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Refactor prior countermove bonus

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Passed simplification STC
LLR: 2.97 (-2.94,2.94) <-1.75,0.25>
Total: 155424 W: 40252 L: 40159 D: 75013
Ptnml(0-2): 511, 18655, 39328, 18666, 552
https://tests.stockfishchess.org/tests/view/6794084fe96bfb672ad18d90

Passed rebased simplification LTC
LLR: 2.97 (-2.94,2.94) <-1.75,0.25>
Total: 103944 W: 26567 L: 26427 D: 50950
Ptnml(0-2): 69, 11640, 28418, 11772, 73
https://tests.stockfishchess.org/tests/view/67955c9a406a4efe9eb7d7e4

closes https://github.com/official-stockfish/Stockfish/pull/5825

Bench: 1839554
This commit is contained in:
Daniel Monroe
2025-01-25 13:49:47 -08:00
committed by Disservin
parent a016abd698
commit ebdc7ba2da
1 changed files with 6 additions and 8 deletions
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src/search.cpp
+6 -8
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@@ -1381,23 +1381,21 @@ moves_loop: // When in check, search starts here
int bonusScale = (118 * (depth > 5) + 37 * !allNode + 169 * ((ss - 1)->moveCount > 8) int bonusScale = (118 * (depth > 5) + 37 * !allNode + 169 * ((ss - 1)->moveCount > 8)
+ 128 * (!ss->inCheck && bestValue <= ss->staticEval - 102) + 128 * (!ss->inCheck && bestValue <= ss->staticEval - 102)
+ 115 * (!(ss - 1)->inCheck && bestValue <= -(ss - 1)->staticEval - 82) + 115 * (!(ss - 1)->inCheck && bestValue <= -(ss - 1)->staticEval - 82)
+ 80 * ((ss - 1)->isTTMove)); + 80 * ((ss - 1)->isTTMove) + std::min(-(ss - 1)->statScore / 106, 318));
// Proportional to "how much damage we have to undo"
bonusScale += std::min(-(ss - 1)->statScore / 106, 318);
bonusScale = std::max(bonusScale, 0); bonusScale = std::max(bonusScale, 0);
const int scaledBonus = stat_bonus(depth) * bonusScale / 32; const int scaledBonus = stat_bonus(depth) * bonusScale;
update_continuation_histories(ss - 1, pos.piece_on(prevSq), prevSq, update_continuation_histories(ss - 1, pos.piece_on(prevSq), prevSq,
scaledBonus * 436 / 1024); scaledBonus * 436 / 32768);
thisThread->mainHistory[~us][((ss - 1)->currentMove).from_to()] << scaledBonus * 207 / 1024; thisThread->mainHistory[~us][((ss - 1)->currentMove).from_to()]
<< scaledBonus * 207 / 32768;
if (type_of(pos.piece_on(prevSq)) != PAWN && ((ss - 1)->currentMove).type_of() != PROMOTION) if (type_of(pos.piece_on(prevSq)) != PAWN && ((ss - 1)->currentMove).type_of() != PROMOTION)
thisThread->pawnHistory[pawn_structure_index(pos)][pos.piece_on(prevSq)][prevSq] thisThread->pawnHistory[pawn_structure_index(pos)][pos.piece_on(prevSq)][prevSq]
<< scaledBonus * 1195 / 1024; << scaledBonus * 1195 / 32768;
} }
else if (priorCapture && prevSq != SQ_NONE) else if (priorCapture && prevSq != SQ_NONE)