Dev Builds » 20190221-1853

Use this dev build

NCM plays each Stockfish dev build 20,000 times against Stockfish 7. This yields an approximate Elo difference and establishes confidence in the strength of the dev builds.

Summary

Host Duration Avg Base NPS Games Wins Losses Draws Elo
ncm-et-3 08:47:48 1965687 3413 1954 59 1400 +217.46 +/- 8.94
ncm-et-4 08:47:59 1953067 3369 1967 64 1338 +222.34 +/- 9.18
ncm-et-9 08:48:57 1968843 3422 1991 74 1357 +219.97 +/- 9.13
ncm-et-10 08:50:47 1966727 3417 1967 67 1383 +217.87 +/- 9.02
ncm-et-13 07:34:42 1984604 2958 1748 55 1155 +226.18 +/- 9.89
ncm-et-15 08:46:55 1970919 3421 1967 49 1405 +220.2 +/- 8.91
20000 11594 368 8038 +220.53 +/- 3.74

Test Detail

ID Host Started (UTC) Duration Base NPS Games Wins Losses Draws Elo CLI PGN
71360 ncm-et-4 2019-02-24 02:50 00:57:50 1965077 369 210 6 153 +216.27 +/- 27.11
71359 ncm-et-9 2019-02-24 02:44 01:04:10 1976072 422 256 4 162 +239.28 +/- 26.35
71358 ncm-et-15 2019-02-24 02:44 01:04:17 1968023 421 230 9 182 +202.6 +/- 24.84
71357 ncm-et-3 2019-02-24 02:43 01:05:35 1968003 413 240 4 169 +225.71 +/- 25.67
71356 ncm-et-10 2019-02-24 02:42 01:05:48 1973220 417 239 4 174 +221.67 +/- 25.25
71355 ncm-et-13 2019-02-24 02:37 01:10:41 1974984 458 259 5 194 +217.14 +/- 23.9
71354 ncm-et-4 2019-02-24 01:32 01:17:01 1965996 500 302 9 189 +233.32 +/- 24.56
71353 ncm-et-9 2019-02-24 01:25 01:17:44 1969105 500 282 17 201 +205.04 +/- 23.92
71352 ncm-et-3 2019-02-24 01:25 01:16:31 1965997 500 297 7 196 +230.16 +/- 23.99
71351 ncm-et-15 2019-02-24 01:25 01:17:49 1966473 500 289 10 201 +218.86 +/- 23.75
71350 ncm-et-10 2019-02-24 01:23 01:18:34 1969550 500 284 17 199 +206.98 +/- 24.05
71349 ncm-et-13 2019-02-24 01:19 01:17:39 1976693 500 293 18 189 +214.85 +/- 24.76
71348 ncm-et-4 2019-02-24 00:12 01:18:49 1947798 500 288 12 200 +215.85 +/- 23.87
71347 ncm-et-3 2019-02-24 00:06 01:18:18 1970965 500 279 7 214 +211.87 +/- 22.79
71346 ncm-et-15 2019-02-24 00:05 01:18:25 1964926 500 276 8 216 +207.95 +/- 22.7
71345 ncm-et-9 2019-02-24 00:05 01:19:02 1953525 500 304 12 184 +232.26 +/- 25.02
71344 ncm-et-10 2019-02-24 00:04 01:17:13 1959547 500 295 7 198 +228.08 +/- 23.85
71343 ncm-et-13 2019-02-24 00:01 01:16:42 1987073 500 313 10 177 +244.1 +/- 25.51
71342 ncm-et-4 2019-02-23 22:55 01:16:19 1972392 500 293 9 198 +223.94 +/- 23.92
71341 ncm-et-3 2019-02-23 22:48 01:17:03 1961689 500 269 5 226 +204.07 +/- 21.96
71340 ncm-et-10 2019-02-23 22:47 01:16:01 1961082 500 282 5 213 +216.85 +/- 22.77
71339 ncm-et-15 2019-02-23 22:47 01:17:01 1967392 500 285 7 208 +217.85 +/- 23.18
71338 ncm-et-9 2019-02-23 22:46 01:18:11 1972805 500 300 12 188 +228.08 +/- 24.72
71337 ncm-et-13 2019-02-23 22:43 01:17:05 1997242 500 296 9 195 +227.04 +/- 24.13
71336 ncm-et-4 2019-02-23 21:36 01:17:40 1972840 500 308 6 186 +243.0 +/- 24.68
71335 ncm-et-15 2019-02-23 21:31 01:15:18 1984282 500 287 3 210 +223.94 +/- 22.87
71334 ncm-et-3 2019-02-23 21:30 01:16:09 1960777 500 303 11 186 +232.26 +/- 24.84
71333 ncm-et-10 2019-02-23 21:29 01:17:23 1959849 500 291 10 199 +220.88 +/- 23.88
71332 ncm-et-9 2019-02-23 21:28 01:17:07 1973274 500 290 8 202 +221.9 +/- 23.61
71331 ncm-et-13 2019-02-23 21:25 01:17:11 1982183 500 296 4 200 +232.26 +/- 23.59
71330 ncm-et-4 2019-02-23 20:13 01:21:37 1902527 500 278 12 210 +206.01 +/- 23.21
71329 ncm-et-15 2019-02-23 20:13 01:16:56 1977950 500 300 7 193 +233.32 +/- 24.21
71328 ncm-et-3 2019-02-23 20:13 01:16:38 1970997 500 273 15 212 +198.34 +/- 23.16
71327 ncm-et-9 2019-02-23 20:11 01:16:00 1964772 500 281 12 207 +208.93 +/- 23.41
71326 ncm-et-10 2019-02-23 20:09 01:18:21 1964928 500 281 9 210 +211.87 +/- 23.12
71325 ncm-et-13 2019-02-23 20:08 01:15:24 1989449 500 291 9 200 +221.9 +/- 23.78
71324 ncm-et-15 2019-02-23 18:55 01:17:09 1967391 500 300 5 195 +235.45 +/- 23.98
71323 ncm-et-3 2019-02-23 18:54 01:17:34 1961382 500 293 10 197 +222.92 +/- 24.02
71322 ncm-et-4 2019-02-23 18:54 01:18:43 1944843 500 288 10 202 +217.85 +/- 23.68
71321 ncm-et-9 2019-02-23 18:53 01:16:43 1972353 500 278 9 213 +208.93 +/- 22.92
71320 ncm-et-10 2019-02-23 18:51 01:17:27 1978919 500 295 15 190 +219.87 +/- 24.64

Commit

Commit ID badb2aca44d6507f35dafc8b5c3921a6649a40f8
Author Kurtbusch
Date 2019-02-21 18:53:03 UTC
Add KNNvKP Endgame Heuristic This is a somewhat different patch. It fixes blindspots for two knights vs pawn endgame. With local testing starting from random KNNvKP positions where the pawn has not advanced beyond the 4th rank (thanks @protonspring !) at 15+0.15 (4 cores), this went +105=868-27 against master. All except two losses were won in reverse. The heuristic is simple but effective - the strategy in these endgames is to push the opposing king to the corner, then move the knight that's blocking the pawn in for the checkmate while the pawn is free to move and prevents stalemate. This patch gives SF the little boost it needs to search the relevant king-cornering mating lines. See the discussion in pull request 1939 for some more good results for this test in independant tests: https://github.com/official-stockfish/Stockfish/pull/1939 Bench: 3310239
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