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Michael ChalyandJoost VandeVondele
de2bf1a186
This patch removes lmrDepth limit for quiet moves history based pruning. Previously removal of this type of depth limits was considered bad because it was performing bad for matetrack - but with this pruning heuristic this shouldn't be that bad because it's "naturally" depth limited by history threshold and should be completely disabled at depth >= 15 or so. Also this heuristic in previous years was known to scale non-linearly - bigger lmrDepth thresholds were better at longer time controls and removing it completely probably should scale pretty well. Passed STC: https://tests.stockfishchess.org/tests/view/6692b89b4ff211be9d4eab21 LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 114464 W: 29675 L: 29545 D: 55244 Ptnml(0-2): 372, 12516, 31329, 12640, 375 Passed LTC: https://tests.stockfishchess.org/tests/view/6692c4554ff211be9d4eab3d LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 67746 W: 17182 L: 17014 D: 33550 Ptnml(0-2): 28, 6993, 19652, 7183, 17 closes https://github.com/official-stockfish/Stockfish/pull/5485 Bench: 1250388