Dev Builds » 20190609-1219

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 08:31:25 1966327 3338 1990 72 1276 +227.35 +/- 9.44
ncm-et-4 08:31:25 1951657 3273 1927 69 1277 +223.78 +/- 9.42
ncm-et-9 08:31:26 1973822 3347 1941 57 1349 +221.34 +/- 9.12
ncm-et-10 08:31:14 1965876 3365 1976 64 1325 +224.05 +/- 9.23
ncm-et-13 08:31:23 1972441 3339 1976 72 1291 +225.09 +/- 9.38
ncm-et-15 08:31:28 1976162 3338 1950 63 1325 +222.57 +/- 9.23
20000 11760 397 7843 +224.02 +/- 3.8

Test Detail

ID Host Started (UTC) Duration Base NPS Games Wins Losses Draws Elo CLI PGN
85124 ncm-et-4 2019-06-13 20:29 00:41:53 1961534 273 157 8 108 +212.76 +/- 32.68
85123 ncm-et-15 2019-06-13 20:19 00:52:01 1980988 338 195 8 135 +216.47 +/- 29.1
85122 ncm-et-3 2019-06-13 20:18 00:52:39 1963686 338 174 8 156 +186.76 +/- 26.7
85121 ncm-et-13 2019-06-13 20:18 00:53:07 1969422 339 192 4 143 +217.13 +/- 27.9
85120 ncm-et-9 2019-06-13 20:18 00:53:17 1979403 347 193 7 147 +207.96 +/- 27.69
85119 ncm-et-10 2019-06-13 20:15 00:55:39 1968467 365 209 9 147 +213.83 +/- 27.87
85118 ncm-et-4 2019-06-13 19:11 01:17:26 1972704 500 303 11 186 +232.26 +/- 24.84
85117 ncm-et-13 2019-06-13 19:02 01:14:46 1994835 500 304 13 183 +231.21 +/- 25.11
85116 ncm-et-15 2019-06-13 19:01 01:16:49 1982719 500 284 10 206 +213.85 +/- 23.41
85115 ncm-et-9 2019-06-13 19:00 01:16:02 1962304 500 290 13 197 +216.85 +/- 24.1
85114 ncm-et-3 2019-06-13 19:00 01:17:04 1964456 500 289 17 194 +211.87 +/- 24.39
85113 ncm-et-10 2019-06-13 18:58 01:16:23 1965705 500 310 9 181 +241.91 +/- 25.17
85112 ncm-et-4 2019-06-13 17:50 01:19:56 1936664 500 291 12 197 +218.86 +/- 24.08
85111 ncm-et-15 2019-06-13 17:44 01:16:14 1982343 500 284 10 206 +213.85 +/- 23.41
85110 ncm-et-13 2019-06-13 17:43 01:17:47 1969408 500 297 10 193 +227.04 +/- 24.3
85109 ncm-et-9 2019-06-13 17:42 01:17:16 1971574 500 298 7 195 +231.21 +/- 24.06
85108 ncm-et-3 2019-06-13 17:42 01:17:02 1961996 500 301 11 188 +230.16 +/- 24.69
85107 ncm-et-10 2019-06-13 17:41 01:15:34 1961243 500 285 12 203 +212.86 +/- 23.67
85106 ncm-et-4 2019-06-13 16:33 01:15:53 1965534 500 294 10 196 +223.94 +/- 24.09
85105 ncm-et-15 2019-06-13 16:26 01:16:19 1973279 500 285 11 204 +213.85 +/- 23.58
85104 ncm-et-3 2019-06-13 16:26 01:14:56 1967076 500 313 5 182 +249.64 +/- 24.95
85103 ncm-et-13 2019-06-13 16:26 01:16:26 1972808 500 292 13 195 +218.86 +/- 24.24
85102 ncm-et-9 2019-06-13 16:24 01:16:58 1986114 500 292 5 203 +227.04 +/- 23.43
85101 ncm-et-10 2019-06-13 16:24 01:16:19 1964158 500 300 6 194 +234.38 +/- 24.1
85100 ncm-et-4 2019-06-13 15:11 01:20:29 1924159 500 277 9 214 +207.95 +/- 22.86
85099 ncm-et-3 2019-06-13 15:09 01:15:59 1970540 500 295 12 193 +222.92 +/- 24.36
85098 ncm-et-13 2019-06-13 15:08 01:16:17 1966459 500 291 10 199 +220.88 +/- 23.88
85097 ncm-et-10 2019-06-13 15:08 01:14:24 1965534 500 303 8 189 +235.45 +/- 24.53
85096 ncm-et-15 2019-06-13 15:08 01:17:43 1968012 500 311 7 182 +245.2 +/- 25.02
85095 ncm-et-9 2019-06-13 15:07 01:15:40 1973432 500 279 8 213 +210.89 +/- 22.89
85094 ncm-et-4 2019-06-13 13:53 01:16:47 1971490 500 304 8 188 +236.51 +/- 24.61
85093 ncm-et-15 2019-06-13 13:51 01:15:20 1971745 500 309 9 182 +240.82 +/- 25.09
85092 ncm-et-3 2019-06-13 13:51 01:16:52 1963849 500 320 6 174 +256.44 +/- 25.62
85091 ncm-et-9 2019-06-13 13:50 01:15:50 1973594 500 297 8 195 +229.12 +/- 24.1
85090 ncm-et-13 2019-06-13 13:50 01:16:47 1969086 500 296 12 192 +223.94 +/- 24.43
85089 ncm-et-10 2019-06-13 13:50 01:17:23 1961712 500 277 12 211 +205.04 +/- 23.15
85088 ncm-et-13 2019-06-13 12:33 01:16:13 1965072 500 304 10 186 +234.38 +/- 24.81
85087 ncm-et-3 2019-06-13 12:33 01:16:53 1972689 500 298 13 189 +224.97 +/- 24.67
85086 ncm-et-15 2019-06-13 12:33 01:17:02 1974050 500 282 8 210 +213.85 +/- 23.08
85085 ncm-et-4 2019-06-13 12:33 01:19:01 1929515 500 301 11 188 +230.16 +/- 24.69
85084 ncm-et-10 2019-06-13 12:33 01:15:32 1974316 500 292 8 200 +223.94 +/- 23.75
85083 ncm-et-9 2019-06-13 12:33 01:16:23 1970334 500 292 9 199 +222.92 +/- 23.85

