bool
-  - name: board_tension
-    dtype: int64
-  - name: current_cp
-    dtype: int64
-  - name: current_mate
-    dtype: int64
-  - name: current_eval_desc
-    dtype: string
-  - name: current_eval_category
-    dtype: string
-  - name: best_move_uci
-    dtype: string
-  - name: best_move_san
-    dtype: string
-  - name: best_move_cp
-    dtype: int64
-  - name: best_move_mate
-    dtype: int64
-  - name: best_move_is_capture
-    dtype: bool
-  - name: best_move_captured_piece
-    dtype: string
-  - name: best_move_captured_value
-    dtype: int64
-  - name: best_move_is_check
-    dtype: bool
-  - name: best_move_is_checkmate
-    dtype: bool
-  - name: best_move_is_castling
-    dtype: bool
-  - name: best_move_is_promotion
-    dtype: bool
-  - name: best_move_promotion_piece
-    dtype: string
-  - name: best_move_piece_moved
-    dtype: string
-  - name: best_move_from
-    dtype: string
-  - name: best_move_to
-    dtype: string
-  - name: best_move_category
-    dtype: string
-  - name: best_move_is_sacrifice
-    dtype: bool
-  - name: best_move_sacrifice_type
-    dtype: 'null'
-  - name: best_move_material_sacrificed
-    dtype: int64
-  - name: best_move_creates_threats
-    dtype: bool
-  - name: best_move_num_new_attacks
-    dtype: int64
-  - name: best_move_total_threat_value
-    dtype: int64
-  - name: best_move_attacks_queen
-    dtype: bool
-  - name: best_move_attacks_rook
-    dtype: bool
-  - name: best_move_attacks_minor
-    dtype: bool
-  - name: best_move_new_attacks_json
-    dtype: string
-  - name: best_move_creates_fork
-    dtype: bool
-  - name: best_move_creates_pin
-    dtype: bool
-  - name: best_move_pinned_piece
-    dtype: string
-  - name: best_move_creates_skewer
-    dtype: bool
-  - name: best_move_is_discovered_attack
-    dtype: bool
-  - name: position_had_hanging_piece
-    dtype: bool
-  - name: position_hanging_piece_value
-    dtype: int64
-  - name: best_move_saves_hanging
-    dtype: bool
-  - name: best_move_saved_piece
-    dtype: string
-  - name: best_move_saved_piece_value
-    dtype: int64
-  - name: best_move_is_developing
-    dtype: bool
-  - name: best_move_improves_center
-    dtype: bool
-  - name: best_move_center_control_change
-    dtype: int64
-  - name: best_move_increases_king_pressure
-    dtype: bool
-  - name: best_move_king_attack_change
-    dtype: int64
-  - name: best_move_creates_passed_pawn
-    dtype: bool
-  - name: best_move_advances_passed_pawn
-    dtype: bool
-  - name: mobility_before
-    dtype: int64
-  - name: mobility_after_opponent
-    dtype: int64
-  - name: our_mobility_after
-    dtype: int64
-  - name: after_best_cp
-    dtype: int64
-  - name: after_best_mate
-    dtype: int64
-  - name: eval_change
-    dtype: int64
-  - name: pv_uci
-    dtype: string
-  - name: pv_san
-    dtype: string
-  - name: pv_length
-    dtype: int64
-  - name: candidates_json
-    dtype: string
-  - name: num_candidates
-    dtype: int64
-  - name: second_move_uci
-    dtype: string
-  - name: second_move_san
-    dtype: string
-  - name: second_move_cp
-    dtype: int64
-  - name: second_move_cp_loss
-    dtype: int64
-  - name: third_move_uci
-    dtype: string
-  - name: third_move_san
-    dtype: string
-  - name: third_move_cp
-    dtype: int64
-  - name: third_move_cp_loss
-    dtype: int64
-  - name: num_good_moves
-    dtype: int64
-  - name: num_ok_moves
-    dtype: int64
-  - name: num_mistake_moves
-    dtype: int64
-  - name: num_blunder_moves
-    dtype: int64
-  - name: gap_1_2
-    dtype: int64
-  - name: gap_1_3
-    dtype: int64
-  - name: gap_1_worst
-    dtype: int64
-  - name: is_clear_best
-    dtype: bool
-  - name: is_only_move
-    dtype: bool
-  - name: is_critical
-    dtype: bool
-  - name: is_tactical
-    dtype: bool
-  - name: is_forcing
-    dtype: bool
-  - name: is_quiet
-    dtype: bool
-  - name: is_winning
-    dtype: bool
-  - name: is_losing
-    dtype: bool
-  - name: is_equal
-    dtype: bool
-  - name: is_sharp
-    dtype: bool
-  - name: interesting_score
-    dtype: int64
-  - name: analysis_depth
-    dtype: int64
-  - name: analysis_multipv
-    dtype: int64
-  - name: white_elo
-    dtype: int64
-  - name: black_elo
-    dtype: int64
-  - name: avg_elo
-    dtype: int64
-  - name: elo_bucket
-    dtype: string
-  - name: time_control
