The Kansas City Chiefs are trying to do something no team has ever done: win three straight Super Bowls.
The rest of the NFL is trying to stop them.
Here are the key elements of the Chiefs' success, which will again play a role in their quest — and could provide clues to how other teams can unseat the kings of the NFL.
The Kansas City Chiefs' offense was inconsistent last year. Sure, the Chiefs won the Super Bowl and finished in the top-10 in all the underlying metrics and Patrick Mahomes was still Patrick Mahomes.