The best that we offer and allows you to pick 3 out of the 6 Chess King Training series. Chess King Pro is the most powerful professional tool a chess player can have access to, since it includes Houdini 2 Pro as well as the GigaKing Chess Games Database, and a free subscription for games for all of 2012. The Chess King Training series completes chess education in all important areas of chess study. A must for the serious chess student. Select the 3 volumes you would like to have out of the 6-disk collection and let us know by email.