KANSAS CITY, Mo. – Patrick Mahomes threw for 318 yards and a touchdown, Harrison Butker was perfect on five field goals, and the Kansas City Chiefs overcame some red-zone woes and big mistakes that cost them two more scores to hold off the Denver Broncos 22-16 on Sunday night.Travis Kelce had eight receptions for 136 yards and the go-ahead TD grab late in the third quarter, and Tyrann Mathieu twice picked off Broncos quarterback Drew Lock — the second with 24 seconds left to seal the win — as the Chiefs clinched a playoff berth by improving to 11-1 for the second time in franchise history.It took some defense to do it.The Broncos (4-8) forced the Chiefs to punt after a holding call wiped out Tyreek Hill's 48-yard touchdown reception — he.