The rules are easy. While watching a baseball game on TV, you have to drink one beer an inning. The beer must be started and finished during the inning. If you fail to finish your beer before the inning is over, you have to chug a beer during the break.
The key is to properly pace yourself during each inning, so that you don't have to quickly chug towards the end of a fast inning.
For a Deadly Buzz Factor, play this game during a double header.