Dev Builds » 20190714-1240

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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 a0360cc2d4397edaad590cdf131fef95915b55c0
Author 31m059
Date 2019-07-14 12:40:45 UTC
Linear formula for w. Bench: 3328507 (#2239) In Stockfish, both the middlegame and endgame bonus for a passed pawn are calculated as a product of two factors. The first is k, chosen based on the presence of defended and unsafe squares. The second is w, a quadratic function of the pawn's rank. Both are only applied if the pawn's relative rank is at least RANK_4. It does not appear that the complexity of a quadratic function is necessary for w. Here, we replace it with a simpler linear one, which performs equally at both STC and LTC. STC: LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 46814 W: 10386 L: 10314 D: 26114 LTC: LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 82372 W: 13845 L: 13823 D: 54704 Bench: 3328507
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