Latest abrok Development Version November 5th 2021 (SF The gift that keeps on giving

Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64	Author: Stefan Geschwentner Date: Fri Nov 5 22:22:30 2021 +0100 Timestamp: 1636147350 Tweak initial aspiration window. Maintain for each root move an exponential average of the search value with a weight ratio of 2:1 (new value vs old values). Then the average score is used as the center of the initial aspiration window instead of the previous score. Stats indicate (see PR) that the deviation for previous score is in general greater than using average score, so later seems a better estimation of the next search value. This is probably the reason this patch succeded besides smoothing the sometimes wild swings in search score. An additional observation is that at higher depth previous score is above but average score below zero. So for average score more/less fail/low highs should be occur than previous score. STC: LLR: 2.97 (-2.94,2.94) <0.00,2.50> Total: 59792 W: 15106 L: 14792 D: 29894 Elo +1.82 Ptnml(0-2): 144, 6718, 15869, 7010, 155 https://tests.stockfishchess.org/tests/view/61841612d7a085ad008eef06 LTC: LLR: 2.94 (-2.94,2.94) <0.50,3.00> Total: 46448 W: 11835 L: 11537 D: 23076 Elo +2.23 Ptnml(0-2): 21, 4756, 13374, 5050, 23 https://tests.stockfishchess.org/tests/view/618463abd7a085ad008eef3e closes https://github.com/official-stockfish/Stockfish/pull/3776 Bench: 6719976 see source
Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64	Author: Joost VandeVondele Date: Fri Nov 5 22:20:37 2021 +0100 Timestamp: 1636147237 do not store qsearch positions in TT as exact. in qsearch don't store positions in TT with the exact flag. passed STC: https://tests.stockfishchess.org/tests/view/617f9a29af49befdeee40231 LLR: 2.95 (-2.94,2.94) <-2.25,0.25> Total: 155568 W: 39003 L: 39022 D: 77543 Elo -0.04 Ptnml(0-2): 403, 17854, 41305, 17803, 419 passed LTC: https://tests.stockfishchess.org/tests/view/6180d47259e71df00dcc42a5 LLR: 2.94 (-2.94,2.94) <-2.25,0.25> Total: 79640 W: 19993 L: 19910 D: 39737 Elo +0.36 Ptnml(0-2): 37, 8356, 22957, 8427, 43 closes https://github.com/official-stockfish/Stockfish/pull/3775 Bench: 7531210 see source
Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64	Author: Michael Chaly Date: Fri Nov 5 22:18:59 2021 +0100 Timestamp: 1636147139 Do more reductions at Pv nodes with low delta This patch increases reduction for PvNodes that have their delta (difference between beta and alpha) significantly reduced compared to what it was at root. passed STC https://tests.stockfishchess.org/tests/view/617f9063af49befdeee40226 LLR: 2.94 (-2.94,2.94) <0.00,2.50> Total: 220840 W: 55752 L: 55150 D: 109938 Elo +0.95 Ptnml(0-2): 583, 24982, 58712, 25536, 607 passed LTC https://tests.stockfishchess.org/tests/view/61815de959e71df00dcc42ed LLR: 2.95 (-2.94,2.94) <0.50,3.00> Total: 79000 W: 19937 L: 19562 D: 39501 Elo +1.65 Ptnml(0-2): 36, 8190, 22674, 8563, 37 closes https://github.com/official-stockfish/Stockfish/pull/3774 bench: 6717808 see source
Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64	Author: lonfom169 Date: Fri Nov 5 22:15:53 2021 +0100 Timestamp: 1636146953 More futility pruning Expand maximum allowed eval by 50% in futility pruning, above the VALUE_KNOWN_WIN. STC: LLR: 2.95 (-2.94,2.94) <-0.50,2.50> Total: 128208 W: 32534 L: 32192 D: 63482 Elo +0.93 Ptnml(0-2): 298, 13484, 36216, 13790, 316 https://tests.stockfishchess.org/tests/view/6179c069a9b1d8fbcc4ee716 LTC: LLR: 2.96 (-2.94,2.94) <0.50,3.50> Total: 89816 W: 22645 L: 22265 D: 44906 Elo +1.47 Ptnml(0-2): 41, 8404, 27650, 8760, 53 https://tests.stockfishchess.org/tests/view/617ad728f411ea45cc39f895 closes https://github.com/official-stockfish/Stockfish/pull/3767 bench: 6804175 see source

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