Dev Builds » 20180904-0843

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 08:41:33 1989876 3357 1777 86 1494 +192.58 +/- 8.65
ncm-et-4 08:41:11 1988996 3387 1782 105 1500 +188.6 +/- 8.66
ncm-et-9 08:40:01 1988838 3355 1726 86 1543 +185.71 +/- 8.48
ncm-et-10 08:35:48 1959429 3298 1721 63 1514 +192.11 +/- 8.52
ncm-et-13 08:38:34 1954575 3260 1699 86 1475 +188.44 +/- 8.69
ncm-et-15 08:37:56 1969215 3343 1730 80 1533 +187.88 +/- 8.5
20000 10435 506 9059 +189.21 +/- 3.5

Test Detail

ID Host Started (UTC) Duration Base NPS Games Wins Losses Draws Elo CLI PGN
52446 ncm-et-13 2018-09-04 20:51 00:41:07 1986721 260 135 7 118 +187.3 +/- 30.86
52445 ncm-et-10 2018-09-04 20:47 00:45:05 1981224 298 161 7 130 +198.71 +/- 29.44
52444 ncm-et-3 2018-09-04 20:38 00:54:24 1988928 357 202 7 148 +212.97 +/- 27.63
52443 ncm-et-15 2018-09-04 20:38 00:54:43 1935311 343 172 8 163 +180.86 +/- 26.02
52442 ncm-et-9 2018-09-04 20:37 00:55:30 1990664 355 193 8 154 +200.78 +/- 27.03
52441 ncm-et-4 2018-09-04 20:34 00:58:42 1991772 387 211 6 170 +204.9 +/- 25.55
52440 ncm-et-13 2018-09-04 19:30 01:20:33 1966219 500 267 12 221 +195.51 +/- 22.52
52439 ncm-et-10 2018-09-04 19:29 01:17:19 1981226 500 253 6 241 +188.08 +/- 21.13
52438 ncm-et-15 2018-09-04 19:21 01:15:57 1982635 500 270 17 213 +193.64 +/- 23.14
52437 ncm-et-3 2018-09-04 19:18 01:19:04 1991772 500 259 8 233 +191.78 +/- 21.67
52436 ncm-et-9 2018-09-04 19:18 01:17:44 1990190 500 258 19 223 +180.8 +/- 22.57
52435 ncm-et-4 2018-09-04 19:16 01:16:36 1986878 500 255 14 231 +182.61 +/- 21.98
52434 ncm-et-10 2018-09-04 18:11 01:16:38 1980285 500 269 12 219 +197.4 +/- 22.64
52433 ncm-et-13 2018-09-04 18:08 01:20:55 1911746 500 269 13 218 +196.45 +/- 22.73
52432 ncm-et-15 2018-09-04 18:03 01:16:52 1980444 500 266 10 224 +196.45 +/- 22.28
52431 ncm-et-9 2018-09-04 17:59 01:17:44 1988927 500 264 13 223 +191.78 +/- 22.43
52430 ncm-et-3 2018-09-04 17:59 01:18:23 1989085 500 270 10 220 +200.24 +/- 22.52
52429 ncm-et-4 2018-09-04 17:56 01:18:28 1989085 500 251 24 225 +170.15 +/- 22.55
52428 ncm-et-10 2018-09-04 16:51 01:18:46 1946097 500 263 9 228 +194.57 +/- 22.0
52427 ncm-et-13 2018-09-04 16:47 01:20:01 1941255 500 257 14 229 +184.42 +/- 22.1
52426 ncm-et-15 2018-09-04 16:44 01:17:36 1976896 500 251 15 234 +178.11 +/- 21.84
52425 ncm-et-9 2018-09-04 16:40 01:17:57 1986407 500 268 12 220 +196.45 +/- 22.58
52424 ncm-et-3 2018-09-04 16:40 01:17:35 1988614 500 276 16 208 +200.24 +/- 23.44
52423 ncm-et-4 2018-09-04 16:38 01:16:58 1988611 500 279 11 210 +207.95 +/- 23.18
52422 ncm-et-10 2018-09-04 15:31 01:19:04 1958926 500 260 9 231 +191.78 +/- 21.82
52421 ncm-et-15 2018-09-04 15:28 01:15:35 1979972 500 246 14 240 +174.55 +/- 21.47
52420 ncm-et-13 2018-09-04 15:27 01:18:53 1952838 500 264 10 226 +194.57 +/- 22.15
52419 ncm-et-3 2018-09-04 15:24 01:15:07 1987509 500 282 17 201 +205.04 +/- 23.92
52418 ncm-et-9 2018-09-04 15:21 01:17:46 1988770 500 244 12 244 +174.55 +/- 21.18
52417 ncm-et-4 2018-09-04 15:21 01:16:19 1990033 500 281 21 198 +200.24 +/- 24.18
52416 ncm-et-10 2018-09-04 14:09 01:20:52 1923697 500 257 7 236 +190.85 +/- 21.46
52415 ncm-et-13 2018-09-04 14:08 01:17:35 1972445 500 262 17 221 +186.25 +/- 22.65
52414 ncm-et-15 2018-09-04 14:08 01:18:31 1946768 500 269 7 224 +202.15 +/- 22.17
52413 ncm-et-3 2018-09-04 14:04 01:18:51 1991614 500 245 15 240 +172.78 +/- 21.5
52412 ncm-et-9 2018-09-04 14:03 01:16:47 1988611 500 244 11 245 +175.44 +/- 21.09
52411 ncm-et-4 2018-09-04 14:03 01:16:53 1988612 500 270 13 217 +197.4 +/- 22.8
52410 ncm-et-10 2018-09-04 12:50 01:18:04 1944548 500 258 13 229 +186.25 +/- 22.07
52409 ncm-et-15 2018-09-04 12:48 01:18:42 1982480 500 256 9 235 +188.08 +/- 21.59
52408 ncm-et-13 2018-09-04 12:48 01:19:30 1950806 500 245 13 242 +174.55 +/- 21.33
52407 ncm-et-9 2018-09-04 12:46 01:16:33 1988299 500 255 11 234 +185.33 +/- 21.72
52406 ncm-et-4 2018-09-04 12:45 01:17:15 1987981 500 235 16 249 +163.21 +/- 21.03
52405 ncm-et-3 2018-09-04 12:45 01:18:09 1991614 500 243 13 244 +172.78 +/- 21.21

