impossible-tic-tac-toe

How it works:

1. The middle box is marked as X to make this game impossible
2. When the player places a mark, the computer checks if there are any rows without player's mark, AND includes computer's mark, this provides the computer the fastest step to winning
3. The computer checks whether or not it is winning, if so, the computer will place a mark to win the game
4. If the computer is not winning, and the player is winning, the computer will place a mark to prevent the player from winning
5. A code will check for the winner every time after player places a mark. Either win, loss or tie, the game will end and neither of them can place a mark
6. A message will pop up indicating win, loss or tie.