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=3583 (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].
Individual statistics: Koivisto 8.6 - 90 games (+ 9,= 64,- 17), 45.6 %
CorChess 180422 : 8 (+ 0,= 6,- 2), 37.5 %
Raubfisch X48e : 8 (+ 0,= 6,- 2), 37.5 %
SugaR AI 2.50 : 4 (+ 0,= 3,- 1), 37.5 %
Dragon 2.6.1 : 4 (+ 0,= 4,- 0), 50.0 %
Kayra 1.3 : 8 (+ 0,= 7,- 1), 43.8 %
Stockfish 15 : 8 (+ 0,= 6,- 2), 37.5 %
Fisherov 0.98k : 10 (+ 0,= 7,- 3), 35.0 %
BrainLearn 17 : 6 (+ 0,= 5,- 1), 41.7 %
Eman 7.93 : 6 (+ 0,= 3,- 3), 25.0 %
ShashChess 22 : 2 (+ 0,= 0,- 2), 0.0 %
Weiawaga 5.0.0 : 2 (+ 2,= 0,- 0), 100.0 %
Wasp 5.50 : 2 (+ 0,= 2,- 0), 50.0 %
Rebel 15 : 2 (+ 1,= 1,- 0), 75.0 %
Komodo 13.02 : 2 (+ 1,= 1,- 0), 75.0 %
Arasan 23.3 : 2 (+ 0,= 2,- 0), 50.0 %
Stockfish 030522 : 4 (+ 0,= 4,- 0), 50.0 %
Avalanche 0.3a : 2 (+ 2,= 0,- 0), 100.0 %
Swordfish 15.1 : 2 (+ 0,= 2,- 0), 50.0 %
Rebel 14.2 : 2 (+ 2,= 0,- 0), 100.0 %
Seer 2.5 : 2 (+ 1,= 1,- 0), 75.0 %
Blue Marlin 15.1 : 2 (+ 0,= 2,- 0), 50.0 %
Berserk 9-dev : 2 (+ 0,= 2,- 0), 50.0 %
Koivisto 9.2 - 16 binary (Ipman compiles) - download
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