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More reduction at cut nodes which are not a former PV node
But the tt move and first killer are excluded. This idea is based on following LMR condition tuning https://tests.stockfishchess.org/tests/view/66228bed3fe04ce4cefc0c71 by using only the two largest terms P[0] and P[1]. Passed STC: LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 173248 W: 45091 L: 44565 D: 83592 Ptnml(0-2): 693, 20534, 43673, 21002, 722 https://tests.stockfishchess.org/tests/view/6629603b3fe04ce4cefc7d37 Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 722394 W: 183231 L: 181487 D: 357676 Ptnml(0-2): 462, 80650, 197252, 82348, 485 https://tests.stockfishchess.org/tests/view/662cbe45d46f72253dcff7bf closes #5199 Bench: 1619613
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