Dev Builds » 20260801-0448

Use this dev build

NCM plays each Stockfish dev build 20,000 times against Stockfish 15. This yields an approximate Elo difference and establishes confidence in the strength of the dev builds.

Summary

Host Duration Avg Base NPS Games WLD Standard Elo Ptnml(0-2) Gamepair Elo
ncm-dbt-01 06:44:35 583745 4014 1811 277 1926 +139.87 ± 4.4 0 18 484 1458 47 +330.93 ± 15.47
ncm-dbt-02 06:44:55 591929 3992 1747 278 1967 +134.14 ± 4.33 0 18 520 1429 29 +316.39 ± 14.9
ncm-dbt-03 06:45:34 578076 4000 1782 289 1929 +136.26 ± 4.37 0 15 517 1428 40 +320.08 ± 14.93
ncm-dbt-04 06:45:20 567161 4012 1797 312 1903 +135.01 ± 4.39 0 26 499 1451 30 +319.22 ± 15.25
ncm-dbt-05 06:44:10 603562 3982 1801 318 1863 +135.93 ± 4.43 0 20 508 1423 40 +318.81 ± 15.09
20000 8938 1474 9588 +136.24 ± 1.96 0 97 2528 7189 186 +321.04 ± 6.75

Test Detail

ID Host Base NPS Games WLD Standard Elo Ptnml(0-2) Gamepair Elo CLI PGN
481575 ncm-dbt-04 566533 12 6 1 5 +154.02 ± 64.21 0 0 1 5 0 +416.21 ± 496.36
481574 ncm-dbt-01 583698 14 7 3 4 +102.04 ± 70.73 0 0 3 4 0 +225.59 ± 263.0
481573 ncm-dbt-05 601357 482 214 53 215 +120.68 ± 13.07 0 3 78 156 4 +270.24 ± 38.61
481572 ncm-dbt-02 589924 492 213 32 247 +134.1 ± 11.75 0 2 62 181 1 +323.95 ± 43.68
481571 ncm-dbt-03 576333 500 207 28 265 +130.14 ± 12.19 0 1 73 172 4 +301.33 ± 39.86
481570 ncm-dbt-04 568554 500 223 43 234 +130.94 ± 13.51 0 6 64 174 6 +298.62 ± 43.1
481569 ncm-dbt-01 583992 500 226 39 235 +136.56 ± 12.18 0 3 60 184 3 +327.18 ± 44.54
481568 ncm-dbt-05 601891 500 231 34 235 +144.71 ± 12.26 0 1 58 184 7 +346.12 ± 45.18
481567 ncm-dbt-02 591254 500 209 34 257 +126.97 ± 13.22 0 4 73 167 6 +285.49 ± 40.16
481566 ncm-dbt-03 574013 500 220 45 235 +126.97 ± 13.22 0 5 70 170 5 +288.06 ± 41.11
481565 ncm-dbt-04 567918 500 219 36 245 +133.34 ± 12.89 0 5 61 180 4 +312.48 ± 44.19
481564 ncm-dbt-01 583614 500 220 33 247 +136.56 ± 12.18 0 1 66 178 5 +321.19 ± 42.12
481563 ncm-dbt-05 611397 500 223 35 242 +137.37 ± 12.15 0 3 59 185 3 +330.23 ± 44.94
481562 ncm-dbt-02 592159 500 229 45 226 +134.15 ± 11.64 0 2 63 184 1 +324.17 ± 43.32
481561 ncm-dbt-03 580530 500 223 32 245 +139.81 ± 12.47 0 3 58 184 5 +333.32 ± 45.35
481560 ncm-dbt-04 567522 500 234 42 224 +140.62 ± 12.23 0 2 59 184 5 +336.46 ± 44.87
481559 ncm-dbt-01 583237 500 227 35 238 +140.62 ± 13.04 0 4 57 182 7 +330.23 ± 45.79
481558 ncm-dbt-05 604757 500 229 39 232 +138.99 ± 12.09 0 3 57 187 3 +336.46 ± 45.77
481557 ncm-dbt-02 590911 500 222 34 244 +137.37 ± 12.96 0 4 60 180 6 +321.19 ± 44.57
481556 ncm-dbt-03 578424 500 231 36 233 +143.07 ± 12.12 0 0 62 181 7 +339.63 ± 43.41
481555 ncm-dbt-04 568673 500 231 33 236 +145.54 ± 11.79 0 1 55 189 5 +356.21 ± 46.49
481554 ncm-dbt-01 582527 500 231 31 238 +147.19 ± 12.78 0 1 58 181 10 +346.12 ± 45.18
