fen string | position_fen string | position_key string | best_move string | best_cp int64 | soft_targets list | label_depth int64 | label_multipv int64 | label_tau float64 | label_mode string | num_legal int64 | phase string | ply int64 | source string | created_at string | value_target int64 | cp_gap_top1_top2 int64 | teacher_entropy float64 | hf_repo string |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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"c4c... | 4 | 8 | 120 | multipv_topk | 32 | opening | 17 | exp186_sf_multipv | 2026-07-09T20:54:32.685964+00:00 | 2 | 456 | 0.266071 | avewright/chess-positions-sf-labeled |
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},... | 3 | 8 | 120 | multipv_topk | 26 | middlegame | 23 | exp186_sf_multipv | 2026-07-09T20:54:32.733115+00:00 | 0 | 82 | 1.966783 | avewright/chess-positions-sf-labeled |
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"uci": "d8h4",
"prob": 0.46222296357154846,
"cp": 89,
"eval_type": "cp",
"rank": 2,
"pv": [
"d8h4"... | 4 | 8 | 120 | multipv_topk | 33 | opening | 15 | exp186_sf_multipv | 2026-07-09T20:54:34.171687+00:00 | 2 | 13 | 0.823165 | avewright/chess-positions-sf-labeled |
rnbqkbnr/p1pppp1p/1p6/6p1/P7/5N2/1PPPPPPP/RNBQKB1R w KQkq - 0 3 | rnbqkbnr/p1pppp1p/1p6/6p1/P7/5N2/1PPPPPPP/RNBQKB1R w | 1dbcbdcf79d3007e | f3g5 | 159 | [
{
"uci": "f3g5",
"prob": 0.19660165905952454,
"cp": 159,
"eval_type": "cp",
"rank": 1,
"pv": [
"f3g5",
"h7h6",
"g5f3",
"e7e6",
"a4a5"
]
},
{
"uci": "e2e4",
"prob": 0.14443740248680115,
"cp": 122,
"eval_type": "cp",
"rank": 2,
"pv"... | 8 | 8 | 120 | multipv_topk | 23 | opening | 6 | exp186_sf_multipv | 2026-07-09T20:54:34.209512+00:00 | 2 | 37 | 2.042395 | avewright/chess-positions-sf-labeled |
2k5/8/1P6/8/8/3R4/5P2/6K1 b - - 16 33 | 2k5/8/1P6/8/8/3R4/5P2/6K1 b | 95fda080bf064954 | c8b7 | -597 | [
{
"uci": "c8b7",
"prob": 0.562176525592804,
"cp": -597,
"eval_type": "cp",
"rank": 1,
"pv": [
"c8b7",
"d3d1",
"b7b8",
"f2f3",
"b8b7",
"d1b1"
]
},
{
"uci": "c8b8",
"prob": 0.4378235340118408,
"cp": -627,
"eval_type": "cp",
"rank"... | 7 | 2 | 120 | multipv_topk | 2 | endgame | 65 | exp186_sf_multipv | 2026-07-09T20:54:34.212710+00:00 | 0 | 30 | 0.685395 | avewright/chess-positions-sf-labeled |
2bk1b1r/1p1p4/6rp/3P2pn/p6P/PP3N2/4PPP1/2BRKB1R w K - 1 16 | 2bk1b1r/1p1p4/6rp/3P2pn/p6P/PP3N2/4PPP1/2BRKB1R w | d273e969e5cd510a | h4g5 | 467 | [
{
"uci": "h4g5",
"prob": 0.22849178314208984,
"cp": 467,
"eval_type": "cp",
"rank": 1,
"pv": [
"h4g5",
"h6g5",
"c1g5",
"g6g5",
"f3g5",
"f8a3"
]
},
{
"uci": "f3e5",
"prob": 0.16647309064865112,
"cp": 429,
"eval_type": "cp",
"rank... | 6 | 8 | 120 | multipv_topk | 26 | opening | 32 | exp186_sf_multipv | 2026-07-09T20:54:34.225182+00:00 | 2 | 38 | 1.990761 | avewright/chess-positions-sf-labeled |
8/8/1nB5/8/4K3/8/5k2/8 b - - 2 52 | 8/8/1nB5/8/4K3/8/5k2/8 b | 2ed0f8083329d98c | b6d7 | 0 | [
{
"uci": "b6d7",
"prob": 0.12565171718597412,
"cp": 0,
"eval_type": "cp",
"rank": 1,
"pv": [
"b6d7",
"c6a8"
]
},
{
"uci": "b6a8",
"prob": 0.12565171718597412,
"cp": 0,
"eval_type": "cp",
"rank": 2,
"pv": [
"b6a8",
"e4d3",
"f2e1",
... | 6 | 8 | 120 | multipv_topk | 12 | endgame | 103 | exp186_sf_multipv | 2026-07-09T20:54:34.226068+00:00 | 1 | 0 | 2.079433 | avewright/chess-positions-sf-labeled |
rnbqkbnr/p2ppppp/8/2p3NQ/2p5/4P3/PP1P1PPP/RNB1KB1R w KQkq - 0 6 | rnbqkbnr/p2ppppp/8/2p3NQ/2p5/4P3/PP1P1PPP/RNB1KB1R w | 091323402632b5d7 | h5f7 | 99,999 | [
{
"uci": "h5f7",
"prob": 1,
"cp": 99999,
"eval_type": "mate",
"rank": 1,
"pv": [
"h5f7"
]
},
{
"uci": "f1c4",
"prob": 0,
"cp": 846,
"eval_type": "cp",
"rank": 2,
"pv": [
"f1c4",
"d7d6",
"c4b5",
"d8d7",
"h5f7",
"e8d8",
... | 6 | 8 | 120 | multipv_topk | 37 | opening | 12 | exp186_sf_multipv | 2026-07-09T20:54:34.256157+00:00 | 2 | 99,153 | -0 | avewright/chess-positions-sf-labeled |
End of preview. Expand in Data Studio
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
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