---
license: mit
tags:
- chess
- stockfish-19
- soft-labels
- multipv
- endgame
pretty_name: Endgame Stockfish 19 soft targets
---

# 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`