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Remove full depth search reduction when cutNode

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Passed STC-simplification bounds:
https://tests.stockfishchess.org/tests/view/6829dd6d6ec7634154f99fd3
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 67872 W: 17629 L: 17443 D: 32800
Ptnml(0-2): 167, 7988, 17451, 8152, 178

Passed LTC-simplification bounds:
https://tests.stockfishchess.org/tests/view/6829f2176ec7634154f9a01c
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 94818 W: 24328 L: 24184 D: 46306
Ptnml(0-2): 52, 10246, 26667, 10394, 50

closes https://github.com/official-stockfish/Stockfish/pull/6074

bench: 2245168
This commit is contained in:
Daniel Samek
2025-05-19 10:12:50 +02:00
committed by Joost VandeVondele
parent 0f102f3692
commit ccfa651968
1 changed files with 0 additions and 3 deletions
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3
src/search.cpp
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@@ -1292,9 +1292,6 @@ moves_loop: // When in check, search starts here
r -= ttMoveHistory / 8; r -= ttMoveHistory / 8;
if (cutNode)
r += 520;
// Note that if expected reduction is high, we reduce search depth here // Note that if expected reduction is high, we reduce search depth here
value = -search<NonPV>(pos, ss + 1, -(alpha + 1), -alpha, value = -search<NonPV>(pos, ss + 1, -(alpha + 1), -alpha,
newDepth - (r > 3564) - (r > 4969 && newDepth > 2), !cutNode); newDepth - (r > 3564) - (r > 4969 && newDepth > 2), !cutNode);