| Booklet | Mobile | Difficulty | Problems |
|---|---|---|---|
| Cho's enc. – Elementary | Mobile | 900 | |
| Cho's enc. – Intermediate | Mobile | 861 | |
| Cho's enc. – Advanced | Mobile | 792 | |
| Gokyo Shumyo | Mobile | 520 | |
| Xuanxuan Qijing | Mobile | 347 | |
| Igo Hatsuyo-ron | Mobile | 183 |
Hey yo, all the books have gotten refreshed for 2018: better layout, nicer wording, vectorized mobile version.
Cho Chikun's Encyclopedia of Life and Death is a wonderful progression which will take you from an absolute beginner to mid dan level.
Next, we present you with the three most famous classical tsumego collections. Gokyo Shumyo deals mostly with patterns occuring often in real games. XuanXuan Qijing focuses on feeling and vital points, and the insanely difficult Igo Hatsuyo-ron is here just to make you cry.