Comments here have been pretty funny.
It seems like the OP is trying to figure out what made 2 of the greatest players ever such poor losers? "Searching for Bobby Fischer" (the movie) seems to argue that it is Fischer's hatred of losing and air of superiority that made him World Chess Champion.
I read that there is strong evidence that some of the same genes that bring about greatness in math, (and also chess) can also bring on schizophrenia.
Chess players, by definition, have a major mental disorder. For beginner players it's called Pawneatingenia, for advanced players - Ratingchasingnia, for world-class players - Tournamentia.