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Author	SHA1	Message	Date
TopologistandJoost VandeVondele	19a90b45bc	Use NNUE in low piece endgames close to the root. ... This patch enforces that NNUE evaluation is used for endgame positions at shallow depth (depth <= 9). Classic evaluation will still be used for high imbalance positions when the depth is high or there are many pieces. Passed STC: https://tests.stockfishchess.org/tests/view/624c193b3a8a6ac93892dc27 LLR: 2.94 (-2.94,2.94) <0.00,2.50> Total: 255840 W: 68024 L: 67362 D: 120454 Ptnml(0-2): 1074, 27089, 70926, 27763, 1068 Passed LTC: https://tests.stockfishchess.org/tests/view/624e8675e9e7821808467f77 LLR: 2.94 (-2.94,2.94) <0.50,3.00> Total: 67088 W: 17784 L: 17454 D: 31850 Ptnml(0-2): 45, 6209, 20715, 6521, 54 closes https://github.com/official-stockfish/Stockfish/pull/3978 bench: 6602222	2022-04-12 17:43:50 +02:00
TopologistandJoost VandeVondele	471d93063a	Play more positional in endgames ... This patch chooses the delta value (which skews the nnue evaluation between positional and materialistic) depending on the material: If the material is low, delta will be higher and the evaluation is shifted to the positional value. If the material is high, the evaluation will be shifted to the psqt value. I don't think slightly negative values of delta should be a concern. Passed STC: https://tests.stockfishchess.org/tests/view/62418513b3b383e86185766f LLR: 2.94 (-2.94,2.94) <0.00,2.50> Total: 28808 W: 7832 L: 7564 D: 13412 Ptnml(0-2): 147, 3186, 7505, 3384, 182 Passed LTC: https://tests.stockfishchess.org/tests/view/62419137b3b383e861857842 LLR: 2.96 (-2.94,2.94) <0.50,3.00> Total: 58632 W: 15776 L: 15450 D: 27406 Ptnml(0-2): 42, 5889, 17149, 6173, 63 closes https://github.com/official-stockfish/Stockfish/pull/3971 Bench: 7588855	2022-03-28 22:43:52 +02:00
TopologistandStéphane Nicolet	f3b296c2e2	Change advanced pawn push threshold ... A pawn push is now considered to be "advanced" if the relative destination rank is > 6 (previously it was > 5). This affects the search heuristic. Also remove an assert concerning en passant moves in qsearch(). STC: LLR: 2.97 (-2.94,2.94) {-0.25,1.25} Total: 46744 W: 4224 L: 4040 D: 38480 Ptnml(0-2): 165, 3206, 16451, 3380, 170 https://tests.stockfishchess.org/tests/view/604746082433018de7a3872e LTC: LLR: 2.94 (-2.94,2.94) {0.25,1.25} Total: 107840 W: 4198 L: 3892 D: 99750 Ptnml(0-2): 58, 3472, 46557, 3772, 61 https://tests.stockfishchess.org/tests/view/60475eae2433018de7a38737 Closes https://github.com/official-stockfish/Stockfish/pull/3389 Bench: 4796780	2021-03-10 12:32:53 +01:00