Increase reduction in case of multiple moves exceeding alpha. #3736
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Merged via c8459b1, congrats :-) |
vondele
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Dec 1, 2021
The reduction introduced in official-stockfish#3736 also consider on rootNode, so we don't have to reduce again. STC: LLR: 2.94 (-2.94,2.94) <-2.25,0.25> Total: 28736 W: 7494 L: 7329 D: 13913 Ptnml(0-2): 95, 3247, 7503, 3444, 79 https://tests.stockfishchess.org/tests/view/61a3abe01b7fdf52228e74d8 LTC: LLR: 2.94 (-2.94,2.94) <-2.25,0.25> Total: 47816 W: 12434 L: 12308 D: 23074 Ptnml(0-2): 37, 4972, 13755, 5116, 28 https://tests.stockfishchess.org/tests/view/61a3c3e39f0c43dae1c71d71 closes official-stockfish#3817 bench: 6331638
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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
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
Ptnml(0-2): 38, 6573, 20725, 6885, 47
Idea of this patch is the following - in case we already have 4 moves that exceeded alpha in current position probability of finding 5th should be reasonably low.
Number 4 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.
bench 6131513