Dev Builds » 20260710-1816

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 07:00:13 571830 4086 1779 353 1954 +126.57 ± 4.47 0 34 577 1404 28 +290.85 ± 14.17
ncm-dbt-02 07:01:14 571843 4074 1810 353 1911 +130.0 ± 4.45 0 28 558 1417 34 +300.36 ± 14.4
ncm-dbt-03 07:02:26 566852 4100 1823 367 1910 +129.0 ± 4.57 1 35 561 1413 40 +295.42 ± 14.38
ncm-dbt-04 07:01:44 555825 4102 1829 356 1917 +130.58 ± 4.38 0 29 547 1448 27 +304.78 ± 14.55
ncm-dbt-05 06:19:11 567157 3638 1637 279 1722 +136.27 ± 4.72 0 20 464 1292 43 +317.47 ± 15.8
20000 8878 1708 9414 +130.35 ± 2.02 1 146 2707 6974 172 +301.26 ± 6.53

Test Detail

ID Host Base NPS Games WLD Standard Elo Ptnml(0-2) Gamepair Elo CLI PGN
478415 ncm-dbt-01 584916 12 6 1 5 +154.02 ± 64.21 0 0 1 5 0 +416.21 ± 496.36
478414 ncm-dbt-04 567442 14 7 1 6 +159.07 ± 56.3 0 0 1 6 0 +445.23 ± 480.27
478413 ncm-dbt-03 577520 16 8 2 6 +136.9 ± 123.21 0 1 1 5 1 +254.73 ± 574.95
478412 ncm-dbt-02 590267 16 6 0 10 +136.89 ± 61.78 0 0 2 6 0 +337.87 ± 515.83
478411 ncm-dbt-05 527289 182 80 20 82 +118.98 ± 20.79 0 1 30 59 1 +268.38 ± 63.11
478391 ncm-dbt-01 526879 500 209 54 237 +111.37 ± 13.89 0 9 81 156 4 +243.0 ± 38.14
478390 ncm-dbt-03 527837 500 216 58 226 +113.68 ± 15.15 0 12 77 152 9 +238.66 ± 39.1
478389 ncm-dbt-02 529867 500 204 65 231 +99.2 ± 13.99 0 9 98 138 5 +207.95 ± 34.43
478388 ncm-dbt-04 509510 500 211 44 245 +120.67 ± 14.01 0 8 73 163 6 +265.78 ± 40.25
478387 ncm-dbt-05 530766 60 23 5 32 +107.53 ± 38.04 0 1 10 19 0 +240.82 ± 115.99
478383 ncm-dbt-01 525789 132 55 12 65 +117.45 ± 26.51 0 1 23 40 2 +252.58 ± 72.56
478380 ncm-dbt-02 502550 150 59 21 70 +89.97 ± 26.97 0 5 28 41 1 +187.77 ± 65.67
478378 ncm-dbt-03 506305 150 61 24 65 +87.5 ± 25.98 0 4 31 39 1 +181.7 ± 62.09
478377 ncm-dbt-04 508236 156 71 9 76 +146.12 ± 18.52 0 0 16 62 0 +376.78 ± 90.04
478376 ncm-dbt-02 535133 10 5 1 4 +147.05 ± 74.68 0 0 1 4 0 +381.35 ± 516.06
478375 ncm-dbt-03 530697 14 6 1 7 +129.72 ± 68.06 0 0 2 5 0 +311.09 ± 530.6
478374 ncm-dbt-05 521907 8 2 1 5 +43.64 ± 153.21 0 1 1 2 0 +88.74 ± 710.5
478373 ncm-dbt-05 579578 388 177 33 178 +135.41 ± 15.12 0 2 53 132 7 +305.58 ± 47.3
478372 ncm-dbt-02 588558 398 176 33 189 +130.66 ± 13.94 0 2 55 139 3 +303.74 ± 46.38
478371 ncm-dbt-04 566060 432 199 42 191 +132.31 ± 14.18 0 5 53 154 4 +307.07 ± 47.49
478370 ncm-dbt-01 581236 442 190 40 212 +122.77 ± 14.39 0 5 66 145 5 +273.07 ± 42.34
478369 ncm-dbt-03 585337 420 191 33 196 +137.45 ± 14.03 0 1 57 145 7 +314.66 ± 45.4
478368 ncm-dbt-05 580240 500 225 37 238 +137.37 ± 13.34 0 3 65 173 9 +312.48 ± 42.67
478367 ncm-dbt-04 569709 500 219 36 245 +133.34 ± 11.46 0 2 63 185 0 +324.17 ± 43.32
478366 ncm-dbt-02 590953 500 223 42 235 +131.74 ± 12.34 0 1 72 172 5 +304.07 ± 40.16
478365 ncm-dbt-01 584117 500 222 37 241 +134.95 ± 11.61 0 2 62 185 1 +327.18 ± 43.69
478364 ncm-dbt-03 582903 500 227 37 236 +138.99 ± 12.7 0 4 57 184 5 +330.23 ± 45.79
