Dev Builds » 20180829-0049

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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

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


Commit ID e846a9306d6108fb24cb216689867777ac2b0c4f
Author protonspring
Date 2018-08-29 00:49:10 UTC
Remove PawnsOnBothFlanks It looks like PawnsOnBothFlanks can be removed from initiative(). A barrage of tests seem to confirm that the adjustment to -110 does not gain elo to offset any potential loss by removing PawnsOnBothFlanks. STC LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 22014 W: 4760 L: 4639 D: 12615 LTC LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 40561 W: 6667 L: 6577 D: 27317 The barrage of 0,4 tests on the -136 value are in my ps_tunetests branch. Closes Bench: 4413173 ------------- How to continue from there? The fact that endgames with all the pawns on only one flank are drawish is a well-known chess idea, so it seems quite strange that this can be removed so easily without losing Elo. In the past there had been attempts to improve on PawnsOnBothFlanks with similar concepts (for instance using the pawn span value), but the tests were at best neutral. Maybe Stockfish is now mature enough that these refined ideas would work to replace PawnsOnBothFlanks?
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