Let’s jump in with the rules, via the NFL’s Football Operations site: If the score is still tied at the end of an overtime period — or if the second team’s initial possession has not ended — the teams will play another overtime period. Play will continue regardless of how many overtime periods are needed for a winner to be determined.

NFL fans witnessed something never seen before. A lead change on the final play of the Super Bowl. The reason? Super Bowl LVIII became the first playoff game under the league’s new overtime rules for the postseason,

The road to Super Bowl LIX kicks off for 12 of the 14 NFL postseason participants on wild-card weekend . Only the Kansas City Chiefs and Detroit Lions

The NFL told teams this week that its sportsmanship-related rules will be “strictly enforced” during the postseason. That message was delivered in a Wednesday memo from Perry Fewell, the league’s senior vice president of officiating communications and administration, to general managers and head coaches.

Here’s how overtime works in the postseason, according to the NFL rulebook: Overtime comes into play if both teams are tied by the end of the fourth quarter. After a three minute intermission (or less), an extra 15 minutes will be added to the clock — instead of the typical 10 minutes fans see in the regular season.

The controversial overtime matchup between the Bills and Chiefs two seasons ago was a key motivator for the new postseason overtime rules.

The NFL playoffs are underway. Here is the full bracket, plus the matchups and the schedule as the divisional round approaches.