Rybka 4 Aquarium (DVD) # Most powerful Rybka 4 engine! # New correspondence chess module and improved support for correspondence players* # Further IDEA improvements* # Interface improvements* # Various new features* Rybka 4 engine - World Computer Chess champion and rating lists leader. Rybka 4 can be also used in Fritz and other chess programs # Analyze and annotate your games with Aquarium's advanced analysis methods. # Databases with fast searches # Powerful and fast chess trees # Play against the computer # Publish your chess text: Print, word processor or web # Free internet chess server access for playing against chess players all over the world Database: 4,600,000 games (up to April 1, 2010). Lightning fast database searches. Chessbase/Fritz CBH format (reads and converts), Chess Assistant CDP, PGN and EPD databases