Dev Builds » 20180817-2323

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 08:38:05 1988770 3346 1747 93 1506 +188.23 +/- 8.61
ncm-et-4 08:35:34 1990191 3356 1752 85 1519 +189.33 +/- 8.56
ncm-et-9 08:39:12 1988433 3392 1714 102 1576 +179.56 +/- 8.41
ncm-et-10 08:34:01 1976460 3317 1733 88 1496 +188.97 +/- 8.63
ncm-et-13 08:37:37 1967433 3324 1695 69 1560 +185.87 +/- 8.38
ncm-et-15 08:28:19 1969544 3265 1664 90 1511 +182.64 +/- 8.57
20000 10305 527 9168 +185.74 +/- 3.48

Test Detail

ID Host Started (UTC) Duration Base NPS Games Wins Losses Draws Elo CLI PGN
50238 ncm-et-15 2018-08-18 09:45 00:40:56 1981381 265 137 11 117 +179.66 +/- 31.3
50237 ncm-et-10 2018-08-18 09:36 00:50:52 1942367 317 166 16 135 +178.64 +/- 29.28
50236 ncm-et-13 2018-08-18 09:34 00:52:02 1891969 324 154 7 163 +170.02 +/- 25.78
50235 ncm-et-4 2018-08-18 09:33 00:53:52 1987665 356 187 9 160 +190.85 +/- 26.47
50234 ncm-et-3 2018-08-18 09:32 00:54:26 1988769 346 187 12 147 +193.54 +/- 27.9
50233 ncm-et-9 2018-08-18 09:26 01:00:21 1985621 392 192 19 181 +164.64 +/- 25.1
50232 ncm-et-15 2018-08-18 08:27 01:17:25 1981698 500 259 16 225 +184.42 +/- 22.39
50231 ncm-et-10 2018-08-18 08:19 01:15:50 1979973 500 265 5 230 +200.24 +/- 21.72
50230 ncm-et-13 2018-08-18 08:16 01:17:09 1969096 500 264 11 225 +193.64 +/- 22.25
50229 ncm-et-4 2018-08-18 08:15 01:16:13 1990507 500 274 13 213 +201.19 +/- 23.05
50228 ncm-et-3 2018-08-18 08:13 01:17:32 1988454 500 254 11 235 +184.42 +/- 21.66
50227 ncm-et-9 2018-08-18 08:08 01:17:04 1989716 500 254 15 231 +180.8 +/- 22.01
50226 ncm-et-15 2018-08-18 07:10 01:15:51 1981538 500 254 7 239 +188.08 +/- 21.28
50225 ncm-et-10 2018-08-18 06:59 01:18:47 1984051 500 267 19 214 +189.0 +/- 23.12
50224 ncm-et-13 2018-08-18 06:57 01:17:59 1986408 500 259 10 231 +189.92 +/- 21.86
50223 ncm-et-4 2018-08-18 06:55 01:18:52 1992722 500 274 11 215 +203.11 +/- 22.86
50222 ncm-et-3 2018-08-18 06:55 01:17:08 1989088 500 255 10 235 +186.25 +/- 21.63
50221 ncm-et-9 2018-08-18 06:51 01:16:28 1988770 500 253 12 235 +182.61 +/- 21.69
50220 ncm-et-15 2018-08-18 05:53 01:16:12 1980288 500 263 16 221 +188.08 +/- 22.63
50219 ncm-et-10 2018-08-18 05:39 01:18:32 1983419 500 251 8 241 +184.42 +/- 21.21
50218 ncm-et-13 2018-08-18 05:39 01:17:03 1990665 500 256 11 233 +186.25 +/- 21.78
50217 ncm-et-4 2018-08-18 05:37 01:17:29 1990823 500 252 13 235 +180.8 +/- 21.72
50216 ncm-et-3 2018-08-18 05:36 01:17:52 1990348 500 245 11 244 +176.33 +/- 21.15
50215 ncm-et-9 2018-08-18 05:32 01:17:20 1989716 500 257 12 231 +186.25 +/- 21.92
50214 ncm-et-15 2018-08-18 04:34 01:17:14 1981851 500 257 14 229 +184.42 +/- 22.1
50213 ncm-et-10 2018-08-18 04:22 01:16:03 1980448 500 256 14 230 +183.51 +/- 22.04
50212 ncm-et-13 2018-08-18 04:21 01:16:37 1987981 500 257 11 232 +187.16 +/- 21.83
50211 ncm-et-4 2018-08-18 04:20 01:15:49 1990349 500 258 17 225 +182.61 +/- 22.41
50210 ncm-et-3 2018-08-18 04:19 01:16:00 1988296 500 253 23 224 +172.78 +/- 22.59
50209 ncm-et-9 2018-08-18 04:15 01:15:50 1988930 500 259 16 225 +184.42 +/- 22.39
50208 ncm-et-15 2018-08-18 03:13 01:19:57 1950681 500 254 10 236 +185.33 +/- 21.57
50207 ncm-et-10 2018-08-18 03:04 01:16:58 1980444 500 268 11 221 +197.4 +/- 22.49
50206 ncm-et-4 2018-08-18 03:03 01:16:17 1988612 500 250 10 240 +181.7 +/- 21.34
50205 ncm-et-13 2018-08-18 03:01 01:19:01 1957776 500 259 8 233 +191.78 +/- 21.67
50204 ncm-et-3 2018-08-18 02:59 01:18:49 1987667 500 281 15 204 +206.01 +/- 23.68
50203 ncm-et-9 2018-08-18 02:59 01:15:36 1987981 500 234 17 249 +161.49 +/- 21.05
50202 ncm-et-15 2018-08-18 01:51 01:20:44 1929376 500 240 16 244 +167.53 +/- 21.3
50201 ncm-et-10 2018-08-18 01:46 01:16:59 1984518 500 260 15 225 +186.25 +/- 22.36
50200 ncm-et-4 2018-08-18 01:44 01:17:02 1990664 500 257 12 231 +186.25 +/- 21.92
50199 ncm-et-13 2018-08-18 01:42 01:17:46 1988139 500 246 11 243 +177.22 +/- 21.21
50198 ncm-et-3 2018-08-18 01:42 01:16:18 1988769 500 272 11 217 +201.19 +/- 22.74
50197 ncm-et-9 2018-08-18 01:41 01:16:33 1988297 500 265 11 224 +194.57 +/- 22.31