478363 ncm-dbt-05 585042 500 223 44 233 +130.14 ± 13.16 0 5 66 174 5 +298.62 ± 42.41
478362 ncm-dbt-04 566296 500 228 47 225 +131.74 ± 11.52 0 0 71 177 2 +312.47 ± 40.3
478361 ncm-dbt-02 590481 500 227 40 233 +136.56 ± 12.18 0 3 60 184 3 +327.18 ± 44.54
478360 ncm-dbt-01 583321 500 203 35 262 +121.45 ± 12.77 0 4 77 166 3 +275.45 ± 39.01
478359 ncm-dbt-03 583489 500 223 39 238 +134.15 ± 11.64 0 1 66 181 2 +321.19 ± 42.12
478358 ncm-dbt-05 586943 500 220 36 244 +134.15 ± 12.06 0 3 62 183 2 +321.19 ± 43.77
478357 ncm-dbt-04 567997 500 220 49 231 +123.81 ± 13.28 0 5 74 166 5 +277.93 ± 39.92
478356 ncm-dbt-02 592461 500 234 35 231 +146.36 ± 12.4 0 1 57 184 8 +349.43 ± 45.6
478355 ncm-dbt-01 581818 500 230 37 233 +141.44 ± 11.98 0 2 57 187 4 +342.85 ± 45.71
478354 ncm-dbt-03 583740 500 225 44 231 +131.74 ± 13.12 0 3 70 170 7 +298.62 ± 41.01
478353 ncm-dbt-05 581277 500 233 34 233 +146.36 ± 11.96 0 2 52 191 5 +359.68 ± 48.01
478352 ncm-dbt-02 590696 500 223 38 239 +134.95 ± 12.24 0 2 65 179 4 +318.25 ± 42.59
478351 ncm-dbt-04 567997 500 223 45 232 +129.35 ± 13.36 0 5 68 171 6 +293.29 ± 41.75
478350 ncm-dbt-03 584159 500 226 43 231 +133.34 ± 12.29 0 2 67 177 4 +312.48 ± 41.9
478349 ncm-dbt-01 581943 500 230 49 221 +131.74 ± 12.74 0 2 71 171 6 +301.33 ± 40.6
478348 ncm-dbt-05 582945 500 230 33 237 +144.71 ± 12.68 0 0 63 177 10 +336.45 ± 43.03
478347 ncm-dbt-02 587325 500 230 40 230 +138.99 ± 12.09 0 4 54 190 2 +339.63 ± 47.1
478346 ncm-dbt-04 568156 500 228 41 231 +136.56 ± 11.55 0 1 63 184 2 +330.23 ± 43.2
478345 ncm-dbt-03 585000 500 225 40 235 +134.95 ± 11.83 0 2 63 183 2 +324.17 ± 43.32
478344 ncm-dbt-01 583028 500 220 42 238 +129.35 ± 11.81 0 3 66 181 0 +309.64 ± 42.33
478343 ncm-dbt-05 595586 500 224 36 240 +137.37 ± 12.15 0 2 62 182 4 +327.18 ± 43.69
478342 ncm-dbt-02 591986 500 223 38 239 +134.95 ± 11.83 0 1 66 180 3 +321.19 ± 42.12
478341 ncm-dbt-04 566849 500 223 42 235 +131.74 ± 12.14 0 3 65 180 2 +312.48 ± 42.67
478340 ncm-dbt-03 588387 500 215 46 239 +122.24 ± 13.3 1 5 70 172 2 +282.94 ± 41.13
478339 ncm-dbt-01 585253 500 214 46 240 +121.45 ± 13.14 0 6 73 168 3 +275.45 ± 40.24

Commit

Commit ID 2d239de4604f4b7ff3679d4c31ccc8249fde3d00
Author Linmiao Xu
Date 2026-07-10 18:16:42 UTC
Split NEON dense affine accumulation two ways Speedup measured locally with apple-silicon M3 Pro: ``` Result of 50 runs ================== base (./sf-master ) = 1570076 +/- 27215 test (...-neon-2chain) = 1578923 +/- 29000 diff = +8847 +/- 5700 speedup = +0.0056 P(speedup > 0) = 0.9988 CPU: 11 x arm Hyperthreading: off ``` Passed STC: https://tests.stockfishchess.org/tests/view/6a49678cf97ff95f78795b38 LLR: 4.43 (-2.94,2.94) <0.00,2.00> Total: 137696 W: 36041 L: 35477 D: 66178 Ptnml(0-2): 289, 14663, 38396, 15195, 305 closes https://github.com/official-stockfish/Stockfish/pull/6956 No functional change
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