http://youtu.be/vmHPUtHlIXU Funny how, even though you've developed the mental skill and discipline to be the World Chess Champion, you can make a simple mistake. But what's much more intriguing is how, once you've actually made the mistake, you immediately know you've made it - as Carlsen did when he made this move, and as Anand did the moment he replied to Carlsen's game losing move, with a game losing failure to notice the mistake, until that is, until immediately after he made his move!