[OJFord]

I don't see how he could (or why he would) have, in the same room, eyes often closed, yelling at people to shut up so he could concentrate; occasionally checking the board state with me (always bang on) - but as I replied to sibling, it's not necessary to have a great memory like that is it? Of course, picturing/tracking the current state of the board has a lot of overlap with thinking x moves ahead though I suppose.