The return of King Patrick Mahomes causes the Kansas City Chiefs to win the Super Bowl

MIAMI Patrick Mahomes drove an exciting late comeback as the Kansas City Chiefs ended his 50-year wait for a Super bowl crown with a 31-20 victory over the San Francisco 49ers on Sunday.

Chiefs Field Marshal Mahomes ignored a start full of errors to nullify a 20-10 deficit in the fourth quarter in a battle for the Vince Lombardi trophy at Hard Rock Stadium.

The Super bowl win was Kansas City's first NFL Championship since his triumph over the Minnesota Vikings in 1970.

And he owed everything to Mahomes' nerve, who for the third consecutive postseason game led the Chiefs back from a double-digit deficit to seal a dramatic victory.

"We never lost faith. Everybody on this team, no one had their head down and we found a way to win in the end," said Mahomes, shortly before being anointed Super bowl MVP.

The Chief Marshal of the Chiefs had been out of place until the beginning of the fourth quarter, throwing two interceptions at the fierce pressure of the magnificent San Francisco defense led by marauder Nick Bosa.

But with the game in play in the last quarter, Mahomes led his team on two long runs to set touchdowns for tight end Travis Kelce and runner Damien Williams.

Those scores put the Chiefs in a 24-20 lead and Kansas City secured the game when Williams danced on the bench for a score of 38 yards on the ground with 1 minute and 12 seconds remaining.

Mahomes finished with 286 aerial yards and 26 completions of 42 attempts with two touchdowns. The Chief Marshal also rushed to a touchdown early in the first quarter.

But the defeat was desperately tough for the 49ers, who were chasing a sixth Vince Lombardi trophy.

The 49ers had barely set a wrong foot in three quarters, with their defense chaining Mahomes superbly and their offensive moved the ball with confidence to put them in the driver's seat at the end of the game.

They have an incredible defense, Mahomes said later. We weren't running at a high enough level, and when you play a defense like that, you're not going to succeed.

But as pressure increased in the last quarter, 49ers quarterback Jimmy Garoppolo's sure touch left him and the Niners' offense ran out.

With Mahomes leading the Chiefs on two long runs to design a 24-20 lead, Garoppolo had one last chance to lead the 49ers in a game-winning run with 2min 44sec remaining.

But the Chiefs' defense suddenly began to find gaps to pressure Garoppolo, and when he was fired on 4 and 10 to return possession to Kansas City, the deed was on the wall.

Two plays later, Williams then nailed the last nail into the 49ers coffin, finding space in the left hand line and galloping towards the end zone to get a score to be 31-20.

Garoppolo was intercepted in the 49ers' next possession and Kansas City was allowed to run the clock in search of victory.

The win was a long-awaited first Super bowl triumph for Chiefs head coach Andy Reid, the 61-year-old veteran long regarded as the best NFL coach not to win a championship.

But the fourth quarter collapse was cruel to 49ers coach Kyle Shanahan.

Shanahan had been the offensive co-ordinator for the Atlanta Falcons at the 2017 Super bowl when they let a 28-3 lead slip in a stunning loss to the New England Patriots.

The fourth quarter drama came after a three quarter opening with little to choose between the two sides.

Mahomes' quick touchdown in the first quarter and a Harrison Butker field goal had helped Kansas City have an early 10-3 lead.

But Garoppolo found Kyle Juszczyk for a 15-yard touchdown in the second quarter to reach 10-10 at halftime.

A field goal by Robbie Gould and a touchdown by Raheem Mostert runner helped put the 49ers 20-10 ahead and the momentum seemed to have been decisive in favor of San Francisco.

At that time, Mahomes had been out of color for much of the game, throwing two unusually neglected interceptions while the Chiefs struggled to generate momentum.

But once again, the ability of the Chiefs to score quickly came to their rescue.

Mahomes hit receiver Tyreek Hill for 44 yards on the road that led to Kelce's touchdown to make it 20-17.

Another 38-yard finish for Sammy Watkins in the next Chiefs drive led to the touchdown lead for Williams and a crucial 24-20 lead.