Chess Assistant 13 Professional Package Advanced database management and fast search; unique Tree Mode for better analysis Play and analyze with Houdini 3 Pro  the strongest engine available HUGE game databases and CAP evaluations; premium updates of 3000 new games per week Chess Opening Encyclopedia 2012 and 1-year premium in the ChessOK Online Playing Zone Bonus: ChessOK Aquarium 2012 interface featuring the unique Interactive Deep Analysis system