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Extend checks more in losing positions

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Passed both short TC:
LLR: 2.98 (-2.94,2.94) [-1.50,4.50]
Total: 3974 W: 860 L: 741 D: 2373

And long TC:
LLR: 2.96 (-2.94,2.94) [0.00,6.00]
Total: 16807 W: 2917 L: 2733 D: 11157

bench: 3767999
This commit is contained in:
Uri Blass 2013-09-10 08:37:23 +02:00 • committed by Marco Costalba
parent bebd6e16f6
commit 738c5595ad
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; ext = ONE_PLY;
else if (givesCheck && pos.see_sign(move) >= 0) else if (givesCheck && pos.see_sign(move) >= 0)
ext = ONE_PLY / 2; ext = inCheck || ss->staticEval < VALUE_ZERO ? ONE_PLY : ONE_PLY / 2;
// Singular extension search. If all moves but one fail low on a search of // 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 // (alpha-s, beta-s), and just one fails high on (alpha, beta), then that move