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Reduce negative quiets by ONE_PLY / 2 

Passed both short TC:
LLR: 2.96 (-2.94,2.94) [-1.50,4.50]
Total: 3402 W: 708 L: 593 D: 2101

And long TC:
LLR: 2.93 (-2.94,2.94) [0.00,6.00]
Total: 23379 W: 3972 L: 3759 D: 15648

bench: 3529630
sf_dd_base
Ralph Stößer 2013-09-23 08:03:12 +02:00 committed by Marco Costalba
parent 84906b83ec
commit d7f5f15d69
1 changed files with 4 additions and 1 deletions
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5
src/search.cpp
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@ -949,8 +949,11 @@ moves_loop: // When in check and at SpNode search starts from here
if (!PvNode && cutNode)
ss->reduction += ONE_PLY;
else if (History[pos.piece_on(to_sq(move))][to_sq(move)] < 0)
ss->reduction += ONE_PLY / 2;
if (move == countermoves[0] || move == countermoves[1])
ss->reduction = std::max(DEPTH_ZERO, ss->reduction-ONE_PLY);
ss->reduction = std::max(DEPTH_ZERO, ss->reduction - ONE_PLY);
Depth d = std::max(newDepth - ss->reduction, ONE_PLY);
if (SpNode)