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
&& 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;