Dev Builds » 20181227-2038

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


Commit ID 69dc5568b3bb9a02c71bdd5bb0e87135e892ea19
Author 31m059
Date 2018-12-27 20:38:31 UTC
Always initialize and evaluate king safety Recent tests by @xoto10, @Vizvezdenec, and myself seemed to hint that Elo could be gained by expanding the number of cases where king safety is applied. Several users (@Spliffjiffer, @Vizvezdenec) have anticipated benefits specifically in evaluation of tactics. It appears that we actually do not need to restrict the cases in which we initialize and evaluate king safety at all: initializing and evaluating it in every position appears roughly Elo-neutral at STC and possibly a substantial Elo gain at LTC. Any explanation for this scaling is, at this point, conjecture. Assuming it is not due to chance, my hypothesis is that initialization of king safety in all positions is a mild slowdown, offset by an Elo gain of evaluating king safety in all positions. At STC this produces Elo gains and losses that offset each other, while at longer time control the slowdown is much less important, leaving only the Elo gain. It probably helps SF to explore king attacks much earlier in search with high numbers of enemy pieces concentrating but not essentially attacking king ring. Thanks to @xoto10 and @Vizvezdenec for helping run my LTC! Closes STC: LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 35432 W: 7815 L: 7721 D: 19896 LTC: LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 12887 W: 2217 L: 2084 D: 8586 Bench: 3163951 ------------------ How to continue from there? * Next step will be to tune all the king danger terms once more after that :-)
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