Dev Builds » 20180327-1514

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NCM plays each Stockfish dev build 20,000 times against Stockfish 14. This yields an approximate Elo difference and establishes confidence in the strength of the dev builds.


Host Duration Avg Base NPS Games WLD Standard Elo Ptnml(0-2) Gamepair Elo

Test Detail

ID Host Base NPS Games WLD Standard Elo Ptnml(0-2) Gamepair Elo CLI PGN


Commit ID 367304e930e967d90523025b34f25c2a9b60de8f
Author Ondrej Mosnáček
Date 2018-03-27 15:14:55 UTC
Fix dynamic contempt for MultiPV Use rootMoves[PVIdx].previousScore instead of bestValue for dynamic contempt. This is equivalent for MultiPV=1 (bench remained the same, even for higher depths), but more correct for MultiPV. STC (MultiPV=3): LLR: 2.95 (-2.94,2.94) [0.00,5.00] Total: 2657 W: 1079 L: 898 D: 680 LTC (MultiPV=3): LLR: 2.95 (-2.94,2.94) [0.00,5.00] Total: 2390 W: 874 L: 706 D: 810 VLTC 240+2.4 (MultiPV=3): LLR: 2.96 (-2.94,2.94) [0.00,5.00] Total: 2399 W: 861 L: 694 D: 844 LTC (MultiPV=4, Skill Level=17): LLR: 2.95 (-2.94,2.94) [0.00,5.00] Total: 747 W: 333 L: 175 D: 239 Note: although the ELO differences seem huge, they are inflated by the nature of Skill Level / MultiPV search, so I don't think they can be reasonably compared with classic ELO strength. See for some verifications searches with MultiPV = 10 at depths 12 and 24 from the starting position and the position after 1.e4, comparing the outputs of the full PV by the old master and by this patch. No functional change for MultiPV=1
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