I'd be hard pressed to think any GM let alone Kaspsrov, Fisher, Calsen etc have actually genius IQs
If they do have genius IQ's... they are lazy genius'
All that IQ and they try to make a living playing chess? .1% make decent living play chess and only for a short period of time.
What they do have (and this is known) are photographic memories. I'd wager you are not getting higher than 2500 elo without having some level of a photographic memory.
Where the super elite players differ is that they are really good at playing chess also. Carlsen publicly stated he has 10,000 games memorized. So when playing him, he's recalling game analysis till someone diverges from known theory.
#659 The double 'and' shows you are talking tripe.