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Simplify away cutoff term in prior countermove bonus

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Passed simplification STC
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 61120 W: 16010 L: 15819 D: 29291
Ptnml(0-2): 150, 7105, 15869, 7276, 160
https://tests.stockfishchess.org/tests/view/683560226ec7634154f9ce0f

Passed simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 225090 W: 57555 L: 57543 D: 109992
Ptnml(0-2): 104, 24367, 63603, 24355, 116
https://tests.stockfishchess.org/tests/view/6836420c6ec7634154f9cf5c

closes https://github.com/official-stockfish/Stockfish/pull/6111

Bench: 2472910
This commit is contained in:
Daniel Monroe
2025-05-26 23:47:35 -07:00
committed by Joost VandeVondele
parent ddefd6eb6b
commit 70ff5e3163
1 changed files with 1 additions and 2 deletions
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3
src/search.cpp
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@@ -1431,11 +1431,10 @@ moves_loop: // When in check, search starts here
// Bonus for prior quiet countermove that caused the fail low // Bonus for prior quiet countermove that caused the fail low
else if (!priorCapture && prevSq != SQ_NONE) else if (!priorCapture && prevSq != SQ_NONE)
{ {
int bonusScale = -302; int bonusScale = -220;
bonusScale += std::min(-(ss - 1)->statScore / 103, 323); bonusScale += std::min(-(ss - 1)->statScore / 103, 323);
bonusScale += std::min(73 * depth, 531); bonusScale += std::min(73 * depth, 531);
bonusScale += 174 * ((ss - 1)->moveCount > 8); bonusScale += 174 * ((ss - 1)->moveCount > 8);
bonusScale += 90 * (ss->cutoffCnt <= 3);
bonusScale += 144 * (!ss->inCheck && bestValue <= ss->staticEval - 104); bonusScale += 144 * (!ss->inCheck && bestValue <= ss->staticEval - 104);
bonusScale += 128 * (!(ss - 1)->inCheck && bestValue <= -(ss - 1)->staticEval - 82); bonusScale += 128 * (!(ss - 1)->inCheck && bestValue <= -(ss - 1)->staticEval - 82);