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Simplify reduction condition for cutNodes

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LMR: for cutNodes, dont exclude killer moves. This was a prelude to reducing
allNodes, altho that's failed so far.

STC https://tests.stockfishchess.org/tests/view/62d64ad147ae1768b34a27c3
LLR: 2.95 (-2.94,2.94) <-2.25,0.25>
Total: 37064 W: 10044 L: 9889 D: 17131
Ptnml(0-2): 162, 4115, 9828, 4260, 167

LTC https://tests.stockfishchess.org/tests/view/62d66cc047ae1768b34a2b14
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 39832 W: 10796 L: 10659 D: 18377
Ptnml(0-2): 69, 3969, 11706, 4100, 72

closes https://github.com/official-stockfish/Stockfish/pull/4109

bench: 5697891
This commit is contained in:
Dubslow 2022-07-19 01:09:30 -05:00 • committed by Stéphane Nicolet
parent 4b4b7d1209
commit c4a644922d
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -1156,7 +1156,7 @@ moves_loop: // When in check, search starts here
r--; r--;
// Increase reduction for cut nodes (~3 Elo) // Increase reduction for cut nodes (~3 Elo)
if (cutNode && move != ss->killers[0]) if (cutNode)
r += 2; r += 2;
// Increase reduction if ttMove is a capture (~3 Elo) // Increase reduction if ttMove is a capture (~3 Elo)