Rybka 4 Aquarium is a revolutionary analysis and database tool, combined with the world’s strongest chess playing engine, Rybka 4.
Deep Rybka 4 Aquarium offers advanced analysis functions, game commenting, searching, powerful chess trees, playing, databases and much more.

Main Features:
- Analysis is stored in a chess tree which can be viewed in the tree window.
- Multiple chess engines can be run simultaneously either in one window or in separate windows.
- Special threats analysis, multi-variation mode, selected moves exclusion, only tree moves analysis, etc.