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Instead of just looking at the number of comebacks, Kacsmar decided to look at the percentage of comeback opportunities won. (See his exhaustive treatise on the subject here.) His definition of a comeback opportunity: Any time a quarterback takes the field late in the fourth quarter facing a deficit of between 1 and 8 points. Kacsmar is quick to point out that even this method of calculating comebacks has its flaws. A QB may lead a drive late that puts his team ahead only to have his defense give up a game-losing score. Or, a quarterback may be put in an impossible situation, like getting the ball on his own 20-yard line for a potential game-winning drive with only one second on the clock.