Dev Builds » 20180226-0006

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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 7a03450bd9a0e2b3d596bb0654add4402041957a
Author Stéphane Nicolet
Date 2018-02-26 00:06:45 UTC
Count passed pawns in asymmetry measure The previous asymmetry measure of the pawn structure only used to consider the number of pawns on semi-opened files in the position. With this patch we also increase the measure by the number of passed pawns for both players. Many thanks to the community for the nice feedback on the previous version, with special mentions to Alain Savard and Marco Costalba for clarity and speed suggestions. STC: LLR: 2.96 (-2.94,2.94) [0.00,5.00] Total: 13146 W: 3038 L: 2840 D: 7268 LTC: LLR: 2.96 (-2.94,2.94) [0.00,5.00] Total: 27776 W: 4771 L: 4536 D: 18469 How to continue after this patch? Stockfish will now evaluate more positions with passed pawns, so tuning the passed pawns values may bring Elo. The patch has also consequences on the initiative term, where we might want to give different weights to passed pawns and semi-openfiles (idea by Stefano Cardanobile). Bench: 5302866
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