Incidentally the mental test of this best of 14 format isn’t even as hard as it can get. They used to play to a certain number of wins. The 1984 championship was abandoned in February 1985 (it started in September 1984) after 48 games (40 draws). They also had longer time controls back then, and would adjourn games overnight if necessary, so when you woke up to play a game you wouldn’t even know if you’d be able to go to sleep that night having finished it.
Actually relative strength is one of the things that wonder me the most I would say in the game: when one of the opponents is much stronger than the other the wins look so easy and the loses so stupid, but when the winner is matched against someone even stronger you see the same exact picture. I love you all I dunno why I say that now but here you go.
“It remains to be seen, of course, if Ian will be more resilient than he has been in the past if he is down”
So yes, it seems he has a bit of a problem in that department.
(https://www.theguardian.com/sport/2021/nov/24/magnus-carlsen...)