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Chess RL positions (exp183 A40 soft+SF)

Cumulative expert-iteration dataset from model MCTS vs full-strength Stockfish depth 8.

Contents

  • 13,372 positions across 9 shards
  • 6,109 soft MCTS (source=mcts: visit_dist + root_q)
  • 7,263 hard SF moves (source=sf: chosen_move + SF score as root_q)

Layout

manifest.json
shards/shard_XXXXXX.pt
shards/shard_XXXXXX.json

Each .pt is {"positions": [...], "meta": {...}}.

Position schema

{
  "fen": "...",
  "source": "mcts" | "sf",
  "visit_dist": {move_idx: prob, ...},  # soft for mcts; one-hot for sf
  "root_q": float,                      # STM in [-1, 1]
  "chosen_move": int,
  "game_id": int,
}

Generated by experiments/exp183_selfplay.py in https://github.com/avewright/transform

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