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Simplify Away Quadruple Extensions

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Passed Non-regression LTC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 95856 W: 24551 L: 24404 D: 46901
Ptnml(0-2): 85, 10621, 26364, 10778, 80
https://tests.stockfishchess.org/tests/view/679a9aedae346be6da0eebd6

Passed Non-regression VLTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 157536 W: 40000 L: 39921 D: 77615
Ptnml(0-2): 43, 16416, 45775, 16487, 47
https://tests.stockfishchess.org/tests/view/679aed8f51037ccaf3e30fbf

Passed Non-regression VVLTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 51598 W: 13345 L: 13172 D: 25081
Ptnml(0-2): 0, 4735, 16162, 4896, 6
https://tests.stockfishchess.org/tests/view/679d368b0774dfd78deb0163

closes https://github.com/official-stockfish/Stockfish/pull/5843

Bench: 2399312
This commit is contained in:
Shawn Xu
2025-01-29 13:04:01 -08:00
committed by Disservin
parent c83ddd9e4b
commit 344e89275a
1 changed files with 1 additions and 4 deletions
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5
src/search.cpp
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@@ -1097,12 +1097,9 @@ moves_loop: // When in check, search starts here
int doubleMargin = 249 * PvNode - 194 * !ttCapture - corrValAdj;
int tripleMargin =
94 + 287 * PvNode - 249 * !ttCapture + 99 * ss->ttPv - corrValAdj;
int quadMargin =
394 + 287 * PvNode - 249 * !ttCapture + 99 * ss->ttPv - corrValAdj;
extension = 1 + (value < singularBeta - doubleMargin)
+ (value < singularBeta - tripleMargin)
+ (value < singularBeta - quadMargin);
+ (value < singularBeta - tripleMargin);
depth += ((!PvNode) && (depth < 15));
}