I have a moderately sized chess library (100+ books), and this work is one of my least favorites. Besides having descriptive (i.e., old, non-algebraic) notation, the puzzle collection suffers from numerous other problems. The positions often appear composed rather than naturally occurring, and no credit is given regarding who created the puzzles to be solved. Further, the print quality of the diagrams is sub par, which means that solving the problems straight from the book isn't as easy as it should be. Overall, this book is quite a disappointment. I recommend that you pick up another tactics book for middlegame or endgame practice.