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Unify the "quiet" and "non-quiet" reduction rules for use at any kind of moves. The idea behind it was that both rules reduce at similiar cases in master: one directly for late previous moves and the other indirectly by using a bad stat score which is used for most move sorting and so approximates the late move condition. For captures/promotions the old rule was triggered in 25% but the new rule only for 3% of all cases (so now more reductions are done, whereas for quiet moves reductions keep the same level). STC: LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 162327 W: 35976 L: 36134 D: 90217 http://tests.stockfishchess.org/tests/view/5b6a9a430ebc5902bdb9d5c1 LTC: LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 29570 W: 5083 L: 4976 D: 19511 http://tests.stockfishchess.org/tests/view/5b6bc5d00ebc5902bdb9e9d6 Bench: 4526980
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