Early on, the 49ers dominated possession. Quarterback, Jimmy Garoppolo made the first mistake when he threw up the ball under a heavy rush and it was intercepted. But the 49ers returned with a drive and scored on a catch-and-run by the tough fullback Kyle Juszczyk.

Headliners, Shakira and Jennifer Lopez infused Latin pride into an electric halftime show. Fellow Latin artists, Bad Bunny and J Balvin were also brought on stage. Shakira danced through her discography, including “Whenever, Wherever,” from her breakout English-language album Laundry Service that introduced the native Colombian to a wider American market. Lopez trotted out a medley of her hits, including “Jenny from the Block.” The New Yorker, born to Puerto Rican parents, honored her heritage by wrapping herself in a flamboyant flag (half American, half Puerto Rican) while belting out a verse from Springsteen’s “Born in the USA.”

Most of the advertisement chatter involved a commercial for Hulu Live starring Tom Brady. Strolling the turf at Gillette Stadium, the Patriots star was, by all appearances, announcing his retirement. By the final quarter, Brady, looking reflective in a black turtleneck, had punked fans. And Hulu emerged victorious.

The pace started to pick up after the third quarter, with the 49ers outplaying Kansas City on offense and defense. But it wasn’t good enough. With six minutes left in the fourth quarter, the Chiefs were down 20-10. It didn’t seem to bother Mahomes, who time and time again has found a way to bring his team back from a deficit. The Chiefs stormed back, scoring 21 unanswered points to stop the 49ers. It was the third time these playoffs that Mahomes engineered a double-digit comeback in a single postseason the first time that’s ever happened.

Mahomes, 24, became the youngest quarterback named Super Bowl most valuable player, one year after he had become the youngest player named league M.V.P. The win gave Coach, Andy Reid his first championship after a long career defined by teams that were always good but could never quite get to the top. A Super Bowl champion as an assistant coach with Green Bay, he led the Philadelphia Eagles to the Super Bowl after the 2004 season as a head coach but lost the game to the New England Patriots. The Chiefs are Super Bowl champions because they eschewed balance and put the game in the hands of their quarterback when it mattered most.