Dev Builds » 20180123-1326

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	17:08:54	2017073	6677	2983	266	3428	+150.06 +/- 5.66
ncm-et-4	17:13:43	2016251	6694	3000	258	3436	+151.19 +/- 5.65
ncm-et-9	04:21:18	1989520	1698	769	58	871	+155.01 +/- 11.19
ncm-et-10	04:21:16	1962229	1667	749	65	853	+151.48 +/- 11.35
ncm-et-13	04:20:50	1942686	1636	733	62	841	+151.41 +/- 11.42
ncm-et-15	04:21:10	1934899	1628	723	64	841	+149.18 +/- 11.42
			20000	8957	773	10270	+151.01 +/- 3.27

Test Detail

ID	Host	Started (UTC)	Duration	Base NPS	Games	Wins	Losses	Draws	Elo	PGN
54228	ncm-et-15	2018-09-18 12:17	00:21:07	1910700	128	47	3	78	+124.5 +/- 35.8	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 3188110037 \ -pgnout /tmp/ncm-dbt-20180123-1326-045.pgn \ -openings \ file=/home/chess/www/releases/20180914162857/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=25.12+0.25 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
54227	ncm-et-13	2018-09-18 12:16	00:21:42	1927545	136	61	7	68	+145.98 +/- 40.84	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 1800678141 \ -pgnout /tmp/ncm-dbt-20180123-1326-044.pgn \ -openings \ file=/home/chess/www/releases/20180914162857/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=24.90+0.25 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
54226	ncm-et-10	2018-09-18 12:12	00:26:17	1980755	167	77	11	79	+145.21 +/- 38.25	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 3650779849 \ -pgnout /tmp/ncm-dbt-20180123-1326-043.pgn \ -openings \ file=/home/chess/www/releases/20180914162857/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=24.23+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
54225	ncm-et-3	2018-09-18 12:10	00:28:06	1988619	176	71	10	95	+125.62 +/- 34.17	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 2687953549 \ -pgnout /tmp/ncm-dbt-20180123-1326-042.pgn \ -openings \ file=/home/chess/www/releases/20180914162857/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=24.14+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
54224	ncm-et-4	2018-09-18 12:08	00:30:00	1990349	195	90	8	97	+155.76 +/- 33.98	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 3561514362 \ -pgnout /tmp/ncm-dbt-20180123-1326-041.pgn \ -openings \ file=/home/chess/www/releases/20180914162857/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=24.12+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
54223	ncm-et-9	2018-09-18 12:07	00:30:28	1991139	198	87	9	102	+144.69 +/- 33.04	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 410090500 \ -pgnout /tmp/ncm-dbt-20180123-1326-040.pgn \ -openings \ file=/home/chess/www/releases/20180914162857/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=24.11+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
54222	ncm-et-15	2018-09-18 10:57	01:18:27	1980443	500	225	19	256	+152.18 +/- 20.73	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 3140782446 \ -pgnout /tmp/ncm-dbt-20180123-1326-039.pgn \ -openings \ file=/home/chess/www/releases/20180914162857/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=24.24+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
54221	ncm-et-10	2018-09-18 10:53	01:17:53	1979660	500	230	20	250	+155.54 +/- 21.07	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 2837920795 \ -pgnout /tmp/ncm-dbt-20180123-1326-038.pgn \ -openings \ file=/home/chess/www/releases/20180914162857/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=24.25+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
54220	ncm-et-13	2018-09-18 10:51	01:23:36	1864239	500	222	25	253	+144.72 +/- 21.02	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 1243978890 \ -pgnout /tmp/ncm-dbt-20180123-1326-037.pgn \ -openings \ file=/home/chess/www/releases/20180914162857/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=25.75+0.26 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
54219	ncm-et-3	2018-09-18 10:50	01:18:29	1987666	500	233	18	249	+159.78 +/- 21.08	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 3697050015 \ -pgnout /tmp/ncm-dbt-20180123-1326-036.pgn \ -openings \ file=/home/chess/www/releases/20180914162857/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=24.15+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
54218	ncm-et-9	2018-09-18 10:49	01:16:51	1990190	500	230	20	250	+155.54 +/- 21.07	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 2955847544 \ -pgnout /tmp/ncm-dbt-20180123-1326-035.pgn \ -openings \ file=/home/chess/www/releases/20180914162857/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=24.12+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
54217	ncm-et-4	2018-09-18 10:49	01:18:11	1989559	500	232	14	254	+162.35 +/- 20.7	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 1061180912 \ -pgnout /tmp/ncm-dbt-20180123-1326-034.pgn \ -openings \ file=/home/chess/www/releases/20180914162857/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=24.13+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
