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Extend captures and promotions

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This patch introduces extension for captures and promotions. Every capture or
promotion that is not the first move in the list gets extended at PvNodes and
cutNodes. Special thanks to @locutus2 - all my previous attepmts that failed
on this idea were done only for PvNodes - idea to include also cutNodes was
based on his latest passed patch.

STC
https://tests.stockfishchess.org/tests/view/6134abf325b9b35584838574
LLR: 2.95 (-2.94,2.94) <-0.50,2.50>
Total: 188920 W: 47754 L: 47304 D: 93862
Ptnml(0-2): 595, 21754, 49344, 22140, 627

LTC
https://tests.stockfishchess.org/tests/view/613521de25b9b355848385d7
LLR: 2.93 (-2.94,2.94) <0.50,3.50>
Total: 8768 W: 2283 L: 2098 D: 4387
Ptnml(0-2): 7, 866, 2452, 1053, 6

closes https://github.com/official-stockfish/Stockfish/pull/3692

bench: 5564555
This commit is contained in:
Michael Chaly 2021-09-06 00:17:46 +03:00 • committed by Stéphane Nicolet
parent 2807dcfab6
commit e404a7d97c
1 changed files with 8 additions and 0 deletions
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8
src/search.cpp
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@ -1094,6 +1094,14 @@ moves_loop: // When in check, search starts here
return beta;
}
}
// Capture extensions for PvNodes and cutNodes
else if ( (PvNode || cutNode)
&& captureOrPromotion
&& moveCount != 1)
extension = 1;
// Check extensions
else if ( givesCheck
&& depth > 6
&& abs(ss->staticEval) > Value(100))