| 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 | |