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Simplify away constants in statscore

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Passed simplification STC
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 317280 W: 81589 L: 81678 D: 154013
Ptnml(0-2): 799, 37651, 81847, 37526, 817
https://tests.stockfishchess.org/tests/view/684e197a703522d4f129c9f0

Passed simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 174816 W: 44656 L: 44593 D: 85567
Ptnml(0-2): 83, 19064, 49058, 19113, 90
https://tests.stockfishchess.org/tests/view/6858aa54a596a06817bb924f

closes https://github.com/official-stockfish/Stockfish/pull/6150

bench: 2508140
This commit is contained in:
Daniel Monroe
2025-07-24 09:56:36 +02:00
committed by Joost VandeVondele
parent 6a09a24cd8
commit a43f12ef08
1 changed files with 3 additions and 4 deletions
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src/search.cpp
+3 -4
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@@ -1192,7 +1192,7 @@ moves_loop: // When in check, search starts here
// These reduction adjustments have no proven non-linear scaling
r += 316; // Base reduction offset to compensate for other tweaks
r += 650; // Base reduction offset to compensate for other tweaks
r -= moveCount * 66;
r -= std::abs(correctionValue) / 28047;
@@ -1217,12 +1217,11 @@ moves_loop: // When in check, search starts here
if (capture)
ss->statScore =
826 * int(PieceValue[pos.captured_piece()]) / 128
+ thisThread->captureHistory[movedPiece][move.to_sq()][type_of(pos.captured_piece())]
- 5030;
+ thisThread->captureHistory[movedPiece][move.to_sq()][type_of(pos.captured_piece())];
else
ss->statScore = 2 * thisThread->mainHistory[us][move.from_to()]
+ (*contHist[0])[movedPiece][move.to_sq()]
+ (*contHist[1])[movedPiece][move.to_sq()] - 3206;
+ (*contHist[1])[movedPiece][move.to_sq()];
// Decrease/increase reduction for moves with a good/bad history
r -= ss->statScore * 826 / 8192;