Latest abrok Development Version December 10 th (SF The gift that keeps on giving )

Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64	Author: Guenther Demetz Date: Tue Dec 10 08:07:34 2019 +0100 Timestamp: 1575961654 Refine improving-logic Don't rely on the assumption that we are improving after surviving a check. Instead, compare with the static eval of 2 moves before. STC https://tests.stockfishchess.org/tests/view/5dedfd7f3cff9a249bb9e44d LLR: 2.95 (-2.94,2.94) [-1.50,4.50] Total: 38859 W: 8621 L: 8397 D: 21841 Elo +2.00 LTC https://tests.stockfishchess.org/tests/view/5dee1b5a3cff9a249bb9e465 LLR: 2.95 (-2.94,2.94) [0.00,3.50] Total: 51130 W: 8308 L: 7996 D: 34826 Elo +2.12 Bench: 5371271
Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64	Author: lantonov Date: Tue Dec 10 01:10:19 2019 +0100 Timestamp: 1575936619 Tuned razor and futility margins Tuning was done with Bayesian optimisation with the following parameters: Acquisition function: Expected Improvement alpha: 0.05 xi: 1e-4 TC: 60+0.6 Number of iterations: 100 Initial points: 5 Batch size: 20 games STC http://tests.stockfishchess.org/tests/view/5dee291e3cff9a249bb9e470 LLR: 2.97 (-2.94,2.94) [-1.50,4.50] Total: 19586 W: 4382 L: 4214 D: 10990 Elo +2.98 LTC http://tests.stockfishchess.org/tests/view/5dee4e273cff9a249bb9e473 LLR: 2.95 (-2.94,2.94) [0.00,3.50] Total: 38840 W: 6315 L: 6036 D: 26489 Elo +2.50 Bench: 5033242
Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64	Author: xoto10 Date: Tue Dec 10 01:04:07 2019 +0100 Timestamp: 1575936247 TrappedRook value and King positional tables Small tweak to increase the TrappedRook penalty. Nice idea by Alain Savard! STC LLR: 2.96 (-2.94,2.94) [-1.50,4.50] Total: 36977 W: 8212 L: 7993 D: 20772 Elo +2.06 https://tests.stockfishchess.org/tests/view/5dee1c1e3cff9a249bb9e46d LTC LLR: 2.95 (-2.94,2.94) [0.00,3.50] Total: 36395 W: 6070 L: 5795 D: 24530 Elo +2.63 https://tests.stockfishchess.org/tests/view/5dee90153cff9a249bb9e479 Closes https://github.com/official-stockfish/Stockfish/pull/2447 Bench: 5176990 ------------------------- Comments by Alain Savard: For the record, the idea was to run an experimental tuning with disabled castling in the hope to get more hits on the TrappedRook and the king in the c1- f1-f2-c2 area http://tests.stockfishchess.org/tests/view/5dec57be51219d7befdc76e1 A first interpretation of that tuning was green STC (0, 4) and yellow LTC (0, 4): http://tests.stockfishchess.org/tests/view/5ded04bc51219d7befdc773a http://tests.stockfishchess.org/tests/view/5ded1e7a51219d7befdc7760 Thank you @xoto for trying this. Indeed, because the tuned Kc2 and Kf2 values were quite different, it was a good idea to try something more neutral.

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