---
license: mit
task_categories:
- other
tags:
- chess
- syzygy
- tablebase
- soft-labels
- endgame
---

# Syzygy soft MultiPV endgame dataset

Perfect ≤5-piece endgame positions labeled via Syzygy WDL (soft top-8 moves).
Compatible with ChessTransformer soft-cache training (compact move vocab).

## Columns
- `board_array` (64 int8), `turn`, `castling`, `ep_square`
- `move_idx`, `cp`, `mate` — hard best + eval
- `soft_indices[8]`, `soft_probs[8]` — TB soft policy
- `n_pieces` — pieces on board (3–5)
- `ply` — estimated ply
- `wdl` — position WDL from STM (−2…2)
- `dtz` — distance-to-zero (signed)
- `phase` = 2 (endgame), `source` = 2 (syzygy), `label_depth` = 999