Rybka requires Windows XP or later.
You can purchase Rybka 4 without graphical user interface (GUI) or with the Aquarium, Chess Assistant or Fritz GUI. If you have questions about the packages, you may ask at the Rybka forum.
The "Deep" version runs faster on machines with more than one core, on single core computers there is no difference in playing strength.
Rybka 4 from RybkaChess.com
Without GUI - for download
Rybka 4 from ChessOK
Without GUI or with Aquarium - for download or on DVD
- If there are ordering problems or questions, please contact Share-It.
- For usage problems or questions, ask on the Rybka forum.
Share-It adds an "extended download" option by default, costing an extra 6 Euro. We recommend to remove it (by unclicking it from the order form) and to create a backup on CD or any other media instead.
The Rybka 4 opening book for Aquarium by Jiri Dufek is an official opening book for Rybka 4.
Aquarium is a GUI specially designed for Rybka. You can find more information about it here or watch a video about Aquarium from "Jrobichess":