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Simplify away a term in see pruning

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This change only sets the margin to 0 when depth <= 2 and margin <= 42 which
never has a difference, thus non-functional

Passed non-regression STC
LLR: 3.51 (-2.94,2.94) <-1.75,0.25>
Total: 306976 W: 78935 L: 78961 D: 149080
Ptnml(0-2): 630, 34097, 84067, 34057, 637
https://tests.stockfishchess.org/tests/view/68708015fa93cf16d3bb2782

closes https://github.com/official-stockfish/Stockfish/pull/6170

No functional change
This commit is contained in:
Daniel Monroe
2025-07-24 10:32:41 +02:00
committed by Joost VandeVondele
parent e88ccfd835
commit 92514fd3a2
1 changed files with 2 additions and 2 deletions
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src/search.cpp
+2 -2
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@@ -1047,8 +1047,8 @@ moves_loop: // When in check, search starts here
}
// SEE based pruning for captures and checks
int seeHist = std::clamp(captHist / 31, -137 * depth, 125 * depth);
if (!pos.see_ge(move, -158 * depth - seeHist))
int margin = std::clamp(158 * depth + captHist / 31, 0, 283 * depth);
if (!pos.see_ge(move, -margin))
{
bool mayStalemateTrap =
depth > 2 && alpha < 0 && pos.non_pawn_material(us) == PieceValue[movedPiece]