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Less penalty for quiet late moves that didn't beat the best move.

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This moves since they are late in move ordering probably already have pretty bad stats anyway.
Passed STC:
https://tests.stockfishchess.org/tests/view/6943bcd546f342e1ec210e25
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 96704 W: 25206 L: 24798 D: 46700
Ptnml(0-2): 357, 11244, 24767, 11602, 382
Passed LTC:
https://tests.stockfishchess.org/tests/view/6946a8723c8768ca450722f0
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 89814 W: 23193 L: 22770 D: 43851
Ptnml(0-2): 53, 9532, 25321, 9941, 60
bench 2717363

closes https://github.com/official-stockfish/Stockfish/pull/6485

Bench: 2791988
This commit is contained in:
Michael Chaly
2025-12-23 21:42:45 +01:00
committed by Disservin
parent 1a67ccc72e
commit 447f66acac
1 changed files with 8 additions and 1 deletions
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src/search.cpp
+8 -1
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@@ -1831,9 +1831,16 @@ void update_all_stats(const Position& pos,
{
update_quiet_histories(pos, ss, workerThread, bestMove, bonus * 910 / 1024);
int i = 0;
// Decrease stats for all non-best quiet moves
for (Move move : quietsSearched)
update_quiet_histories(pos, ss, workerThread, move, -malus * 1085 / 1024);
{
i++;
int actualMalus = malus * 1085 / 1024;
if (i > 5)
actualMalus -= actualMalus * (i - 5) / i;
update_quiet_histories(pos, ss, workerThread, move, -actualMalus);
}
}
else
{