Here's an interesting quote:
One of the wonders of chess history was the appearance in the chess arena in the mid-20th century of a young Brazilian, who in a few years acquired sufficient strength and experience to fight for the title of world champion. In Brazil, a country famous for its football but with a lack of chess traditions, there emerged a youngster who at the age of 13 scored 50% in a very strong grandmaster tournament, the so-called 'Interzonal' in Sousse in 1967. The youngster did not rest on his laurels, and in 1973 he won the Interzonal Tournament in Petropolis! Looking at the history of chess competitions, I have to conclude that [Henrique] Mecking's successes were exceptional. I consider the Brazilian player's talent to be comparable with that of the brilliant individuals Mikhail Tal and Magnus Carlsen.
Who said it?