Dev Builds » 20181119-0847

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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.


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Commit ID 2a7213f7205bfc9b8e6b91c1a1282f06aa3cd257
Author Vizvezdenec
Date 2018-11-19 08:47:19 UTC
Change default contempt from 21 to 24 centipawns To top the rating lists and get more interesting middle play, it is a good habit to set the default contempt to the highest value that does not regress against contempt=0. We recently decreased PawnValueEg it is logical that to raise a little bit the default higher contempt because of the following internal dependency in line 334 of search.cpp : ```` int ct = int(Options["Contempt"]) * PawnValueEg / 100; // From centipawns ```` STC: contempt=24 passed non-regression vs contempt=0 LTC: contempt=24 passed non-regression LTC vs contempt=0 On 2018-11-01, we also tested the effects of contempt=21 and contempt=24 against Stockfish 9, and the net result was neutral: Contempt 21 ELO: 51.68 +-1.9 (95%) LOS: 100.0% Total: 40000 W: 9487 L: 3581 D: 26932 Contempt 24 ELO: 52.21 +-2.0 (95%) LOS: 100.0% Total: 40000 W: 9759 L: 3793 D: 26448 Bench: 3459874
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