Buffalo Bills quarterback Josh Allen (17) celebrates after scoring against Kansas City on Sunday in Orchard Park. N.Y.

Josh Allen threw a touchdown pass and ran for two scores to outduel Patrick Mahomes and the Buffalo Bills defeated the Kansas City Chiefs 28-21 on Sunday in a rematch of last season’s AFC championship game.

James Cook had 114 yards rushing and Buffalo’s defence did the rest in harassing Mahomes, who was sacked three times, hit 15 more and finished with the worst completion percentage of his career.

The game was decided in the final 17 seconds, when Mahomes threw three straight incompletions from Buffalo’s 40. The last throw fell short of the end zone and was batted down by rookie Maxwell Hairston. The drive began at Kansas City’s 42 after Matt Prater’s 52-yard field goa

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