ChessOK Aquarium 2012 offers advanced analysis functions, game commenting, searching, powerful chess trees, playing, databases and much more. If you already own the Houdini 3 UCI engine and are looking for an appropriate interface, ChessOK Aquarium 2012 is the best you can find. Connect Houdini 3/Houdini 3 PRO UCI to ChessOK Aquarium 2012 - and you have a fully functional product, fully equivalent to Houdini 3 Aquarium or Houdini 3 PRO Aquarium. Play against the computer. Choose from three different strength handicap methods, material handicap or time handicap. You can also just set the ELO level you want to play against!