Super Bowl: How does overtime work under the new NFL rules?

This was just the second overtime in Super Bowl history and the first under the NFL's new rules. (Michael Reaves/Getty Images)

The Super Bowl went to overtime for just the second time in the game's history on Sunday.

The Kansas City Chiefs beat the San Francisco 49ers 25-22 at Allegiant Stadium in Las Vegas to claim Super Bowl LVIII. The game was tied 19-19 at the end of regulation, thanks to a late field goal from Harrison Butker, which sent it into overtime. While that's incredibly rare on its own, the game was also the first under the NFL's new postseason overtime rules.

Under the new rules, both teams get at least one possession in overtime, regardless of whether the team that gets the ball first scores. If the score is still tied after each team gets the ball once, the next score wins. The only way the game would end after one possession is if the kicking team forces a safety on the initial possession.

The 49ers won the coin toss and opted to receive and take the ball first. They made it down into the red zone, but their drive stalled, and they kicked a field goal. That put them up 22-19 and gave the ball to the Chiefs.

Chiefs quarterback Patrick Mahomes then hit Mecole Hardman for a touchdown to grab the 25-22 win.

That marked their second straight Super Bowl victory.