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Simplify futility pruning

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Passed non regression STC:
https://tests.stockfishchess.org/tests/view/693e642c46f342e1ec20f68d
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 107968 W: 28080 L: 27937 D: 51951
Ptnml(0-2): 381, 12708, 27626, 12925, 344

Passed non regression LTC:
https://tests.stockfishchess.org/tests/view/693ff10c46f342e1ec20fa6a
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 334266 W: 85271 L: 85370 D: 163625
Ptnml(0-2): 179, 36395, 94086, 36292, 181

closes https://github.com/official-stockfish/Stockfish/pull/6484

Bench: 2987379
This commit is contained in:
AliceRoselia
2025-12-21 15:43:32 +01:00
committed by Disservin
parent 495296fc76
commit c467fe5ba4
1 changed files with 2 additions and 3 deletions
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src/search.cpp
+2 -3
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@@ -868,9 +868,8 @@ Value Search::Worker::search(
auto futility_margin = [&](Depth d) {
Value futilityMult = 76 - 23 * !ss->ttHit;
return futilityMult * d //
- 2474 * improving * futilityMult / 1024 //
- 331 * opponentWorsening * futilityMult / 1024 //
return futilityMult * d
- (2474 * improving + 331 * opponentWorsening) * futilityMult / 1024 //
+ std::abs(correctionValue) / 174665;
};