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Do more futility pruning for parent nodes.

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This patch increases LMRdepth threshold for futility pruning at parent nodes so it can apply more often.
With radical change to evaluation approach it seems that search is really far from optimal state, especially it parts that use static evaluation of position.

passed STC
https://tests.stockfishchess.org/tests/view/5f2da75661e3b6af64881fd0
LLR: 2.93 (-2.94,2.94) {-0.50,1.50}
Total: 8744 W: 1305 L: 1156 D: 6283
Ptnml(0-2): 75, 789, 2500, 928, 80

passed LTC
https://tests.stockfishchess.org/tests/view/5f2dcb2a61e3b6af64881ff3
LLR: 2.98 (-2.94,2.94) {0.25,1.75}
Total: 17728 W: 1256 L: 1117 D: 15355
Ptnml(0-2): 22, 961, 6774, 1070, 37

Bench: 4067325
This commit is contained in:
Vizvezdenec 2020-08-08 05:51:26 +03:00 • committed by Joost VandeVondele
parent f4c27cda1a
commit 910f779eb1
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -1028,7 +1028,7 @@ 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 < 6 if ( lmrDepth < 8
&& !ss->inCheck && !ss->inCheck
&& ss->staticEval + 284 + 188 * lmrDepth <= alpha && ss->staticEval + 284 + 188 * lmrDepth <= alpha
&& (*contHist[0])[movedPiece][to_sq(move)] && (*contHist[0])[movedPiece][to_sq(move)]