Monte-Carlo Graph Search from First Principles
Monte Carlo Graph Search from First Principles, David J Wu
Monte-Carlo Tree Search (MCTS) except applied to directed graphs instead of trees - "Monte-Carlo Graph Search" ("MCGS") - is sometimes considered to be pretty tricky to implement in a sound way.
Explains several ways that MCTS, applied to graphs, can be very challenging to implement. They do so in a way that even a fairly naïve reader such as myself can understand, with excellent graphics.
Includes python psuedocode, which helps the literal-minded such as myself.
I used to care a great deal about MCTS, and wanted to go to grad school with the folks who invented it. Fortunately or unfortunately, that fork in my life wasn't taken, but I still like to take a peek into the field every once in a while.