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Simplify futility pruning parent node

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only continuation histories seem needed for this purpose.

STC:
http://tests.stockfishchess.org/tests/view/5e6b88dfe42a5c3b3ca2e4ab
LLR: 2.94 (-2.94,2.94) {-1.50,0.50}
Total: 113356 W: 21725 L: 21696 D: 69935
Ptnml(0-2): 1999, 13255, 26163, 13240, 2021

LTC:
http://tests.stockfishchess.org/tests/view/5e6babbfe42a5c3b3ca2e4c2
LLR: 2.94 (-2.94,2.94) {-1.50,0.50}
Total: 22164 W: 2917 L: 2821 D: 16426
Ptnml(0-2): 173, 2040, 6548, 2160, 161

closes https://github.com/official-stockfish/Stockfish/pull/2583

bench: 4839496
This commit is contained in:
pb00067 2020-03-13 19:29:36 +01:00 • committed by Joost VandeVondele
parent 442e1e0f93
commit ec2002c594
1 changed files with 2 additions and 3 deletions
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5
src/search.cpp
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@ -1024,10 +1024,9 @@ moves_loop: // When in check, search starts from here
if ( lmrDepth < 6
&& !inCheck
&& ss->staticEval + 235 + 172 * lmrDepth <= alpha
&& thisThread->mainHistory[us][from_to(move)]
+ (*contHist[0])[movedPiece][to_sq(move)]
&& (*contHist[0])[movedPiece][to_sq(move)]
+ (*contHist[1])[movedPiece][to_sq(move)]
+ (*contHist[3])[movedPiece][to_sq(move)] < 25000)
+ (*contHist[3])[movedPiece][to_sq(move)] < 27400)
continue;
// Prune moves with negative SEE (~20 Elo)