Dev Builds » 20200222-2032

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 03:27:27 582204 2164 21 1424 719 -268.37 ± 9.21 352 699 31 0 0 -735.04 ± 63.76
ncm-dbt-02 03:27:19 586391 2142 26 1408 708 -266.49 ± 9.32 346 691 33 1 0 -711.84 ± 61.56
ncm-dbt-03 03:27:31 585812 2146 28 1385 733 -258.94 ± 8.83 318 722 32 1 0 -717.29 ± 62.59
ncm-dbt-04 03:27:27 568149 2138 35 1380 723 -257.07 ± 9.08 321 704 43 1 0 -667.02 ± 53.44
ncm-dbt-05 03:27:36 582689 2134 31 1377 726 -258.02 ± 9.12 323 701 42 1 0 -670.68 ± 54.11
10724 141 6974 3609 -261.76 ± 4.08 1660 3517 181 4 0 -698.47 ± 25.47

Test Detail

ID Host Base NPS Games WLD Standard Elo Ptnml(0-2) Gamepair Elo CLI PGN
445031 ncm-dbt-05 580945 134 2 83 49 -243.24 ± 31.28 16 49 2 0 0 -727.64 ± 312.68
445030 ncm-dbt-02 588302 142 2 91 49 -255.71 ± 35.09 21 47 3 0 0 -666.24 ± 333.65
445029 ncm-dbt-03 587792 146 4 83 59 -210.43 ± 26.07 11 57 5 0 0 -580.03 ± 220.94
445028 ncm-dbt-04 568315 138 3 89 46 -253.68 ± 37.12 21 44 4 0 0 -609.93 ± 325.23
445027 ncm-dbt-01 582277 164 5 108 51 -256.45 ± 34.97 26 51 5 0 0 -600.9 ± 222.47
445026 ncm-dbt-05 584832 500 5 324 171 -262.24 ± 19.53 79 162 8 1 0 -676.08 ± 142.43
445025 ncm-dbt-03 586816 500 11 321 168 -251.89 ± 18.76 73 164 13 0 0 -629.41 ± 104.8
445024 ncm-dbt-02 582569 500 8 329 163 -264.59 ± 19.55 80 162 7 1 0 -694.74 ± 156.93
445023 ncm-dbt-04 568991 500 9 317 174 -249.64 ± 18.99 73 162 15 0 0 -603.84 ± 95.91
445022 ncm-dbt-01 581610 500 5 327 168 -265.77 ± 19.41 81 160 9 0 0 -694.7 ± 134.18
445021 ncm-dbt-02 585928 500 6 322 172 -258.74 ± 18.26 74 168 8 0 0 -715.51 ± 146.53
445020 ncm-dbt-04 567126 500 10 311 179 -241.91 ± 17.2 63 175 12 0 0 -643.67 ± 110.29
445019 ncm-dbt-05 584201 500 11 309 180 -238.65 ± 17.29 62 174 14 0 0 -616.18 ± 100.06
445018 ncm-dbt-01 581943 500 1 328 171 -271.78 ± 17.73 78 171 1 0 0 -1078.89 ± 154.95
445017 ncm-dbt-03 584327 500 2 335 163 -279.16 ± 19.23 86 161 3 0 0 -887.58 ± 222.18
445016 ncm-dbt-01 584495 500 7 329 164 -265.77 ± 19.97 83 156 11 0 0 -659.13 ± 116.77
445015 ncm-dbt-03 584327 500 9 317 174 -249.64 ± 18.21 69 171 9 1 0 -659.17 ± 131.36
445014 ncm-dbt-02 587622 500 5 336 159 -276.68 ± 20.16 88 155 7 0 0 -739.05 ± 163.27
445013 ncm-dbt-04 568355 500 7 328 165 -264.59 ± 18.7 78 165 7 0 0 -739.05 ± 163.27
445012 ncm-dbt-05 582193 500 6 328 166 -265.77 ± 19.69 82 158 10 0 0 -676.04 ± 124.55
445011 ncm-dbt-01 580696 500 3 332 165 -274.22 ± 19.27 84 161 5 0 0 -798.18 ± 231.48
445010 ncm-dbt-02 587537 500 5 330 165 -269.36 ± 19.57 83 159 8 0 0 -715.51 ± 146.53
445009 ncm-dbt-05 581277 500 7 333 160 -270.57 ± 19.71 84 158 8 0 0 -715.51 ± 146.53
445008 ncm-dbt-03 585801 500 2 329 169 -271.78 ± 18.05 79 169 2 0 0 -958.31 ± 196.57
445007 ncm-dbt-04 567958 500 6 335 159 -274.22 ± 20.15 86 158 5 1 0 -739.1 ± 208.89

Commit

Commit ID b8c00efa2767ebf74545d2ba4bd344ef7c963319
Author Günther Demetz
Date 2020-02-22 20:32:32 UTC
Improve move order near the root Current move histories are known to work well near the leaves, whilst at higher depths they aren't very helpful. To address this problem this patch introduces a table dedicated for what's happening at plies 0-3. It's structured like mainHistory with ply index instead of color. It get cleared with each new search and is filled during iterative deepening at higher depths when recording successful quiet moves near the root or traversing nodes which were in the principal variation (ttPv). Medium TC (20+0.2): https://tests.stockfishchess.org/tests/view/5e4d358790a0a02810d096dc LLR: 2.94 (-2.94,2.94) {-0.50,1.50} Total: 100910 W: 16682 L: 16376 D: 67852 Ptnml(0-2): 1177, 10983, 25883, 11181, 1231 LTC: https://tests.stockfishchess.org/tests/view/5e4e2cb790a0a02810d09714 LLR: 2.95 (-2.94,2.94) {0.25,1.75} Total: 80444 W: 10495 L: 10095 D: 59854 Ptnml(0-2): 551, 7479, 23803, 7797, 592 closes https://github.com/official-stockfish/Stockfish/pull/2557 Bench: 4705960
Copyright 2011–2025 Next Chess Move LLC