Graded Go Problems for Beginners, 30 Kyu to 25 Kyu (Beginner & Elementary Go Bks.)
Kano Yoshinori, Richard Bozulich
This book is great for somebody who who knows just the rules but is interesting in getting stronger, and equally great from somebody who has played several games and is looking for high quality problems to practice with. The first several dozen problems are very easy, but after prob. 100 they can start to take some real thinking (at least for beginners). The author generally provides both the correct answer and one incorrect answer with a brief explanation of why its wrong.
My only complaint is that the answers are in the back of the book rather than on the next page, but don't let that stop you from getting it.
