Latest abrok Development Version 21 st / 22nd October (SF The gift that keeps on giving

!! latest version !! 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: Taras Vuk Date: Sun Oct 22 16:16:02 2023 +0200 Timestamp: 1697984162 Simplify futilityBase formula This patch replaces std::min(ss->staticEval, bestValue) with ss->staticEval in the futilityBase formula. Original idea by Vizvezdenec: https://tests.stockfishchess.org/tests/view/64ce66795b17f7c21c0d85f3 Passed STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 116928 W: 29925 L: 29793 D: 57210 Elo +0.39 Ptnml(0-2): 399, 13558, 30446, 13634, 427 https://tests.stockfishchess.org/tests/view/653285aade6d262d08d385dd Passed LTC: LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 50868 W: 12947 L: 12757 D: 25164 Elo +1.30 Ptnml(0-2): 30, 5414, 14355, 5606, 29 https://tests.stockfishchess.org/tests/view/65336ffbde6d262d08d39ba0 closes https://github.com/official-stockfish/Stockfish/pull/4837 bench: 1241996 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: Disservin Date: Sun Oct 22 16:06:27 2023 +0200 Timestamp: 1697983587 add clang-format This introduces clang-format to enforce a consistent code style for Stockfish. Having a documented and consistent style across the code will make contributing easier for new developers, and will make larger changes to the codebase easier to make. To facilitate formatting, this PR includes a Makefile target (`make format`) to format the code, this requires clang-format (version 17 currently) to be installed locally. Installing clang-format is straightforward on most OS and distros (e.g. with https://apt.llvm.org/, brew install clang-format, etc), as this is part of quite commonly used suite of tools and compilers (llvm / clang). Additionally, a CI action is present that will verify if the code requires formatting, and comment on the PR as needed. Initially, correct formatting is not required, it will be done by maintainers as part of the merge or in later commits, but obviously this is encouraged. fixes https://github.com/official-stockfish/Stockfish/issues/3608 closes https://github.com/official-stockfish/Stockfish/pull/4790 Co-Authored-By: Joost VandeVondele <> 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: mstembera Date: Sat Oct 21 10:37:27 2023 +0200 Timestamp: 1697877447 Scale down stat bonus STC https://tests.stockfishchess.org/tests/view/652eff58de6d262d08d33353 LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 88224 W: 22618 L: 22228 D: 43378 Elo +1.54 Ptnml(0-2): 282, 10177, 22783, 10609, 261 LTC https://tests.stockfishchess.org/tests/view/652fd13bde6d262d08d3481a LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 143508 W: 36674 L: 36142 D: 70692 Elo +1.29 Ptnml(0-2): 92, 15240, 40534, 15820, 68 Reduces the stat bonus by 20%. Maybe future patches can tune the actual bonus calculations for different histories. closes https://github.com/official-stockfish/Stockfish/pull/4836 bench: 1185932 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: Taras Vuk Date: Sat Oct 21 10:34:12 2023 +0200 Timestamp: 1697877252 Subtract the margin from the value returned by ProbCut This patch subtracts the margin from the value returned by ProbCut. Passed STC: LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 46112 W: 11940 L: 11610 D: 22562 Elo +2.49 Ptnml(0-2): 131, 5318, 11842, 5620, 145 https://tests.stockfishchess.org/tests/view/652ea42ade6d262d08d329dd Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 86880 W: 22192 L: 21776 D: 42912 Elo +1.66 Ptnml(0-2): 43, 9213, 24510, 9633, 41 https://tests.stockfishchess.org/tests/view/652f70ffde6d262d08d33e8d closes https://github.com/official-stockfish/Stockfish/pull/4835 bench: 1135313 see source

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