>> henrik carlsen: yes. >> simon: and so, he says, does magnus. when i look at him, "enjoyment" is not the word that comes to mind. ( laughter ) >> henrik carlsen: it should. maybe you have to compare it to a writer or a painter. i mean, probably, if you see them at work, they... they're not smiling or having an easy time. they're exploiting their mind to the utmost. and the same with the chess players. >> simon: but that level of concentration is not danger- free. a fair number of grandmasters have gone mad, which is what happened to bobby fischer in his later years. >> bobby fischer: this was not an arrest. this was a kidnapping. it was all cooked up. >> simon: do you ever think about that? >> magnus carlsen: yes, i do. you know, when i was watching the... the recent film about bobby fischer, i was thinking, you know, "is this going to be me in... in a few years?" i don't think that's going to happen. but, you know, it made me... made me think a little bit that, you know, i have to... to be aware of this, at least. >> simon: people have describe