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Futile pruning simplification

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Remove CMH conditions in futile pruning.

STC:
LLR: 2.94 (-2.94,2.94) <-2.50,0.50>
Total: 93520 W: 7165 L: 7138 D: 79217
Ptnml(0-2): 222, 5923, 34427, 5982, 206
https://tests.stockfishchess.org/tests/view/61083104e50a153c346ef8df

LTC:
LLR: 2.93 (-2.94,2.94) <-2.50,0.50>
Total: 59072 W: 1746 L: 1706 D: 55620
Ptnml(0-2): 13, 1562, 26353, 1588, 20
https://tests.stockfishchess.org/tests/view/610894f2e50a153c346ef913

closes https://github.com/official-stockfish/Stockfish/pull/3638

Bench: 5229673
This commit is contained in:
VoyagerOne 2021-08-02 13:52:48 -04:00 • committed by Joost VandeVondele
parent a0fca67da4
commit 31ebd918ea
1 changed files with 1 additions and 5 deletions
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6
src/search.cpp
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@ -1023,11 +1023,7 @@ moves_loop: // When in check, search starts here
// Futility pruning: parent node (~5 Elo)
if ( !ss->inCheck
&& ss->staticEval + 174 + 157 * lmrDepth <= alpha
&& (*contHist[0])[movedPiece][to_sq(move)]
+ (*contHist[1])[movedPiece][to_sq(move)]
+ (*contHist[3])[movedPiece][to_sq(move)]
+ (*contHist[5])[movedPiece][to_sq(move)] / 3 < 28255)
&& ss->staticEval + 174 + 157 * lmrDepth <= alpha)
continue;
// Prune moves with negative SEE (~20 Elo)