Well , the citation clearly shows that Chess, along with Noble Prizes (assuming here; within scientific field) and Turing Awards (all three being cognitively demanding) are indicators (not just possible) of intellectual superiority.
EDIT:
The chess computer claim by Lexus is a fantasy.
Chess computer only calculate (which is why they are inferior to human being) and memorize data.
It lack the intelligence part of a human player in term of strategy.
In short, Chess program are no more but brute calculator that will falter against human tactician (see Kasparov vs. Deep Blue).
Conclusion: you don't use chess computer to compare intelligence.
No, but if computers beat humans at chess, and you measure intellect by your ability to play chess, a computer is more intellectual then a human being. Thats why chess is a pretty bad indicator of intellect, at least on its own.
Well, let me elaborate on it. One can become the king of chess by purely focusing and specializing in chess. To be able to play chess, you need to understand the rules, and nothing more. To be able to be good at chess, you dont need to be smart, you need to be able to predict your opponents behavior. This can be learned through extensive practice. So in other words, you can be totally retarded when it comes to anything that isnt chess. (This is what a chess computer does).
On the other hand, this doesnt work for winning a nobel price or some other kind of award. It requires specialization, specialization in say physics. But in order to specialize in physics, you need a so much broader base of knowledge and understanding first. Thats why you can rightly say that someone who wins a nobel price for physics or something, is intellectually smarter then most people. A noble price cant be earned through extensive training in 'winning a noble price'.
So this is way chess is a crappy indicator of 'intellect' and winning a nobel price isnt.