Alex Smith tossed a pair of touchdown passes as the Chiefs edged the Cowboys 17-16 on Sunday.
The Chiefs' new starting quarterback continued to show little resemblance to last year's scoring attack, leading his team on a 13-play, 77-yard opening drive capped off by a two-yard touchdown pass to Jamaal Charles. Much of the damage was done with Smith on the run as he led Kansas City (2-0) with 57 yards rushing.
He completed 21 of 36 passes for 223 yards and two scores.
The Cowboys (1-1) had to deal with a loud Arrowhead Stadium atmosphere as well as poor field position. Dustin Colquitt punted seven times, averaging just under 44 yards per punt and pinned Dallas within their own 10-yard line several times.
Dallas' offense managed to stretch the Chiefs secondary in the first half with Dez Bryant, who racked up 100 yards and a touchdown reception in the first quarter alone.
The Cowboys took a 13-7 lead at the 6:54 mark in the third quarter with Dan Bailey's second field goal of the afternoon.
Smith and the Chiefs offense struggled after their first drive as the offensive line gave up four sacks. Left tackle Branden Albert also briefly left the game with a left shoulder injury. The offense managed to march down the field late in the third quarter as Smith connected with Dwayne Bowe on a 12-yard strike to retake the lead.
Kansas City's defense continued to get into the backfield, sacking Romo three times. Dontari Poe recorded a pair of them, while the entire unit forced a pair of turnovers.
Romo finished 30 of 42 for 298 yards and a touchdown.
Both Bailey and Ryan Succop added field goals in the fourth quarter to make it 17-16, while Dallas' last possession began at their own four-yard line with just 16 seconds to play and no timeouts.