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.
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].
How strong is the Koivisto 9.2 JA engine?
RThe Koivisto engine (previous version) has a rating of 3614 in the Chess Engines Diary (CEDR) Ranking. This gives the engine 35th place on the list.
We also include Koivisto's results with other engines in the table, which allows for a better assessment of its strength.
Koivisto 9.2 vs other engines:
| Chess-System-Tal-2 | 65.5/151 | -20 | 151 Games |
| Revenge 3.0 | 62.5/120 | +5 | 120 Games |
| Ethereal 14.25 | 47/119 | -25 | 119 Games |
| Rebel 16.2 | 58.5/111 | +6 | 111 Games |
| Berserk 11.1 | 44.5/108 | -19 | 108 Games |
| RofChade 3.1 | 51/100 | +2 | 100 Games |
| Slowchess 2.9 | 53/90 | +16 | 90 Games |
| Ethereal 14.00 | 46/90 | +2 | 90 Games |
| Igel 3.5.0 | 43.5/88 | -1 | 88 Games |
| RubiChess 20230918 | 32/78 | -14 | 78 Games |
| Seer 2.8.0 | 34/70 | -2 | 70 Games |
| Fisherov chess monk 1.2 | 25/70 | -20 | 70 Games |
| RubiChess 20240112 | 28.5/69 | -12 | 69 Games |
| Igel 3.4.0 | 34.5/68 | +1 | 68 Games |
| Dragon 3.2 | 22/68 | -24 | 68 Games |
| Uralochka 3.39d | 39.5/64 | +15 | 64 Games |
| Seer 2.6.0 | 35.5/64 | +7 | 64 Games |
| RubiChess 20230407 | 31/60 | +2 | 60 Games |
| Rebel EAS | 24/58 | -10 | 58 Games |
| Booot 7.2 | 36/54 | +18 | 54 Games |
| Arasan 24.0 | 31.5/54 | +9 | 54 Games |
| Clover 6.1 | 25.5/54 | -3 | 54 Games |
| Berserk 12.1 | 22/54 | -10 | 54 Games |
| Kayra 1.7 | 12/50 | -26 | 50 Games |
| Uralochka 3.40a | 28.5/48 | +9 | 48 Games |
| RofChade 3.0 | 29/46 | +12 | 46 Games |
| Clover 6.0 | 26/46 | +6 | 46 Games |
| Stockfish 15.1 | 14.5/46 | -17 | 46 Games |
| Seer 2.7.0 | 22/40 | +4 | 40 Games |
| Wasp 6.50 | 28/38 | +18 | 38 Games |
| Fire 9.3 | 19.5/34 | +5 | 34 Games |
| Blue Marlin 15.7 | 12/34 | -10 | 34 Games |
| Kookaburra 1.03a | 9.5/34 | -15 | 34 Games |
| Alexandria 7.0.0 | 13/33 | -7 | 33 Games |
| Viridithas 11.0.0 | 19.5/32 | +7 | 32 Games |
| Caissa 1.13.1 | 15/32 | -2 | 32 Games |
| Minic 3.33 | 19.5/30 | +9 | 30 Games |
| Peacekeeper 3.01 | 13.5/29 | -2 | 29 Games |
| Obsidian 13.0 | 10/29 | -9 | 29 Games |
| Carp 3.0.1 | 17.5/28 | +7 | 28 Games |
| Berserk 13 | 10.5/28 | -7 | 28 Games |
| Dragon 3.3 | 10.5/28 | -7 | 28 Games |
| Alexandria 5.0.0 | 14/26 | +2 | 26 Games |
| Obsidian 9.0 | 12.5/26 | -1 | 26 Games |
| Caissa 1.16 | 12.5/26 | -1 | 26 Games |
| BlackCore 6.0 | 19/24 | +14 | 24 Games |
| Viridithas 12.0.0 | 13.5/24 | +3 | 24 Games |
| Caissa 1.20 | 10/23 | -3 | 23 Games |
| Motor 0.7.0 | 9.5/23 | -4 | 23 Games |
| Stormphrax 4.0.0 | 14/22 | +6 | 22 Games |
| Stormphrax 4.1.0 | 13/22 | +4 | 22 Games |
| RubiChess 20221203 | 11/22 | +0 | 22 Games |
| Minic 3.39 | 13.5/20 | +7 | 20 Games |
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