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Simplify captures PCM

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Passed Non-regression STC:
LLR: 2.92 (-2.94,2.94) <-1.75,0.25>
Total: 229856 W: 59258 L: 59252 D: 111346
Ptnml(0-2): 746, 27330, 58714, 27448, 690
https://tests.stockfishchess.org/tests/view/67d3fdac517865b4a2dfcef4

Passed Non-regression LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 107652 W: 27470 L: 27338 D: 52844
Ptnml(0-2): 56, 11646, 30280, 11798, 46
https://tests.stockfishchess.org/tests/view/67d5f972517865b4a2dfd2ec

closes https://github.com/official-stockfish/Stockfish/pull/5931

Bench: 1842520
This commit is contained in:
Shawn Xu
2025-03-14 02:21:48 -07:00
committed by Disservin
parent 8fc5e92005
commit 9045f17c3f
1 changed files with 3 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
src/search.cpp
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@@ -1442,7 +1442,7 @@ moves_loop: // When in check, search starts here
update_all_stats(pos, ss, *this, bestMove, prevSq, quietsSearched, capturesSearched, depth,
bestMove == ttData.move, moveCount);
// Bonus for prior countermove that caused the fail low
// Bonus for prior quiet countermove that caused the fail low
else if (!priorCapture && prevSq != SQ_NONE)
{
int bonusScale = (112 * (depth > 5) + 34 * !allNode + 164 * ((ss - 1)->moveCount > 8)
@@ -1466,13 +1466,12 @@ moves_loop: // When in check, search starts here
<< scaledBonus * 1055 / 32768;
}
// Bonus for prior capture countermove that caused the fail low
else if (priorCapture && prevSq != SQ_NONE)
{
// bonus for prior countermoves that caused the fail low
Piece capturedPiece = pos.captured_piece();
assert(capturedPiece != NO_PIECE);
thisThread->captureHistory[pos.piece_on(prevSq)][prevSq][type_of(capturedPiece)]
<< std::min(300 * depth - 182, 2995);
thisThread->captureHistory[pos.piece_on(prevSq)][prevSq][type_of(capturedPiece)] << 1100;
}
if (PvNode)