Dev Builds » 20251201-1626

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 06:43:25 581598 4000 1732 389 1879 +121.36 ± 4.65 1 36 616 1313 34 +272.39 ± 13.69
ncm-dbt-02 06:45:06 586795 4014 1728 421 1865 +117.4 ± 4.66 2 37 651 1286 31 +261.52 ± 13.3
ncm-dbt-03 06:44:25 585087 4000 1697 391 1912 +117.75 ± 4.68 0 51 616 1309 24 +264.01 ± 13.72
ncm-dbt-04 06:43:17 567003 4000 1712 386 1902 +119.7 ± 4.65 1 38 626 1304 31 +268.17 ± 13.58
ncm-dbt-05 06:46:13 582360 3986 1717 373 1896 +121.92 ± 4.57 0 32 615 1316 30 +275.03 ± 13.69
20000 8586 1960 9454 +119.62 ± 2.08 4 194 3124 6528 150 +268.17 ± 6.07

Test Detail

ID Host Base NPS Games WLD Standard Elo Ptnml(0-2) Gamepair Elo CLI PGN
443496 ncm-dbt-02 588515 14 5 0 9 +129.72 ± 68.06 0 0 2 5 0 +311.09 ± 530.6
443495 ncm-dbt-05 580489 486 194 44 248 +110.85 ± 13.1 0 4 88 148 3 +243.52 ± 36.2
443494 ncm-dbt-01 582694 500 219 51 230 +121.45 ± 13.49 0 7 72 167 4 +273.0 ± 40.54
443493 ncm-dbt-03 580489 500 211 51 238 +115.22 ± 13.55 0 9 74 165 2 +258.75 ± 39.96
443492 ncm-dbt-04 567522 500 207 58 235 +106.77 ± 13.56 0 8 88 151 3 +232.26 ± 36.48
443491 ncm-dbt-02 585717 500 213 55 232 +113.68 ± 13.04 0 5 85 157 3 +251.89 ± 37.03
443490 ncm-dbt-05 584958 500 216 56 228 +115.22 ± 12.67 0 3 87 157 3 +256.44 ± 36.38
443489 ncm-dbt-01 582569 500 221 50 229 +123.81 ± 13.46 0 5 75 164 6 +275.45 ± 39.63
443488 ncm-dbt-03 586477 500 223 43 234 +130.94 ± 13.14 0 5 65 175 5 +301.33 ± 42.75
443487 ncm-dbt-04 566493 500 210 48 242 +116.77 ± 12.65 0 3 85 159 3 +261.07 ± 36.86
443486 ncm-dbt-02 584622 500 216 55 229 +116.0 ± 12.1 0 0 92 155 3 +258.75 ± 34.84
443485 ncm-dbt-05 579909 500 219 47 234 +124.6 ± 12.71 0 5 70 173 2 +288.06 ± 41.11
443484 ncm-dbt-04 567324 500 218 49 233 +122.24 ± 13.83 0 8 70 167 5 +273.0 ± 41.13
443483 ncm-dbt-02 585464 500 217 54 229 +117.55 ± 13.53 0 7 77 162 4 +261.07 ± 39.14
443482 ncm-dbt-01 581652 500 218 63 219 +111.37 ± 12.69 0 4 89 155 2 +247.41 ± 36.02
443481 ncm-dbt-03 584285 500 211 53 236 +113.68 ± 13.55 0 6 85 154 5 +247.41 ± 37.09
443480 ncm-dbt-05 584369 500 209 47 244 +116.77 ± 13.19 0 4 85 156 5 +256.44 ± 36.95
443479 ncm-dbt-03 586520 500 206 55 239 +108.3 ± 13.4 0 7 88 152 3 +236.51 ± 36.44
443478 ncm-dbt-02 587240 500 232 49 219 +133.34 ± 12.49 0 3 65 178 4 +312.48 ± 42.67
443477 ncm-dbt-04 566533 500 215 56 229 +114.45 ± 13.38 0 6 83 157 4 +251.89 ± 37.57
443476 ncm-dbt-01 580157 500 215 49 236 +119.89 ± 13.16 0 4 81 160 5 +265.78 ± 37.95
443475 ncm-dbt-03 583028 500 214 56 230 +113.68 ± 13.55 0 9 76 163 2 +254.16 ± 39.42
443474 ncm-dbt-05 581111 500 210 49 241 +116.0 ± 13.37 0 6 81 159 4 +256.44 ± 38.07
443473 ncm-dbt-01 578836 500 217 43 240 +126.17 ± 13.06 0 4 73 168 5 +285.49 ± 40.16
443472 ncm-dbt-04 568792 500 212 34 254 +129.35 ± 12.61 0 4 67 176 3 +301.33 ± 42.04
443471 ncm-dbt-02 586181 500 199 62 239 +97.69 ± 13.82 0 10 96 141 3 +207.95 ± 34.86
443470 ncm-dbt-04 567165 500 218 62 220 +112.14 ± 12.69 0 2 94 150 4 +245.2 ± 34.7
443469 ncm-dbt-01 582778 500 208 39 253 +122.24 ± 13.12 0 7 69 172 2 +280.42 ± 41.44
443468 ncm-dbt-03 586350 500 213 40 247 +125.38 ± 12.7 0 5 69 174 2 +290.66 ± 41.43
443467 ncm-dbt-02 588174 500 222 52 226 +123.02 ± 12.56 0 2 80 164 4 +277.93 ± 38.02
443466 ncm-dbt-05 580862 500 224 37 239 +136.56 ± 12.39 0 4 58 185 3 +327.18 ± 45.37
443465 ncm-dbt-01 580613 500 219 46 235 +125.39 ± 13.07 1 1 77 166 5 +285.49 ± 38.83
443464 ncm-dbt-04 562768 500 213 39 248 +126.18 ± 13.42 1 4 69 172 4 +290.66 ± 41.43
443463 ncm-dbt-02 588004 500 216 43 241 +125.38 ± 12.51 0 2 77 167 4 +285.49 ± 38.83
443462 ncm-dbt-03 587240 500 211 40 249 +123.81 ± 12.92 0 6 69 173 2 +285.49 ± 41.44
443461 ncm-dbt-05 583447 500 221 46 233 +126.97 ± 13.04 0 3 75 166 6 +285.49 ± 39.5
443460 ncm-dbt-01 583489 500 215 48 237 +120.67 ± 13.15 0 4 80 161 5 +268.17 ± 38.21
443459 ncm-dbt-04 569430 500 219 40 241 +130.14 ± 12.78 0 3 70 172 5 +298.62 ± 41.01
443458 ncm-dbt-03 586308 500 208 53 239 +111.37 ± 12.87 0 4 90 153 3 +245.2 ± 35.79
443457 ncm-dbt-02 587240 500 208 51 241 +112.91 ± 15.0 2 8 77 157 6 +247.41 ± 39.15
443456 ncm-dbt-05 583740 500 224 47 229 +128.55 ± 12.63 0 3 71 172 4 +295.94 ± 40.69

