After the first pitch, runner should have gotten in a pickle between home and 3rd. Put pressure on the defense to execute. If she gets out then it's still a tie. If she scores, then you Win.90 minutes drop dead and an elaborate plan to get an extra run on the last batter. What did you do with the other 89 1/2 minutes of play?
But yeah, drop dead should be used for games that don't count. Showcases or pool games.