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CounterMove History Pruning Tweak

Browse source 
STC: (Yellow)
LLR: -2.96 (-2.94,2.94) [0.00,5.00]
Total: 40124 W: 8817 L: 8751 D: 22556
http://tests.stockfishchess.org/tests/view/5b5690180ebc5902bdb85c8a

LTC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 21599 W: 3811 L: 3599 D: 14189
http://tests.stockfishchess.org/tests/view/5b5757010ebc5902bdb86b1f

Closes https://github.com/official-stockfish/Stockfish/pull/1697

Bench:  4794161
This commit is contained in:
VoyagerOne 2018-07-25 07:49:35 -04:00 • committed by Stéphane Nicolet
parent bb56779cb6
commit 6e36860554
1 changed files with 2 additions and 1 deletions
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3
src/search.cpp
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@ -935,7 +935,8 @@ 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
if ( lmrDepth < 4
&& (lmrDepth < 3 || ((ss - 1)->statScore > 0 && !PvNode))
&& (*contHist[0])[movedPiece][to_sq(move)] < CounterMovePruneThreshold
&& (*contHist[1])[movedPiece][to_sq(move)] < CounterMovePruneThreshold)
continue;