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Simplify malus formula

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Passed non-regression STC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 51936 W: 13490 L: 13283 D: 25163
Ptnml(0-2): 161, 6128, 13184, 6333, 162
https://tests.stockfishchess.org/tests/view/698120e06362aee5c8a55412

Passed non-regression LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 233772 W: 59502 L: 59499 D: 114771
Ptnml(0-2): 144, 25753, 65086, 25762, 141
https://tests.stockfishchess.org/tests/view/69827426889c3a4c31c8db52

closes https://github.com/official-stockfish/Stockfish/pull/6606

bench 2739355
This commit is contained in:
Daniel Monroe
2026-02-13 07:15:35 +01:00
committed by Joost VandeVondele
parent 89b4f457e0
commit 91c6ea82aa
1 changed files with 4 additions and 6 deletions
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src/search.cpp
+4 -6
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@@ -139,8 +139,7 @@ void update_all_stats(const Position& pos,
SearchedList& quietsSearched,
SearchedList& capturesSearched,
Depth depth,
Move TTMove,
int moveCount);
Move ttMove);
bool is_shuffling(Move move, Stack* const ss, const Position& pos) {
if (pos.capture_stage(move) || pos.rule50_count() < 10)
@@ -1414,7 +1413,7 @@ moves_loop: // When in check, search starts here
else if (bestMove)
{
update_all_stats(pos, ss, *this, bestMove, prevSq, quietsSearched, capturesSearched, depth,
ttData.move, moveCount);
ttData.move);
if (!PvNode)
ttMoveHistory << (bestMove == ttData.move ? 809 : -865);
}
@@ -1822,8 +1821,7 @@ void update_all_stats(const Position& pos,
SearchedList& quietsSearched,
SearchedList& capturesSearched,
Depth depth,
Move ttMove,
int moveCount) {
Move ttMove) {
CapturePieceToHistory& captureHistory = workerThread.captureHistory;
Piece movedPiece = pos.moved_piece(bestMove);
@@ -1831,7 +1829,7 @@ void update_all_stats(const Position& pos,
int bonus =
std::min(116 * depth - 81, 1515) + 347 * (bestMove == ttMove) + (ss - 1)->statScore / 32;
int malus = std::min(848 * depth - 207, 2446) - 17 * moveCount;
int malus = std::min(800 * depth - 207, 2200);
if (!pos.capture_stage(bestMove))
{