One thing that we keep coming back to in this thread is of course the question of IQ ratings. I still have the feeling that IQ tests tend to lean towards testing memory capacity and having a very good memory is very important for Chess Players.There are other factors of course but the memory Question is essential.
In these forums there is a thread on the go ( in Hot Topics at this time ) where some people have tried to say that Paul Morphy was not all that good. He did of course manage to beat all of the top players of his day so he cannot have been all that bad. However people are trying to compare him to modern GMs which is not really fair. For one thing if Morphy were alive today he would have been able to study all of the changes that have occured in Chess theory since the 19th Century. Also he would have the advantage of studying with modern Chess Computers so he would be quite a different Chess Player today than he was in his time.
Thanks for the recent posts. Well if one watches the Evening news one can see no end of people who seem to have more than the " standard deviation " lol. Mind you this takes us away from the topic ( & I do have a thread on the go for " odds and ends " etc ).