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Simplify futility pruning parent node
only continuation histories seem needed for this purpose. STC: http://tests.stockfishchess.org/tests/view/5e6b88dfe42a5c3b3ca2e4ab LLR: 2.94 (-2.94,2.94) {-1.50,0.50} Total: 113356 W: 21725 L: 21696 D: 69935 Ptnml(0-2): 1999, 13255, 26163, 13240, 2021 LTC: http://tests.stockfishchess.org/tests/view/5e6babbfe42a5c3b3ca2e4c2 LLR: 2.94 (-2.94,2.94) {-1.50,0.50} Total: 22164 W: 2917 L: 2821 D: 16426 Ptnml(0-2): 173, 2040, 6548, 2160, 161 closes #2583 bench: 4839496
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