Commit

Commit ID 434b2c72a44ba255c14957f519e3993ea3d5d6bc
Author 31m059
Date 2019-06-09 12:19:07 UTC
Simplify k-value for passers. Bench: 3854907 (#2182) Stockfish evaluates passed pawns in part based on a variable k, which shapes the passed pawn bonus based on the number of squares between the current square and promotion square that are attacked by enemy pieces, and the number defended by friendly ones. Prior to this commit, we gave a large bonus when all squares between the pawn and the promotion square were defended, and if they were not, a somewhat smaller bonus if at least the pawn's next square was. However, this distinction does not appear to provide any Elo at STC or LTC. Where do we go from here? Many promising Elo-gaining patches were attempted in the past few months to refine passed pawn calculation, by altering the definitions of unsafe and defended squares. Stockfish uses these definitions to choose the value of k, so those tests interact with this PR. Therefore, it may be worthwhile to retest previously promising but not-quite-passing tests in the vicinity of this patch. STC: LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 42344 W: 9455 L: 9374 D: 23515 http://tests.stockfishchess.org/tests/view/5cf83ede0ebc5925cf0904fb LTC: LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 69548 W: 11855 L: 11813 D: 45880 http://tests.stockfishchess.org/tests/view/5cf8698f0ebc5925cf0908c8 Bench: 3854907
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