At this point, our game is fully usable. Users can add `X`s and `O`s and can see for themselves who has won or not. However, this is a computer game now and it should be programmed to determine who the winner is algorithmically. Breaking down the problem of tic-tac-toe, one will realize that there are only 8 winning conditions in the game. We can create a handful of functions that will `checkForWin` when a square is clicked. Once we have determined the winner, we can update the UI to announce that to the users.