Kada’s Tsumego
Katsuji Kada (加田克司, 1931–1996) was a Japanese professional Go player famous for his artistic Tsumego. What sets Kada’s Tsumego apart from others is the number of solution diagrams per puzzle.
Kada believed not only that the solution to a problem must be discussed in detail, but also that studying the solution process is more important than actually solving the problem.
Kada’s books are the only source I know of that provides examples of how forward-looking visualization (“reading”) can take place in complex situations.
I have published a short excerpt from the first volume of the series 傑作詰碁, which has unfortunately been out of print for a long time.
Note: The text is in German, you might have to use your browser’s translation UI.