54216	ncm-et-13	2018-09-18 09:32	01:17:36	1989717	500	233	18	249	+159.78 +/- 21.08	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 879889392 \ -pgnout /tmp/ncm-dbt-20180123-1326-033.pgn \ -openings \ file=/home/chess/www/releases/20180914162857/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=24.12+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
54215	ncm-et-10	2018-09-18 09:32	01:19:24	1918508	500	224	16	260	+153.86 +/- 20.44	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 4184422196 \ -pgnout /tmp/ncm-dbt-20180123-1326-032.pgn \ -openings \ file=/home/chess/www/releases/20180914162857/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=25.02+0.25 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
54214	ncm-et-15	2018-09-18 09:32	01:23:59	1876085	500	229	27	244	+148.85 +/- 21.53	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 2052936649 \ -pgnout /tmp/ncm-dbt-20180123-1326-031.pgn \ -openings \ file=/home/chess/www/releases/20180914162857/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=25.59+0.26 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
54213	ncm-et-3	2018-09-18 09:32	01:17:25	1991772	500	205	24	271	+131.74 +/- 20.07	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 805969258 \ -pgnout /tmp/ncm-dbt-20180123-1326-030.pgn \ -openings \ file=/home/chess/www/releases/20180914162857/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=24.10+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
54212	ncm-et-9	2018-09-18 09:31	01:16:51	1987509	500	230	11	259	+163.21 +/- 20.33	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 2893115719 \ -pgnout /tmp/ncm-dbt-20180123-1326-029.pgn \ -openings \ file=/home/chess/www/releases/20180914162857/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=24.15+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
54211	ncm-et-4	2018-09-18 09:31	01:16:37	1990664	500	236	19	245	+161.49 +/- 21.32	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 1324596119 \ -pgnout /tmp/ncm-dbt-20180123-1326-028.pgn \ -openings \ file=/home/chess/www/releases/20180914162857/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=24.11+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
54210	ncm-et-4	2018-09-18 08:13	01:16:24	1988454	500	226	25	249	+148.02 +/- 21.23	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 1612414303 \ -pgnout /tmp/ncm-dbt-20180123-1326-027.pgn \ -openings \ file=/home/chess/www/releases/20180914162857/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=24.14+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
54209	ncm-et-3	2018-09-18 08:13	01:17:14	1989875	500	237	23	240	+158.93 +/- 21.68	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 4082335072 \ -pgnout /tmp/ncm-dbt-20180123-1326-026.pgn \ -openings \ file=/home/chess/www/releases/20180914162857/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=24.12+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
54208	ncm-et-10	2018-09-18 08:13	01:17:42	1969996	500	218	18	264	+147.19 +/- 20.28	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 463807437 \ -pgnout /tmp/ncm-dbt-20180123-1326-025.pgn \ -openings \ file=/home/chess/www/releases/20180914162857/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=24.37+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
54207	ncm-et-15	2018-09-18 08:13	01:17:37	1972370	500	222	15	263	+153.02 +/- 20.25	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 3901242571 \ -pgnout /tmp/ncm-dbt-20180123-1326-024.pgn \ -openings \ file=/home/chess/www/releases/20180914162857/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=24.34+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
54206	ncm-et-9	2018-09-18 08:13	01:17:08	1989244	500	222	18	260	+150.51 +/- 20.49	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 537943104 \ -pgnout /tmp/ncm-dbt-20180123-1326-023.pgn \ -openings \ file=/home/chess/www/releases/20180914162857/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=24.13+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
54205	ncm-et-13	2018-09-18 08:13	01:17:56	1989244	500	217	12	271	+151.35 +/- 19.74	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 2370246834 \ -pgnout /tmp/ncm-dbt-20180123-1326-022.pgn \ -openings \ file=/home/chess/www/releases/20180914162857/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=24.13+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
356	ncm-et-3	2018-01-24 04:29	00:00:45	2028850	1	0	0	1	0.0 +/- 30.47	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 100572253 \ -pgnout /tmp/ncm-dbt-20180123-1326-021.pgn \ -openings \ file=/home/chess/www/releases/20180124014906/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=23.66+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
355	ncm-et-4	2018-01-24 03:13	01:17:27	2026226	499	201	20	278	+132.03 +/- 19.61	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 1778861534 \ -pgnout /tmp/ncm-dbt-20180123-1326-020.pgn \ -openings \ file=/home/chess/www/releases/20180124014906/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=23.69+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
