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Simplify LMR multiThread condition
STC (8 threads): LLR: 2.95 (-2.94,2.94) <-2.50,0.50> Total: 110584 W: 27818 L: 27807 D: 54959 Ptnml(0-2): 156, 12089, 30791, 12100, 156 https://tests.stockfishchess.org/tests/view/6172ef436ce927be325583a9 LTC (8 threads): LLR: 2.94 (-2.94,2.94) <-2.50,0.50> Total: 23632 W: 6025 L: 5903 D: 11704 Ptnml(0-2): 5, 2292, 7100, 2414, 5 https://tests.stockfishchess.org/tests/view/6173cf096ce927be32558412 closes https://github.com/official-stockfish/Stockfish/pull/3757 No functional change (in the single-threaded case) Bench: 6689428
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@ -1159,10 +1159,9 @@ moves_loop: // When in check, search starts here
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// cases where we extend a son if it has good chances to be "interesting".
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if ( depth >= 3
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&& moveCount > 1 + 2 * rootNode
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&& ( !captureOrPromotion
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|| (cutNode && (ss-1)->moveCount > 1)
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|| !ss->ttPv)
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&& (!PvNode || ss->ply > 1 || thisThread->id() % 4 != 3))
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&& ( !ss->ttPv
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|| !captureOrPromotion
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|| (cutNode && (ss-1)->moveCount > 1)))
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{
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Depth r = reduction(improving, depth, moveCount, rangeReduction > 2);
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