Chess Grandmaster Garry Kasparov is coming out of a 12-year retirement to compete.

Kasparov, who became the youngest world champion ever at age 22 in 1985, is now 54, more than a decade past the age when professional chess players typically retire.

In a move electrifying the world of chess, former world champion Garry Kasparov is coming out of a 12-year retirement Monday to take on a new generation of players who have long worshiped him as the closest thing to a "chess god."

Kasparov utterly dominated the sport from 1985 to 2000. Since his withdrawal from a tournament in Linares, Spain in March 2005, the Russian's absence has left many chess fanatics feeling orphaned.

So there was considerable surprise when he agreed to play in the new Rapid and Blitz tournament in St. Louis, Missouri, which follows closely after the annual Sinquefield Cup competition, a major stop on the world tour, in the same city on the Mississippi River.

Kasparov, who became the youngest world champion ever at age 22 in 1985, is now 54, more than a decade past the age when professional chess players typically retire.

From Monday to Saturday, the Russian will put aside the business that has kept him busy in retirement his vocal and determined opposition to President Vladimir Putin to play against some of chess's big guns, like fellow Russian Sergey Karjakin.

The world's current No. 1 player, Magnus Carlsen of Norway, will not be there, however.

Still, the return to competition of the Azerbaijan-born Kasparov a man once dubbed the "Beast of Baku," whose epic clashes with Anatoli Karpov are part of chess legend has had an explosive impact in the chess world, particularly in St. Louis.

-  'To see this dude play'  -

"Everyone is talking about it," American chess grandmaster Alejandro Ramirez said. "People are flying from India and China to see this dude play."

Kasparov's long and "unparalleled" dominance of the chess world made him "a cultural icon," said Ramirez, a US Open champion who coaches the chess team at Saint Louis University.

The younger generation, which Ramirez sees emerging almost by the day, "certainly looks up to him," he said. "His contribution to chess theory and our understanding of the game resonate still today."

But what are Kasparov's realistic chances after so many years away from the grueling competition of professional chess?

The man himself dodged the question in his only tweet mentioning his comeback: "Looks like I'm going to raise the average age of the field and lower the average rating!" he quipped, in a bit of self-deprecating humor.

"Garry Kasparov has always had a fighting spirit second to none, and he is extremely competitive," Ramirez said. "But he is still going to be facing very stiff competition," including "some of the best of the best of the world."

The high-pressure, speed-chess format of the St. Louis tournament, where players are forced to make their moves far more rapidly than during normal competitions, could be tough on the graying Kasparov, as he takes on much younger players who specialize in that approach.

"I expect him to be fighting for the top spots, but I would be surprised if he wins it all," said Ramirez, 29, who became a grandmaster at age 15.

-  His 'incredible aura'  -

But in a tournament that will include four of the world's top 10 players, Kasparov is not expected to be a pushover, said Sylvain Ravot of France, who has a master rating.

"His sense of the game, his passion for winning, his experience and his reflexes should all help him do well, perhaps even land in the top three, even if it will be much harder for him," Ravot said in an interview, while emphasizing Kasparov's "incredible aura."

Accustomed to being a step ahead of the field, the Russian "chose the venue well more or less within his reach for his comeback," Ravot said, adding that the mere fact of Kasparov's return might be more important than his actual performance.

"It's a bit like Pete Sampras making a comeback" to tennis, he said.

Kasparov would appear to be motivated more by love of the game than anything else, though the winner's purse in St. Louis is a not-paltry $150,000.

"It's not even clear that he wants to play again after St. Louis," the French expert said.

Kasparov did in fact return to the game, though only in informal capacity, in 2015. He played a friendly match against Nigel Short 10 years after formally bowing out of professional competition.

Kasparov did not appear to have lost a step: He crushed his British opponent, 8 to 1.