354	ncm-et-3	2018-01-24 03:11	01:16:39	2027046	500	227	17	256	+155.54 +/- 20.68	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 1469249134 \ -pgnout /tmp/ncm-dbt-20180123-1326-019.pgn \ -openings \ file=/home/chess/www/releases/20180124014906/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=23.68+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
353	ncm-et-3	2018-01-24 01:53	01:17:00	2028030	500	258	21	221	+179.0 +/- 22.73	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 2645337901 \ -pgnout /tmp/ncm-dbt-20180123-1326-018.pgn \ -openings \ file=/home/chess/www/releases/20180124014906/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=23.67+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
352	ncm-et-4	2018-01-24 01:53	01:18:13	2028031	500	237	19	244	+162.35 +/- 21.38	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 1534167219 \ -pgnout /tmp/ncm-dbt-20180123-1326-017.pgn \ -openings \ file=/home/chess/www/releases/20180124014906/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=23.67+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
351	ncm-et-4	2018-01-23 23:48	01:16:45	2026882	500	228	20	252	+153.86 +/- 20.97	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 244144078 \ -pgnout /tmp/ncm-dbt-20180123-1326-016.pgn \ -openings \ file=/home/chess/www/releases/20180122163422/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=23.68+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
350	ncm-et-3	2018-01-23 23:43	01:17:14	2029673	500	219	18	263	+148.02 +/- 20.34	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 1946389442 \ -pgnout /tmp/ncm-dbt-20180123-1326-015.pgn \ -openings \ file=/home/chess/www/releases/20180122163422/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=23.65+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
349	ncm-et-4	2018-01-23 22:31	01:15:48	2026390	500	231	19	250	+157.24 +/- 21.05	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 1856974625 \ -pgnout /tmp/ncm-dbt-20180123-1326-014.pgn \ -openings \ file=/home/chess/www/releases/20180122163422/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=23.69+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
348	ncm-et-3	2018-01-23 22:26	01:16:02	2026063	500	210	19	271	+139.81 +/- 19.95	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 3496557411 \ -pgnout /tmp/ncm-dbt-20180123-1326-013.pgn \ -openings \ file=/home/chess/www/releases/20180122163422/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=23.69+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
347	ncm-et-4	2018-01-23 21:12	01:17:31	2027538	500	226	24	250	+148.85 +/- 21.16	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 37888577 \ -pgnout /tmp/ncm-dbt-20180123-1326-012.pgn \ -openings \ file=/home/chess/www/releases/20180122163422/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=23.67+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
346	ncm-et-3	2018-01-23 21:08	01:16:23	2024917	500	230	20	250	+155.54 +/- 21.07	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 2895326432 \ -pgnout /tmp/ncm-dbt-20180123-1326-011.pgn \ -openings \ file=/home/chess/www/releases/20180122163422/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=23.70+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
345	ncm-et-4	2018-01-23 19:53	01:17:37	2027374	500	232	14	254	+162.35 +/- 20.7	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 3939713125 \ -pgnout /tmp/ncm-dbt-20180123-1326-010.pgn \ -openings \ file=/home/chess/www/releases/20180122163422/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=23.68+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
344	ncm-et-3	2018-01-23 19:50	01:17:36	2029015	500	210	21	269	+138.18 +/- 20.1	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 3814166233 \ -pgnout /tmp/ncm-dbt-20180123-1326-009.pgn \ -openings \ file=/home/chess/www/releases/20180122163422/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=23.66+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
343	ncm-et-4	2018-01-23 18:35	01:17:40	2028194	500	231	19	250	+157.24 +/- 21.05	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 2878017102 \ -pgnout /tmp/ncm-dbt-20180123-1326-008.pgn \ -openings \ file=/home/chess/www/releases/20180122163422/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=23.67+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
342	ncm-et-3	2018-01-23 18:33	01:15:46	2025081	500	228	16	256	+157.24 +/- 20.65	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 1699930364 \ -pgnout /tmp/ncm-dbt-20180123-1326-007.pgn \ -openings \ file=/home/chess/www/releases/20180122163422/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=23.70+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
341	ncm-et-4	2018-01-23 17:16	01:18:08	2026392	500	204	21	275	+133.34 +/- 19.8	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 302448906 \ -pgnout /tmp/ncm-dbt-20180123-1326-006.pgn \ -openings \ file=/home/chess/www/releases/20180122163422/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=23.69+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
