Chess Combinations Encyclopedia - $43.95
A fundamental program on chess tactics including more than 4000 training examples and exercises classified by more than 100 tactical methods and motifs. The complexity of the exercises grows inside each theme from beginner to advanced chess player. Individual ratings are calculated on the basis of the user's performance and statistics are gathered for each user. When studying each theme step by step, you can master all the tactical methods and improve your play drastically.