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Tweak late move extensions

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Allow late move extensions only for PV and cut nodes.

Passed STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 44512 W: 11688 L: 11355 D: 21469
Ptnml(0-2): 167, 5180, 11229, 5513, 167
https://tests.stockfishchess.org/tests/view/66c0509d4ff211be9d4ef10e

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 152970 W: 39026 L: 38466 D: 75478
Ptnml(0-2): 102, 16792, 42164, 17298, 129
https://tests.stockfishchess.org/tests/view/66c0994d21503a509c13b2b6

closes https://github.com/official-stockfish/Stockfish/pull/5541

bench: 1484730
This commit is contained in:
Taras Vuk 2024-08-18 16:11:06 +02:00 • committed by Joost VandeVondele
parent d275bf9643
commit 9fb58328e3
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -1163,7 +1163,7 @@ moves_loop: // When in check, search starts here
// beyond the first move depth.
// To prevent problems when the max value is less than the min value,
// std::clamp has been replaced by a more robust implementation.
Depth d = std::max(1, std::min(newDepth - r, newDepth + 1));
Depth d = std::max(1, std::min(newDepth - r, newDepth + (PvNode || cutNode)));
value = -search<NonPV>(pos, ss + 1, -(alpha + 1), -alpha, d, true);