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Simplify static exchange evaluation pruning formula

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Passed STC: https://tests.stockfishchess.org/tests/view/666bda31602682471b064e1f
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 141696 W: 36932 L: 36826 D: 67938
Ptnml(0-2): 510, 16880, 35989, 16932, 537

Passed LTC: https://tests.stockfishchess.org/tests/view/666e6b67602682471b064f4b
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 159504 W: 40552 L: 40471 D: 78481
Ptnml(0-2): 130, 18160, 43103, 18217, 142

closes https://github.com/official-stockfish/Stockfish/pull/5400

bench: 1084115
This commit is contained in:
evqsx 2024-06-16 12:34:24 +08:00 • committed by Joost VandeVondele
parent 5514690f8e
commit 8806a58ebf
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -1586,7 +1586,7 @@ Value Search::Worker::qsearch(Position& pos, Stack* ss, Value alpha, Value beta,
// If static exchange evaluation is much worse than what is needed to not
// fall below alpha we can prune this move.
if (futilityBase > alpha && !pos.see_ge(move, (alpha - futilityBase) * 2 - 30))
if (futilityBase > alpha && !pos.see_ge(move, (alpha - futilityBase) * 4))
{
bestValue = alpha;
continue;