Datasetpublic

avewright/endgame-dataset

avewright/endgame-dataset 6–13 piece positions with official Stockfish 19 MultiPV soft targets. SF vs SF games start from Lichess ECO, fast-forward (capture-biased) until the piece window, then label. 300,017 rows. Source id 4. Vocab compact (1968). Filter Keep only boards with 6 ≤ n_pieces ≤ 13 Stop the game below 6 pieces (Syzygy territory) split=1 is a ~5% holdout. Honor split. ECO starts: 7,852. Teacher Stockfish 19 tag sf_19 (``) Full… See the full description on the dataset page: https://huggingface.co/datasets/avewright/endgame-dataset.

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Dataset Card

avewright/endgame-dataset

6–13 piece positions with official Stockfish 19 MultiPV soft targets. SF vs SF games start from Lichess ECO, fast-forward (capture-biased) until the piece window, then label.

300,017 rows. Source id 4. Vocab compact (1968).

Filter

—Keep only boards with 6 ≤ n_pieces ≤ 13
—Stop the game below 6 pieces (Syzygy territory)
—split=1 is a ~5% holdout. Honor split.

ECO starts: 7,852.

Teacher

—Stockfish 19 tag sf_19 (``)
—Full strength, Threads=1, Hash=64, UCI_ShowWDL=true
—Label: 100,000 nodes / MultiPV=8 / tau=120
—Fast-forward play: captures first, else ≤800-node search
—cp / mate / wdl: White-absolute
—soft_indices / soft_probs: width 8

Accepted so far: 299,982.

Files

—data/shard_XXXXXX.parquet
—teacher.json, endgame.json, openings.json, manifest.json, stats.json