Dev Builds » 20191118-0857

Use this dev build

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

Test Detail

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


Commit ID fe124896b241b4791454fd151da10101ad48f6d7
Author Joost VandeVondele
Date 2019-11-18 08:57:53 UTC
Use exploration rate for reductions This patch measures how frequently search is exploring new configurations. This is done be computing a running average of ttHit. The ttHitAverage rate is somewhat low (e.g. 30% for startpos) in the normal case, while it can be very high if no progress is made (e.g. 90% for the fortress I used for testing). This information can be used to influence search. In this patch, by adjusting reductions if the rate > 50%. A first version (using a low ttHitAverageResolution and this 50% threshold) passed testing: STC LLR: 2.96 (-2.94,2.94) [-1.50,4.50] Total: 26425 W: 5837 L: 5650 D: 14938 LTC LLR: 2.96 (-2.94,2.94) [0.00,3.50] Total: 32313 W: 5392 L: 5128 D: 21793 However, as discussed in pull request 2414, using a larger ttHitAverageResolution gives a better approximation of the underlying distributions. This needs a slight adjustment for the threshold as the new distributions are shifted a bit compared to the older ones, and this threshold seemingly is sensitive (we used 0.53125 here). This final version also passed testing, and is used for the patch: STC LLR: 2.95 (-2.94,2.94) [-1.50,4.50] Total: 16025 W: 3555 L: 3399 D: 9071 LTC LLR: 2.96 (-2.94,2.94) [0.00,3.50] Total: 37576 W: 6277 L: 5998 D: 25301 Closes Bench: 4989584
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