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Simplify futilityBase formula

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This patch replaces std::min(ss->staticEval, bestValue) with ss->staticEval in the futilityBase formula.
Original idea by Vizvezdenec: https://tests.stockfishchess.org/tests/view/64ce66795b17f7c21c0d85f3

Passed STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 116928 W: 29925 L: 29793 D: 57210
Ptnml(0-2): 399, 13558, 30446, 13634, 427
https://tests.stockfishchess.org/tests/view/653285aade6d262d08d385dd

Passed LTC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 50868 W: 12947 L: 12757 D: 25164
Ptnml(0-2): 30, 5414, 14355, 5606, 29
https://tests.stockfishchess.org/tests/view/65336ffbde6d262d08d39ba0

closes https://github.com/official-stockfish/Stockfish/pull/4837

bench: 1241996
This commit is contained in:
Taras Vuk 2023-10-22 08:36:43 +02:00 • committed by Joost VandeVondele
parent 2d0237db3f
commit b7b7800e2b
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -1451,7 +1451,7 @@ Value qsearch(Position& pos, Stack* ss, Value alpha, Value beta, Depth depth) {
if (bestValue > alpha)
alpha = bestValue;
futilityBase = std::min(ss->staticEval, bestValue) + 200;
futilityBase = ss->staticEval + 200;
}
const PieceToHistory* contHist[] = {(ss - 1)->continuationHistory,