Does a divorce occur with the statement "Divorce upon me, she is not entering" in the context of a computer football game, and what is the ruling on playing again and scoring goals?

You have been absolved from your oath, and your divorce did not occur when your brother scored the goal, because your oath was contingent upon you scoring a goal. If you play again and put the ball in the net, divorce will not occur, because your oath was specific to that one instance only. You should refrain from swearing by divorce.