Dev Builds » 20260510-0949

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 06:45:47 568446 4020 1791 315 1914 +133.81 ± 4.41 0 20 532 1420 38 +312.07 ± 14.73
ncm-dbt-02 06:45:15 571508 4002 1762 328 1912 +130.27 ± 4.51 0 27 550 1387 37 +300.07 ± 14.5
ncm-dbt-03 06:46:17 576800 4022 1787 325 1910 +132.34 ± 4.51 0 22 551 1392 46 +304.16 ± 14.47
ncm-dbt-04 06:43:55 551966 3988 1768 338 1882 +130.38 ± 4.55 0 29 544 1383 38 +300.04 ± 14.59
ncm-dbt-05 06:44:22 576033 3968 1805 326 1837 +136.05 ± 4.55 0 26 499 1413 46 +317.0 ± 15.25
20000 8913 1632 9455 +132.56 ± 2.02 0 124 2676 6995 205 +306.56 ± 6.57

Test Detail

ID Host Base NPS Games WLD Standard Elo Ptnml(0-2) Gamepair Elo CLI PGN
468531 ncm-dbt-05 613612 448 205 26 217 +147.0 ± 12.0 0 1 46 174 3 +368.33 ± 51.1
468530 ncm-dbt-01 581236 458 195 28 235 +132.79 ± 13.86 0 2 66 153 8 +297.49 ± 42.14
468529 ncm-dbt-02 586562 462 202 34 226 +132.39 ± 12.47 0 3 58 169 1 +317.48 ± 45.3
468528 ncm-dbt-04 567363 456 196 32 228 +130.8 ± 13.74 0 4 61 158 5 +299.54 ± 44.13
468527 ncm-dbt-03 581569 458 205 37 216 +133.67 ± 13.4 0 2 63 158 6 +306.44 ± 43.23
468526 ncm-dbt-05 515128 500 228 46 226 +132.54 ± 14.53 0 7 65 167 11 +290.66 ± 42.73
468525 ncm-dbt-03 512013 500 234 38 228 +143.89 ± 14.44 0 3 64 167 16 +315.35 ± 43.03
468524 ncm-dbt-04 501063 500 222 55 223 +120.67 ± 12.97 0 2 85 157 6 +265.78 ± 36.75
468523 ncm-dbt-01 510598 500 225 42 233 +133.34 ± 13.08 0 4 65 175 6 +306.84 ± 42.73
468522 ncm-dbt-02 520171 500 227 40 233 +136.56 ± 13.55 0 4 64 173 9 +309.64 ± 43.08
468521 ncm-dbt-05 612826 46 19 4 23 +117.56 ± 38.07 0 0 8 15 0 +270.63 ± 130.4
468520 ncm-dbt-04 567047 62 28 5 29 +135.32 ± 40.41 0 1 7 22 1 +308.01 ± 147.67
468519 ncm-dbt-03 586689 64 27 9 28 +100.41 ± 32.56 0 0 14 18 0 +221.11 ± 91.32
468518 ncm-dbt-02 586646 72 32 5 35 +136.96 ± 32.71 0 1 7 28 0 +338.04 ± 148.98
468517 ncm-dbt-01 584790 90 42 7 41 +142.6 ± 27.98 0 0 11 33 1 +342.46 ± 111.07
468516 ncm-dbt-05 520404 500 221 48 231 +125.38 ± 12.51 0 4 71 173 2 +290.66 ± 40.76
468515 ncm-dbt-04 499738 500 230 45 225 +134.95 ± 12.44 0 3 63 180 4 +318.25 ± 43.39
468514 ncm-dbt-03 584579 500 225 51 224 +126.17 ± 13.95 0 8 66 170 6 +282.94 ± 42.37
468512 ncm-dbt-02 521004 500 229 50 221 +130.14 ± 11.99 0 1 72 174 3 +304.07 ± 40.16
468508 ncm-dbt-01 515847 500 212 39 249 +125.38 ± 12.32 0 4 70 175 1 +293.29 ± 41.07
468506 ncm-dbt-02 584243 468 202 46 220 +120.41 ± 12.9 0 3 74 155 2 +274.3 ± 39.71
468505 ncm-dbt-05 583782 474 209 43 222 +127.05 ± 13.28 0 2 73 156 6 +284.92 ± 39.91
468504 ncm-dbt-04 567126 470 207 35 228 +133.33 ± 12.98 0 2 64 164 5 +308.69 ± 42.89
468503 ncm-dbt-01 585759 472 214 48 210 +127.64 ± 12.02 0 0 72 162 2 +297.89 ± 39.9
