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Simplify static evaluation difference to move ordering logic

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Passed STC simplification bounds
https://tests.stockfishchess.org/tests/view/686fcb091451bd6fb83082bc
LLR: 2.92 (-2.94,2.94) <-1.75,0.25>
Total: 762816 W: 196717 L: 197295 D: 368804
Ptnml(0-2): 2052, 90457, 196853, 90109, 1937

Passed LTC simplification bounds
https://tests.stockfishchess.org/tests/view/68808d316e17e7fa3939b35d
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 44736 W: 11499 L: 11303 D: 21934
Ptnml(0-2): 24, 4766, 12586, 4974, 18

closes https://github.com/official-stockfish/Stockfish/pull/6176

bench: 2684407
This commit is contained in:
pb00067
2025-07-28 19:40:15 +02:00
committed by Joost VandeVondele
parent b6082ba750
commit 402602a70d
1 changed files with 1 additions and 1 deletions
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src/search.cpp
+1 -1
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@@ -808,7 +808,7 @@ Value Search::Worker::search(
}
// Use static evaluation difference to improve quiet move ordering
if (((ss - 1)->currentMove).is_ok() && !(ss - 1)->inCheck && !priorCapture && !ttHit)
if (((ss - 1)->currentMove).is_ok() && !(ss - 1)->inCheck && !priorCapture)
{
int bonus = std::clamp(-10 * int((ss - 1)->staticEval + ss->staticEval), -1979, 1561) + 630;
mainHistory[~us][((ss - 1)->currentMove).from_to()] << bonus * 935 / 1024;