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Code Issues Releases Wiki Activity

Clean up depth reduction calculation

Browse source 
Might also be a slight speed up

No functional change

Resolves #593
This commit is contained in:
ElbertoOne 2016-02-28 13:40:47 +00:00 • committed by Joona Kiiski
parent 8de29390f2
commit c13052f344
1 changed files with 4 additions and 4 deletions
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8
src/search.cpp
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@ -1011,16 +1011,16 @@ moves_loop: // When in check search starts from here
&& !captureOrPromotion) && !captureOrPromotion)
{ {
Depth r = reduction<PvNode>(improving, depth, moveCount); Depth r = reduction<PvNode>(improving, depth, moveCount);
Value hValue = thisThread->history[pos.piece_on(to_sq(move))][to_sq(move)];
Value cmhValue = cmh[pos.piece_on(to_sq(move))][to_sq(move)];
// Increase reduction for cut nodes and moves with a bad history // Increase reduction for cut nodes and moves with a bad history
if ( (!PvNode && cutNode) if ( (!PvNode && cutNode)
|| ( thisThread->history[pos.piece_on(to_sq(move))][to_sq(move)] < VALUE_ZERO || (hValue < VALUE_ZERO && cmhValue <= VALUE_ZERO))
&& cmh[pos.piece_on(to_sq(move))][to_sq(move)] <= VALUE_ZERO))
r += ONE_PLY; r += ONE_PLY;
// Decrease/increase reduction for moves with a good/bad history // Decrease/increase reduction for moves with a good/bad history
int rHist = ( thisThread->history[pos.piece_on(to_sq(move))][to_sq(move)] int rHist = (hValue + cmhValue) / 14980;
+ cmh[pos.piece_on(to_sq(move))][to_sq(move)]) / 14980;
r = std::max(DEPTH_ZERO, r - rHist * ONE_PLY); r = std::max(DEPTH_ZERO, r - rHist * ONE_PLY);
// Decrease reduction for moves that escape a capture. Filter out // Decrease reduction for moves that escape a capture. Filter out