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Increase reduction based on correct expectation
If the current node is not a cutNode then it means that the child is one in LMR and the cutoff count is expected, so more reduction when the cutoffs are expected Passed STC: https://tests.stockfishchess.org/tests/view/66815e791c5b344a34ca7090 LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 64416 W: 16876 L: 16519 D: 31021 Ptnml(0-2): 150, 7670, 16264, 7921, 203 Passed LTC: https://tests.stockfishchess.org/tests/view/668162f61c5b344a34ca725c LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 78186 W: 19905 L: 19499 D: 38782 Ptnml(0-2): 55, 8561, 21437, 9003, 37 closes https://github.com/official-stockfish/Stockfish/pull/5422 bench: 1161531
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@ -1157,7 +1157,7 @@ moves_loop: // When in check, search starts here
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// Increase reduction if next ply has a lot of fail high (~5 Elo)
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if ((ss + 1)->cutoffCnt > 3)
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r++;
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r += 1 + !(PvNode || cutNode);
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// For first picked move (ttMove) reduce reduction
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// but never allow it to go below 0 (~3 Elo)
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