Dev Builds » 20260825-1636

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 06:47:48 583918 4000 1810 309 1881 +137.07 ± 4.49 0 18 514 1417 51 +318.98 ± 14.99
ncm-dbt-02 06:47:31 590843 4000 1828 283 1889 +141.54 ± 4.42 0 21 460 1472 47 +337.25 ± 15.89
ncm-dbt-03 06:47:11 576797 4000 1800 293 1907 +137.68 ± 4.29 0 16 493 1459 32 +328.32 ± 15.31
ncm-dbt-04 06:47:51 567569 4000 1799 296 1905 +137.27 ± 4.4 0 20 497 1443 40 +323.79 ± 15.26
ncm-dbt-05 06:47:56 609013 4000 1792 299 1909 +136.26 ± 4.37 0 18 508 1437 37 +321.19 ± 15.08
20000 9029 1480 9491 +137.96 ± 1.97 0 93 2472 7228 207 +325.82 ± 6.83

Test Detail

ID Host Base NPS Games WLD Standard Elo Ptnml(0-2) Gamepair Elo CLI PGN
483665 ncm-dbt-04 568832 500 227 30 243 +144.71 ± 11.83 0 3 50 194 3 +359.68 ± 49.05
483664 ncm-dbt-02 592461 500 232 36 232 +143.89 ± 12.92 0 4 53 186 7 +342.85 ± 47.56
483663 ncm-dbt-05 615284 500 220 42 238 +129.35 ± 12.21 0 0 77 168 5 +295.94 ± 38.53
483662 ncm-dbt-03 576619 500 224 35 241 +138.18 ± 11.48 0 1 61 186 2 +336.46 ± 43.96
483661 ncm-dbt-01 582736 500 212 39 249 +125.38 ± 13.25 0 4 75 165 6 +280.42 ± 39.57
483660 ncm-dbt-04 567324 500 222 34 244 +137.37 ± 12.15 0 1 65 179 5 +324.17 ± 42.47
483659 ncm-dbt-02 591555 500 229 40 231 +138.18 ± 12.53 0 3 60 182 5 +327.18 ± 44.54
483658 ncm-dbt-05 602248 500 216 35 249 +131.74 ± 11.3 0 0 70 179 1 +315.34 ± 40.62
483657 ncm-dbt-03 577643 500 218 32 250 +135.76 ± 13.01 0 5 59 181 5 +318.25 ± 44.96
483656 ncm-dbt-01 584369 500 227 32 241 +143.07 ± 12.34 0 2 57 185 6 +342.85 ± 45.71
483655 ncm-dbt-04 567403 500 223 29 248 +142.25 ± 12.58 0 0 65 176 9 +330.23 ± 42.3
483654 ncm-dbt-02 590653 500 234 35 231 +146.36 ± 12.4 0 3 51 190 6 +356.21 ± 48.54
483653 ncm-dbt-05 601446 500 227 36 237 +139.8 ± 11.84 0 0 64 181 5 +333.32 ± 42.66
483652 ncm-dbt-03 573649 500 221 34 245 +136.56 ± 11.76 0 1 64 182 3 +327.18 ± 42.83
483651 ncm-dbt-01 583782 500 222 32 246 +138.99 ± 12.9 0 4 58 182 6 +327.18 ± 45.37
483650 ncm-dbt-02 591986 500 229 39 232 +138.99 ± 11.66 0 1 61 185 3 +336.46 ± 43.96
483649 ncm-dbt-04 567442 500 228 47 225 +131.74 ± 12.34 0 2 69 175 4 +306.84 ± 41.23
483648 ncm-dbt-05 605342 500 224 35 241 +138.18 ± 12.93 0 5 56 184 5 +327.18 ± 46.19
483647 ncm-dbt-03 574947 500 231 38 231 +141.44 ± 12.61 0 3 57 184 6 +336.46 ± 45.77
483646 ncm-dbt-01 582903 500 230 40 230 +138.99 ± 12.3 0 0 67 176 7 +324.16 ± 41.61
483645 ncm-dbt-02 589710 500 231 44 225 +136.56 ± 12.79 0 2 66 175 7 +315.35 ± 42.24
483644 ncm-dbt-04 569669 500 228 37 235 +139.81 ± 13.07 0 3 61 178 8 +324.17 ± 44.15
