Koivisto, is a strong chess engine written primarily by Kim Kåhre and Finn Eggers in c++. Koivisto in itself is not a complete chess program and requires a UCI-compatible graphical user interface.
Rating CEDR=3379 (6 place) - Time:15'+10" Rating CEDR=3361 (8 place) - Time 3'+3"
Koivisto an UCI compliant open source chess engine by Kim Kåhre and Finn Eggers, at times supported by Eugenio Bruno, written in C++, and first released on GitHub in September 2020 under the GPL v3.0. The bitboard engine provides automated evaluation tuning by logistic regression, either using stochastic gradient descent or AdaGrad. Koivisto 5.0 in July 2021 replaced the perceptron approach of a real-men-evaluation (RME) by an own NNUE, as of Koivisto 5.9, with two layers [source].
Fritz 17 : 6 (+ 4,= 2,- 0), 83.3 %
Topple 0.8.1 : 10 (+ 10,= 0,- 0), 100.0 %
Pedone 3.1 : 2 (+ 0,= 2,- 0), 50.0 %
Fire 8 NN MC.3 : 12 (+ 1,= 11,- 0), 54.2 %
GreKo 2021.08 NNUE : 10 (+ 6,= 4,- 0), 80.0 %
Zeus 11.0 : 2 (+ 0,= 2,- 0), 50.0 %
Benjamin 1.1 : 10 (+ 9,= 1,- 0), 95.0 %
Stockfish 14.1 : 10 (+ 0,= 8,- 2), 40.0 %
Stockfish 13 : 2 (+ 0,= 1,- 1), 25.0 %
Fat Fritz 2 210822 : 1 (+ 1,= 0,- 0), 100.0 %
Nemorino 6.00 : 2 (+ 2,= 0,- 0), 100.0 %
SugaR AI 2.50 : 2 (+ 0,= 2,- 0), 50.0 %
Igel 3.0.10 : 2 (+ 0,= 2,- 0), 50.0 %
Fisherov 0.98i : 3 (+ 0,= 3,- 0), 50.0 %
Seer 2.4.0 : 2 (+ 0,= 2,- 0), 50.0 %
Fisherov 0.98j : 12 (+ 0,= 9,- 3), 37.5 %
Lc0 0.28.2 : 10 (+ 0,= 7,- 3), 35.0 %
Wasp 5.20 second compiles : 2 (+ 2,= 0,- 0), 100.0 %
Fritz 15 : 2 (+ 1,= 1,- 0), 75.0 %
Minic 3.18 : 2 (+ 2,= 0,- 0), 100.0 %
Tucano 10.00 : 2 (+ 0,= 2,- 0), 50.0 %
Blue Marlin 14.8 : 3 (+ 0,= 1,- 2), 16.7 %
Dragon 2.6.1 : 12 (+ 0,= 10,- 2), 41.7 %
ClassicAra 0.9.9 : 10 (+ 9,= 1,- 0), 95.0 %
SlowChess 2.83 : 10 (+ 1,= 9,- 0), 55.0 %
Crystal 251221 : 1 (+ 0,= 1,- 0), 50.0 %
Rebel 14.2 : 2 (+ 0,= 2,- 0), 50.0 %
Raubfisch X48e : 3 (+ 0,= 3,- 0), 50.0 %
Arasan 23.3 : 2 (+ 0,= 2,- 0), 50.0 %
Caissa 0.5 : 2 (+ 1,= 1,- 0), 75.0 %
Kayra 1.2 : 2 (+ 0,= 1,- 1), 25.0 %
Black Marlin 5.0 : 2 (+ 2,= 0,- 0), 100.0 %
CorChess 010422 : 1 (+ 0,= 1,- 0), 50.0 %
Stockfish 010422 Ivec : 1 (+ 0,= 1,- 0), 50.0 %
Kayra 1.3 : 1 (+ 0,= 1,- 0), 50.0 %
Stockfish 280322 : 2 (+ 0,= 1,- 1), 25.0 %
Sting 28 : 2 (+ 1,= 1,- 0), 75.0 %
Inanis 1.0.1 : 4 (+ 4,= 0,- 0), 100.0 %
Raubfisch X48 : 2 (+ 0,= 2,- 0), 50.0 %
Mayhem 7.1 : 4 (+ 4,= 0,- 0), 100.0 %
Houdidit 6.03 : 2 (+ 1,= 1,- 0), 75.0 %
ProteusSF 005 : 2 (+ 0,= 1,- 1), 25.0 %
Swordfish 14.9 : 2 (+ 0,= 2,- 0), 50.0 %
Lc0 0.29.0-rc0 : 2 (+ 0,= 2,- 0), 50.0 %
Mayhem 7.2 : 4 (+ 1,= 3,- 0), 62.5 %
Wasp 5.50 : 4 (+ 2,= 2,- 0), 75.0 %
Frozenight 3.0.1 : 4 (+ 4,= 0,- 0), 100.0 %
Stockfish 15 : 2 (+ 0,= 1,- 1), 25.0 %
Orion 0.9 : 4 (+ 4,= 0,- 0), 100.0 %
Berserk 9-dev e68765ea32a3 : 2 (+ 0,= 2,- 0), 50.0 %
Slowchess 2.83 : 2 (+ 0,= 2,- 0), 50.0 %
Koivisto 8.12a - 16 binary (Ipman compiles) - download
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