The Kansas City Chiefs got off to a good start after they forced the Denver Broncos to punt. This was followed with a 65-yard run by Larry Johnson to set up a 23-yard field goal kick by Nick Novak, putting the Chiefs on top 3-0. After recovering an Eddie Royal fumble early on Denver's next drive, Kansas City again failed to make it to the end zone and a 21-yard field goal by Novak put the Chiefs up 6-0. The Broncos responded with an 8-play, 9-minute drive in the second quarter that ended in a touchdown pass from Jay Cutler to Brandon Marshall, putting the Broncos briefly in the lead, 7-6. Later in the quarter, a fumble by Marshall was returned to the Broncos' 2-yard line by the Chiefs, followed 2 plays later by a Johnson touchdown run, putting the Chiefs up 13-7. The Broncos got the ball back, but a 28-yard field goal by Matt Prater went wide right. After forcing the Chiefs to punt, the Broncos got the ball back and Prater hit a 56-yarder near the end of the half, drawing the Broncos within 13-10. The second half began with a Denver drive that resulted in a 51-yard Prater field goal, tying the game at 13-13. The Chiefs answered with a 43-yard Novak field goal, putting them back on top 16-13. On the next drive, Cutler threw an interception. However, Kansas City's very next play was a Larry Johnson fumble recovered by Denver, although 2 plays later Cutler threw another interception. Despite this exchange of turnovers (3 turnovers in 4 plays), there was no scoring for the rest of the 3rd quarter. Early in the fourth quarter, the Chiefs extended their lead to 23-13 with a 10-yard touchdown pass from Damon Huard to Tony Gonzalez. The Broncos, however, failed to capitalize on a sustained 16-play, 75-yard drive and settled with a Prater field goal, cutting the lead to 23-16. The Chiefs and Broncos then each got field goals on their next drives, bringing the score to 26-16. The Chiefs got a good return after the Prater field goal and put the game away with a 16-yard touchdown run from Johnson. With the 33-19 victory, the Chiefs snapped a league-leading 12-game losing streak dating back to week 7 of the 2007 season. Larry Johnson carried the Chiefs with 198 rushing yards and 2 touchdowns. Huard managed the game well for the Chiefs, throwing 21/28 for 160 yards and 1 touchdown. Denver was hurt by 4 turnovers compared to just 1 for the Chiefs, but despite 2 interceptions, Cutler still was able to throw for 361 yards on 29/49 passing.
Question: How many points did the Chiefs extend their lead in the fourth quarter?
Answer: 10