I am trying to write a game where there is 13 stones and you play against the computer to make sure that you don't take the last stone. You or the computer (depending on the turn) is allowed to take 1, 2, or 3 stones during their turn.

I am kind of lost at the moment. I have several methods and I want to send several things between them. One is who is playing and the other is how many stones there are left. I am also not sure if I...