Dev Builds » 20261010-1340

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 06:42:25 583757 4000 1817 273 1910 +141.44 ± 4.39 0 19 464 1471 46 +337.25 ± 15.81
ncm-dbt-02 06:43:01 591292 3996 1825 267 1904 +143.03 ± 4.31 0 19 441 1499 39 +346.33 ± 16.23
ncm-dbt-03 06:42:35 582685 3990 1822 265 1903 +143.17 ± 4.45 1 21 442 1482 49 +343.17 ± 16.22
ncm-dbt-04 06:43:00 568172 4014 1832 274 1908 +142.31 ± 4.29 0 17 454 1497 39 +343.54 ± 15.98
ncm-dbt-05 06:43:06 604417 4000 1820 272 1908 +141.85 ± 4.28 0 16 458 1488 38 +342.04 ± 15.91
20000 9116 1351 9533 +142.36 ± 1.94 1 92 2259 7437 211 +342.45 ± 7.16

Test Detail

ID Host Base NPS Games WLD Standard Elo Ptnml(0-2) Gamepair Elo CLI PGN
486501 ncm-dbt-04 568116 14 7 0 7 +190.68 ± 7.94 0 0 0 7 0 +1467.62 ± 601.83 ↓
486500 ncm-dbt-03 581818 490 228 34 228 +145.51 ± 13.64 1 3 50 183 8 +348.82 ± 49.02 ↓
486499 ncm-dbt-02 591168 496 225 32 239 +142.71 ± 12.62 0 4 52 187 5 +344.53 ± 48.03 ↓
486498 ncm-dbt-01 584748 500 219 32 249 +136.56 ± 12.18 0 3 60 184 3 +327.18 ± 44.54 ↓
486497 ncm-dbt-05 600779 500 230 37 233 +141.44 ± 11.98 0 2 57 187 4 +342.85 ± 45.71 ↓
486496 ncm-dbt-04 567918 500 223 32 245 +139.81 ± 12.47 0 3 58 184 5 +333.32 ± 45.35 ↓
486495 ncm-dbt-01 585970 500 211 38 251 +125.38 ± 13.43 0 4 76 163 7 +277.93 ± 39.29 ↓
486494 ncm-dbt-02 591340 500 221 29 250 +140.62 ± 12.23 0 2 59 184 5 +336.46 ± 44.87 ↓
486493 ncm-dbt-03 585084 500 235 28 237 +153.02 ± 12.91 0 3 47 190 10 +370.41 ± 50.67 ↓
486492 ncm-dbt-05 612088 500 233 35 232 +145.54 ± 12.85 0 3 54 185 8 +346.12 ± 47.1 ↓
486491 ncm-dbt-04 570909 500 225 35 240 +138.99 ± 12.3 0 3 58 185 4 +333.32 ± 45.35 ↓
486490 ncm-dbt-03 582945 500 236 44 220 +140.62 ± 13.24 0 4 58 180 8 +327.18 ± 45.37 ↓
486489 ncm-dbt-01 582819 500 231 35 234 +143.89 ± 11.65 0 0 59 186 5 +349.43 ± 44.59 ↓
486488 ncm-dbt-02 591426 500 230 35 235 +143.07 ± 13.15 0 3 58 180 9 +333.32 ± 45.35 ↓
486487 ncm-dbt-05 598259 500 220 33 247 +136.56 ± 12.79 0 5 57 184 4 +324.17 ± 45.77 ↓
486486 ncm-dbt-04 566336 500 230 31 239 +146.36 ± 11.52 0 2 50 195 3 +366.78 ± 49.02 ↓
486485 ncm-dbt-03 581693 500 224 28 248 +143.89 ± 11.87 0 3 51 193 3 +356.21 ± 48.54 ↓
486484 ncm-dbt-02 592288 500 225 31 244 +142.25 ± 11.95 0 2 56 188 4 +346.12 ± 46.15 ↓
486483 ncm-dbt-01 584579 500 232 27 241 +151.34 ± 12.36 0 2 49 191 8 +370.41 ± 49.56 ↓
486482 ncm-dbt-05 613288 500 226 40 234 +135.76 ± 11.8 0 3 59 187 1 +330.23 ± 44.94 ↓
