Dev Builds » 20260101-1508

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 06:44:30 582038 4000 1709 328 1963 +125.09 ± 4.53 0 33 581 1358 28 +285.81 ± 14.11
ncm-dbt-02 06:45:06 585818 4000 1723 392 1885 +120.18 ± 4.64 1 43 605 1326 25 +271.48 ± 13.84
ncm-dbt-03 06:46:01 585820 3992 1728 356 1908 +124.47 ± 4.55 1 34 578 1358 25 +285.08 ± 14.15
ncm-dbt-04 06:44:57 567461 4008 1709 367 1932 +121.0 ± 4.56 0 37 613 1329 25 +273.72 ± 13.73
ncm-dbt-05 06:45:15 582576 4000 1721 379 1900 +121.26 ± 4.63 1 36 615 1316 32 +272.7 ± 13.7
20000 8590 1822 9588 +122.4 ± 2.05 3 183 2992 6687 135 +277.68 ± 6.21

Test Detail

ID Host Base NPS Games WLD Standard Elo Ptnml(0-2) Gamepair Elo CLI PGN
448329 ncm-dbt-04 567680 8 4 1 3 +136.8 ± 89.09 0 0 1 3 0 +337.69 ± 541.44
448328 ncm-dbt-03 586562 492 215 35 242 +133.28 ± 13.02 0 4 63 174 5 +309.21 ± 43.43
448327 ncm-dbt-05 579496 500 218 42 240 +127.76 ± 12.26 0 2 73 172 3 +295.94 ± 39.99
448326 ncm-dbt-02 584664 500 223 49 228 +126.18 ± 12.87 1 2 72 172 3 +293.29 ± 40.39
448325 ncm-dbt-01 581569 500 212 46 242 +119.89 ± 12.61 0 4 78 166 2 +273.0 ± 38.74
448324 ncm-dbt-04 567403 500 212 44 244 +121.45 ± 13.31 0 7 71 169 3 +275.45 ± 40.84
448323 ncm-dbt-03 584076 500 208 30 262 +129.35 ± 11.6 0 0 74 174 2 +304.07 ± 39.39
448322 ncm-dbt-05 576701 500 196 41 263 +111.37 ± 14.06 0 10 79 157 4 +243.0 ± 38.64
448321 ncm-dbt-02 585211 500 221 58 221 +117.55 ± 12.46 0 4 80 165 1 +268.17 ± 38.21
448320 ncm-dbt-01 581985 500 219 27 254 +140.62 ± 11.36 0 0 61 186 3 +342.85 ± 43.79
448319 ncm-dbt-04 569230 500 213 47 240 +119.89 ± 12.42 0 3 80 165 2 +273.0 ± 38.12
448318 ncm-dbt-05 585885 500 220 56 224 +118.33 ± 14.03 0 10 70 166 4 +263.42 ± 41.06
448317 ncm-dbt-03 583237 500 223 47 230 +127.76 ± 12.45 0 5 65 179 1 +301.33 ± 42.75
448316 ncm-dbt-01 580862 500 216 50 234 +119.89 ± 12.61 0 5 75 169 1 +275.45 ± 39.63
448315 ncm-dbt-02 586604 500 219 58 223 +116.0 ± 13.2 0 5 83 158 4 +256.44 ± 37.51
448314 ncm-dbt-04 566967 500 215 39 246 +127.76 ± 12.84 0 3 73 169 5 +290.66 ± 40.08
448313 ncm-dbt-05 585211 500 206 42 252 +118.33 ± 13.17 0 5 80 161 4 +263.42 ± 38.27
448312 ncm-dbt-01 583363 500 219 37 244 +132.54 ± 13.28 0 3 70 169 8 +298.62 ± 41.01
448311 ncm-dbt-03 586223 500 210 44 246 +119.89 ± 12.42 0 3 80 165 2 +273.0 ± 38.12
448310 ncm-dbt-02 586562 500 221 53 226 +121.45 ± 14.01 0 5 81 155 9 +261.07 ± 38.02
448309 ncm-dbt-04 566414 500 212 44 244 +121.45 ± 13.66 0 9 67 171 3 +275.45 ± 42.01
448308 ncm-dbt-05 581319 500 220 42 238 +129.35 ± 13.54 1 3 69 171 6 +295.94 ± 41.39
448307 ncm-dbt-03 585674 500 216 51 233 +119.11 ± 12.99 0 6 75 167 2 +270.57 ± 39.67
448306 ncm-dbt-01 582152 500 202 42 256 +115.22 ± 12.67 0 4 84 160 2 +258.75 ± 37.2
448305 ncm-dbt-02 584958 500 202 45 253 +112.91 ± 13.04 0 8 77 165 0 +256.44 ± 39.15
448304 ncm-dbt-04 568077 500 213 49 238 +118.33 ± 13.0 0 4 82 160 4 +263.42 ± 37.69
448303 ncm-dbt-03 587409 500 222 55 223 +120.67 ± 12.78 0 3 81 162 4 +270.57 ± 37.86
448302 ncm-dbt-05 584622 500 221 54 225 +120.67 ± 12.41 0 1 85 160 4 +270.57 ± 36.61
448301 ncm-dbt-01 582861 500 214 42 244 +124.6 ± 13.62 0 6 72 166 6 +277.93 ± 40.53
448300 ncm-dbt-02 587197 500 210 38 252 +124.6 ± 13.09 0 7 66 175 2 +288.06 ± 42.4
448299 ncm-dbt-04 567997 500 220 41 239 +130.14 ± 11.99 0 1 72 174 3 +304.07 ± 40.16
448298 ncm-dbt-03 586097 500 219 49 232 +123.02 ± 13.82 0 8 69 168 5 +275.45 ± 41.43
448297 ncm-dbt-05 580945 500 227 57 216 +123.02 ± 12.93 0 2 82 160 6 +273.0 ± 37.5
448296 ncm-dbt-01 581485 500 212 41 247 +123.81 ± 13.28 0 7 68 172 3 +282.94 ± 41.76
448295 ncm-dbt-02 585379 500 209 41 250 +121.45 ± 12.2 0 3 77 169 1 +280.42 ± 38.93
448294 ncm-dbt-04 566612 500 205 51 244 +110.6 ± 13.05 0 6 86 156 2 +245.2 ± 36.85
448293 ncm-dbt-04 566770 500 215 51 234 +118.33 ± 12.81 0 4 81 162 3 +265.78 ± 37.95
448292 ncm-dbt-05 586435 500 213 45 242 +121.45 ± 12.2 0 3 77 169 1 +280.42 ± 38.93
448291 ncm-dbt-02 585970 500 218 50 232 +121.45 ± 14.01 0 9 69 167 5 +270.57 ± 41.4
448290 ncm-dbt-03 587282 500 215 45 240 +123.02 ± 13.64 1 5 71 169 4 +280.42 ± 40.83
448289 ncm-dbt-01 582027 500 215 43 242 +124.6 ± 12.71 0 4 73 170 3 +285.49 ± 40.16

Commit

Commit ID 593eeaf24c062482db095b331f10147e105524be
Author anematode
Date 2026-01-01 15:08:03 UTC
simplify find_nnz a bit This code path is never taken for vector sizes >= 512, so we can simplify it. closes https://github.com/official-stockfish/Stockfish/pull/6501 No functional change
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