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Extend checks more when below alpha

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Passed both short TC:
LLR: 2.97 (-2.94,2.94) [-1.50,4.50]
Total: 8739 W: 1830 L: 1698 D: 5211

And long TC:
LLR: 2.96 (-2.94,2.94) [0.00,6.00]
Total: 6716 W: 1238 L: 1101 D: 4377

bench: 4554576
This commit is contained in:
Marco Costalba 2013-09-11 09:22:57 +02:00
parent 738c5595ad
commit 4803d5772c
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -837,7 +837,7 @@ moves_loop: // When in check and at SpNode search starts from here
ext = ONE_PLY;
else if (givesCheck && pos.see_sign(move) >= 0)
ext = inCheck || ss->staticEval < VALUE_ZERO ? ONE_PLY : ONE_PLY / 2;
ext = inCheck || ss->staticEval <= alpha ? ONE_PLY : ONE_PLY / 2;
// Singular extension search. If all moves but one fail low on a search of
// (alpha-s, beta-s), and just one fails high on (alpha, beta), then that move