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Smooth dependency on improvement margin in null move search. STC LLR: 2.93 (-2.94,2.94) <-0.50,2.50> Total: 17384 W: 4468 L: 4272 D: 8644 Ptnml(0-2): 42, 1919, 4592, 2079, 60 https://tests.stockfishchess.org/tests/view/61689b8a1e5f6627cc1c0fdc LTC LLR: 2.94 (-2.94,2.94) <0.50,3.50> Total: 45648 W: 11525 L: 11243 D: 22880 Ptnml(0-2): 26, 4731, 13036, 4997, 34 https://tests.stockfishchess.org/tests/view/6168a12c1e5f6627cc1c0fe3 It would be interesting to test if the other pruning/reduction heuristics in master which are using the improving variable (ie the sign of improvement) could benefit from a smooth function of the improvement value (or maybe a Relu of the improvement value). closes #3740 Bench: 4916775
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