The tuck rule, the once-obscure-but-much-debated regulation that helped the New England Patriots go to the Super Bowl in 2001, could disappear. Instant replay, which already interrupts the game more times than the Steelers would care to see, could be amended so that a coach without a challenge could still manage to have a play reviewed. And defenses probably will be glad to know that running backs such as Adrian Peterson soon may be punished for leading with the crown of their helmet, instead of the other way around. Those are some of the several rule proposals that could be adopted this week when the National Football League owners convene for their annual meeting, which begins today. The tuck rule, though, probably will draw the most attention. It is one of six proposed rule changes from the league's competition committee that may be abandoned.