Chess Engines Diary

Moinsen - a  C++20 UCI chess engine Author: dave7895 Moinsen 0.0.6 download github:https://github.com/dave7895/Moinsen/releases/tag/v0.0.6

Chess engine: Alexandria  Author: PGG106  Rating CEDR=3104 v.3.0 Reduce more on non-pv nodes (LMR) by @PGG106 in #29 Singular extension by @PGG106 in #31 use a separate thread to handle uci commands by @PGG106 in #32 don't nmp if current side has only king and panws on the board by @PGG106 in #33 clamp lmr reduction to [0, depth-1] by @PGG106 in #35 Skip bad captures in QSearch based on SEE score by @PGG106 in #36 Remove evaluation pruning by @PGG106 in #37 Cap history score to +-32768 by @PGG106 in #39 History pruning by @PGG106 in #40 Save original static eval and use it in place of search score when appropriate by @PGG106 in #41 stop checking if move exists before returning tt score by @PGG106 in #42 Use a Relative 768->512->1 net by @PGG106 in #43 Add flag to unroll loops to the makefile by @PGG106 in #44 Batch update Nnue in case of moved pieces by @PGG106 in #45 remove countermove heuristic by @PGG106 in #46 Cleanup Code by @PGG106 in #47 Prefetch TT entry before makemo

Caissa - UCI chess engine,  Author: Michał Witanowski Rating CEDR=3236 v.1.0: Added support for Gaviota tablebases (for now used only for root moves and during training) Introduced endgame neural network (used for positions with 4 and 5 pieces) Incrementally updated PSQT [Optimization] Neural network tuner tweaks New neural network trained on more data More hardcoded endgame knowledge Aspiration windows tweaks Caissa 1.1 download Github:https://github.com/Witek902/Caissa/releases/tag/1.1 Individual statistics: Caissa 0.5 NNUE - 230 games (+102,= 89,- 39), 63.7 % Betsabe II 1.96               :   2 (+  1,=  0,-  1), 50.0 % ECE 20.1                      :   2 (+  1,=  1,-  0), 75.0 % Dimitri 5.2.3                 :   2 (+  2,=  0,-  0), 100.0 % Fritz 17                      :   8 (+  3,=  5,-  0), 68.8 % SeeChess 1.2                  :   2 (+  2,=  0,-  0), 100.0 % Raubfisch X48e                :   2 (+  0,=  1,-  1), 25.0 % Kayra 1.3                     :   2 (+  0,=  1,-  1), 25.0 % S

Stockfish 22100309  - UCI chess engine, compiled by Disservin Rating CEDR=3566 Timestamp: 1664790631 Use less reduction for escaping moves This patch reuses the threatenedPieces variable (which is calculated in movepicker)  to reduce less in the search tree the moves which escape a capture. passed STC: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 314352 W: 84042 L: 83328 D: 146982 Elo +0.79 Ptnml(0-2): 1105, 35084, 84207, 35552, 1228 https://tests.stockfishchess.org/tests/view/63355f37a004bed9a2e4a17f passed LTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 90752 W: 24556 L: 24147 D: 42049 Elo +1.57 Ptnml(0-2): 59, 8855, 27123, 9296, 43 https://tests.stockfishchess.org/tests/view/63383a7735f43d649ff5fa8b closes https://github.com/official-stockfish/Stockfish/pull/4181 bench: 4114228 Download: 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 comput

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