-    dtype: string
-  - name: result
-    dtype: string
-  - name: puzzle_rating
-    dtype: int64
-  - name: puzzle_rating_deviation
-    dtype: int64
-  - name: puzzle_themes
-    list: string
-  - name: puzzle_solution_uci
-    dtype: string
-  - name: puzzle_popularity
-    dtype: int64
-  - name: puzzle_nb_plays
-    dtype: int64
-  - name: filter_reason
-    dtype: string
-  - name: in_100
-    dtype: bool
-  - name: in_500
-    dtype: bool
-  - name: in_1000
-    dtype: bool
-  - name: in_2000
-    dtype: bool
-  - name: in_5000
-    dtype: bool
-  - name: in_10000
-    dtype: bool
-  - name: in_20000
-    dtype: bool
-  - name: in_50000
-    dtype: bool
-  splits:
-  - name: train
-    num_bytes: 382924226
-    num_examples: 100000
-  download_size: 94131876
-  dataset_size: 382924226
-configs:
-- config_name: default
-  data_files:
-  - split: train
-    path: data/train-*
+license: mit
+task_categories:
+  - text-generation
+language:
+  - en
+tags:
+  - chess
+  - stockfish
+  - sft
+  - fine-tuning
+  - game-playing
+pretty_name: Chess SFT Training Dataset
+size_categories:
+  - 10K<n<100K
 ---
+
+# Chess SFT Training Dataset
+
+A curated dataset of chess positions with deep Stockfish analysis, designed for supervised fine-tuning (SFT) of language models to play and understand chess.
+
+## Dataset Description
+
+This dataset contains chess positions extracted from multiple high-quality sources, each analyzed with Stockfish at depth 20 with MultiPV 3 (top 3 candidate moves). The positions are carefully filtered for quality and diversity across game phases, player skill levels, and position types.
+
+### Sources
+
+| Source | Description | Proportion |
+|--------|-------------|------------|
+| **lichess-puzzles** | Tactical puzzles from Lichess with clear best moves | 30% |
+| **lichess-elite** | Elite games (2400+ vs 2300+ rated) from [nikonoel.fr](https://database.nikonoel.fr/) | 25% |
+| **lichess-tournament** | Competitive tournament games | 20% |
+| **lichess-standard** | Standard rated games across all ELO ranges | 25% |
+
+### Key Features
+
+- **Deep analysis**: Stockfish depth 20, MultiPV 3
+- **Rich annotations**: 100+ fields including evaluation, move quality, tactics, and positional factors
+- **Balanced phases**: ~10% opening, ~65% middlegame, ~25% endgame (for game sources)
+- **Quality filtered**: Positions selected for interesting decisions
+- **Diverse skill levels**: From novice (<1600) to expert (2400+) play
+
+---
+
+## Complete Schema
+
+### Identification & Source
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `id` | string | Unique identifier: `{source}_{game_id}_{ply}` |
+| `game_id` | string | Original game or puzzle ID |
+| `source` | string | Data source (lichess-puzzles, lichess-elite, lichess-tournament, lichess-standard) |
+| `source_type` | string | "puzzle" or "game" |
+
+### Position Representation
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `fen` | string | FEN notation of the position |
+| `board_utf8` | string | Unicode board visualization |
+| `board_ascii` | string | ASCII board visualization |
+| `side_to_move` | string | "white" or "black" |
+| `ply` | int | Half-move number in the game |
+| `fullmove_number` | int | Full move number |
+| `game_phase` | string | "opening", "middlegame", or "endgame" |
+
+### Legal Moves
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `legal_moves_uci` | string | Space-separated legal moves in UCI notation |
+| `legal_moves_san` | string | Space-separated legal moves in SAN notation |
+| `num_legal_moves` | int | Count of legal moves |
+
+### Current Position Evaluation
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `current_cp` | int | Centipawn evaluation (+ favors side to move) |
+| `current_mate` | int/null | Mate distance if forced mate exists |
+| `current_eval_desc` | string | Human-readable eval ("White is winning +3.5") |
+| `current_eval_category` | string | "winning", "slightly_better", "equal", "slightly_worse", "losing" |
+
+### Best Move Analysis
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `best_move_uci` | string | Best move in UCI notation |
+| `best_move_san` | string | Best move in SAN notation |
+| `best_move_cp` | int | Evaluation after best move |
+| `best_move_mate` | int/null | Mate distance after best move |
