Answer
Magnus Carlsen has held the world number one ranking in chess for a longer period than Anatoly Karpov. Carlsen has been ranked number one since 2011, while Karpov held the top spot from 1975 to 1985 and again from 1993 to 1996. Carlsen's dominance in the chess world has been marked by his consistent high level of play and his ability to win major tournaments.