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Remove second futility pruning depth limit

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This patch removes futility pruning lmrDepth limit for futility pruning at parent nodes.
Since it's already capped by margin that is a function of lmrDepth there is no need to extra cap it with lmrDepth.

passed STC
https://tests.stockfishchess.org/tests/view/60e9b5dfd1189bed71812777
LLR: 2.97 (-2.94,2.94) <-2.50,0.50>
Total: 14872 W: 1264 L: 1145 D: 12463
Ptnml(0-2): 37, 942, 5369, 1041, 47

passed LTC
https://tests.stockfishchess.org/tests/view/60e9c635d1189bed71812790
LLR: 2.96 (-2.94,2.94) <-2.50,0.50>
Total: 40336 W: 1280 L: 1225 D: 37831
Ptnml(0-2): 24, 1057, 17960, 1094, 33

closes https://github.com/official-stockfish/Stockfish/pull/3612

bench: 5064969
This commit is contained in:
Vizvezdenec 2021-07-11 00:09:15 +03:00 • committed by Joost VandeVondele
parent f4986f4596
commit dbd7f602d3
1 changed files with 1 additions and 2 deletions
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3
src/search.cpp
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@ -1021,8 +1021,7 @@ moves_loop: // When in check, search starts from here
continue; continue;
// Futility pruning: parent node (~5 Elo) // Futility pruning: parent node (~5 Elo)
if ( lmrDepth < 7 if ( !ss->inCheck
&& !ss->inCheck
&& ss->staticEval + 174 + 157 * lmrDepth <= alpha && ss->staticEval + 174 + 157 * lmrDepth <= alpha
&& (*contHist[0])[movedPiece][to_sq(move)] && (*contHist[0])[movedPiece][to_sq(move)]
+ (*contHist[1])[movedPiece][to_sq(move)] + (*contHist[1])[movedPiece][to_sq(move)]