Commit

Commit ID f3b8a699194515e0b74f5349cf84175a97f824e8
Author Stéphane Nicolet
Date 2018-08-17 23:23:36 UTC
Use an affine formula to mix stats and eval Follow-up for the previous patch: we use an affine formula to mix stats and evaluation in search. The idea is to give a bonus if the previous move of the opponent was historically bad, and a malus if the previous move of the opponent was historically good. More precisely, if x is the stat score of the previous move by the opponent, we implement the following formulas to tweak the evaluation at an internal node of the tree for our pruning decisions at this node: if x = 0, use v' = eval(P) if x > 0, use v' = eval(P) - 5 - x/1024 if x < 0, use v' = eval(P) + 5 - x/1024 For reference, the previous master had this simpler rule: if x > 0, use v' = eval(P) - 10 if x <= 0, use v' = eval(P) STC: LLR: 2.95 (-2.94,2.94) [0.00,5.00] Total: 29322 W: 6359 L: 6088 D: 16875 http://tests.stockfishchess.org/tests/view/5b76a5980ebc5902bdba957f LTC: LLR: 2.96 (-2.94,2.94) [0.00,5.00] Total: 30893 W: 5154 L: 4910 D: 20829 http://tests.stockfishchess.org/tests/view/5b76ca6d0ebc5902bdba9914 Closes https://github.com/official-stockfish/Stockfish/pull/1740 Bench: 4592766
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