Deep Rybka 4 Aquarium (DVD) Deep Rybka 4 engine - World Computer Chess champion and rating lists leader. Deep 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