anchor.diff:  |creator|string| ID of the gamer who created the game (read only)
   |custom_properties|json| freeform JSON containing the user properties of the match
   |description|string| description of the game (non localized)
  -|last_move_id|string| ID of the last move, which must be passed by any player who wishes to make a move (read only)
  +|last_event_id|string| ID of the last event, which must be passed by any player who wishes to make a move (read only)
   |match_id|string| ID of the match, keep it safe to allow for joining it or fetching it later (read only)
   |max_players|number| maximum number of players who can join this game
   |moves|json| list of pending moves, cleared whenever a global_state is posted along with a move by one of the players (read only)
  
positive.code:                     "54744d9fad0f8b6b62e3b58a"
                  ],
                  "global_state": {},
                  "last_move_id": 0,
                  "events": [],
                  "match_id": "54744d9fad0f8b6b62e3b58b"
              }
  
negative.code:                         "547447bce0d4d97c5ead8aad"
                      ],
                      "global_state": {},
                      "last_event_id": 0,
                      "events": [],
                      "match_id": "547447bde0d4d97c5ead8aaf"
                  }
  