On Thanksgiving, the Chiefs played their modern-day rivals, the Denver Broncos.  The game was broadcast on the NFL Network as part of the NFL's new "Thanksgiving Tripleheader" tradition, set to kick off the NFL Network's broadcasts of Thursday and Saturday Night Football.  The game also aired on Denver and Kansas City local television--KDVR-Fox 31 in Denver and WDAF-Fox 4 in Kansas City at 7pm Kansas City time. The game was broadcast on Westwood One radio. The game marked the first time in NFL history that the league played a triple-header on the holiday, and it was also the first Thanksgiving prime-time game. After John Fogerty played at halftime, the Chiefs showed their own explosive firepower.  A big gain by Samie Parker for 31-yards set up another field goal by Lawrence Tynes from 34&#160;yards out.  The Broncos fought back on their next possession.  It appeared the Plummer threw his second interception of the game when Patrick Surtain intercepted a ball intended for Javon Walker, but a penalty on Lenny Walls reversed the call.  The Chiefs led 13-10. A defensive battle ensued in the fourth quarter, as the Broncos and Chiefs' defense held each other from scoring again.  At the 30-yard line, a pass from Trent Green was intercepted by Darrent Williams, intended for Samie Parker.  The Chiefs regained possession at 8:00 left in the game.  The Chiefs secured the win The game ball was given to Chiefs founder Lamar Hunt, who lobbied for 37-years to put a Thanksgiving game in Kansas City.  The 74-year-old Hunt, who missed only a handful of games since founding the franchise, was admitted to a Dallas-area hospital on Wednesday, bitterly disappointed he would not see Kansas City's inaugurating the NFL's new Thanksgiving tripleheader. Making the night even more festive was an in-house standing-room-only crowd of 80,866, the largest since 1972 (the year Arrowhead Stadium opened).
How many points were the Chief's ahead by at the beginning of the 4th quarter?
3