Dev Builds » 20260922-1604

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 06:43:31 583896 4000 1817 269 1914 +141.85 ± 4.34 1 16 458 1484 41 +341.24 ± 15.91
ncm-dbt-02 06:44:57 591763 4008 1841 308 1859 +140.0 ± 4.43 0 20 479 1457 48 +331.01 ± 15.56
ncm-dbt-03 06:43:52 584068 4000 1834 257 1909 +144.82 ± 4.24 0 14 435 1511 40 +353.22 ± 16.33
ncm-dbt-04 06:45:12 567758 4000 1790 278 1932 +138.18 ± 4.37 0 22 480 1462 36 +328.7 ± 15.55
ncm-dbt-05 06:45:32 604335 3992 1817 299 1876 +139.1 ± 4.33 0 16 484 1458 38 +331.37 ± 15.46
20000 9099 1411 9490 +140.79 ± 1.94 1 88 2336 7372 203 +336.93 ± 7.03

Test Detail

ID Host Base NPS Games WLD Standard Elo Ptnml(0-2) Gamepair Elo CLI PGN
485685 ncm-dbt-02 591685 8 5 1 2 +190.56 ± 189.63 0 0 1 2 1 +337.69 ± 541.44
485684 ncm-dbt-05 600735 492 222 28 242 +144.84 ± 11.48 0 1 53 189 3 +360.05 ± 47.41
485683 ncm-dbt-04 567284 500 234 38 228 +143.89 ± 12.51 0 3 54 187 6 +346.12 ± 47.1
485682 ncm-dbt-03 583908 500 229 33 238 +143.89 ± 11.65 0 2 53 192 3 +356.21 ± 47.52
485681 ncm-dbt-01 584411 500 228 34 238 +142.25 ± 12.58 0 2 59 182 7 +336.46 ± 44.87
485680 ncm-dbt-02 591211 500 233 35 232 +145.54 ± 12.64 0 4 50 190 6 +352.8 ± 49.02
485679 ncm-dbt-05 602873 500 228 28 244 +147.19 ± 11.92 0 1 54 189 6 +359.68 ± 46.95
485678 ncm-dbt-04 569470 500 229 37 234 +140.62 ± 12.64 0 2 61 180 7 +330.23 ± 44.08
485677 ncm-dbt-03 583321 500 223 29 248 +142.25 ± 11.95 0 2 56 188 4 +346.12 ± 46.15
485676 ncm-dbt-01 583070 500 224 34 242 +138.99 ± 13.1 1 2 59 182 6 +330.23 ± 44.94
485675 ncm-dbt-02 590481 500 213 29 258 +134.14 ± 11.21 0 0 67 182 1 +324.16 ± 41.61
485674 ncm-dbt-04 567601 500 228 33 239 +143.07 ± 12.54 0 3 55 186 6 +342.85 ± 46.64
485673 ncm-dbt-05 599937 500 229 46 225 +133.34 ± 11.88 0 3 62 184 1 +321.19 ± 43.77
485672 ncm-dbt-01 582987 500 227 41 232 +135.75 ± 11.58 0 0 67 180 3 +324.16 ± 41.61
485671 ncm-dbt-02 592374 500 236 32 232 +150.51 ± 11.96 0 1 51 191 7 +370.41 ± 48.42
485670 ncm-dbt-03 585253 500 233 23 244 +155.54 ± 10.93 0 0 45 200 5 +401.91 ± 51.63
485669 ncm-dbt-05 601491 500 226 52 222 +126.17 ± 12.87 0 4 72 170 4 +288.06 ± 40.46
485668 ncm-dbt-04 568514 500 221 36 243 +134.95 ± 11.83 0 3 60 186 1 +327.18 ± 44.54
485667 ncm-dbt-01 584243 500 227 28 245 +146.36 ± 11.97 0 0 58 185 7 +352.79 ± 45.01
485666 ncm-dbt-03 581569 500 235 41 224 +142.25 ± 13.18 0 3 59 179 9 +330.23 ± 44.94
485665 ncm-dbt-02 591512 500 232 39 229 +141.44 ± 12.81 0 2 61 179 8 +330.23 ± 44.08
485664 ncm-dbt-05 600380 500 236 35 229 +148.02 ± 11.88 0 1 53 190 6 +363.2 ± 47.43
485663 ncm-dbt-04 565744 500 217 37 246 +130.94 ± 12.76 0 5 63 179 3 +306.84 ± 43.45
485662 ncm-dbt-02 590181 500 237 40 223 +144.71 ± 12.88 0 3 55 184 8 +342.85 ± 46.64
485661 ncm-dbt-01 584411 500 229 42 229 +136.56 ± 12.18 0 2 63 181 4 +324.17 ± 43.32
485660 ncm-dbt-03 585000 500 232 35 233 +144.71 ± 11.38 0 1 54 192 3 +359.68 ± 46.95
485659 ncm-dbt-05 604442 500 222 38 240 +134.15 ± 13.24 0 2 71 168 9 +301.33 ± 40.6
485658 ncm-dbt-04 569350 500 224 29 247 +143.07 ± 11.47 0 1 56 190 3 +352.8 ± 46.04
485657 ncm-dbt-01 581153 500 234 25 241 +154.7 ± 11.23 0 0 47 197 6 +393.59 ± 50.43
485656 ncm-dbt-03 584327 500 219 36 245 +133.34 ± 12.29 0 3 64 180 3 +315.35 ± 43.03
485655 ncm-dbt-02 591943 500 230 44 226 +135.76 ± 13.2 0 3 66 173 8 +309.64 ± 42.33
485654 ncm-dbt-05 603142 500 223 34 243 +138.18 ± 12.53 0 4 57 185 4 +330.23 ± 45.79
485653 ncm-dbt-04 565037 500 218 36 246 +132.54 ± 13.28 0 4 67 172 7 +301.33 ± 42.04
485652 ncm-dbt-01 583489 500 223 33 244 +138.99 ± 12.7 0 5 54 187 4 +333.32 ± 47.06
485651 ncm-dbt-02 591555 500 226 43 231 +133.34 ± 12.49 0 3 65 178 4 +312.48 ± 42.67
485650 ncm-dbt-03 583196 500 228 33 239 +143.07 ± 12.54 0 3 55 186 6 +342.85 ± 46.64
485649 ncm-dbt-05 621683 500 231 38 231 +141.43 ± 11.77 0 0 62 183 5 +339.63 ± 43.41
485648 ncm-dbt-01 587409 500 225 32 243 +141.44 ± 12.61 0 5 51 190 4 +342.85 ± 48.46
485647 ncm-dbt-04 569071 500 219 32 249 +136.56 ± 11.76 0 1 64 182 3 +327.18 ± 42.83
485646 ncm-dbt-02 594932 500 229 45 226 +134.15 ± 12.86 0 4 63 178 5 +312.48 ± 43.44
485645 ncm-dbt-03 585970 500 235 27 238 +153.86 ± 11.53 0 0 49 194 7 +385.59 ± 49.31

