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Tweak CMH pruning

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STC: (yellow)
LLR: -2.94 (-2.94,2.94) [0.00,5.00]
Total: 48919 W: 10625 L: 10517 D: 27777
http://tests.stockfishchess.org/tests/view/5c07e6a20ebc5902bcee7395

LTC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 50360 W: 8424 L: 8102 D: 33834
http://tests.stockfishchess.org/tests/view/5c0812450ebc5902bcee76f4

Bench: 3775064
This commit is contained in:
VoyagerOne 2018-12-06 18:14:34 -05:00 • committed by Stéphane Nicolet
parent 4e2e4759a1
commit e8ffca3eb4
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -973,7 +973,7 @@ moves_loop: // When in check, search starts from here
int lmrDepth = std::max(newDepth - reduction<PvNode>(improving, depth, moveCount), DEPTH_ZERO) / ONE_PLY;
// Countermoves based pruning (~20 Elo)
if ( lmrDepth < 3 + ((ss-1)->statScore > 0)
if ( lmrDepth < 3 + ((ss-1)->statScore > 0 || (ss-1)->moveCount == 1)
&& (*contHist[0])[movedPiece][to_sq(move)] < CounterMovePruneThreshold
&& (*contHist[1])[movedPiece][to_sq(move)] < CounterMovePruneThreshold)
continue;