I have written an article about Xiang Qi and retrograde analysis problems, you can find it here:
http://abrobecker.free.fr/chess/XiangQi.pdf

If you know more retrograde problems, construction problems like n°50, odd problems or very long mates (like pdb.dieschwalbe.de/search.jsp... in chess), or have improved a record I would be glad to see them. 😃

Best regards,
Alain

1

Cool!

I read parts of this book that has a lot of retrograde problems: "The Chess Mysteries of Sherlock Holmes: Fifty Tantalizing Problems of Chess Detection"

I believe there are also other books based on Sherlock Holmes that deal with retrograde problems.