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Streamlline reduction based on movecount

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Use MoveCount History only at quiet moves and simply reduce
reduction by one depth instead of increasing moveCount in formula.

STC:
LLR: 2.96 (-2.94,2.94) [0.00,4.00]
Total: 27511 W: 5171 L: 4919 D: 17421

LTC:
LLR: 2.96 (-2.94,2.94) [0.00,4.00]
Total: 92337 W: 12135 L: 11748 D: 68454

Bench: 6351176
This commit is contained in:
VoyagerOne 2017-09-04 16:27:22 -04:00 • committed by Marco Costalba
parent 741523eda8
commit 3ac47c84d3
1 changed files with 5 additions and 2 deletions
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7
src/search.cpp
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@ -947,13 +947,16 @@ moves_loop: // When in check search starts from here
&& moveCount > 1
&& (!captureOrPromotion || moveCountPruning))
{
int mch = std::max(1, moveCount - (ss-1)->moveCount / 16);
Depth r = reduction<PvNode>(improving, depth, mch);
Depth r = reduction<PvNode>(improving, depth, moveCount);
if (captureOrPromotion)
r -= r ? ONE_PLY : DEPTH_ZERO;
else
{
// Decrease reduction if opponent's move count is high
if ((ss-1)->moveCount > 15)
r -= ONE_PLY;
// Increase reduction if ttMove is a capture
if (ttCapture)
r += ONE_PLY;