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Tweak best move history updates.

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If not at an PV node, scale history bonus for the found best move up proportionally to the count of the other moves searched.

Passed STC:
LLR: 2.96 (-2.94,2.94) <0.00,2.00>
Total: 219712 W: 56104 L: 55525 D: 108083
Ptnml(0-2): 565, 25482, 57188, 26051, 570
https://tests.stockfishchess.org/tests/view/6a1306fb818cacc1db0ac5b7

Passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 53988 W: 13851 L: 13498 D: 26639
Ptnml(0-2): 22, 5779, 15051, 6108, 34
https://tests.stockfishchess.org/tests/view/6a1b557e818cacc1db0ad0b8

closes https://github.com/official-stockfish/Stockfish/pull/6871

Bench: 2935474
This commit is contained in:
Stefan Geschwentner
2026-06-06 10:05:50 +02:00
committed by Joost VandeVondele
parent 9eb836b3b5
commit 645b636dfa
1 changed files with 10 additions and 3 deletions
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src/search.cpp
+10 -3
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@@ -144,7 +144,8 @@ void update_all_stats(const Position& pos,
SearchedList& quietsSearched,
SearchedList& capturesSearched,
Depth depth,
Move ttMove);
Move ttMove,
bool PvNode);
bool is_shuffling(Move move, Stack* const ss, const Position& pos) {
if (pos.capture_stage(move) || pos.rule50_count() < 10)
@@ -1477,7 +1478,7 @@ moves_loop: // When in check, search starts here
else if (bestMove)
{
update_all_stats(pos, ss, *this, bestMove, prevSq, quietsSearched, capturesSearched, depth,
ttData.move);
ttData.move, PvNode);
if (!PvNode)
ttMoveHistory << (bestMove == ttData.move ? 792 : -779);
}
@@ -1871,7 +1872,8 @@ void update_all_stats(const Position& pos,
SearchedList& quietsSearched,
SearchedList& capturesSearched,
Depth depth,
Move ttMove) {
Move ttMove,
bool PvNode) {
CapturePieceToHistory& captureHistory = workerThread.captureHistory;
Piece movedPiece = pos.moved_piece(bestMove);
@@ -1881,6 +1883,11 @@ void update_all_stats(const Position& pos,
std::min(134 * depth - 79, 1572) + 382 * (bestMove == ttMove) + (ss - 1)->statScore / 30;
int malus = std::min(1005 * depth - 205, 2218);
if (!PvNode)
// Important: don't remove the cast to a 64-bit number else the multiplication
// can overflow on 32-bit platforms which would change the bench signature
bonus += bonus * uint64_t(quietsSearched.size() + capturesSearched.size()) / 256;
if (!pos.capture_stage(bestMove))
{
update_quiet_histories(pos, ss, workerThread, bestMove, bonus * 824 / 1024);