Like most Stack Exchange sites, the FAQ states:
You should only ask practical, answerable questions based on actual problems that you face.
How should we interpret that when submitting puzzle questions to the site? Should only positions that are reachable in an actual game be considered, or are contrived examples okay too?
Or am I wrong in assuming that puzzle questions are on-topic here at all? After a quick look through the top questions on the main site I don't see any. I'm talking about the "black to mate in 3" style puzzle questions that you often see in books and magazines.