300 traditional problems under the heading "Task", which you can solve by loading random positions; or you can go through the theme key and work your way through individual tactical themes and motifs; or you can work your way up from the easiest categories, ending with the most difficult problems. A second file contains 100 positions where you have a choice between two moves, one being a blunder and the other a good or simply playable move. Created and compiled by GM Rainer Knaak. Note: This item may ship separately from the rest of your order.