Bent Larsen, a Danish-born chess grandmaster who was a perennial challenger for the world championship during the 1960s and ’70s, died on Sept. 9 in Buenos Aires, where he had lived for many years. He was 75.

His death was announced on the Web site of the Danish chess union. No cause was given, but he was known to have suffered from diabetes, according to Chessbase, a chess news Web site.

Mr. Larsen disdained draws and often sought to create unbalanced positions where both players had good winning, and losing, chances. He was well aware of the risks of this approach.

“To win, it is necessary to accept lost positions,” he said.

It was a testament to his abilities that he was usually successful.