Norwegian grandmaster Magnus Carlsen has defended his chess world championship title by beating American challenger Fabiano Caruana 3-0 in rapid tiebreaker games.
After their three-week match ended in 12 draws, Carlsen wrapped up the victory quickly Wednesday with three straight wins to build an unassailable lead in the best-of-four rapid format. The tiebreakers were played with 25 minutes for each player per game, while the 12 previous classical-style games lasted up to seven hours each.
It's the third time the 27-year-old Carlsen has successfully defended his title after winning it from Viswanathan Anand of India in 2013.
Caruana, 26, was trying to become the first American since Bobby Fischer in 1972 to become the chess world champion.
Carlsen pockets 550,000 euros ($621,000) for the win while Caruana gets 450,000 euros ($508,000).
The fearless performance will go a long way to cementing his claim to be history's greatest player — a title some still award to Soviet-Russian legend Garry Kasparov.
Kasparov himself appeared in awe of Carlsen's display in a format that has seen many grandmasters before him wilt under the mental strain.
"Carlsen's consistent level of play in rapid chess is phenomenal," Kasparov tweeted.
"We all play worse as we play faster and faster, but his ratio may be the smallest ever, perhaps only a 15 percent drop off. Huge advantage in this format."
The games marked a complete departure from the string of draws played out in their original 12-match series which began on November 9.
Yet those tense tugs of war were a testament to the prodigious skills of the American Italian.
The first U.S. contender since Bobby Fischer beat the Soviet Union's Boris Spassky at height of the Cold War in 1972 is the game's second-ranked player.
Caruana has spent most of his career in Carlsen's shadow but is rated only three points below the Norwegian's leading 2,835 points.
Chess experts said Carlsen appeared to be rattled by the Miami-born yoga lover in a memorable game 10.
Carlsen was only too happy to agree to draws in the final two matches -- the last one from a winning position that saw Kasparov shake his head in disbelief.
"In light of this shocking draw offer from Magnus in a superior position with more time, I reconsider my evaluation of him being the favorite in rapids," Kasparov tweeted after Monday's match.
"Tiebreaks require tremendous nerves and he seems to be losing his."
But Carlsen seemed determined to decide things in Wednesday's rapid-chess tiebreakers — a format that saw him beat Sergey Karjakin in the 2016 title match in New York.
Caruana admitted that he was "relieved" to still be in the contest after Monday's 12-match scare.
"I'm mainly relieved. When you feel like you're sort of on the brink of defeat, or at least you have a very dangerous position, then of course it's quite good."
But Carlson never appeared to lose faith in skills that saw him dubbed the "Mozart of chess" by The Washington Post after becoming a grandmaster at the age of 13.
"I think I have very good chances," Carlsen told reporters after Monday's game.