Commit

Commit ID f740707f9d45df53f15316beb3674bea7ebdc54a
Author tony
Date 2026-09-22 16:04:39 UTC
Replace nnueComplexity with simple_eval equivalent This greatly eases future network arch simplifications, namely removing its `psqt` component. This PR squashes and supersedes #7071, the first version, and #7105, the simplified form which was built atop the first version. The vast majority of the credit goes to Tony, and Dubslow assisted in simplifying and admin. The first version tests: Passed STC: https://tests.stockfishchess.org/tests/view/6a72671d2cf557d58a2e1d5b LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 312288 W: 80020 L: 80103 D: 152165 Ptnml(0-2): 473, 37193, 81228, 36444, 806 Passed LTC: https://tests.stockfishchess.org/tests/view/6a7a2a278b9c2482ffa9e00b LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 189792 W: 49500 L: 49452 D: 90840 Ptnml(0-2): 33, 20317, 54212, 20237, 97 Meanwhile, this simplified form had its STC test against the first version, while the second LTC was directly against then-master. Passed STC: https://tests.stockfishchess.org/tests/view/6a85694a9960adfadf924227 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 46624 W: 11969 L: 11764 D: 22891 Ptnml(0-2): 83, 5382, 12176, 5589, 82 Passed LTC: https://tests.stockfishchess.org/tests/view/6a8778415b1b38ebda864f3e LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 250080 W: 64691 L: 64704 D: 120685 Ptnml(0-2): 68, 26659, 71582, 26680, 51 closes https://github.com/official-stockfish/Stockfish/pull/7187 Bench: 1495562
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