The broader the chess player you are, the easier it is to be competitive, and the same seems to be true of mathematics - if you can find links between different branches of mathematics, it can help you resolve problems. In both mathematics and chess, you study existing theory and use that to go forward.

In a way players at the top should try to promote the game in their own countries as that is the legacy that makes you feel proud. If you have not done that you have failed as a sportsperson.

Before a game, I avoid having a heavy meal so that I don't feel sleepy at the board. You eat to be healthy, and that generally takes care of everything. Also, you can't be too finicky, since at tournaments you tend to eat at restaurants here and there. But, as long as you're eating sensibly, it's all good.

I would prefer chess to become part of the Olympic Games. This would also lead to chess become more accepted as a sport in general.

In the knockout tournaments, it's futile to prepare for a grand finale. You may have worked out many strategies for the final. But you may lose in the first round itself.

I'll take my five positions per second any day, thank you

Chess is like a language, the top players are very fluent at it. Talent can be developed scientifically but you have to find first what you are good at.