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 06:42:39 583378 4000 1722 372 1906 +122.04 ± 4.51 0 34 604 1340 22 +277.93 ± 13.83
ncm-dbt-02 06:43:38 586123 3992 1731 376 1885 +122.8 ± 4.55 2 32 594 1345 23 +280.63 ± 13.95
ncm-dbt-03 06:41:28 584563 4000 1718 420 1862 +116.97 ± 4.6 1 36 652 1286 25 +261.66 ± 13.29
ncm-dbt-04 06:42:23 567599 4008 1720 369 1919 +121.88 ± 4.7 3 40 596 1333 32 +275.26 ± 13.94
ncm-dbt-05 06:43:31 580291 4000 1710 369 1921 +121.16 ± 4.48 0 30 621 1327 22 +275.14 ± 13.61
20000 8601 1906 9493 +120.97 ± 2.04 6 172 3067 6631 124 +274.04 ± 6.13

Test Detail

ID Host Base NPS Games WLD Standard Elo Ptnml(0-2) Gamepair Elo CLI PGN
466114 ncm-dbt-04 569350 8 4 2 2 +88.62 ± 93.84 0 0 2 2 0 +190.67 ± 458.56
466113 ncm-dbt-02 585843 492 203 33 256 +125.2 ± 12.03 0 2 73 170 1 +292.62 ± 39.96
466112 ncm-dbt-05 583196 500 209 50 241 +114.45 ± 12.49 0 2 90 155 3 +254.16 ± 35.58
466111 ncm-dbt-01 584243 500 205 53 242 +109.07 ± 13.23 0 8 83 158 1 +243.0 ± 37.64
466110 ncm-dbt-03 585717 500 214 44 242 +123.02 ± 12.37 0 3 76 169 2 +282.94 ± 39.21
466109 ncm-dbt-04 564370 500 199 55 246 +102.97 ± 13.38 0 7 95 145 3 +221.9 ± 34.93
466108 ncm-dbt-02 586774 500 223 51 226 +124.6 ± 13.27 0 6 70 170 4 +282.94 ± 41.13
466107 ncm-dbt-05 579124 500 213 32 255 +131.74 ± 11.94 0 2 67 179 2 +312.48 ± 41.9
466106 ncm-dbt-01 583614 500 224 48 228 +127.76 ± 13.57 0 6 68 170 6 +288.06 ± 41.76
466105 ncm-dbt-03 584159 500 213 61 226 +109.07 ± 13.4 0 8 84 156 2 +240.82 ± 37.4
466104 ncm-dbt-04 567324 500 217 45 238 +124.6 ± 13.27 1 4 70 172 3 +288.06 ± 41.11
466103 ncm-dbt-02 585717 500 215 49 236 +119.89 ± 13.33 0 6 76 164 4 +268.17 ± 39.39
466102 ncm-dbt-03 584748 500 208 49 243 +114.45 ± 12.49 0 4 84 161 1 +258.75 ± 37.2
466101 ncm-dbt-05 581902 500 209 39 252 +123.02 ± 13.11 0 6 71 170 3 +280.42 ± 40.83
466100 ncm-dbt-01 579951 500 212 46 242 +119.89 ± 12.23 0 3 79 167 1 +275.45 ± 38.39
466099 ncm-dbt-04 566849 500 215 45 240 +123.02 ± 13.11 0 6 71 170 3 +280.42 ± 40.83
466098 ncm-dbt-03 582527 500 207 51 242 +112.14 ± 12.69 0 2 94 150 4 +245.2 ± 34.7
466097 ncm-dbt-02 586689 500 223 55 222 +121.45 ± 12.77 0 4 77 166 3 +275.45 ± 39.01
466096 ncm-dbt-05 578959 500 218 46 236 +124.6 ± 11.74 0 1 77 171 1 +290.66 ± 38.7
466095 ncm-dbt-01 583363 500 210 37 253 +125.38 ± 11.72 0 1 76 172 1 +293.29 ± 38.98
466094 ncm-dbt-04 569230 500 218 40 242 +129.35 ± 14.58 1 6 66 168 9 +288.06 ± 42.4
466093 ncm-dbt-03 582152 500 226 49 225 +128.55 ± 13.19 0 3 74 166 7 +288.06 ± 39.79
466092 ncm-dbt-02 586308 500 209 42 249 +120.67 ± 12.97 1 3 76 168 2 +277.93 ± 39.29
466091 ncm-dbt-05 578259 500 223 42 235 +131.74 ± 12.54 0 3 67 176 4 +306.84 ± 41.99
466090 ncm-dbt-04 570268 500 222 50 228 +124.6 ± 12.9 0 3 77 165 5 +280.42 ± 38.93
466089 ncm-dbt-01 582694 500 216 43 241 +125.38 ± 12.89 0 3 76 166 5 +282.94 ± 39.21
466088 ncm-dbt-03 583866 500 216 61 223 +111.37 ± 14.22 1 8 80 157 4 +245.2 ± 38.39
466087 ncm-dbt-04 567997 500 219 44 237 +126.97 ± 13.04 0 4 72 169 5 +288.06 ± 40.46
466086 ncm-dbt-02 586181 500 221 53 226 +121.46 ± 12.58 1 3 73 173 0 +285.49 ± 40.16
466085 ncm-dbt-05 579702 500 218 55 227 +117.55 ± 13.36 0 6 79 161 4 +261.07 ± 38.58
466084 ncm-dbt-01 583614 500 216 54 230 +116.77 ± 13.71 0 8 76 162 4 +258.75 ± 39.42
466083 ncm-dbt-03 585674 500 218 53 229 +119.11 ± 12.24 0 1 86 160 3 +268.17 ± 36.37
466082 ncm-dbt-04 564252 500 215 45 240 +123.02 ± 13.29 1 4 72 170 3 +282.94 ± 40.5
466081 ncm-dbt-02 586054 500 215 51 234 +118.33 ± 13.7 0 6 80 158 6 +258.75 ± 38.32
466080 ncm-dbt-05 581693 500 211 47 242 +118.33 ± 12.63 0 4 80 164 2 +268.17 ± 38.21
466079 ncm-dbt-01 583070 500 217 45 238 +124.6 ± 12.14 0 2 76 170 2 +288.06 ± 39.11
466078 ncm-dbt-03 587664 500 216 52 232 +118.33 ± 13.17 0 7 74 167 2 +268.17 ± 39.97
466077 ncm-dbt-04 568752 500 211 43 246 +121.45 ± 12.77 0 6 71 172 1 +280.42 ± 40.83
466076 ncm-dbt-01 586477 500 222 46 232 +127.76 ± 12.26 0 3 70 175 2 +298.62 ± 41.01
466075 ncm-dbt-02 585421 500 222 42 236 +130.94 ± 12.17 0 2 69 176 3 +306.84 ± 41.23
466074 ncm-dbt-05 579496 500 209 58 233 +108.3 ± 13.23 0 6 90 151 3 +236.51 ± 35.94

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
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