World Chess Championship 1981 - Wikipedia

At what age are chess players at their peak?

Ranking chess players according to the quality of their moves

FIDE - International Chess Federation - Did you know that only 7 players have been rated #1 in the world (standard chess) since the FIDE rating list was first published in July

List of FIDE chess world number ones - Wikipedia

Magnus Carlsen ranks the World Chess Champions

Anatoly Karpov - Wikipedia

Karpov, Anatoly

Classic Karpov - Chess Lecture - Volume 161

Live Chess Ratings

One clear win and already tired of winning? - An interview with Anatoly Karpov