Why did the broncos play the colts twice in 1983?

The Denver Broncos and Indianapolis Colts played twice in 1983 due to the NFL's scheduling format at the time, which included a division rivalry game and a regular season matchup. Both teams were part of the AFC, and the Broncos faced the Colts in their regular season as well as in a playoff game, known as the AFC Wild Card Game. This setup allowed for teams to meet more than once in a season, especially if they were in the playoff picture.