Interesting idea! I have two questions:
Firstly, I'm curious how you implemented the chess computer. Was it something you had to manually intervene to implement or is there some library doing it for you?
Secondly, I wonder had you ever thought of implementing new pieces maybe. To me when I hear a war-themed chess game in three eras i thought it would be a cool idea to build on the mechanics of chess maybe, like in WW1 having some squares be trenches or having some aerial pieces in WW2.