Bent Larsen
The worst result of his career was his 6–0 defeat by Bobby Fischer in the semi-finals of the Candidates matches in 1971. The match was played in Denver, Colorado. Larsen later claimed in a Kasparov.com interview (1998) that his one-sided loss to Fischer was due in part to his condition during the match: "The organizers chose the wrong time for this match. I was languid with the heat and Fischer was better prepared for such exceptional circumstances... I saw chess pieces through a mist and, thus, my level of playing was not good". Fischer was the great player of the day, and went on to beat Spassky in 1972 for the World Championship.