Commit

Commit ID 4bef7aa5cd682617502cacfa4413c0d2c78401ca
Author ElbertoOne
Date 2018-09-04 08:43:02 UTC
Parameter tweaks in PSQT and NMP This patch is a combinaison of two parameters tweaks patches which have failed as strong yellows at LTC recently, by Alain Savard (Rocky640) and Fabian Fichter (ianfab): http://tests.stockfishchess.org/tests/view/5b8a71e60ebc592cf2749b1d http://tests.stockfishchess.org/tests/view/5b81ce3b0ebc5902bdbb6585 Passed STC: LLR: 2.95 (-2.94,2.94) [0.00,4.00] Total: 57200 W: 12392 L: 12008 D: 32800 http://tests.stockfishchess.org/tests/view/5b8d0a5a0ebc592cf274c48f And LTC: LLR: 2.96 (-2.94,2.94) [0.00,4.00] Total: 37215 W: 6233 L: 5962 D: 25020 http://tests.stockfishchess.org/tests/view/5b8d56090ebc592cf274cb53 Closes https://github.com/official-stockfish/Stockfish/pull/1764 Bench: 4136116 --------------- How to continue from there? The null move reduction formula in line 769 of search.cpp is quite convoluted and full of mysterious magic constants at the moment, it would certainly be nice to simplify it and/or gain more Elo from it: ``` Depth R = ( (823 + 67 * depth / ONE_PLY) / 256 + std::min(int(eval - beta) / 200, 3)) * ONE_PLY; ```
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