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Simplify static eval bonus

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Passed non-regression STC
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 176896 W: 45998 L: 45933 D: 84965
Ptnml(0-2): 609, 20845, 45451, 20958, 585
https://tests.stockfishchess.org/tests/view/68e5e48ba017f472e763dd21

Passed non-regression LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 77682 W: 20046 L: 19884 D: 37752
Ptnml(0-2): 41, 8404, 21786, 8572, 38
https://tests.stockfishchess.org/tests/view/68ee71e328e6d77fcff9fd68

closes https://github.com/official-stockfish/Stockfish/pull/6374

bench 2101654
This commit is contained in:
Daniel Monroe
2025-11-01 11:27:27 +01:00
committed by Joost VandeVondele
parent fd3c563f57
commit 013d42914f
1 changed files with 3 additions and 4 deletions
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src/search.cpp
+3 -4
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@@ -813,12 +813,11 @@ Value Search::Worker::search(
// Use static evaluation difference to improve quiet move ordering
if (((ss - 1)->currentMove).is_ok() && !(ss - 1)->inCheck && !priorCapture)
{
int bonus = std::clamp(-10 * int((ss - 1)->staticEval + ss->staticEval), -2023, 1563) + 583;
mainHistory[~us][((ss - 1)->currentMove).from_to()] << bonus * 944 / 1024;
int evalDiff = std::clamp(-int((ss - 1)->staticEval + ss->staticEval), -200, 156) + 58;
mainHistory[~us][((ss - 1)->currentMove).from_to()] << evalDiff * 9;
if (!ttHit && type_of(pos.piece_on(prevSq)) != PAWN
&& ((ss - 1)->currentMove).type_of() != PROMOTION)
pawnHistory[pawn_history_index(pos)][pos.piece_on(prevSq)][prevSq]
<< bonus * 1438 / 1024;
pawnHistory[pawn_history_index(pos)][pos.piece_on(prevSq)][prevSq] << evalDiff * 14;
}
// Set up the improving flag, which is true if current static evaluation is