In Robert van Gulik’s book The Chinese Lake Murders go plays a crucial role in solving a crime. In this book there is a diagram with a go problem (chapter 5). Actually it is not really a problem, but a code that opens a hidden lock, that leads to a secret hideaway. Here Judge Dee finds the evidence he needs to solve this mystery.
In this chapter there are also some interesting observations on the game of go.
In the view of another thread I am wondering whether this is a non-go book or not.