Chess as a sport requires a lot of mental stamina, and this is what that makes it different from a physical sport. Chess players have a unique ability of taking in a lot of information and remembering relevant bits. So, memory and mental stamina are the key attributes.
Viswanathan AnandI like to keep myself physically and mentally fit before any important match. I usually take a short nap just before the game and do not practice immediately before the tournament.
Viswanathan AnandFor me, chess is not a profession, it is a way of life, a passion. People may feel that I have conquered the peak and will not have to struggle. Financially, perhaps that is true; but as far as chess goes, I'm still learning a lot!
Viswanathan Anand