New Products: Rybka 4 Aquarium & Rybka 4 Aquarium Opening Book
Rybka 4 Aquarium offers advanced analysis functions, game commenting, databases, powerful chess trees, playing, internet publishing capabilities and much more.

Rybka 4 Aquarium Opening Book provides latest chess theory approved on millions of advanced chess games and matches of top human players.
ChessOK.com » Play Chess against Computer

Test you chess skills and challenge one of the strongest chess playing programs in the world! You have three levels of difficulty to select from and it’s possible to change the appearance of your chess pieces. Click New Game to choose the colour of your pieces - White or Black. To enter a move you should click on a piece and drag it to the desired square.

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