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Simplify Away Killer Condition in Cutnode LMR

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Passed Non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 42944 W: 11240 L: 11024 D: 20680
Ptnml(0-2): 159, 5056, 10825, 5274, 158
https://tests.stockfishchess.org/tests/view/669c13384ff211be9d4ec69f

Passed Non-regression LTC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 163548 W: 41366 L: 41289 D: 80893
Ptnml(0-2): 109, 18246, 45007, 18283, 129
https://tests.stockfishchess.org/tests/view/669cb1254ff211be9d4ec73a

closes https://github.com/official-stockfish/Stockfish/pull/5513

Bench: 1178570
This commit is contained in:
Shawn Xu 2024-07-20 12:41:56 -07:00 • committed by Disservin
parent b55217fd02
commit 85893ac1cd
1 changed files with 1 additions and 2 deletions
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3
src/search.cpp
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@ -1131,8 +1131,7 @@ moves_loop: // When in check, search starts here
// Increase reduction for cut nodes (~4 Elo)
if (cutNode)
r += 2 - (ttData.depth >= depth && ss->ttPv)
+ (!ss->ttPv && move != ttData.move && move != ss->killer);
r += 2 - (ttData.depth >= depth && ss->ttPv) + (!ss->ttPv && move != ttData.move);
// Increase reduction if ttMove is a capture (~3 Elo)
if (ttCapture)