And on Sunday, they took a 9-3 halftime lead despite gaining just 49 yards, fell behind by eight points with three minutes to go, and rallied to topple the defending Super Bowl champion Broncos (7-4) by scoring on their last three possessions. It was the type of victory that can define a season, and it kept Kansas City a game behind the Oakland Raiders (9-2) -- a team it defeated, 26-10, in mid-October. The Chiefs will host rematches with both AFC West rivals in December, and if they keep winning, they could also challenge the Patriots (9-2) for the No. 1 seed in the conference.