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Simplify allNode term in prior countermove

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Passed simplification STC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 53632 W: 14008 L: 13805 D: 25819
Ptnml(0-2): 136, 6253, 13869, 6388, 170
https://tests.stockfishchess.org/tests/view/6828f2b26ec7634154f99b5e

Passed simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 82482 W: 21202 L: 21045 D: 40235
Ptnml(0-2): 37, 8986, 23052, 9115, 51
https://tests.stockfishchess.org/tests/view/6829010a6ec7634154f99db3

closes https://github.com/official-stockfish/Stockfish/pull/6068

Bench: 2302782
This commit is contained in:
Daniel Monroe
2025-05-23 08:51:54 +02:00
committed by Joost VandeVondele
parent e03898b57c
commit 4f021cab3b
1 changed files with 2 additions and 3 deletions
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src/search.cpp
+2 -3
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@@ -1451,10 +1451,9 @@ 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 = -324; int bonusScale = -302;
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 += 33 * !allNode;
bonusScale += 174 * ((ss - 1)->moveCount > 8); bonusScale += 174 * ((ss - 1)->moveCount > 8);
bonusScale += 90 * (ss->cutoffCnt <= 3); bonusScale += 90 * (ss->cutoffCnt <= 3);
bonusScale += 144 * (!ss->inCheck && bestValue <= ss->staticEval - 104); bonusScale += 144 * (!ss->inCheck && bestValue <= ss->staticEval - 104);
@@ -2245,4 +2244,4 @@ bool RootMove::extract_ponder_from_tt(const TranspositionTable& tt, Position& po
} }
} // namespace Stockfish } // namespace Stockfish