metadata
license: mit
task_categories:
- other
tags:
- chess
- stockfish
- multipv
- soft-targets
- policy-distillation
size_categories:
- 1M<n<10M
exp186 Stockfish MultiPV soft targets (~2M)
Local Stockfish 18 full-strength MultiPV harvest for chess transformer soft-policy training.
Contents
data/positions_*.jsonl— ~2,000,000 positions (400 shards)soft_cache.pt— training-ready tensor cache (compact move vocab 1968)
Labeling
- Engine: Stockfish 18 (full strength, no UCI_LimitStrength)
- MultiPV: 8
- Depths: sampled in [2, 8] (weighted toward mid depths)
- Soft probs:
softmax(cp / τ)with τ=120
Schema
Each JSONL line has fen, best_move, best_cp, soft_targets (up to 8 moves with uci/prob/cp), label_depth, phase, source.
Stats
- written: 1998784
- depth_hist:
{"2": 209465, "3": 315864, "4": 421147, "5": 314654, "6": 210726, "7": 104881, "8": 105176} - uploaded_at: 2026-07-10T01:59:56.219054+00:00