The NFL changed its overtime rules for the playoffs three years ago. Here's how it might affect the Philadelphia Eagles and Kansas City Chiefs in Super Bowl LIX.

According to the official NFL website, overtime rules for postseason games are as follows: In overtime, play will continue regardless of how many overtime periods are needed. There will be a two-minute intermission between each overtime period. There will not be a halftime intermission after the second period.

The captain who lost the first overtime coin toss will either choose to possess the ball or select which goal his team will defend, unless the team that won the coin toss deferred that choice. Each team will have an opportunity to possess the ball in overtime.

Overtime is looking unlikely at this point, but Fox had been ready to pounce if the game had gone into extra time and generated an ad windfall. Advertisers had already spoken for much of the ad time in a hypothetical overtime ahead of the game,