Dev Builds » 20260426-0735

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 06:39:25 583769 4000 1796 300 1904 +136.56 ± 4.31 0 19 496 1455 30 +324.91 ± 15.27
ncm-dbt-02 06:41:20 585552 3998 1776 334 1888 +131.21 ± 4.33 0 16 553 1402 28 +306.39 ± 14.42
ncm-dbt-03 06:41:09 585033 4000 1777 349 1874 +129.75 ± 4.62 0 33 549 1375 43 +296.27 ± 14.53
ncm-dbt-04 06:40:47 567697 4002 1786 303 1913 +135.18 ± 4.36 0 18 516 1433 34 +318.35 ± 14.96
ncm-dbt-05 06:39:19 585494 4000 1786 348 1866 +130.74 ± 4.41 0 18 560 1388 34 +302.7 ± 14.33
20000 8921 1634 9445 +132.68 ± 1.97 0 104 2674 7053 169 +309.5 ± 6.56

Test Detail

ID Host Base NPS Games WLD Standard Elo Ptnml(0-2) Gamepair Elo CLI PGN
468879 ncm-dbt-04 569230 2 1 0 1 +189.7 ± 55.98 0 0 0 1 0 +1129.65 ± 376.02
468878 ncm-dbt-02 585000 498 222 35 241 +137.17 ± 12.4 0 1 66 176 6 +320.38 ± 42.11
468877 ncm-dbt-03 585379 500 229 43 228 +135.76 ± 12.81 0 2 67 174 7 +312.48 ± 41.9
468876 ncm-dbt-04 568554 500 226 46 228 +130.94 ± 13.32 0 3 72 167 8 +293.29 ± 40.39
468875 ncm-dbt-01 584369 500 231 38 231 +141.44 ± 11.77 0 2 56 189 3 +346.12 ± 46.15
468874 ncm-dbt-05 583656 500 226 48 226 +129.35 ± 13.17 0 4 70 170 6 +293.29 ± 41.07
468873 ncm-dbt-02 584958 500 222 36 242 +135.76 ± 11.8 0 1 65 181 3 +324.17 ± 42.47
468872 ncm-dbt-03 585421 500 220 38 242 +132.54 ± 12.91 0 4 65 176 5 +306.84 ± 42.73
468871 ncm-dbt-04 567086 500 221 36 243 +134.95 ± 12.84 0 4 62 179 5 +315.35 ± 43.81
468870 ncm-dbt-05 580862 500 228 45 227 +133.34 ± 11.88 0 0 71 175 4 +312.47 ± 40.3
468869 ncm-dbt-01 582110 500 223 41 236 +132.54 ± 11.91 0 2 66 180 2 +315.35 ± 42.24
468868 ncm-dbt-03 579868 500 219 51 230 +121.45 ± 12.95 0 5 75 167 3 +275.45 ± 39.63
468867 ncm-dbt-02 589454 500 219 52 229 +120.67 ± 12.6 0 4 77 167 2 +275.45 ± 39.01
468866 ncm-dbt-04 569190 500 225 35 240 +138.99 ± 12.09 0 1 63 181 5 +330.23 ± 43.2
468865 ncm-dbt-05 579785 500 226 39 235 +136.56 ± 12.18 0 3 60 184 3 +327.18 ± 44.54
468864 ncm-dbt-01 582485 500 226 39 235 +136.56 ± 12.98 0 5 58 182 5 +321.19 ± 45.36
468863 ncm-dbt-03 586604 500 230 39 231 +139.81 ± 12.47 0 5 52 190 3 +339.63 ± 47.98
468862 ncm-dbt-02 583824 500 222 41 237 +131.74 ± 11.94 0 1 70 176 3 +309.64 ± 40.79
468861 ncm-dbt-05 579413 500 216 40 244 +127.76 ± 12.45 0 4 68 176 2 +298.62 ± 41.71
468860 ncm-dbt-04 564213 500 217 35 248 +132.54 ± 11.7 0 2 65 182 1 +318.25 ± 42.59
468859 ncm-dbt-01 581527 500 224 35 241 +138.18 ± 12.12 0 2 61 183 4 +330.23 ± 44.08
468858 ncm-dbt-03 584790 500 214 54 232 +115.22 ± 13.38 0 6 82 158 4 +254.16 ± 37.82
