A thrilling NFL rivalry delivers another tight game—and an impressive win for the Bills, who are still searching for a playoff breakthrough.

The Kansas City Chiefs are no longer unbeaten, but they didn't seem much bothered by that, least of all quarterback Patrick Mahomes. "The undefeated thing was cool," Mahomes said after the Chiefs took their first loss of the season 30-21 against the Buffalo Bills on Sunday.

The Kansas City Chiefs are down a kicker, which no one should take for granted in a Chiefs-Bills game. The Chiefs secured a win in the last meeting on a missed field goal and sent the 13-seconds game to overtime on a last-second regulation kick.