Dev Builds » 20181224-0944

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 10:21:05 1968086 4016 2314 81 1621 +217.86 +/- 8.34
ncm-et-4 10:22:06 1947534 3981 2271 78 1632 +215.28 +/- 8.3
ncm-et-9 10:21:12 1974567 4011 2295 76 1640 +216.46 +/- 8.28
ncm-et-10 10:21:51 1969017 3992 2262 85 1645 +212.54 +/- 8.27
ncm-et-13 10:20:08 1976559 4000 2249 95 1656 +209.17 +/- 8.25
20000 11391 415 8194 +214.25 +/- 3.71

Test Detail

ID Host Started (UTC) Duration Base NPS Games Wins Losses Draws Elo CLI PGN
64248 ncm-et-9 2018-12-29 12:53 00:02:25 1972240 11 4 1 6 +97.22 +/- 146.82
64247 ncm-et-3 2018-12-29 12:52 00:03:12 1966459 16 9 0 7 +221.09 +/- 136.08
64246 ncm-et-4 2018-12-29 11:41 01:13:30 1964000 481 280 10 191 +220.54 +/- 24.4
64245 ncm-et-10 2018-12-29 11:40 01:15:13 1960482 492 267 8 217 +203.31 +/- 22.6
64244 ncm-et-13 2018-12-29 11:35 01:18:22 1972196 500 288 8 204 +219.87 +/- 23.48
64243 ncm-et-3 2018-12-29 11:34 01:16:40 1964001 500 309 12 179 +237.58 +/- 25.4
64242 ncm-et-9 2018-12-29 11:33 01:18:18 1987566 500 282 11 207 +210.89 +/- 23.38
64241 ncm-et-4 2018-12-29 10:22 01:18:18 1964305 500 273 9 218 +204.07 +/- 22.61
64240 ncm-et-10 2018-12-29 10:20 01:18:28 1963381 500 306 12 182 +234.38 +/- 25.17
64239 ncm-et-13 2018-12-29 10:16 01:17:46 1976849 500 272 20 208 +192.71 +/- 23.51
64238 ncm-et-9 2018-12-29 10:16 01:16:39 1971886 500 296 12 192 +223.94 +/- 24.43
64237 ncm-et-3 2018-12-29 10:14 01:18:44 1965997 500 287 7 206 +219.87 +/- 23.31
64236 ncm-et-10 2018-12-29 09:01 01:17:37 1981749 500 274 16 210 +198.34 +/- 23.31
64235 ncm-et-4 2018-12-29 08:59 01:22:18 1895571 500 278 13 209 +205.04 +/- 23.3
64234 ncm-et-13 2018-12-29 08:57 01:17:43 1970655 500 289 8 203 +220.88 +/- 23.55
64233 ncm-et-9 2018-12-29 08:57 01:17:26 1964329 500 279 11 210 +207.95 +/- 23.18
64232 ncm-et-3 2018-12-29 08:56 01:16:52 1972561 500 288 10 202 +217.85 +/- 23.68
64231 ncm-et-10 2018-12-29 07:43 01:17:39 1975367 500 286 9 205 +216.85 +/- 23.45
64230 ncm-et-4 2018-12-29 07:41 01:16:12 1964766 500 294 5 201 +229.12 +/- 23.57
64229 ncm-et-9 2018-12-29 07:39 01:16:43 1977902 500 290 9 201 +220.88 +/- 23.72
64228 ncm-et-13 2018-12-29 07:39 01:17:25 1988515 500 290 16 194 +213.85 +/- 24.38
64227 ncm-et-3 2018-12-29 07:38 01:16:56 1968629 500 279 14 207 +205.04 +/- 23.46
64226 ncm-et-10 2018-12-29 06:24 01:18:10 1970324 500 281 7 212 +213.85 +/- 22.92
64225 ncm-et-4 2018-12-29 06:23 01:17:19 1963380 500 282 13 205 +208.93 +/- 23.56
64224 ncm-et-9 2018-12-29 06:21 01:17:10 1971257 500 285 8 207 +216.85 +/- 23.28
64223 ncm-et-13 2018-12-29 06:20 01:17:23 1970480 500 254 15 231 +180.8 +/- 22.01
64222 ncm-et-3 2018-12-29 06:20 01:17:16 1962148 500 292 11 197 +220.88 +/- 24.05
64221 ncm-et-4 2018-12-29 05:06 01:16:25 1967540 500 286 10 204 +215.85 +/- 23.55
64220 ncm-et-10 2018-12-29 05:04 01:18:24 1971910 500 285 7 208 +217.85 +/- 23.18
64219 ncm-et-3 2018-12-29 05:03 01:16:20 1981137 500 276 7 217 +208.93 +/- 22.6
64218 ncm-et-13 2018-12-29 05:02 01:16:52 1973597 500 299 10 191 +229.12 +/- 24.45
64217 ncm-et-9 2018-12-29 05:02 01:17:47 1971881 500 291 7 202 +223.94 +/- 23.58
64216 ncm-et-4 2018-12-29 03:48 01:16:55 1964765 500 278 8 214 +209.91 +/- 22.83
64215 ncm-et-10 2018-12-29 03:46 01:16:54 1965692 500 271 17 212 +194.57 +/- 23.21
64214 ncm-et-3 2018-12-29 03:44 01:17:26 1967539 500 291 7 202 +223.94 +/- 23.58
64213 ncm-et-9 2018-12-29 03:44 01:17:10 1979196 500 281 9 210 +211.87 +/- 23.12
64212 ncm-et-13 2018-12-29 03:44 01:17:32 1985023 500 295 11 194 +223.94 +/- 24.26
64211 ncm-et-10 2018-12-29 02:26 01:19:26 1963231 500 292 9 199 +222.92 +/- 23.85
64210 ncm-et-13 2018-12-29 02:26 01:17:05 1975159 500 262 7 231 +195.51 +/- 21.75
64209 ncm-et-4 2018-12-29 02:25 01:21:09 1895950 500 300 10 190 +230.16 +/- 24.52
64208 ncm-et-3 2018-12-29 02:25 01:17:39 1964304 500 283 13 204 +209.91 +/- 23.63
64207 ncm-et-9 2018-12-29 02:25 01:17:34 1974850 500 287 8 205 +218.86 +/- 23.41

Commit

Commit ID 96ac85b3196ed7369a91a0852da0adcaf05a04b3
Author protonspring
Date 2018-12-24 09:44:38 UTC
Improve endgame KBN vs K (#1877) Even when playing without endgame table bases, this particular endgame should be a win 100% of the time when Stockfish is given a KRBK position, assuming there are enough moves remaining in the FEN to finish the game without hitting the 50 move rule. PROBLEM: The issue with master here is that the PushClose difference per square is 20, however, the difference in squares for the PushToCorners array is usually less. Thus, the engine prefers to move the kings closer together rather than pushing the weak king to the correct corner. What happens is if the weak king is in a safe corner, SF still prefers pushing the kings together. Occasionally, the strong king traps the weak king in the safe corner. It takes a while for SF to figure it out, but often draws the game by the 50 move rule (on shorter time controls). This patch increases the PushToCorners values to correct this problem. We also added an assert to catch any overflow problem if anybody would want to increase the array values again in the future. It was tested in a couple of matches starting with random KRBK positions and showed increased winning rates, see https://github.com/official-stockfish/Stockfish/pull/1877 No functional change
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