340	ncm-et-3	2018-01-23 17:14	01:17:47	2026554	500	212	18	270	+142.26 +/- 19.98	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 1033588920 \ -pgnout /tmp/ncm-dbt-20180123-1326-005.pgn \ -openings \ file=/home/chess/www/releases/20180122163422/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=23.69+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
339	ncm-et-3	2018-01-23 15:58	01:15:11	2025408	500	209	25	266	+134.15 +/- 20.35	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 1304712394 \ -pgnout /tmp/ncm-dbt-20180123-1326-004.pgn \ -openings \ file=/home/chess/www/releases/20180122163422/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=23.70+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
338	ncm-et-4	2018-01-23 15:57	01:17:15	2025081	500	213	17	270	+143.89 +/- 19.95	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 3185661581 \ -pgnout /tmp/ncm-dbt-20180123-1326-003.pgn \ -openings \ file=/home/chess/www/releases/20180122163422/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=23.70+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
337	ncm-et-4	2018-01-23 14:40	01:16:07	2026391	500	213	19	268	+142.26 +/- 20.1	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 3935162689 \ -pgnout /tmp/ncm-dbt-20180123-1326-002.pgn \ -openings \ file=/home/chess/www/releases/20180122163422/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=23.69+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish
336	ncm-et-3	2018-01-23 14:39	01:17:17	2027538	500	234	16	250	+162.35 +/- 20.97	↓
/home/chess/cutechess/projects/cli/cutechess-cli \ -games 500 \ -concurrency 8 \ -srand 607659523 \ -pgnout /tmp/ncm-dbt-20180123-1326-001.pgn \ -openings \ file=/home/chess/www/releases/20180122163422/stockfish/books/8moves_v3.pgn \ format=pgn \ order=random \ plies=16 \ -repeat \ -resign \ movecount=3 \ score=400 \ -draw \ movenumber=34 \ movecount=8 \ score=20 \ -each \ tc=23.67+0.24 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=2 \ -engine \ name=sf-20180123-1326 \ cmd=/home/chess/devbuilds/bin/x86-64-modern/20180123-1326-254d995e187d8ecd02c3e5613e43aab525e41e22/stockfish \ -engine \ name=sf7 \ cmd=/home/chess/stockfish/7/bin/stockfish

Commit

Commit ID	254d995e187d8ecd02c3e5613e43aab525e41e22
Author	Stéphane Nicolet
Date	2018-01-23 13:26:45 UTC
Contempt 20 Set the default contempt value of Stockfish to 20 centipawns. The contempt feature of Stockfish tries to prevent the engine from simplifying the position too quickly when it feels that it is very slightly behind, instead keeping the tension a little bit longer. Various tests in November 2017 have proved that our current imple- mentation works well against SF7 (which is about 130 Elo weaker than current master) and than the Elo gain is an increasing function of contempt, going (against SF7) from +0 Elo when contempt is set at zero centipawns, to +30 Elo when contempt is 40 centipawns. See pull request 1325 for details: https://github.com/official-stockfish/Stockfish/pull/1325 This november discussion left open the decision of which "default" value for contempt we should use for Stockfish, taking into account the various uses ofStockfish (opening preparation for humans, computer online tournaments,analysis tool for web pages, human/computer play, etc). This pull request proposes to set the default contempt value of SF to twenty centipawns, which turns out to be the highest value which is not a regression against current master, as this seemed to be a good compromise between risk and safety. A couple of SPRT[-3..1] tests were done to bisect this value: Contempt 10: http://tests.stockfishchess.org/tests/view/5a5d42d20ebc5902977e2901 (PASSED) Contempt 15: http://tests.stockfishchess.org/tests/view/5a5d41740ebc5902977e28fa (PASSED) Contempt 20: http://tests.stockfishchess.org/tests/view/5a5d42060ebc5902977e28fc (PASSED) Contempt 25: http://tests.stockfishchess.org/tests/view/5a5d433f0ebc5902977e2904 (FAILED) Surprisingly, a test at "very long time control" hinted that using contempt 20 is not only be non-regressive against contempt 0, but may actually exhibit some small Elo gain, giving a likehood of superio- rity of 88.7% after 8500 games: VLTC: ELO: 2.28 +-3.7 (95%) LOS: 88.7% Total: 8521 W: 1096 L: 1040 D: 6385 http://tests.stockfishchess.org/tests/view/5a60b2820ebc590297b9b7e0 Finally, there was some concerns that a contempt value of 20 would be worse than a value of 7, but a test with 20000 games at STC was neutral: STC: ELO: 0.45 +-3.1 (95%) LOS: 61.2% Total: 20000 W: 4222 L: 4196 D: 11582 http://tests.stockfishchess.org/tests/view/5a64d2fd0ebc590297903868 See the comments in pull request 1361 for the long, nice discussion (180 entries :-)) leading to the decision to propose contempt 20 as the default value: https://github.com/official-stockfish/Stockfish/pull/1361 Whether Stockfish should strictly adhere to the Komodo and Houdini semantics and add the UCI commands to force the contempt to be White in the so-called "analysis mode" is still under discussion, and may be or may not be the object of a future commit. Bench: 5783344