Q: How do I view pdf files?
A: For example using Adobe Reader.

Q: Is it legal publishing problem collections like this?
A: I hope so (I am not publishing solutions, only board positions and most of the authors have been dead for quite a while).

Q: I found a mistake, where should I report it?
A: There are a few unsolvable (as far as my weary eyes can see) problems in the Cho Chikun collection. Some people also believe none of the Hatsuyo-ron problems have a solution, but it hasn’t been proven yet.

Q: Why isn’t Guan Zi Pu here?
A: The only version we found is severely lacking in quality. Nevertheless, you may download Guan Zi Pu 1, Guan Zi Pu 2, and Guan Zi Pu 3. These collections contain many repeating problems (take the first one as an example: 8 and 9, 11 and 12, 13 and 14 and 15, 17 and 18, etc etc. These mistakes are already in Uli’s collection, which I used as a source.

Q: How was the picture at the top created?
A: The picture was raytraced using POV-Ray.

Q: Is the POV-Ray source for the image available?
A: Maybe.