"Most tactics and training books are good for boosting your calculation ability, but they do not teach you how to calculate. This is the difference I want to make with my own books, by arranging the exercises in different categories so that the thinking process more closely resembles the one we have during a game." ~ GM Romain Edouard Teaser…
The problems in the book are accessible to players with a level from modest to confident. The most difficult ones are marked with an asterisk, while the most challenging chapter comes with a help page, that you may check when necessary.