Dev Builds » 20260415-1815

Use this dev build

NCM plays each Stockfish dev build 20,000 times against Stockfish 15. This yields an approximate Elo difference and establishes confidence in the strength of the dev builds.

Summary

Host	Duration	Avg Base NPS	Games	WLD	Standard Elo	Ptnml(0-2)	Gamepair Elo
ncm-dbt-01	06:41:11	583163	3998	1765 353 1880	+128.23 ± 4.47	0 24 571 1372 32	+294.84 ± 14.21
ncm-dbt-02	06:41:21	585640	4004	1744 361 1899	+125.15 ± 4.52	0 32 583 1359 28	+286.02 ± 14.08
ncm-dbt-03	06:40:45	585165	4000	1762 364 1874	+126.77 ± 4.54	0 30 575 1362 33	+289.68 ± 14.18
ncm-dbt-04	06:40:41	566369	4000	1748 372 1880	+124.6 ± 4.46	0 26 598 1350 26	+284.85 ± 13.87
ncm-dbt-05	06:41:37	580943	3998	1740 347 1911	+126.34 ± 4.51	0 33 567 1372 27	+290.23 ± 14.29
			20000	8759 1797 9444	+126.22 ± 2.01	0 145 2894 6815 146	+289.1 ± 6.31

Test Detail

ID	Host	Base NPS	Games	WLD	Standard Elo	Ptnml(0-2)	Gamepair Elo	PGN
464471	ncm-dbt-02	586816	4	2 1 1	+88.51 ± 137.63	0 0 1 1 0	+190.5 ± 634.21	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 1846869306 \ -pgnout ncm-dbt-20260415-1815-041.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464470	ncm-dbt-05	579372	498	220 37 241	+133.93 ± 12.1	0 3 62 182 2	+320.38 ± 43.76	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 2629542579 \ -pgnout ncm-dbt-20260415-1815-040.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464469	ncm-dbt-01	584706	498	220 38 240	+133.13 ± 13.12	0 4 65 174 6	+306.03 ± 42.72	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 919490102 \ -pgnout ncm-dbt-20260415-1815-039.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464468	ncm-dbt-04	566493	500	213 56 231	+112.91 ± 12.13	0 3 87 160 0	+256.44 ± 36.38	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 1081289222 \ -pgnout ncm-dbt-20260415-1815-038.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464467	ncm-dbt-03	584748	500	223 40 237	+133.34 ± 12.89	0 2 70 171 7	+304.07 ± 40.91	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 3238808032 \ -pgnout ncm-dbt-20260415-1815-037.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464466	ncm-dbt-02	587113	500	216 34 250	+132.54 ± 12.32	0 4 62 182 2	+315.35 ± 43.81	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 211967909 \ -pgnout ncm-dbt-20260415-1815-036.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464465	ncm-dbt-05	583489	500	210 44 246	+119.89 ± 12.98	0 5 77 165 3	+270.57 ± 39.07	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 4118788170 \ -pgnout ncm-dbt-20260415-1815-035.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464464	ncm-dbt-04	567007	500	221 50 229	+123.81 ± 12.73	0 4 74 169 3	+282.94 ± 39.86	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 1229967253 \ -pgnout ncm-dbt-20260415-1815-034.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464463	ncm-dbt-01	585126	500	218 47 235	+123.81 ± 13.63	0 8 67 171 4	+280.42 ± 42.05	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 3222051530 \ -pgnout ncm-dbt-20260415-1815-033.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464462	ncm-dbt-03	587409	500	225 34 241	+139.81 ± 11.84	0 2 58 187 3	+339.63 ± 45.29	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 3638491067 \ -pgnout ncm-dbt-20260415-1815-032.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464461	ncm-dbt-02	586435	500	215 51 234	+118.33 ± 12.44	0 2 85 160 3	+265.78 ± 36.75	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 3976548933 \ -pgnout ncm-dbt-20260415-1815-031.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464460	ncm-dbt-05	578465	500	215 49 236	+119.89 ± 13.16	0 4 81 160 5	+265.78 ± 37.95	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 3284714321 \ -pgnout ncm-dbt-20260415-1815-030.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464459	ncm-dbt-01	581236	500	220 43 237	+128.55 ± 12.04	0 1 74 172 3	+298.62 ± 39.56	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 3817352698 \ -pgnout ncm-dbt-20260415-1815-029.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464458	ncm-dbt-04	565272	500	226 40 234	+135.76 ± 12.42	0 2 65 178 5	+318.25 ± 42.59	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 3960297966 \ -pgnout ncm-dbt-20260415-1815-028.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464457	ncm-dbt-02	585590	500	216 47 237	+122.24 ± 13.12	0 4 78 163 5	+273.0 ± 38.74	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 3789814615 \ -pgnout ncm-dbt-20260415-1815-027.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464456	ncm-dbt-03	585337	500	214 40 246	+126.17 ± 13.06	0 5 70 171 4	+288.06 ± 41.11	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 514232937 \ -pgnout ncm-dbt-20260415-1815-026.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464455	ncm-dbt-05	584537	500	222 42 236	+130.94 ± 12.37	0 4 64 180 2	+309.64 ± 43.08	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 890417174 \ -pgnout ncm-dbt-20260415-1815-025.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464454	ncm-dbt-01	580696	500	225 44 231	+131.74 ± 12.34	0 0 75 169 6	+301.33 ± 39.1	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 1118634911 \ -pgnout ncm-dbt-20260415-1815-024.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464453	ncm-dbt-03	583321	500	219 56 225	+117.55 ± 13.0	0 4 83 159 4	+261.07 ± 37.44	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 2914587701 \ -pgnout ncm-dbt-20260415-1815-023.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464452	ncm-dbt-02	586520	500	207 41 252	+119.89 ± 12.61	0 4 78 166 2	+273.0 ± 38.74	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 2982943614 \ -pgnout ncm-dbt-20260415-1815-022.