468857 ncm-dbt-02 583992 500 227 49 224 +129.35 ± 12.21 0 2 71 174 3 +301.33 ± 40.6
468856 ncm-dbt-01 585632 500 220 36 244 +134.15 ± 12.27 0 2 66 178 4 +315.35 ± 42.24
468855 ncm-dbt-05 581277 500 215 44 241 +123.81 ± 12.16 0 0 83 163 4 +280.42 ± 36.95
468854 ncm-dbt-04 566375 500 226 36 238 +138.99 ± 12.09 0 2 60 184 4 +333.32 ± 44.47
468853 ncm-dbt-02 585759 500 221 44 235 +128.55 ± 12.24 0 4 66 179 1 +304.07 ± 42.38
468852 ncm-dbt-03 586350 500 232 40 228 +140.62 ± 13.04 0 2 63 176 9 +324.17 ± 43.32
468851 ncm-dbt-01 583740 500 226 38 236 +137.37 ± 12.36 0 3 60 183 4 +327.18 ± 44.54
468850 ncm-dbt-04 567640 500 222 31 247 +139.81 ± 12.05 0 3 56 188 3 +339.63 ± 46.2
468849 ncm-dbt-05 584076 500 218 46 236 +124.6 ± 12.9 0 3 77 165 5 +280.42 ± 38.93
468848 ncm-dbt-02 586393 500 220 38 242 +132.54 ± 12.52 0 1 72 171 6 +304.07 ± 40.16
468847 ncm-dbt-03 584958 500 214 48 238 +119.89 ± 13.68 0 7 75 163 5 +265.78 ± 39.69
468846 ncm-dbt-04 567640 500 223 47 230 +127.76 ± 12.06 0 1 75 171 3 +295.94 ± 39.27
468845 ncm-dbt-01 585169 500 229 37 234 +140.62 ± 12.23 0 2 59 184 5 +336.46 ± 44.87
468844 ncm-dbt-05 582152 500 228 39 233 +138.18 ± 12.12 0 2 61 183 4 +330.23 ± 44.08
468843 ncm-dbt-04 569350 500 225 37 238 +137.37 ± 12.36 0 2 63 180 5 +324.17 ± 43.32
468842 ncm-dbt-02 585042 500 223 39 238 +134.15 ± 12.27 0 2 66 178 4 +315.35 ± 42.24
468841 ncm-dbt-01 585126 500 217 36 247 +131.74 ± 11.94 0 1 70 176 3 +309.64 ± 40.79
468840 ncm-dbt-03 586901 500 219 36 245 +133.34 ± 12.89 0 2 70 171 7 +304.07 ± 40.91
468839 ncm-dbt-05 612733 500 229 47 224 +132.54 ± 12.71 0 2 70 172 6 +304.07 ± 40.91

Commit

Commit ID c787509663dface7637dc3985bab516070736678
Author FauziAkram
Date 2026-04-26 07:35:37 UTC
Simplify time management reduction logic Simplify the time management reduction logic by replacing the previous sigmoid function with the linear interpolate function introduced in #6729 , resulting in a cleaner and more efficient calculation of move stability that avoids unnecessary exponential operations. Passed STC non-reg: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 161856 W: 41933 L: 41852 D: 78071 Ptnml(0-2): 418, 18137, 43792, 18108, 473 https://tests.stockfishchess.org/tests/view/69e117a46f344a1917600148 Passed LTC non-reg: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 108726 W: 27819 L: 27692 D: 53215 Ptnml(0-2): 59, 11084, 31942, 11227, 51 https://tests.stockfishchess.org/tests/view/69e563c00e9667dd5a7652ac This is a follow-up for #6091 #6729 closes https://github.com/official-stockfish/Stockfish/pull/6765 No functional change
Copyright 2011–2026 Next Chess Move LLC