Three teams submit overtime rule change proposals to NFL
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NFL owners approve new overtime rules, but for only the postseason
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NFL approves 2 rule changes; postseason OT altered
Contradictory rules under consideration could turn 10-minute overtime into a 5-minute egg – Football Zebras
American football rules - Wikipedia
Three teams submit overtime rule change proposals to NFL
NFL approves 2 rule changes; postseason OT altered
Scorecard of the 2021 NFL rules meetings [live updates] – Football Zebras