Dev Builds » 20260625-1109

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 06:44:48 583113 4000 1739 339 1922 +126.97 ± 4.45 0 28 569 1378 25 +292.96 ± 14.25
ncm-dbt-02 06:45:39 590742 4000 1788 323 1889 +133.44 ± 4.41 0 15 545 1400 40 +310.0 ± 14.52
ncm-dbt-03 06:45:16 584577 3996 1773 325 1898 +131.89 ± 4.36 0 21 535 1415 27 +309.09 ± 14.69
ncm-dbt-04 06:46:31 567911 4014 1786 302 1926 +134.83 ± 4.4 0 25 505 1445 32 +317.86 ± 15.15
ncm-dbt-05 06:46:32 582887 3990 1770 352 1868 +129.11 ± 4.54 1 26 558 1374 36 +296.76 ± 14.39
20000 8856 1641 9503 +131.24 ± 1.98 1 115 2712 7012 160 +305.18 ± 6.52

Test Detail

ID Host Base NPS Games WLD Standard Elo Ptnml(0-2) Gamepair Elo CLI PGN
475640 ncm-dbt-04 565823 14 7 0 7 +190.68 ± 7.94 0 0 0 7 0 +1199.83 ± 201.74
475639 ncm-dbt-05 585000 490 223 32 235 +142.99 ± 12.71 0 3 54 182 6 +342.13 ± 47.09
475638 ncm-dbt-03 588984 496 216 37 243 +131.3 ± 13.2 0 5 64 174 5 +302.43 ± 43.1
475637 ncm-dbt-02 588856 500 224 47 229 +128.55 ± 13.01 0 3 73 168 6 +290.66 ± 40.08
475636 ncm-dbt-01 585674 500 214 39 247 +126.97 ± 12.28 0 1 77 168 4 +290.66 ± 38.7
475635 ncm-dbt-04 564840 500 230 45 225 +134.95 ± 12.24 0 3 62 182 3 +321.19 ± 43.77
475634 ncm-dbt-03 587240 500 235 46 219 +138.18 ± 12.73 0 1 67 174 8 +318.25 ± 41.77
475633 ncm-dbt-05 584159 500 216 48 236 +121.45 ± 13.14 0 4 79 162 5 +270.57 ± 38.47
475632 ncm-dbt-02 592159 500 224 28 248 +143.89 ± 12.09 0 1 58 185 6 +346.12 ± 45.18
475631 ncm-dbt-01 584495 500 205 43 252 +116.77 ± 12.83 0 6 77 166 1 +265.78 ± 39.12
475630 ncm-dbt-04 568116 500 221 38 241 +133.34 ± 12.29 0 1 70 174 5 +309.64 ± 40.79
475629 ncm-dbt-03 584034 500 218 39 243 +130.14 ± 12.19 0 2 70 175 3 +304.07 ± 40.91
475628 ncm-dbt-05 582485 500 226 31 243 +143.07 ± 12.12 0 1 59 184 6 +342.85 ± 44.76
475627 ncm-dbt-01 582068 500 223 39 238 +134.15 ± 12.27 0 1 69 175 5 +312.48 ± 41.11
475626 ncm-dbt-02 592634 500 221 48 231 +125.38 ± 13.43 0 4 76 163 7 +277.93 ± 39.29
475625 ncm-dbt-04 569390 500 221 37 242 +134.15 ± 13.43 0 5 63 175 7 +306.84 ± 43.45
475624 ncm-dbt-03 585885 500 211 37 252 +126.17 ± 12.68 0 4 71 172 3 +290.66 ± 40.76
475623 ncm-dbt-01 581111 500 210 49 241 +116.0 ± 12.84 0 6 78 165 1 +263.42 ± 38.85
475622 ncm-dbt-02 591426 500 217 37 246 +130.94 ± 11.96 0 2 68 178 2 +309.64 ± 41.56
475621 ncm-dbt-05 585126 500 220 55 225 +119.11 ± 12.99 0 4 81 161 4 +265.78 ± 37.95
475620 ncm-dbt-04 567205 500 217 39 244 +129.35 ± 12.41 0 4 66 178 2 +304.07 ± 42.38
475619 ncm-dbt-03 583531 500 224 47 229 +128.55 ± 12.04 0 1 74 172 3 +298.62 ± 39.56
475618 ncm-dbt-01 584243 500 220 38 242 +132.54 ± 11.7 0 2 65 182 1 +318.25 ± 42.59
475617 ncm-dbt-02 591082 500 227 43 230 +134.15 ± 11.86 0 1 67 179 3 +318.25 ± 41.77
475616 ncm-dbt-05 581860 500 224 47 229 +128.55 ± 13.56 0 7 64 174 5 +293.29 ± 43.07
475615 ncm-dbt-04 568514 500 228 40 232 +137.37 ± 11.73 0 1 63 183 3 +330.23 ± 43.2
475614 ncm-dbt-03 577233 500 228 34 238 +142.25 ± 11.28 0 2 53 194 1 +356.21 ± 47.52
475613 ncm-dbt-02 589283 500 219 31 250 +137.37 ± 11.73 0 1 63 183 3 +330.23 ± 43.2
475612 ncm-dbt-05 583321 500 229 47 224 +132.54 ± 12.71 1 1 67 177 4 +312.48 ± 41.9
475611 ncm-dbt-01 584748 500 225 43 232 +132.54 ± 12.91 0 5 62 179 4 +309.64 ± 43.82
475610 ncm-dbt-04 568037 500 214 43 243 +123.81 ± 13.63 0 7 70 168 5 +277.93 ± 41.14
475609 ncm-dbt-03 586308 500 217 36 247 +131.74 ± 11.73 0 2 66 181 1 +315.35 ± 42.24
475608 ncm-dbt-02 592029 500 229 46 225 +133.34 ± 12.89 0 1 73 168 8 +301.33 ± 39.86
475607 ncm-dbt-01 582945 500 220 41 239 +130.14 ± 12.59 0 4 66 177 3 +304.07 ± 42.38
475606 ncm-dbt-05 581860 500 214 49 237 +119.11 ± 12.24 0 2 83 163 2 +270.57 ± 37.24
475605 ncm-dbt-04 571913 500 226 23 251 +149.68 ± 11.32 0 1 49 196 4 +377.87 ± 49.47
475604 ncm-dbt-03 583405 500 224 49 227 +126.97 ± 12.66 0 4 70 173 3 +293.29 ± 41.07
475603 ncm-dbt-02 588472 500 227 43 230 +134.15 ± 12.47 0 2 67 176 5 +312.48 ± 41.9
475602 ncm-dbt-01 579620 500 222 47 231 +126.97 ± 13.04 0 3 75 166 6 +285.49 ± 39.5
475601 ncm-dbt-04 567363 500 222 37 241 +134.95 ± 12.24 0 3 62 182 3 +321.19 ± 43.77
475600 ncm-dbt-05 579289 500 218 43 239 +126.97 ± 12.85 0 4 71 171 4 +290.66 ± 40.76

Commit

Commit ID 5b87bc48cd73995f02bc790e50239a83d622f838
Author zungur
Date 2026-06-25 11:09:03 UTC
Remove unused search-layer APIs The following have zero call sites repo-wide: SearchManager::id: never read or written (also never initialized, nor was it ever used). Search::Worker::elapsed_time(): never called. PV output uses tm.elapsed_time() (TimeManager) directly. (removed callers on 25361e5) MovePicker::begin()/end(): unused private accessors. (removed callers on 8c2d21f) closes https://github.com/official-stockfish/Stockfish/pull/6909 No functional change
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