Blue is the color of water. The game is fluid and testifies to unbridled and dangerous power. This book requires the student to correctly assess the forces and to pay attention to the interactions of the positions. Concentration and reading are required.
The exercises are arranged in sets of six questions per page, covering all areas of the Go fundamentals: basic techniques of capturing, cutting and connecting, life and death, attacking and protecting, and semeai. Various types of tesuji are included in each of the above topics.
There is no order or arrangement to the problems like in the first three books. The problems are mixed to provide realistic challenges. The difficulty too is well mixed. It does not gradually increase throughout the book, but rather fluctuates to prevent the student from easing into a steady flow.
The answers in this exercise book are all one-move answers. Sometimes the difference between a correct and a wrong answer may just depend on whether there still remains the potential for a ko threat or not.
Like all books of this series it can be used as a classroom tutorial, as an after-school exercise, or as a test for self-learners who would like to improve their reading.
