Dev Builds » 20260918-1859

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 06:44:22 584150 3994 1805 265 1924 +141.27 ± 4.34 0 14 474 1464 45 +336.95 ± 15.62
ncm-dbt-02 06:45:30 591247 4004 1839 292 1873 +141.59 ± 4.48 0 20 470 1457 55 +334.3 ± 15.71
ncm-dbt-03 06:45:01 583338 4000 1824 284 1892 +141.03 ± 4.42 0 22 461 1472 45 +336.06 ± 15.87
ncm-dbt-04 06:45:17 567378 4014 1847 254 1913 +145.89 ± 4.26 0 14 431 1517 45 +355.61 ± 16.4
ncm-dbt-05 06:45:19 609310 3988 1840 301 1847 +141.4 ± 4.44 0 17 473 1452 52 +334.68 ± 15.65
20000 9155 1396 9449 +142.23 ± 1.96 0 87 2309 7362 242 +339.39 ± 7.07

Test Detail

ID Host Base NPS Games WLD Standard Elo Ptnml(0-2) Gamepair Elo CLI PGN
485555 ncm-dbt-02 590053 4 2 1 1 +88.51 ± 137.63 0 0 1 1 0 +190.5 ± 634.21
485554 ncm-dbt-04 568633 14 7 0 7 +190.68 ± 7.94 0 0 0 7 0 +1199.83 ± 201.74
485553 ncm-dbt-05 601580 488 231 33 224 +149.57 ± 12.43 0 2 49 186 7 +365.69 ± 49.54
485552 ncm-dbt-01 585084 494 219 35 240 +135.94 ± 11.87 0 2 61 182 2 +327.82 ± 44.07
485551 ncm-dbt-03 584664 500 230 38 232 +140.62 ± 12.02 0 0 64 180 6 +333.32 ± 42.66
485550 ncm-dbt-04 568792 500 222 34 244 +137.37 ± 12.15 0 2 62 182 4 +327.18 ± 43.69
485549 ncm-dbt-02 592159 500 228 35 237 +141.44 ± 12.81 0 3 58 182 7 +333.32 ± 45.35
485548 ncm-dbt-01 584874 500 226 35 239 +139.81 ± 12.26 0 1 63 180 6 +330.23 ± 43.2
485547 ncm-dbt-05 603814 500 229 30 241 +146.36 ± 13.02 0 3 54 184 9 +346.12 ± 47.1
485546 ncm-dbt-03 582945 500 222 41 237 +131.74 ± 12.93 0 4 66 175 5 +304.07 ± 42.38
485545 ncm-dbt-04 567839 500 236 27 237 +154.7 ± 10.74 0 1 42 204 3 +406.2 ± 53.75
485544 ncm-dbt-02 592418 500 236 29 235 +153.02 ± 12.91 0 2 50 187 11 +366.78 ± 49.02
485543 ncm-dbt-01 584495 500 227 31 242 +143.89 ± 12.51 0 3 54 187 6 +346.12 ± 47.1
485542 ncm-dbt-05 597776 500 237 38 225 +146.36 ± 12.18 0 1 56 186 7 +352.8 ± 46.04
485541 ncm-dbt-03 583992 500 236 38 226 +145.54 ± 12.64 0 3 53 187 7 +349.43 ± 47.56
485540 ncm-dbt-04 567284 500 229 27 244 +148.85 ± 11.83 0 1 52 191 6 +366.78 ± 47.92
485539 ncm-dbt-02 593412 500 228 41 231 +136.56 ± 12.59 0 2 65 177 6 +318.25 ± 42.59
485538 ncm-dbt-05 651892 500 232 40 228 +140.62 ± 13.04 0 1 66 173 10 +321.19 ± 42.12
485537 ncm-dbt-01 583112 500 224 34 242 +138.99 ± 12.3 0 1 64 179 6 +327.18 ± 42.83
485536 ncm-dbt-03 584159 500 222 40 238 +132.54 ± 12.71 0 4 64 178 4 +309.64 ± 43.08
485535 ncm-dbt-04 568196 500 236 33 231 +149.68 ± 12.23 0 3 47 194 6 +370.41 ± 50.67
485534 ncm-dbt-02 590267 500 230 28 242 +148.85 ± 12.05 0 1 53 189 7 +363.2 ± 47.43
485533 ncm-dbt-05 603634 500 225 43 232 +132.54 ± 12.32 0 2 68 176 4 +309.64 ± 41.56
