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Change history reduction in LMR to be a full ply.

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STC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 9829 W: 2142 L: 1998 D: 5689

LTC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 27162 W: 4802 L: 4692 D: 17668

Bench: 7284120

Resolves #53
This commit is contained in:
Uri Blass 2014-09-26 02:22:39 +08:00 • committed by Gary Linscott
parent fed3e752ae
commit d6613b7589
1 changed files with 2 additions and 4 deletions
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6
src/search.cpp
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@ -823,12 +823,10 @@ moves_loop: // When in check and at SpNode search starts from here
{ {
ss->reduction = reduction<PvNode>(improving, depth, moveCount); ss->reduction = reduction<PvNode>(improving, depth, moveCount);
if (!PvNode && cutNode) if ( (!PvNode && cutNode)
|| History[pos.piece_on(to_sq(move))][to_sq(move)] < 0)
ss->reduction += ONE_PLY; 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]) 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);