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Simplify tt depth in stat eval history adjustment

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Passed simplification STC
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 102208 W: 26498 L: 26349 D: 49361
Ptnml(0-2): 284, 12095, 26166, 12306, 253
https://tests.stockfishchess.org/tests/view/683354c76ec7634154f9be88

Passed simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 133422 W: 34050 L: 33945 D: 65427
Ptnml(0-2): 56, 14473, 37559, 14556, 67
https://tests.stockfishchess.org/tests/view/683363626ec7634154f9c298

closes https://github.com/official-stockfish/Stockfish/pull/6099

Bench: 2652411
This commit is contained in:
Daniel Monroe
2025-05-25 10:34:52 -07:00
committed by Joost VandeVondele
parent dfa176fc7e
commit 9fd40b9ea8
1 changed files with 1 additions and 2 deletions
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3
src/search.cpp
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@@ -807,8 +807,7 @@ Value Search::Worker::search(
}
// Use static evaluation difference to improve quiet move ordering
if (((ss - 1)->currentMove).is_ok() && !(ss - 1)->inCheck && !priorCapture
&& (ttData.depth - 2) <= depth)
if (((ss - 1)->currentMove).is_ok() && !(ss - 1)->inCheck && !priorCapture && ttData.depth <= 2)
{
int bonus = std::clamp(-10 * int((ss - 1)->staticEval + ss->staticEval), -1858, 1492) + 661;
thisThread->mainHistory[~us][((ss - 1)->currentMove).from_to()] << bonus * 1057 / 1024;