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Remove the correction history bonus in null move search

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Passed STC:
https://tests.stockfishchess.org/tests/view/666168e191e372763104c664
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 94848 W: 24708 L: 24550 D: 45590
Ptnml(0-2): 289, 11355, 24033, 11403, 344

Passed LTC:
https://tests.stockfishchess.org/tests/view/6661e73591e372763104c751
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 70452 W: 17849 L: 17679 D: 34924
Ptnml(0-2): 27, 7707, 19596, 7861, 35

closes https://github.com/official-stockfish/Stockfish/pull/5375

Bench: 1174094
This commit is contained in:
evqsx
2024-06-06 15:43:55 +08:00
committed by Disservin
parent 1c67b46caf
commit 4151c06b74
2 changed files with 1 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/search.cpp
-9
View File
@@ -805,16 +805,7 @@ Value Search::Worker::search(
if (nullValue >= beta && nullValue < VALUE_TB_WIN_IN_MAX_PLY)
{
if (thisThread->nmpMinPly || depth < 16)
{
if (nullValue >= ss->staticEval)
{
auto bonus = std::min(int(nullValue - ss->staticEval) * depth / 32,
CORRECTION_HISTORY_LIMIT / 16);
thisThread->correctionHistory[us][pawn_structure_index<Correction>(pos)]
<< bonus;
}
return nullValue;
}
assert(!thisThread->nmpMinPly); // Recursive verification is not allowed