This is the book that will bring your tactical ability up to that of an expert player. Especially recommended for players who have just learned the rules. Even strong players will be able to improve their tesuji skills through the repetitive practice provided by the problems in this book. More specifically, study this book and you will really get strong at the endgame. It would be an exaggeration to say that most games are decided in the endgame, but for sure a great many upsets are pulled off at this stage.
Players often come out of the opening with a clear lead, only to see it dwindle away in the endgame.
On the other hand, if your opening and middle game are not so strong, the surest way to stage an upset is to become a strong endgame player. You will also find that the key to winning handicap games with white is not necessarily to study handicap openings and josekis, but to get strong in the endgame. This book makes studying the endgame easy. It starts out with a 42-problem test. Unless you're already strong in the endgame, expect to do badly.