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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.

Available packages:

Rybka
Rybka
Rybka
Rybka 4 from RybkaChess.com
Without GUI - for download
Rybka 4 from ChessOK
Without GUI or with Aquarium - for download or on DVD
Rybka 4 from Chessbase
With Fritz GUI - on DVD


Rybka 4 from RybkaChess.com

Rybka
Purchase links:
-Rybka 4 (without graphical user interface) for download
-Deep Rybka 4 (without graphical user interface) for download
Important notes:
- 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.

Rybka 4 from ChessOK

Rybka
Available packages:
-Rybka 4 without graphical user interface
-Rybka 4 without graphical user interface (download)
-Deep Rybka 4 without graphical user interface
-Deep Rybka 4 without graphical user interface (download)
-Rybka 4 & Aquarium GUI
-Rybka 4 & Aquarium GUI (download)
-Deep Rybka 4 & Aquarium GUI
-Deep Rybka 4 & Aquarium GUI (download)
-Official Rybka 4 opening book for Aquarium by Jiri Dufek
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":


Rybka 4 from Chessbase

Rybka
Available packages
-Rybka 4 (with Fritz 12 GUI)
-Deep Rybka 4 (with Fritz 12 GUI)
-Official Rybka 4 opening book for Chessbase by Jiri Dufek