Dev Builds » 20200123-1803

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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 18fc21eba0368fd5e3c4c4b8ee1000c9ac445425
Author Vizvezdenec
Date 2020-01-23 18:03:25 UTC
Tweak trapped rook penalty This patch greatly increases the endgame penalty for having a trapped rook. Idea was a result of witnessing Stockfish losing some games at CCCC exchanging pieces in the position with a trapped rook which directly lead to a lost endgame. This patch should partially fix such behavior making this penalty high even in deep endgames. Passed STC LLR: 2.94 (-2.94,2.94) {-1.00,3.00} Total: 8528 W: 1706 L: 1588 D: 5234 Ptnml(0-2): 133, 957, 1985, 1024, 159 Passed LTC LLR: 2.95 (-2.94,2.94) {0.00,2.00} Total: 88713 W: 11520 L: 11130 D: 66063 Ptnml(0-2): 646, 8170, 26342, 8492, 676 Closes Bench: 4964462 ---------------------- Comment by Malcolm Campbell: Congrats! I think this might be a common pattern - scores that seem to mainly apply to the midgame are often better with a similar (or at least fairly big) endgame value as well. Maybe there are others eval parameters we can tweak like this...
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