Dev Builds » 20210613-1000

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 06:45:29 581902 4010 363 1735 1912 -123.87 ± 4.92 65 1287 608 45 0 -270.49 ± 13.8
ncm-dbt-02 06:43:40 586024 4000 338 1777 1885 -130.84 ± 5.05 89 1304 564 43 0 -284.85 ± 14.35
ncm-dbt-03 06:45:24 586177 3990 385 1729 1876 -121.79 ± 5.0 66 1264 613 52 0 -263.77 ± 13.76
ncm-dbt-04 06:45:08 566778 4018 347 1774 1897 -129.01 ± 5.19 99 1280 580 49 1 -276.39 ± 14.15
ncm-dbt-05 06:45:15 581785 3982 336 1751 1895 -129.09 ± 5.05 85 1287 578 40 1 -280.74 ± 14.16
20000 1769 8766 9465 -126.91 ± 2.26 404 6422 2943 229 2 -275.14 ± 6.27

Test Detail

ID Host Base NPS Games WLD Standard Elo Ptnml(0-2) Gamepair Elo CLI PGN
445351 ncm-dbt-01 582402 10 2 3 5 -34.85 ± 119.9 0 2 2 1 0 -70.44 ± 307.49
445350 ncm-dbt-04 566454 18 2 9 7 -142.54 ± 56.5 0 7 2 0 0 -361.06 ± 503.16
445349 ncm-dbt-05 582068 482 36 214 232 -134.67 ± 13.75 9 163 66 3 0 -302.18 ± 42.3
445348 ncm-dbt-03 586901 490 40 213 237 -128.18 ± 14.11 9 160 71 5 0 -281.3 ± 40.79
445347 ncm-dbt-02 586012 500 42 230 228 -137.37 ± 14.6 14 165 66 5 0 -298.62 ± 42.41
445346 ncm-dbt-01 580365 500 38 223 239 -134.95 ± 13.78 11 166 70 3 0 -298.62 ± 41.01
445345 ncm-dbt-04 568395 500 46 227 227 -131.74 ± 16.3 19 153 68 10 0 -268.17 ± 41.66
445344 ncm-dbt-05 582527 500 41 227 232 -135.76 ± 14.12 9 175 59 7 0 -306.84 ± 44.88
445343 ncm-dbt-03 585843 500 54 217 229 -117.55 ± 14.04 7 156 80 7 0 -254.16 ± 38.36
445342 ncm-dbt-02 586054 500 31 218 251 -136.56 ± 14.27 11 171 62 6 0 -304.07 ± 43.81
445341 ncm-dbt-01 581860 500 52 208 240 -112.14 ± 13.56 6 149 90 5 0 -240.82 ± 35.87
445340 ncm-dbt-04 565902 500 37 218 245 -131.74 ± 14.03 10 166 69 5 0 -290.66 ± 41.43
445339 ncm-dbt-03 587070 500 36 224 240 -137.37 ± 13.34 10 170 68 2 0 -309.64 ± 41.56
445338 ncm-dbt-05 581818 500 37 222 241 -134.95 ± 13.78 9 172 64 5 0 -304.07 ± 43.1
445337 ncm-dbt-02 588047 500 47 219 234 -124.6 ± 14.31 9 161 73 7 0 -270.57 ± 40.25
445336 ncm-dbt-01 581277 500 37 225 238 -137.37 ± 14.25 11 172 61 6 0 -306.84 ± 44.17
445335 ncm-dbt-04 565744 500 38 220 242 -132.54 ± 14.53 12 164 68 6 0 -288.06 ± 41.76
445334 ncm-dbt-03 587028 500 52 225 223 -125.38 ± 15.12 13 155 74 8 0 -263.42 ± 39.97
445333 ncm-dbt-05 582444 500 45 227 228 -132.54 ± 14.87 16 154 76 4 0 -277.93 ± 39.29
445332 ncm-dbt-02 586350 500 47 233 220 -135.76 ± 13.57 12 163 74 1 0 -298.62 ± 39.56
445331 ncm-dbt-01 581652 500 54 231 215 -128.55 ± 14.26 12 157 77 4 0 -275.45 ± 39.01
445330 ncm-dbt-04 568554 500 47 221 232 -126.17 ± 13.95 9 161 75 5 0 -275.45 ± 39.63
445329 ncm-dbt-03 586477 500 50 216 234 -119.89 ± 14.19 9 154 81 6 0 -256.44 ± 38.07
445328 ncm-dbt-05 583447 500 46 216 238 -123.02 ± 14.16 10 155 80 5 0 -263.42 ± 38.27
445327 ncm-dbt-02 584748 500 41 211 248 -123.02 ± 13.99 8 160 76 6 0 -268.17 ± 39.39
445326 ncm-dbt-01 581485 500 44 207 249 -117.55 ± 13.87 4 164 73 9 0 -261.07 ± 40.24
445325 ncm-dbt-04 564370 500 43 225 232 -132.54 ± 14.18 10 168 66 6 0 -293.29 ± 42.41
445324 ncm-dbt-03 585590 500 51 216 233 -119.11 ± 14.03 5 164 72 9 0 -263.42 ± 40.52
445323 ncm-dbt-05 579702 500 56 219 225 -117.55 ± 14.37 8 155 79 8 0 -251.89 ± 38.63
445322 ncm-dbt-02 586689 500 53 222 225 -122.24 ± 14.33 10 155 79 6 0 -261.07 ± 38.58
445321 ncm-dbt-04 567482 500 43 220 237 -128.55 ± 15.56 16 152 76 5 1 -268.17 ± 39.39
445320 ncm-dbt-01 582485 500 44 217 239 -125.38 ± 13.79 6 168 69 7 0 -280.42 ± 41.44
445319 ncm-dbt-03 585717 500 50 209 241 -114.45 ± 13.72 5 156 82 7 0 -249.64 ± 37.86
445318 ncm-dbt-05 579124 500 43 213 244 -123.02 ± 14.65 11 155 77 7 0 -261.07 ± 39.14
445317 ncm-dbt-02 584285 500 37 224 239 -136.56 ± 14.1 12 167 67 4 0 -301.33 ± 42.04
445316 ncm-dbt-04 565430 500 53 221 226 -121.45 ± 14.17 10 153 82 5 0 -258.75 ± 37.76
445315 ncm-dbt-01 582903 500 43 205 252 -116.77 ± 13.71 7 153 85 5 0 -251.89 ± 37.03
445314 ncm-dbt-05 583154 500 32 213 255 -131.74 ± 14.37 13 158 77 1 1 -285.49 ± 38.83
445313 ncm-dbt-03 584790 500 52 209 239 -112.91 ± 14.38 8 149 85 8 0 -238.66 ± 37.17
445312 ncm-dbt-02 586012 500 40 220 240 -130.94 ± 15.05 13 162 67 8 0 -280.42 ± 42.05
445311 ncm-dbt-04 568673 500 38 213 249 -126.97 ± 14.94 13 156 74 7 0 -268.17 ± 39.97
445310 ncm-dbt-01 582694 500 49 216 235 -120.67 ± 13.84 8 156 81 5 0 -261.07 ± 38.02