486481 ncm-dbt-04 569111 500 226 37 237 +138.18 ± 12.53 0 3 60 182 5 +327.18 ± 44.54 ↓
486480 ncm-dbt-02 591857 500 237 35 228 +148.85 ± 11.37 0 2 47 198 3 +377.87 ± 50.67 ↓
486479 ncm-dbt-03 583112 500 226 38 236 +137.37 ± 12.76 0 2 65 176 7 +318.25 ± 42.59 ↓
486478 ncm-dbt-05 599230 500 232 32 236 +147.19 ± 11.7 0 0 56 188 6 +359.67 ± 45.87 ↓
486477 ncm-dbt-01 585801 500 232 32 236 +147.19 ± 12.14 0 2 52 190 6 +359.68 ± 48.01 ↓
486476 ncm-dbt-04 567522 500 227 34 239 +141.44 ± 11.55 0 1 58 188 3 +346.12 ± 45.18 ↓
486475 ncm-dbt-03 582360 500 227 32 241 +143.07 ± 12.12 0 3 53 190 4 +349.43 ± 47.56 ↓
486474 ncm-dbt-02 591297 500 231 34 235 +144.71 ± 11.83 0 2 53 191 4 +356.21 ± 47.52 ↓
486473 ncm-dbt-01 582068 500 234 30 236 +150.51 ± 12.18 0 1 52 189 8 +366.78 ± 47.92 ↓
486472 ncm-dbt-05 605297 500 221 40 239 +131.74 ± 11.73 0 1 69 178 2 +312.48 ± 41.11 ↓
486471 ncm-dbt-04 566809 500 244 27 229 +161.49 ± 12.41 0 2 40 197 11 +406.2 ± 55.21 ↓
486470 ncm-dbt-03 581943 500 221 32 247 +138.18 ± 11.7 0 1 62 184 3 +333.32 ± 43.57 ↓
486469 ncm-dbt-02 591168 500 223 38 239 +134.95 ± 12.64 0 3 64 178 5 +315.35 ± 43.03 ↓
486468 ncm-dbt-01 586223 500 235 40 225 +143.07 ± 11.69 0 0 60 185 5 +346.11 ± 44.19 ↓
486467 ncm-dbt-05 605884 500 227 23 250 +150.51 ± 12.18 0 1 52 189 8 +366.78 ± 47.92 ↓
486466 ncm-dbt-04 567958 500 224 41 235 +133.34 ± 12.29 0 2 67 177 4 +312.48 ± 41.9 ↓
486465 ncm-dbt-03 582527 500 225 29 246 +143.89 ± 12.3 0 2 56 186 6 +346.12 ± 46.15 ↓
486464 ncm-dbt-01 577848 500 223 39 238 +134.15 ± 13.24 0 7 56 183 4 +315.35 ± 46.07 ↓
486463 ncm-dbt-02 589796 500 233 33 234 +147.19 ± 11.47 0 1 52 193 4 +366.78 ± 47.92 ↓
486462 ncm-dbt-05 600513 500 231 32 237 +146.36 ± 11.74 0 1 54 190 5 +359.68 ± 46.95 ↓
486461 ncm-dbt-04 568872 500 226 37 237 +138.18 ± 11.91 0 1 63 182 4 +330.23 ± 43.2 ↓

Commit

Commit ID 186d6a41c1303317e4af31ed1859673f6699c12b
Author mstembera
Date 2026-10-10 13:40:07 UTC
One instance of reductions array STC https://tests.stockfishchess.org/tests/view/6abc689cc109910452a9aa6d LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 144288 W: 36608 L: 36515 D: 71165 Ptnml(0-2): 189, 15260, 41141, 15377, 177 Use just one reductions array by all workers instead of separate instances. (Now possible since we don't depend on thread count any more) closes https://github.com/official-stockfish/Stockfish/pull/7205 No functional change
Copyright 2011–2026 Next Chess Move LLC