1) There are no more tiles to select from. Each tile has already been selected, indicated by a □ mark. The game usually ends this way.
2) A player moves in such a way to leave his opponent with no possible moves in that row or column. Since the opponent cannot make a move, the game is ended and the player with the most points wins.
This strategy is good to use when you are ahead in points and you want to end the game early and win. Of course you could do this if you were behind in points but you would lose and it would be stupid.