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464451	ncm-dbt-04	567561	500	215 46 239	+122.24 ± 12.76	0 4 76 167 3	+277.93 ± 39.29	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 3794977445 \ -pgnout ncm-dbt-20260415-1815-021.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464450	ncm-dbt-05	582736	500	225 46 229	+130.14 ± 13.16	0 5 66 174 5	+298.62 ± 42.41	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 3199810435 \ -pgnout ncm-dbt-20260415-1815-020.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464449	ncm-dbt-01	581652	500	218 41 241	+128.55 ± 12.82	0 4 69 173 4	+295.94 ± 41.39	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 1088345705 \ -pgnout ncm-dbt-20260415-1815-019.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464448	ncm-dbt-03	584495	500	220 37 243	+133.34 ± 12.89	0 4 64 177 5	+309.64 ± 43.08	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 3525914760 \ -pgnout ncm-dbt-20260415-1815-018.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464447	ncm-dbt-02	582569	500	219 39 242	+130.94 ± 12.56	0 3 68 175 4	+304.07 ± 41.65	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 1477516217 \ -pgnout ncm-dbt-20260415-1815-017.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464446	ncm-dbt-04	568156	500	224 46 230	+129.35 ± 12.8	0 3 71 171 5	+295.94 ± 40.69	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 4044495975 \ -pgnout ncm-dbt-20260415-1815-016.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464445	ncm-dbt-05	579537	500	220 57 223	+117.55 ± 12.46	0 1 89 156 4	+261.07 ± 35.67	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 3892856138 \ -pgnout ncm-dbt-20260415-1815-015.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464444	ncm-dbt-01	584159	500	215 50 235	+119.11 ± 12.62	0 3 82 162 3	+268.17 ± 37.61	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 4289536531 \ -pgnout ncm-dbt-20260415-1815-014.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464443	ncm-dbt-02	586731	500	223 44 233	+130.14 ± 12.39	0 4 65 179 2	+306.84 ± 42.73	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 3494242324 \ -pgnout ncm-dbt-20260415-1815-013.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464442	ncm-dbt-03	584034	500	215 40 245	+126.97 ± 12.85	0 6 65 177 2	+295.94 ± 42.75	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 679942167 \ -pgnout ncm-dbt-20260415-1815-012.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464441	ncm-dbt-04	567680	500	218 47 235	+123.81 ± 13.1	0 4 76 165 5	+277.93 ± 39.29	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 3385598463 \ -pgnout ncm-dbt-20260415-1815-011.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464440	ncm-dbt-05	580945	500	214 31 255	+133.34 ± 12.89	0 6 58 183 3	+315.35 ± 45.33	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 1965858712 \ -pgnout ncm-dbt-20260415-1815-010.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464439	ncm-dbt-04	562651	500	217 38 245	+130.14 ± 12.19	0 4 64 181 1	+309.64 ± 43.08	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 2219479883 \ -pgnout ncm-dbt-20260415-1815-009.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464438	ncm-dbt-01	583614	500	227 54 219	+125.38 ± 13.25	0 4 75 165 6	+280.42 ± 39.57	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 2023410675 \ -pgnout ncm-dbt-20260415-1815-008.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464437	ncm-dbt-03	585506	500	215 62 223	+109.83 ± 12.34	0 3 92 154 1	+245.2 ± 35.25	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 1469811234 \ -pgnout ncm-dbt-20260415-1815-007.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464436	ncm-dbt-02	584916	500	224 51 225	+125.38 ± 13.43	0 6 70 169 5	+282.94 ± 41.13	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 3261874060 \ -pgnout ncm-dbt-20260415-1815-006.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464435	ncm-dbt-01	584117	500	222 36 242	+135.76 ± 10.91	0 0 64 186 0	+333.32 ± 42.66	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 14859472 \ -pgnout ncm-dbt-20260415-1815-005.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464434	ncm-dbt-04	566138	500	214 49 237	+119.11 ± 12.62	0 2 85 159 4	+265.78 ± 36.75	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 2334294258 \ -pgnout ncm-dbt-20260415-1815-004.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464433	ncm-dbt-05	578465	500	214 41 245	+125.38 ± 12.89	0 5 70 172 3	+288.06 ± 41.11	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 2612968554 \ -pgnout ncm-dbt-20260415-1815-003.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464432	ncm-dbt-02	584076	500	222 53 225	+122.24 ± 13.3	0 5 76 164 5	+273.0 ± 39.35	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 2821827420 \ -pgnout ncm-dbt-20260415-1815-002.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15
464431	ncm-dbt-03	586477	500	231 55 214	+127.76 ± 13.39	0 4 73 166 7	+285.49 ± 40.16	↓
cutechess-cli \ -rounds 266 \ -games 2 \ -concurrency 16 \ -srand 673520585 \ -pgnout ncm-dbt-20260415-1815-001.pgn \ -openings \ file=UHO_4060_v2.epd \ format=epd \ order=random \ -repeat \ -resign \ movecount=3 \ score=600 \ -draw \ movenumber=34 \ movecount=8 \ score=5 \ -each \ tc=30+0.3 \ timemargin=10000 \ proto=uci \ option.Hash=128 \ option.Threads=8 \ -engine \ name=20260415-1815 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=dev_build:5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa \ -engine \ name=sf15 \ cmd=docker \ arg=run \ arg=-i \ arg=--rm \ arg=--entrypoint=/engine \ arg=stockfish:15

