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Simplify corrections in extension margins

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Passed simplification STC
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 96192 W: 25002 L: 24852 D: 46338
Ptnml(0-2): 242, 10868, 25716, 11038, 232
https://tests.stockfishchess.org/tests/view/683b44cb6ec7634154f9d6ac

Passed simplification LTC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 83334 W: 21473 L: 21317 D: 40544
Ptnml(0-2): 37, 8877, 23674, 9051, 28
https://tests.stockfishchess.org/tests/view/683b79786ec7634154f9d75a

closes https://github.com/official-stockfish/Stockfish/pull/6117

Bench: 2294814
This commit is contained in:
Daniel Monroe
2025-05-31 11:04:42 -07:00
committed by Joost VandeVondele
parent 259bdaaa9f
commit 254b6d5e85
1 changed files with 4 additions and 5 deletions
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9
src/search.cpp
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@@ -1131,13 +1131,12 @@ moves_loop: // When in check, search starts here
if (value < singularBeta)
{
int corrValAdj1 = std::abs(correctionValue) / 248400;
int corrValAdj2 = std::abs(correctionValue) / 249757;
int doubleMargin = -4 + 244 * PvNode - 206 * !ttCapture - corrValAdj1
int corrValAdj = std::abs(correctionValue) / 248400;
int doubleMargin = -4 + 244 * PvNode - 206 * !ttCapture - corrValAdj
- 997 * ttMoveHistory / 131072
- (ss->ply > thisThread->rootDepth) * 47;
int tripleMargin = 84 + 269 * PvNode - 253 * !ttCapture + 91 * ss->ttPv
- corrValAdj2 - (ss->ply * 2 > thisThread->rootDepth * 3) * 54;
int tripleMargin = 84 + 269 * PvNode - 253 * !ttCapture + 91 * ss->ttPv - corrValAdj
- (ss->ply * 2 > thisThread->rootDepth * 3) * 54;
extension =
1 + (value < singularBeta - doubleMargin) + (value < singularBeta - tripleMargin);