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Simplify Away History Updates in Multicut

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Passed Non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 44896 W: 11600 L: 11388 D: 21908
Ptnml(0-2): 140, 5230, 11532, 5370, 176
https://tests.stockfishchess.org/tests/view/664cee31830eb9f886616a80

Passed Non-regression LTC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 56832 W: 14421 L: 14234 D: 28177
Ptnml(0-2): 37, 6251, 15643, 6458, 27
https://tests.stockfishchess.org/tests/view/664cfd4e830eb9f886616aa6

closes https://github.com/official-stockfish/Stockfish/pull/5281

Bench: 1119412
This commit is contained in:
Shawn Xu 2024-05-21 11:54:53 -07:00 • committed by Disservin
parent 1dcffa6210
commit c39b98b9e3
1 changed files with 0 additions and 5 deletions
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5
src/search.cpp
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@ -1083,12 +1083,7 @@ moves_loop: // When in check, search starts here
// we assume this expected cut-node is not singular (multiple moves fail high),
// and we can prune the whole subtree by returning a softbound.
else if (singularBeta >= beta)
{
if (!ttCapture)
update_quiet_histories(pos, ss, *this, ttMove, -stat_malus(depth));
return singularBeta;
}
// Negative extensions
// If other moves failed high over (ttValue - margin) without the ttMove on a reduced search,