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Simplify a depth condition

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As the negative extension term has sensitive scaling, it would make more sense to allow more negative extension also at lower depth, and not just a region between low and high depth.

Passed STC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 124096 W: 31611 L: 31485 D: 61000
Ptnml(0-2): 422, 14437, 32205, 14561, 423
https://tests.stockfishchess.org/tests/view/64d205d75b17f7c21c0dea82

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 387882 W: 97840 L: 97993 D: 192049
Ptnml(0-2): 198, 42004, 109668, 41895, 176
https://tests.stockfishchess.org/tests/view/64d333f85b17f7c21c0e06c6

closes https://github.com/official-stockfish/Stockfish/pull/4743

Bench: 1542357
This commit is contained in:
cj5716 2023-08-08 17:06:31 +08:00 • committed by Disservin
parent d97a02ea2b
commit 222f3ea55b
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -1099,7 +1099,7 @@ moves_loop: // When in check, search starts here
// If we are on a cutNode, reduce it based on depth (negative extension) (~1 Elo)
else if (cutNode)
extension = depth > 8 && depth < 17 ? -3 : -1;
extension = depth < 17 ? -3 : -1;
// If the eval of ttMove is less than value, we reduce it (negative extension) (~1 Elo)
else if (ttValue <= value)