+| `best_move_is_capture` | bool | Move captures a piece |
+| `best_move_captured_piece` | string/null | Name of captured piece |
+| `best_move_captured_value` | int | Material value of capture |
+| `best_move_is_check` | bool | Move gives check |
+| `best_move_is_checkmate` | bool | Move is checkmate |
+| `best_move_is_castling` | bool | Move is castling |
+| `best_move_is_promotion` | bool | Move is pawn promotion |
+| `best_move_promotion_piece` | string/null | Promotion piece type |
+| `best_move_piece_moved` | string | Type of piece moved |
+| `best_move_from` | string | Origin square (e.g., "e2") |
+| `best_move_to` | string | Destination square (e.g., "e4") |
+
+### Move Purpose Analysis (Why the move is good)
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `best_move_category` | string | Primary purpose: "tactic", "attack", "defense", "positional", "developing", "escape" |
+| `best_move_is_sacrifice` | bool | Move sacrifices material |
+| `best_move_sacrifice_type` | string/null | "queen_sac", "rook_sac", "piece_sac", "exchange_sac", "pawn_sac" |
+| `best_move_material_sacrificed` | int | Material value sacrificed |
+
+### Threats Created
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `best_move_creates_threats` | bool | Move creates new threats |
+| `best_move_num_new_attacks` | int | Number of new piece attacks |
+| `best_move_total_threat_value` | int | Total value of threatened pieces |
+| `best_move_attacks_queen` | bool | Threatens enemy queen |
+| `best_move_attacks_rook` | bool | Threatens enemy rook |
+| `best_move_attacks_minor` | bool | Threatens knight or bishop |
+| `best_move_new_attacks_json` | string/null | JSON array of attack details |
+| `best_move_creates_fork` | bool | Creates a fork |
+| `best_move_creates_pin` | bool | Creates a pin |
+| `best_move_pinned_piece` | string/null | Pinned piece type |
+| `best_move_creates_skewer` | bool | Creates a skewer |
+| `best_move_is_discovered_attack` | bool | Is a discovered attack |
+
+### Defensive Aspects
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `position_had_hanging_piece` | bool | Position had undefended piece |
+| `position_hanging_piece_value` | int | Value of hanging piece |
+| `best_move_saves_hanging` | bool | Move saves the hanging piece |
+| `best_move_saved_piece` | string/null | Type of saved piece |
+| `best_move_saved_piece_value` | int | Value of saved piece |
+
+### Positional Improvements
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `best_move_is_developing` | bool | Develops a piece |
+| `best_move_improves_center` | bool | Improves center control |
+| `best_move_center_control_change` | int | Change in center control |
+| `best_move_increases_king_pressure` | bool | Increases attack on enemy king |
+| `best_move_king_attack_change` | int | Change in king zone attacks |
+| `best_move_creates_passed_pawn` | bool | Creates a passed pawn |
+| `best_move_advances_passed_pawn` | bool | Advances existing passed pawn |
+
+### Mobility
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `mobility_before` | int | Our legal moves before |
+| `mobility_after_opponent` | int | Opponent's moves after our move |
+| `our_mobility_after` | int | Our moves after opponent replies |
+
+### Evaluation After Best Move
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `after_best_cp` | int | Eval after best move (from opponent's view) |
+| `after_best_mate` | int/null | Mate distance after best move |
+| `eval_change` | int | Change in evaluation |
+
+### Principal Variation
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `pv_uci` | string | Best line in UCI (up to 10 moves) |
+| `pv_san` | string | Best line in SAN |
+| `pv_length` | int | Length of principal variation |
+
+### Alternative Moves (2nd and 3rd Best)
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `second_move_uci` | string/null | 2nd best move UCI |
+| `second_move_san` | string/null | 2nd best move SAN |
+| `second_move_cp` | int/null | 2nd best move evaluation |
+| `second_move_cp_loss` | int/null | Centipawn loss vs best |
+| `third_move_uci` | string/null | 3rd best move UCI |
+| `third_move_san` | string/null | 3rd best move SAN |
+| `third_move_cp` | int/null | 3rd best move evaluation |
+| `third_move_cp_loss` | int/null | Centipawn loss vs best |
+
+### All Candidates (JSON)
