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UCI engines
With Kvetka you can use any chess engine which supports UCI format. Nowadays UCI is the most popular protocol for interacting between the chess engines and their graphic interfaces. It replaces format Xboard/Windboard. There is also a closed commercial format used by the company ChessBase but nowadays only Fritz is still tied to its graphic shell and doesn't have its UCI version.
Free engines
- StockFish - one of the strongest engines for today. Version 1.8 is provided together with Kvetka.
- Houdini - another engine which claims to be the strongest. However some people suspect it not to be completely legal.
- Rybka 2.232 – "Rybka" version which becomes free after Rybka 3 release.
- List of free UCI-engines, sorted by their ratings.
- Another list, collected in the Wikipedia. The difference of the lists should not surprise you because there is no any admitted rating in the world of chess programs. There are several championships (including world championships) with different hardware and time control.
- WildCat – Product from belarusian programmer Igor Korshunov.
- Belka – Another Igor Korshunov's engine based on the sources of Russian "Strelka".
- Fruit. Legendary engine which was the strongest some time ago. It is programmed by Fabien Letouzey from France. Nowadays it is outrun by a number of other engines.
Commercial engines
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