No, the Chiefs' blocked field goal against the Broncos was not an illegal play
On the play final of a 16-14 win over the Denver Broncos on Sunday, the Kansas City Chiefs blocked a 35-yard field goal attempt to seal the game. The Chiefs stacked six players on one side of the long snapper at the line of scrimmage and overloaded offensive lineman Alex Forsyth, who was overpowered and fell backward, allowing the block.