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `candidates_json` | string | Full JSON array of all analyzed moves with complete data |
+| `num_candidates` | int | Number of candidates analyzed (typically 3) |
+
+### Move Quality Distribution
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `num_good_moves` | int | Moves within 30cp of best |
+| `num_ok_moves` | int | Moves 30-100cp worse |
+| `num_mistake_moves` | int | Moves 100-200cp worse |
+| `num_blunder_moves` | int | Moves 200+cp worse |
+
+### Evaluation Gaps
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `gap_1_2` | int | Centipawn gap: best vs 2nd best |
+| `gap_1_3` | int | Centipawn gap: best vs 3rd best |
+| `gap_1_worst` | int | Centipawn gap: best vs worst candidate |
+
+### Position Type Flags
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `is_clear_best` | bool | Best move is clearly superior (gap > 50cp) |
+| `is_only_move` | bool | Only one reasonable move (gap > 150cp) |
+| `is_critical` | bool | Large eval swing based on move choice |
+| `is_tactical` | bool | Position involves tactics |
+| `is_forcing` | bool | Few good options, forcing sequence |
+| `is_quiet` | bool | Calm positional position |
+| `is_winning` | bool | Side to move is winning |
+| `is_losing` | bool | Side to move is losing |
+| `is_equal` | bool | Position is roughly equal |
+| `is_sharp` | bool | High tension, big eval swings possible |
+
+### Quality Score
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `interesting_score` | int | Composite score for position quality (higher = more interesting) |
+| `filter_reason` | string | Why position was kept: "puzzle", "critical", "very_interesting", "interesting", "standard", "boring" |
+
+### Material Count
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `material_white` | int | White's material value |
+| `material_black` | int | Black's material value |
+| `material_diff` | int | Material difference (+ favors white) |
+| `material_total` | int | Total material on board |
+| `white_pawns` | int | White pawn count |
+| `white_knights` | int | White knight count |
+| `white_bishops` | int | White bishop count |
+| `white_rooks` | int | White rook count |
+| `white_queens` | int | White queen count |
+| `black_pawns` | int | Black pawn count |
+| `black_knights` | int | Black knight count |
+| `black_bishops` | int | Black bishop count |
+| `black_rooks` | int | Black rook count |
+| `black_queens` | int | Black queen count |
+| `has_bishop_pair_white` | bool | White has bishop pair |
+| `has_bishop_pair_black` | bool | Black has bishop pair |
+| `is_queenless` | bool | Neither side has a queen |
+
+### King Safety
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `white_king_castled_short` | bool | White castled kingside |
+| `white_king_castled_long` | bool | White castled queenside |
+| `white_king_in_center` | bool | White king still in center |
+| `white_king_zone_attacks` | int | Attacks on white king zone |
+| `black_king_castled_short` | bool | Black castled kingside |
+| `black_king_castled_long` | bool | Black castled queenside |
+| `black_king_in_center` | bool | Black king still in center |
+| `black_king_zone_attacks` | int | Attacks on black king zone |
+
+### Checks and Threats
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `is_check` | bool | Side to move is in check |
+| `num_checkers` | int | Number of checking pieces |
+| `num_checking_moves` | int | Legal moves that give check |
+| `num_capture_moves` | int | Legal capturing moves |
+| `max_capture_value` | int | Highest value capture available |
+
+### Pawn Structure
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `white_doubled_pawns` | int | White's doubled pawns |
+| `black_doubled_pawns` | int | Black's doubled pawns |
+| `white_passed_pawns` | int | White's passed pawns |
+| `black_passed_pawns` | int | Black's passed pawns |
+
+### Center Control
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `white_center_control` | int | White's attacks on d4,d5,e4,e5 |
+| `black_center_control` | int | Black's attacks on d4,d5,e4,e5 |
+
+### Board State Flags
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `is_stalemate` | bool | Position is stalemate |
+| `is_insufficient_material` | bool | Draw by insufficient material |
