<P> If the game is in sudden death overtime, the extra-point attempt is omitted if the winning score is a touchdown . In American high school and college football, it is likewise omitted following a touchdown on the game's final play if a successful conversion attempt cannot change the outcome of the game . </P> <P> There is, however, one notable exception in college football because the defense can also score two points on a return of a conversion try (and theoretically score a one - point safety) and the NCAA rules state that the conversion try must be run if any subsequent scoring on the play could impact the outcome of the game . Therefore, if a team scores to take the lead by one or two points as time expires, they must still attempt the conversion, although most teams will simply opt to take a knee to prevent the risk of the defense scoring . For example, on October 24, 2009, Iowa scored as time expired to take a 15--13 lead over Michigan State . Making the conversion would have made no difference in Iowa winning the game, but Iowa still had to attempt it, so Ricky Stanzi simply knelt down, as a return by Michigan State would have tied the game and forced overtime . </P> <P> In Canadian football, the scoring team is entitled to a conversion play after scoring with no time on the clock, but may choose to waive it if they feel it is not needed . Because head - to - head points scored is used as a tiebreaker in the standings between teams, they often choose to take it if is against a division opponent with whom a tie in the standings is possible . As in U.S. college football, Canadian football allows defenses to score two points for the successful return of a convert attempt . </P> <P> The CFL and NFL both implemented major changes to how conversions were attempted starting with their respective 2015 seasons . </P>

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