On March 4, 2021, the Chiefs announced that they had officially renamed
Arrowhead Stadium, GEHA Field at Arrowhead Stadium. The Chiefs lost two of their longest tenured players in the offseason. Tackle
Eric Fisher was released and fullback
Anthony Sherman retired. Both players joined the Chiefs in 2013. In the offseason, the Chiefs announced they would once again retire their live horse mascot
Warpaint to continue with their commitment to stop using Native American imagery. . The Chiefs opened the season on September 12 with a 33–29 victory over the
Cleveland Browns. The win was the Chiefs' 15th consecutive win in September. The Chiefs would lose their next two games to give them a 1–2 record after three games, which was their first losing record in 89 games, dating back to week 10 of the
2015 season. The Chiefs' 20–38 week 5 loss to the
Buffalo Bills, was the Chiefs' first double-digit loss in the regular season since
2017 and the Chiefs' first double-digit loss at home since
2014. In Week 7, the Chiefs lost 3–27 to the
Tennessee Titans, which is the fewest points scored in a game since Patrick Mahomes became the quarterback. The Chiefs maintained a non-winning record until a week 9 victory over the
Green Bay Packers. That 7-week stretch without a winning record was the Chiefs' longest stretch without a winning record since
2012 when they held a losing record the entire season. After starting the season 3–4, the Chiefs won their ninth game in week 14 over the
Las Vegas Raiders clinching their ninth consecutive winning season, one short of the franchise record of 10. The 48–9 victory over the Raiders was the largest in franchise history over the Raiders and the largest victory against any opponent since the
2006 season. In week 16, following a 36–10 victory over the Steelers and a loss by the Chargers, the Chiefs clinched their sixth consecutive AFC West division championship and their franchise record seventh straight playoff berth. The Chiefs finished the regular season 12–5, their fourth consecutive 12-win season, all four since
Patrick Mahomes became the starting quarterback. Kansas City defeated the
Pittsburgh Steelers 42–21 in the Wild Card round of the
2021–22 NFL playoffs. They would then host Buffalo in the Divisional round,
winning that game 42–36 in overtime. This game was hailed as one of the greatest modern NFL playoff games, with both teams combining for 25 points in the final two minutes of regulation. The following week, despite being favored to win the AFC Championship game, the Chiefs would lose the game in an upset to the Bengals in overtime 24–27, a game in which they led 21–3 at one point in the second quarter. ==
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