On a good day, Chucky is the best player on Planet Earth.
On a bad day, he's the best player on Planet Ivanchuk.
Remember the 2013 Candidates in London? Ivanchuk beat both Carlsen and Kramnik (the #1 and #2 finishers) but lost most of his remaining games... several of them lost on time.
Garry Kasparov is widely considered one of the greatest chess players of all time, but even he lost some games. The only man Kasparov ever feared is Vassily Ivanchuk. This game was played on Feb 23, 1991.