This book is not like your typical tactics book which discusses pins forks, skewers etc, nor is it a workbook of puzzles. the book does have some puzzles which are used to quiz what you have studied.
this book is an excellent book for intermediate players looking to become advance players. Its sort of the missing link to the next level. its meant for those who already understand the basic tatical motifs and combinational motifs. this book deals with subtle tactics, that is silent moves that lead to a tactical blow. So many of the games he discussed a crucial point where silent moves are required to create a combination or tactical blow.
this book changed my perspective of play. I would play base on major and minor peice positions and try to create a tactical advangtage, but after studying the the book I now added pawns to my play and have been making subtle moves that lead to the collapse of my opponent.
The book is well, written the games used to illustartye the ideas are facinating, and learning subtle tactics will be one of the greatest weapons in your arsenal. Highly recommend this book to any intermediate level player who is stuck at that level but want to move on to the next level.