Commit

Commit ID e1f181ee643dcaa92c606b74b3abd23dede136cd
Author Vizvezdenec
Date 2021-06-13 10:00:20 UTC
Do less LMR extensions This patch restricts LMR extensions (of non-transposition table moves) from being used when the transposition table move was extended by two plies via singular extension. This may serve to limit search explosions in certain positions. This makes a lot of sense because the precondition for the tt-move to have been singular extended by two plies is that the result of the alternate search (with excluded the tt-move) has been a hard fail low: it is natural to later search less for non tt-moves in this situation. The current state of depth/extensions/reductions management is getting quite tricky in our search algo, see https://github.com/official-stockfish/Stockfish/pull/3546#issuecomment-860174549 for some discussion. Suggestions welcome! Passed STC https://tests.stockfishchess.org/tests/view/60c3f293457376eb8bcaac8d LLR: 2.95 (-2.94,2.94) <-0.50,2.50> Total: 117984 W: 9698 L: 9430 D: 98856 Ptnml(0-2): 315, 7708, 42703, 7926, 340 passed LTC https://tests.stockfishchess.org/tests/view/60c46ea5457376eb8bcaacc7 LLR: 2.97 (-2.94,2.94) <0.50,3.50> Total: 11280 W: 401 L: 302 D: 10577 Ptnml(0-2): 2, 271, 4998, 364, 5 closes https://github.com/official-stockfish/Stockfish/pull/3546 Bench: 4709974
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