A complete course for club and tournament players
Chess is 99% tactics. This celebrated observation is not only true for beginners, but also for club players (Elo 1500 – 2000). If you want to win more games, nothing works better than training your combination skills.
There are two types of books on tactics: those that introduce the concepts followed by some examples, and workbooks that contain lots of exercises. FIDE Master Frank Erwich has done both: he explains all the key tactical ideas AND provides an enormous amount of exercises for each different theme.