468502 ncm-dbt-03 584411 500 218 30 252 +137.37 ± 11.94 0 1 64 181 4 +327.18 ± 42.83
468145 ncm-dbt-05 583447 500 224 43 233 +131.74 ± 12.34 0 2 69 175 4 +306.84 ± 41.23
468144 ncm-dbt-02 587367 500 212 37 251 +126.97 ± 13.41 0 4 74 165 7 +282.94 ± 39.86
468143 ncm-dbt-01 583614 500 225 41 234 +134.15 ± 12.67 0 3 65 177 5 +312.48 ± 42.67
468142 ncm-dbt-03 585084 500 224 48 228 +127.76 ± 12.65 0 2 75 168 5 +290.66 ± 39.4
468141 ncm-dbt-04 566691 500 225 44 231 +131.74 ± 12.34 0 4 63 181 2 +312.48 ± 43.44
468140 ncm-dbt-02 583992 500 216 39 245 +128.55 ± 12.24 0 2 72 173 3 +298.62 ± 40.29
468139 ncm-dbt-01 583154 500 226 32 242 +142.25 ± 11.95 0 0 62 182 6 +339.63 ± 43.41
468138 ncm-dbt-05 582360 500 237 43 220 +142.25 ± 12.16 0 2 57 186 5 +342.85 ± 45.71
468137 ncm-dbt-03 584916 500 220 27 253 +141.44 ± 11.77 0 2 56 189 3 +346.12 ± 46.15
468136 ncm-dbt-04 567839 500 230 35 235 +143.07 ± 12.54 0 4 52 189 5 +346.12 ± 48.03
468135 ncm-dbt-01 584076 500 228 43 229 +134.95 ± 12.44 0 4 60 183 3 +321.19 ± 44.57
468134 ncm-dbt-02 586308 500 223 40 237 +133.34 ± 13.08 0 6 59 181 4 +312.48 ± 44.93
468133 ncm-dbt-04 563665 500 211 48 241 +117.55 ± 13.18 0 7 75 166 2 +265.78 ± 39.69
468132 ncm-dbt-03 585337 500 216 32 252 +134.15 ± 11.86 0 1 67 179 3 +318.25 ± 41.77
468131 ncm-dbt-05 581319 500 227 36 237 +139.81 ± 13.26 0 4 59 179 8 +324.17 ± 44.97
468130 ncm-dbt-01 586943 500 224 35 241 +138.18 ± 12.73 0 3 61 180 6 +324.17 ± 44.15
468129 ncm-dbt-04 567165 500 219 39 242 +130.94 ± 13.14 0 2 74 166 8 +293.29 ± 39.69
468128 ncm-dbt-05 591426 500 235 37 228 +145.54 ± 12.85 0 4 51 188 7 +349.43 ± 48.52
468127 ncm-dbt-03 586604 500 218 53 229 +119.11 ± 12.62 0 3 82 162 3 +268.17 ± 37.61
468126 ncm-dbt-02 587282 500 219 37 244 +132.54 ± 13.28 0 3 70 169 8 +298.62 ± 41.01

Commit

Commit ID a12dc6cc1fdf754fd061780548d57fa89d92f59d
Author FauziAkram
Date 2026-05-10 09:49:00 UTC
VVLTC parameter's tune Passed 1st VVLTC test with STC-bounds: LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 78172 W: 20207 L: 19894 D: 38071 Ptnml(0-2): 2, 6871, 25032, 7174, 7 https://tests.stockfishchess.org/tests/view/69fa262f3a3c3e525bb2b5e7 Passed 2nd VVLTC test with LTC-bounds: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 44360 W: 11624 L: 11322 D: 21414 Ptnml(0-2): 0, 3931, 14022, 4221, 6 https://tests.stockfishchess.org/tests/view/69f8b30d3a3c3e525bb2b3d9 STC estimate test: Elo: -1.50 ± 1.5 (95%) LOS: 2.3% Total: 55742 W: 14169 L: 14409 D: 27164 Ptnml(0-2): 143, 6697, 14452, 6415, 164 nElo: -2.95 ± 2.9 (95%) PairsRatio: 0.96 https://tests.stockfishchess.org/tests/view/69fef06c9392f0c317213dca closes https://github.com/official-stockfish/Stockfish/pull/6807 Bench: 2619968
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