Has anyone noticed the Ludii General Game System at https://ludii.games? It's related to the Digital Ludeme Project, http://ludeme.eu/project/index.html, which seeks to reconstruct the rules of ancient games.
At the Ludii Portal you can download the Ludii Player and instructions for coding the rules of new games. The Ludii Player can then play the game using e.g. MCTT search. This seems like a great tool for us.