The Kansas City Chiefs are back-to-back Super Bowl champions after they beat the San Francisco 49ers 25-22 on Sunday. The NFL’s first Super Bowl in Las Vegas was a sloppy, mistake-filled affair that was mostly boring until the back-and-forth fourth quarter and overtime. It was the second of 58 Super Bowls to be tied after regulation, and the first played under new overtime rules that ensured both teams got the ball. The winning moment came with 3 seconds left in overtime when Patrick Mahomes threw a 3-yard touchdown pass to Mecole Hardman. This gave the Chiefs their third title in five years a…