By Gunnar Dickfeld, english, 187 pages.
What is the most important skill in Go? It is the ability to calculate variations. In the middlegame, about eighty per cent is reading ability, the rest is intuition. To improve your reading ability, you absolutely need to practise life-and-death problems.
This book presents 180 life-and-death problems with only a hint as to whether the solution involves a ko or not. The solutions are limited to a diagram, so you may have to figure out for yourself why your attempt to solve the problem failed.