Commit

Commit ID abd835dcbc3a28481224f6253b00b7420d062513
Author Timothy Herchen
Date 2025-12-01 16:26:50 UTC
Improve update_piece_threats passed on avx512ICL: LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 30240 W: 8026 L: 7726 D: 14488 Ptnml(0-2): 95, 3235, 8171, 3513, 106 https://tests.stockfishchess.org/tests/view/69281d9ab23dfeae38cfeeb8 passed on generic architectures: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 73184 W: 19183 L: 18821 D: 35180 Ptnml(0-2): 258, 7988, 19744, 8338, 264 https://tests.stockfishchess.org/tests/view/6928ba11b23dfeae38cff276 subsequent cleanups tested as: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 72480 W: 18678 L: 18502 D: 35300 Ptnml(0-2): 242, 7925, 19718, 8125, 230 https://tests.stockfishchess.org/tests/view/692a26adb23dfeae38cff566 We add an argument noRaysContaining, which skips all discoveries which contain all bits in the argument; if the argument is from | to, then this will eliminate the discovery. Separately, on AVX512ICL we can speed up the computation of DirtyThreats by moving from a pop_lsb loop to a vector extraction with vpcompressb. See PR for details. closes https://github.com/official-stockfish/Stockfish/pull/6453 No functional change
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