Bills Upset Chiefs, Keeping 1972 Dolphins' Undefeated Record Intact
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- Buffalo Bills beat Kansas City Chiefs 30-21 on Sunday.
- Chiefs suffer first loss, Dolphins' 1972 perfect season remains.
- Josh Allen leads Bills with 262 passing and 55 rushing yards.
- Allen's crucial 26-yard TD run seals win against Chiefs.
- Bills' defense limits Chiefs to 259 total offensive yards.
- Patrick Mahomes struggles against Buffalo's strong defense.
- Bills eye playoffs with Allen's impressive performance.