481553 ncm-dbt-05 601001 500 220 39 241 +131.74 ± 12.93 0 4 66 175 5 +304.07 ± 42.38
481552 ncm-dbt-02 592461 500 220 38 242 +132.54 ± 12.12 0 1 70 175 4 +309.64 ± 40.79
481551 ncm-dbt-04 566217 500 217 50 233 +120.67 ± 12.41 0 4 76 169 1 +277.93 ± 39.29
481550 ncm-dbt-03 580530 500 218 34 248 +134.15 ± 11.86 0 1 67 179 3 +318.25 ± 41.77
481549 ncm-dbt-01 583572 500 212 30 258 +132.54 ± 12.71 0 3 67 175 5 +306.84 ± 41.99
481548 ncm-dbt-05 598921 500 229 37 234 +140.62 ± 11.59 0 0 62 184 4 +339.63 ± 43.41
481547 ncm-dbt-02 592374 500 220 32 248 +137.37 ± 12.15 0 2 62 182 4 +327.18 ± 43.69
481546 ncm-dbt-01 584243 500 228 39 233 +138.18 ± 12.73 0 2 64 177 7 +321.19 ± 42.95
481545 ncm-dbt-04 564880 500 225 33 242 +140.62 ± 12.23 0 3 56 187 4 +339.63 ± 46.2
481544 ncm-dbt-03 579083 500 229 33 238 +143.89 ± 12.3 0 1 59 183 7 +342.85 ± 44.76
481543 ncm-dbt-05 602070 500 233 40 227 +141.44 ± 13.4 0 4 58 179 9 +327.18 ± 45.37
481542 ncm-dbt-02 591642 500 224 36 240 +137.37 ± 11.29 0 1 61 187 1 +336.46 ± 43.96
481541 ncm-dbt-01 583196 500 231 27 242 +150.51 ± 10.79 0 0 49 198 3 +385.59 ± 49.31
481540 ncm-dbt-03 576741 500 230 44 226 +135.76 ± 12.42 0 2 65 178 5 +318.25 ± 42.59
481539 ncm-dbt-04 564448 500 219 38 243 +131.74 ± 12.54 0 4 64 179 3 +309.64 ± 43.08
481538 ncm-dbt-05 607105 500 222 41 237 +131.74 ± 12.54 0 2 70 173 5 +304.07 ± 40.91
481537 ncm-dbt-02 594714 500 210 27 263 +133.34 ± 12.69 0 2 69 173 6 +306.84 ± 41.23
481536 ncm-dbt-01 585632 500 229 40 231 +138.18 ± 13.12 0 4 60 179 7 +321.19 ± 44.57
481535 ncm-dbt-03 578959 500 224 37 239 +136.56 ± 12.18 0 2 63 181 4 +324.17 ± 43.32
481534 ncm-dbt-04 569709 500 223 36 241 +136.56 ± 11.55 0 1 63 184 2 +330.23 ± 43.2

Commit

Commit ID 7b5504097feb349a2262eec0702b2a18e426ccf6
Author Bartosz Paprzycki
Date 2026-08-01 04:48:07 UTC
Update NNUE perspectives together When both perspective accumulators can be updated incrementally, catch up the lagging perspective and traverse their common suffix once. During each shared transition: - decode FullThreats changes once while preserving perspective-specific indices; - enumerate non-AVX512 PP_3Wide topology once for both perspectives; - keep HalfKA indices and accumulator arithmetic perspective-specific; - retain the existing specialized AVX512 PP_3Wide generator. This preserves feature indices, list ordering, accumulator arithmetic, and the resulting evaluation. Passed STC: https://tests.stockfishchess.org/tests/view/6a63233fc054e285ae028702 LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 69632 W: 18217 L: 17881 D: 33534 Ptnml(0-2): 153, 7022, 20132, 7354, 155 closes https://github.com/official-stockfish/Stockfish/pull/7006 No functional change
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