Environment for AlphaZero

[pat-coady]

Thanks for posting this code. I'm thinking of using this as checkers environment for an implementation of AlphaZero agent I'm working on.

1. As far as you know, does this environment correctly implement all the rules?

2. Regarding the agent, I've always been terrible at checkers and haven't played since I was a kid. I beat the agent on my first try. Should it be relatively strong? Perhaps I got lucky.

Thanks a lot, Pat