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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
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AUTHORS
+1
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@@ -72,6 +72,7 @@ Ehsan Rashid (erashid)
Elvin Liu (solarlight2) Elvin Liu (solarlight2)
erbsenzaehler erbsenzaehler
Ernesto Gatti Ernesto Gatti
evqsx
Fabian Beuke (madnight) Fabian Beuke (madnight)
Fabian Fichter (ianfab) Fabian Fichter (ianfab)
Fanael Linithien (Fanael) Fanael Linithien (Fanael)
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 (nullValue >= beta && nullValue < VALUE_TB_WIN_IN_MAX_PLY)
{ {
if (thisThread->nmpMinPly || depth < 16) 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; return nullValue;
}
assert(!thisThread->nmpMinPly); // Recursive verification is not allowed assert(!thisThread->nmpMinPly); // Recursive verification is not allowed