What season in the National Football League was the New England Patriots when they beat the Kansas City Chiefs 27-20 in the divisional round?
2015 Kansas City Chiefs season:  The following week, they were defeated by the New England Patriots in the Divisional round by a score of 27–20. 2015 New England Patriots season: The New England Patriots season was the franchise's 46th season in the National Football League, the 56th overall and the 16th under head coach Bill Belichick.
46th season