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Joost VandeVondeleandStéphane Nicolet
7b278aab9f
In case the evaluation at root is large, discourage the use of lazyEval. This fixes https://github.com/official-stockfish/Stockfish/issues/3772 or at least improves it significantly. In this case, poor play with large odds can be observed, in extreme cases leading to a loss despite large advantage: r1bq1b1r/ppp3p1/3p1nkp/n3p3/2B1P2N/2NPB3/PPP2PPP/R3K2R b KQ - 5 9 With this patch the poor move is only considered up to depth 13, in master up to depth 28. The patch did not pass at LTC with Elo gainer bounds, but with slightly positive Elo nevertheless (95% LOS). STC: LLR: 2.94 (-2.94,2.94) <0.00,2.50> Total: 40368 W: 10318 L: 10041 D: 20009 Ptnml(0-2): 103, 4493, 10725, 4750, 113 https://tests.stockfishchess.org/tests/view/61800ad259e71df00dcc420d LTC: LLR: -2.94 (-2.94,2.94) <0.50,3.00> Total: 212288 W: 52997 L: 52692 D: 106599 Ptnml(0-2): 112, 22038, 61549, 22323, 122 https://tests.stockfishchess.org/tests/view/618050d959e71df00dcc426d closes https://github.com/official-stockfish/Stockfish/pull/3780 Bench: 7127040