Very fun ! I've been trying to lose to the Copy Cat bot, and I've failed 3 out of 3 attempts... However, I did manage 2 stalemates, and 1 draw by repetition, and the official stats record that as 3 draws 3 losses.. So I guess that counts?
Side note, I've also been trying out a game that has a demo in Steam called Master of Chess, also written in Godot I believe - pretty cool concept as well.