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More extensions if SE search is very low.

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More extensions for non-PV nodes if value from singular extension search is significantly below singularBeta.

Passed STC:
LLR: 2.97 (-2.94,2.94) <-0.50,2.50>
Total: 25064 W: 2334 L: 2162 D: 20568
Ptnml(0-2): 82, 1720, 8768, 1868, 94
https://tests.stockfishchess.org/tests/view/6084ba7995e7f1852abd27e3

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,3.50>
Total: 67136 W: 2644 L: 2450 D: 62042
Ptnml(0-2): 46, 2134, 28990, 2376, 22
https://tests.stockfishchess.org/tests/view/6084d79195e7f1852abd27ee

closes https://github.com/official-stockfish/Stockfish/pull/3445

Bench: 4075325
This commit is contained in:
lonfom169 2021-04-24 21:37:47 -03:00 • committed by Joost VandeVondele
parent c0ff241464
commit 33a858eaa1
1 changed files with 2 additions and 0 deletions
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2
src/search.cpp
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@ -1130,6 +1130,8 @@ moves_loop: // When in check, search starts from here
{
extension = 1;
singularQuietLMR = !ttCapture;
if (!PvNode && value < singularBeta - 140)
extension = 2;
}
// Multi-cut pruning