483643 ncm-dbt-05 633997 500 227 42 231 +134.95 ± 12.84 0 4 62 179 5 +315.35 ± 43.81
483642 ncm-dbt-03 578095 500 223 33 244 +138.99 ± 11.88 0 2 59 186 3 +336.46 ± 44.87
483641 ncm-dbt-01 584453 500 222 53 225 +122.24 ± 12.76 0 4 76 167 3 +277.93 ± 39.29
483640 ncm-dbt-02 590224 500 225 26 249 +146.36 ± 11.74 0 1 54 190 5 +359.68 ± 46.95
483639 ncm-dbt-04 566060 500 226 39 235 +136.56 ± 12.59 0 5 56 186 3 +327.18 ± 46.19
483638 ncm-dbt-05 602382 500 238 30 232 +153.86 ± 12.44 0 3 44 195 8 +381.7 ± 52.45
483637 ncm-dbt-03 577479 500 235 43 222 +140.62 ± 11.59 0 0 62 184 4 +339.63 ± 43.41
483636 ncm-dbt-01 584159 500 232 42 226 +138.99 ± 12.09 0 1 63 181 5 +330.23 ± 43.2
483635 ncm-dbt-02 591599 500 226 28 246 +145.54 ± 12.22 0 3 51 191 5 +356.21 ± 48.54
483634 ncm-dbt-04 565076 500 218 41 241 +128.55 ± 12.43 0 3 70 174 3 +298.62 ± 41.01
483633 ncm-dbt-05 606471 500 231 44 225 +136.56 ± 12.39 0 1 67 176 6 +318.25 ± 41.77
483632 ncm-dbt-03 578877 500 226 40 234 +135.76 ± 12.21 0 2 64 180 4 +321.19 ± 42.95
483631 ncm-dbt-01 584159 500 232 33 235 +146.36 ± 13.22 0 2 58 179 11 +339.63 ± 45.29
483630 ncm-dbt-02 588558 500 222 35 243 +136.56 ± 13.55 0 4 64 173 9 +309.64 ± 43.08
483629 ncm-dbt-04 568752 500 227 39 234 +137.37 ± 12.56 0 3 61 181 5 +324.17 ± 44.15
483628 ncm-dbt-01 584790 500 233 38 229 +143.07 ± 12.34 0 1 60 182 7 +339.63 ± 44.35
483627 ncm-dbt-05 604937 500 209 35 256 +126.17 ± 12.68 0 5 68 175 2 +293.29 ± 41.75
483626 ncm-dbt-03 577069 500 222 38 240 +134.15 ± 12.47 0 2 67 176 5 +312.48 ± 41.9

Commit

Commit ID 19a02f44e1bfee44b5a00acf6e812c643b8fd54c
Author Robert Nurnberg @ elitebook
Date 2026-08-25 16:36:24 UTC
guarantee PV extension for nodestime and handle MultiPV This PR fixes two minor issues with master's PV extension code. 1. When 'nodestime' is active, master may abort PV extension if it takes too long (as measured in ms), rendering the produced results nondeterministic. The patch always completes the PV extensions. This has no effect on playing strength because the local calls to `pos.do_move()` do not update the global used nodes counter. 2. If standard time management is active, and the game is played with `multiPV > 1`, then extending several PVs may repeatedly use up to `moveOverhead / 2` ms, possibly leading to time losses. The patch fixes this by only extending the PV of the best move during game play. closes https://github.com/official-stockfish/Stockfish/pull/7079 No functional change
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