Chess engine: Stockfish 21100909 (Windows and Linux)

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Stockfish - UCI chess engine, compiled by Michael Chaly
Rating CEDR=3517

Timestamp: 1633766373
Reduce more if multiple moves exceed alpha

Idea of this patch is the following: in case we already have four moves that exceeded alpha in the current node, the probability of finding fifth should be reasonably low. Note that four is completely arbitrary - there could and probably should be some tweaks, both in tweaking best move count threshold for more reductions and tweaking how they work - for example making more reductions with best move count linearly.

passed STC:
https://tests.stockfishchess.org/tests/view/615f614783dd501a05b0aee2
LLR: 2.94 (-2.94,2.94) <-0.50,2.50>
Total: 141816 W: 36056 L: 35686 D: 70074 Elo +0.91
Ptnml(0-2): 499, 15131, 39273, 15511, 494

passed LTC:
https://tests.stockfishchess.org/tests/view/615fdff683dd501a05b0af35
LLR: 2.94 (-2.94,2.94) <0.50,3.50>
Total: 68536 W: 17221 L: 16891 D: 34424 Elo +1.67
Ptnml(0-2): 38, 6573, 20725, 6885, 47
Bench: 6131513

Stockfish 21100909 NNUE download

 

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