Commit

Commit ID	5f3dcb92ee097f3f1c3656570c4d1a473e95e3aa
Author	J. Oster
Date	2026-04-15 18:15:36 UTC
Simplify stalemate detection in qsearch. Conditions for no pawn pushes, non-pawn material and last captured piece are already such restrictive that we don't need to artificially set checkers bitboard for legal move generation. Also moving the check for available pawn pushes at first place, as it should already filter about 90% of cases. Passed STC and LTC non-regression tests. LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 171232 W: 44202 L: 44131 D: 82899 Ptnml(0-2): 466, 18809, 47023, 18824, 494 https://tests.stockfishchess.org/tests/view/69d3623b61a12cebe17ededa LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 55662 W: 14424 L: 14247 D: 26991 Ptnml(0-2): 38, 5479, 16609, 5678, 27 https://tests.stockfishchess.org/tests/view/69d64cada07a818b0a25f95e And also neutral on 10k fixed games test with custom stalemate book. Elo: 0.24 ± 0.9 (95%) LOS: 69.9% Total: 10000 W: 4681 L: 4674 D: 645 Ptnml(0-2): 0, 87, 4819, 94, 0 nElo: 1.81 ± 6.8 (95%) PairsRatio: 1.08 https://tests.stockfishchess.org/tests/view/69d7e4183ca80bdf151d43b8 closes https://github.com/official-stockfish/Stockfish/pull/6715 Bench: 2984258