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Simplify cutnode depth condition

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With this patch, the depth condition for the cutnodes reduction is loosened from
tte->depth() >= depth + 3 to just tte->depth() >= depth.

Passed STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 101152 W: 25830 L: 25682 D: 49640
Ptnml(0-2): 312, 11788, 26258, 11876, 342
https://tests.stockfishchess.org/tests/view/64fd15635dab775b5359eaa6

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 82542 W: 20980 L: 20824 D: 40738
Ptnml(0-2): 42, 8795, 23440, 8953, 41
https://tests.stockfishchess.org/tests/view/64fda3545dab775b5359fbf1

closes https://github.com/official-stockfish/Stockfish/pull/4780

Bench: 1479029
This commit is contained in:
cj5716 2023-09-10 08:49:18 +08:00 • committed by Disservin
parent 46a5cedc11
commit 6d85f43e26
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -1131,7 +1131,7 @@ moves_loop: // When in check, search starts here
// Decrease further on cutNodes. (~1 Elo)
if ( ss->ttPv
&& !likelyFailLow)
r -= cutNode && tte->depth() >= depth + 3 ? 3 : 2;
r -= cutNode && tte->depth() >= depth ? 3 : 2;
// Decrease reduction if opponent's move count is high (~1 Elo)
if ((ss-1)->moveCount > 8)