42 ( +1 | -1 ) Certainly not entirely wrong, you have to know something about chess to do well at both long and blitz time controls, but different playing styles and attitudes (e.g. towards playing unsound moves) have different impacts at different time controls. And of course there's just some people that do not cope with time management in blitz games very well.
30 ( +1 | -1 ) Id say that 95% of all players could at least play good chess in both categories if they really made an effort to do so. If theyre not really old and actually function slower. Then some players may play thousands and thousands of blitz games while others seldom blitz at all.
33 ( +1 | -1 ) I would guess…that there would be little correlation between one's ability at blitz vs. correspondence chess. Blitz play rewards sharp lines and novel positions—things that most decent correspondence players can refute with a little time and analysis. Really they are two totally different games.