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Simplify malus decay formula

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Passed non-regression STC
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 93600 W: 24165 L: 24007 D: 45428
Ptnml(0-2): 325, 11021, 23958, 11163, 333
https://tests.stockfishchess.org/tests/view/698121d46362aee5c8a55414

Passed non-regression LTC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 83232 W: 21236 L: 21077 D: 40919
Ptnml(0-2): 46, 9147, 23083, 9282, 58
https://tests.stockfishchess.org/tests/view/698336dc473df9d1d24a90e8

closes https://github.com/official-stockfish/Stockfish/pull/6600

Bench: 2666284
This commit is contained in:
Daniel Monroe
2026-02-13 07:12:04 +01:00
committed by Joost VandeVondele
parent b808fd3d55
commit 89b4f457e0
1 changed files with 2 additions and 5 deletions
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src/search.cpp
+2 -5
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@@ -1837,14 +1837,11 @@ void update_all_stats(const Position& pos,
{
update_quiet_histories(pos, ss, workerThread, bestMove, bonus * 910 / 1024);
int i = 0;
int actualMalus = malus * 1100 / 1024;
// Decrease stats for all non-best quiet moves
for (Move move : quietsSearched)
{
i++;
int actualMalus = malus * 1085 / 1024;
if (i > 5)
actualMalus -= actualMalus * (i - 5) / i;
actualMalus = actualMalus * 950 / 1024;
update_quiet_histories(pos, ss, workerThread, move, -actualMalus);
}
}