+| `can_claim_draw` | bool | Draw can be claimed |
+| `halfmove_clock` | int | Moves since pawn move/capture |
+| `is_fifty_move_possible` | bool | 50-move rule applicable |
+| `board_tension` | int | Sum of attacked piece values |
+
+### Player Ratings
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `white_elo` | int | White player's rating |
+| `black_elo` | int | Black player's rating |
+| `avg_elo` | int | Average rating |
+| `elo_bucket` | string | "novice" (<1600), "club" (1600-2000), "strong" (2000-2400), "expert" (2400+) |
+
+### Game Metadata
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `time_control` | string | Time control of the game |
+| `result` | string | Game result (1-0, 0-1, 1/2-1/2) |
+
+### Analysis Metadata
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `analysis_depth` | int | Stockfish search depth used |
+| `analysis_multipv` | int | Number of lines analyzed |
+
+### Puzzle-Specific Fields (only for lichess-puzzles)
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `puzzle_rating` | int | Puzzle difficulty rating |
+| `puzzle_rating_deviation` | int | Rating uncertainty |
+| `puzzle_themes` | string | Space-separated puzzle themes |
+| `puzzle_solution_uci` | string | Puzzle solution moves in UCI |
+| `puzzle_popularity` | int | Puzzle popularity score |
+| `puzzle_nb_plays` | int | Number of times puzzle was played |
+
+### Subset Flags
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `in_100` | bool | Included in 100-sample subset |
+| `in_500` | bool | Included in 500-sample subset |
+| `in_1000` | bool | Included in 1000-sample subset |
+| `in_2000` | bool | Included in 2000-sample subset |
+| ... | ... | Additional subset flags as available |
+
+---
+
+## Position Quality Distribution
+
+Positions are categorized by why they were kept:
+
+- **puzzle**: From the puzzles dataset (tactical training)
+- **critical**: Large evaluation swing based on move choice
+- **very_interesting**: High composite interest score (score >= 30)
+- **interesting**: Good interest score (score >= 15)
+- **standard**: Baseline interesting positions (score >= 0)
+- **boring**: Lower interest but included for diversity
+
+## Intended Uses
+
+- **SFT for chess LLMs**: Train language models to suggest good chess moves
+- **Move quality prediction**: Predict evaluation changes from moves
+- **Position understanding**: Train models to describe chess positions
+- **Chess tutoring**: Generate explanations for why moves are good/bad
+- **Move purpose classification**: Classify moves as tactical/positional/defensive
+
+## Example Usage
+
+```python
+from datasets import load_dataset
+
+dataset = load_dataset("agi-noobs/chess-sft-20k")
+
+# Get a position
+pos = dataset["train"][0]
+
+# Basic info
+print(f"FEN: {pos['fen']}")
+print(f"Best move: {pos['best_move_san']}")
+print(f"Evaluation: {pos['current_cp']} cp")
+
+# Move characteristics
+print(f"Is tactical: {pos['is_tactical']}")
+print(f"Is sacrifice: {pos['best_move_is_sacrifice']}")
+print(f"Creates fork: {pos['best_move_creates_fork']}")
+
+# Position insights
+print(f"Material diff: {pos['material_diff']}")
+print(f"Board tension: {pos['board_tension']}")
+
+# Alternative moves
+print(f"2nd best: {pos['second_move_san']} ({pos['second_move_cp_loss']}cp worse)")
+```
+
+## Generation Details
+
+- **Stockfish version**: Latest (via Homebrew)
+- **Analysis depth**: 20 ply
+- **MultiPV**: 3 (top 3 moves analyzed)
+- **Hash**: 128 MB per instance
+- **Workers**: 8 parallel Stockfish instances
+
+## Limitations
+
+- Evaluations are Stockfish's assessment, not ground truth
+- Some positions may have multiple equally good moves not captured by MultiPV 3
+- Puzzle positions are pre-solution (the position before the winning tactic)
+- ELO ratings are from Lichess, which may differ from FIDE ratings
+
+## License
+
+MIT License
+
+## Citation
+
+```bibtex
+@dataset{chess_sft_2024,
+  title={Chess SFT Training Dataset},
+  author={AGI Noobs},
+  year={2024},
+  publisher={Hugging Face},
+  url={https://huggingface.co/datasets/agi-noobs/chess-sft-20k}
+}
+```
+
+## Acknowledgments
+
+- [Lichess](https://lichess.org/) for the open game and puzzle databases
+- [nikonoel.fr](https://database.nikonoel.fr/) for the curated elite games database
+- [Stockfish](https://stockfishchess.org/) for the chess engine