Tweak futility pruning
Exclude moves with a good history total from futility pruning. This adds a condition for quiet futility pruning: history total has to be low. STC: LLR: 2.94 (-2.94,2.94) {-1.00,3.00} Total: 20095 W: 4503 L: 4342 D: 11250 Ptnml(0-2): 362, 2380, 4422, 2486, 388 http://tests.stockfishchess.org/tests/view/5e0d7c5387585b1706b68370 LTC: LLR: 2.94 (-2.94,2.94) {0.00,2.00} Total: 53016 W: 8587 L: 8302 D: 36127 Ptnml(0-2): 353, 5397, 14751, 5545, 423 http://tests.stockfishchess.org/tests/view/5e0e30d062fb773bb7047e95 Closes https://github.com/official-stockfish/Stockfish/pull/2472 Bench: 5215200pull/2474/head^2
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@ -1003,7 +1003,11 @@ moves_loop: // When in check, search starts from here
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// Futility pruning: parent node (~2 Elo)
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if ( lmrDepth < 6
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&& !inCheck
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&& ss->staticEval + 255 + 182 * lmrDepth <= alpha)
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&& ss->staticEval + 255 + 182 * lmrDepth <= alpha
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&& thisThread->mainHistory[us][from_to(move)]
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+ (*contHist[0])[movedPiece][to_sq(move)]
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+ (*contHist[1])[movedPiece][to_sq(move)]
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+ (*contHist[3])[movedPiece][to_sq(move)] < 30000)
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continue;
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// Prune moves with negative SEE (~10 Elo)
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