The Principia was published on 5 July 1687 btw. Newton was 45, probably some kind of dementia for his age.
I found his later life curious
Anecdotally, I used to play someone who had a Ph.d and despite his high intelligence, he was a weak player, probably in the 1350 range.
My opponents always play someone with a Ph.D, which anyone who is not retarded can get with a little work. ;-)
$$ to pay for the Ph.D. is often times the reason for lacking that degree.
After 18-years old, many folks are on their own, financially.
Chess is a performance based game, not a knowledge based one. You need a lot of qualities to be able to play chess well, like endurance and concentration. Lots of high IQ people lack both of those.
so right. there are other factors that would keep one from attaining a ph.d, and none have any relevance to one's potential.
in singapore, the 18 year old male gets drafted & the military provides. in return they take part of your brain. so that doesn't really help either ...