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Simplify improving deduction in futility margin

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Passed non-regression STC:
https://tests.stockfishchess.org/tests/view/668981d4df142e108ffc9bb4
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 312672 W: 80280 L: 80363 D: 152029
Ptnml(0-2): 729, 37198, 80529, 37187, 693

Passed non-regression LTC:
https://tests.stockfishchess.org/tests/view/668988c6df142e108ffca042
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 126042 W: 31971 L: 31857 D: 62214
Ptnml(0-2): 50, 13988, 34832, 14100, 51

closes https://github.com/official-stockfish/Stockfish/pull/5454

bench 1100483
This commit is contained in:
Linmiao Xu 2024-07-06 13:41:11 -04:00 • committed by Joost VandeVondele
parent 2d3ef434b4
commit bb9b65408f
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -68,7 +68,7 @@ namespace {
// Futility margin // Futility margin
Value futility_margin(Depth d, bool noTtCutNode, bool improving, bool oppWorsening) { Value futility_margin(Depth d, bool noTtCutNode, bool improving, bool oppWorsening) {
Value futilityMult = 122 - 37 * noTtCutNode; Value futilityMult = 122 - 37 * noTtCutNode;
Value improvingDeduction = 58 * improving * futilityMult / 32; Value improvingDeduction = improving * futilityMult * 2;
Value worseningDeduction = oppWorsening * futilityMult / 3; Value worseningDeduction = oppWorsening * futilityMult / 3;
return futilityMult * d - improvingDeduction - worseningDeduction; return futilityMult * d - improvingDeduction - worseningDeduction;