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Reduce more CUT nodes

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We got a good result from this tweak, in line with
what was already found by Don Dailey.

At short TC:
LLR: 2.95 (-2.94,2.94)
Total: 13097 W: 2742 L: 2598 D: 7757

At long TC:
LLR: 2.97 (-2.94,2.94)
Total: 7281 W: 1408 L: 1265 D: 4608

bench: 5108393
This commit is contained in:
Marco Costalba 2013-06-13 19:50:32 +02:00
parent 3b8f66f8ac
commit 4bebb15e94
1 changed files with 4 additions and 0 deletions
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4
src/search.cpp
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@ -948,6 +948,10 @@ split_point_start: // At split points actual search starts from here
&& move != ss->killers[1])
{
ss->reduction = reduction<PvNode>(depth, moveCount);
if (!PvNode && cutNode)
ss->reduction += ONE_PLY;
if (move == countermoves[0] || move == countermoves[1])
ss->reduction = std::max(DEPTH_ZERO, ss->reduction-ONE_PLY);