{
  id: 0,           // game id
  state: "ended",  // "waiting", "playing", "ended"
  grid: [          // the nine game grid cells
    "X",
    " ",
    " ",
    "X",
    "O",
    " ",
    "X",
    "O",
    " "
  ],
  winner: "X",     // the player who won, if there is one.
  player: "X",     // the user's color
  next: "O"        // the color of the player next in turn
}