"It is often supposed that, apart from their ’extraordinary powers of memory,’ expert players have phenomenal powers of calculation. The beginner believes that experts can calculate dozens of moves ahead and he will lose to them only because he cannot calculate ahead so far. Yet this is utter nonsense. From my own experience I can say that grandmasters do not do an inordinate amount of calculating. Tests support me in this claim. If anything, grandmasters often consider fewer alternatives; they tend not to look at as many possible moves as weaker players do. And so, perversely, chess skill often seems to reflect the ability to avoid calculations . . ."
Artur Yusupov
Yes, I like this quote.
"You remember Richard Reti’s words? "Those chess lovers who ask me how many moves I usually calculate in advance, when making a combination, are always astonished when I reply, quite truthfully, ’as a rule not a single one’ ""
http://www.bworldonline.com/main/content.php?id=4703