It's a cliché in football that every fan thinks he's a coach. Now there's a computer that thinks it's a coach. Indiana University scientist Chuck Bower and two partners have created ZEUS, a computer model of football as it's played in the National Football League, based on years of NFL statistics. ZEUS runs on an off-the-shelf laptop, perfect for a football sideline or a coach's booth, and it does what a coach needs to do during a game but can't -- calculate the consequences of a decision before he calls the next play.