LAS VEGAS (Reuters) -Patrick Mahomes threw a touchdown pass to Mecole Hardman in overtime to give the Kansas City Chiefs a 25-22 win over the San Francisco 49ers in a 'Sin City' Super Bowl thriller on Sunday, cementing their status as an NFL dynasty. The blockbuster finish in Las Vegas was worthy of the biggest show on the Strip, as the Chiefs won a third Super Bowl in five years and became the NFL's first repeat champions since the New England Patriots in February 2005.