Refactor

Change-Id: Ie8223c846035a0f3670bd6ce1f9d6cefe2463fa9
Show the board to players

Change-Id: Id86ffdfa91f61251cfea9da2225c7ad0c83f76c4
Accept input from players

Change-Id: I6bde1bb72cde28febdfd0b81b07d11c208fd535c
Play games!

Change-Id: Ib18e57a7297014b36a171546eae697b0df062070