485532 ncm-dbt-01 584832 500 221 28 251 +141.44 ± 13.01 0 2 62 177 9 +327.18 ± 43.69
485531 ncm-dbt-03 584159 500 227 27 246 +147.19 ± 11.7 0 3 47 197 3 +370.41 ± 50.67
485530 ncm-dbt-04 566612 500 231 35 234 +143.89 ± 12.71 0 2 58 182 8 +339.63 ± 45.29
485529 ncm-dbt-02 590138 500 225 42 233 +133.34 ± 13.26 0 3 69 170 8 +301.33 ± 41.33
485528 ncm-dbt-01 585211 500 230 27 243 +149.68 ± 11.79 0 0 54 189 7 +366.77 ± 46.78
485527 ncm-dbt-05 610021 500 231 35 234 +143.89 ± 12.09 0 2 55 188 5 +349.43 ± 46.59
485526 ncm-dbt-03 581902 500 225 36 239 +138.18 ± 13.5 0 4 62 175 9 +315.35 ± 43.81
485525 ncm-dbt-04 564723 500 226 36 238 +138.99 ± 11.88 0 2 59 186 3 +336.46 ± 44.87
485524 ncm-dbt-02 590739 500 234 39 227 +143.07 ± 12.54 0 3 55 186 6 +342.85 ± 46.64
485523 ncm-dbt-01 582778 500 233 39 228 +142.25 ± 13.18 0 5 53 185 7 +336.46 ± 47.52
485522 ncm-dbt-05 605117 500 230 38 232 +140.62 ± 12.64 0 2 61 180 7 +330.23 ± 44.08
485521 ncm-dbt-03 582903 500 233 36 231 +144.71 ± 12.47 0 3 53 188 6 +349.43 ± 47.56
485520 ncm-dbt-04 566967 500 237 28 235 +154.7 ± 12.39 0 1 49 190 10 +377.87 ± 49.47
485519 ncm-dbt-02 590138 500 231 40 229 +139.81 ± 12.05 0 3 56 188 3 +339.63 ± 46.2
485518 ncm-dbt-01 582819 500 225 36 239 +138.18 ± 11.26 0 0 63 185 2 +336.45 ± 43.03
485517 ncm-dbt-03 581985 500 229 28 243 +148.02 ± 11.65 0 1 52 192 5 +366.78 ± 47.92
485516 ncm-dbt-04 567363 500 223 34 243 +138.18 ± 12.33 0 2 62 181 5 +327.18 ± 43.69
485515 ncm-dbt-05 600646 500 225 44 231 +131.74 ± 12.54 0 4 64 179 3 +309.64 ± 43.08
485514 ncm-dbt-02 591900 500 225 37 238 +137.37 ± 12.96 0 3 63 177 7 +318.25 ± 43.39

Commit

Commit ID 7a372f3fd71a036ed35d2d474f44a3138be69a0f
Author Stefan Geschwentner
Date 2026-09-18 18:59:16 UTC
Tweak evaluation correction factor. Update (ss - 6)->continuationCorrectionHistory and apply it to correction value calculation. Also scale down the other weights for compensation. Passed STC: LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 96576 W: 24676 L: 24283 D: 47617 Ptnml(0-2): 133, 11165, 25327, 11502, 161 https://tests.stockfishchess.org/tests/view/6a9adaeea8284b37a0a047e5 Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 222570 W: 58024 L: 57343 D: 107203 Ptnml(0-2): 60, 23229, 64029, 23904, 63 https://tests.stockfishchess.org/tests/view/6a9d3e22a8284b37a0a04b67 Passed non-regression VVLTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 37320 W: 9914 L: 9735 D: 17671 Ptnml(0-2): 3, 3133, 12210, 3310, 4 https://tests.stockfishchess.org/tests/view/6aa5a36ba8284b37a0a05aa3 closes https://github.com/official-stockfish/Stockfish/pull/7163 Bench: 1399065
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