Nihon Ki-in Problem Collection
(問題集シリーズ) A series of four problem books published by the Nihon Ki-in in 1998.
- 死活の玉手箱 (Life and Death Treasure Chest) ISBN: 4-8182-0433-1. 210 problems rated for Advanced Kyu to Dan players.
- 布石からヨセまで (From Fuseki till Yose) ISBN: 4-8182-0436-6. 121 problems rated from Beginner Kyu to Dan players.
- 次の一手・手筋の魅力〈1〉 (The Appeal of Tesujis Volume 1) ISBN: 4-8182-0435-8. 108 problems rated for Intermediate to Advanced Kyu players.
- 次の一手・手筋の魅力〈2〉 (The Appeal of Tesujis Volume 2) ISBN: 4-8182-0444-7. 100 problems rated for Intermediate to Advanced Kyu players.
These books are available from Kinokuniya and Yutopian.