When I started out playing chess as a kid I thought I should be world champion. As a kid you have no idea what that means and you only sort of picture it. It is hard to imagine that I waited all those years and it happened in a late stage of my career.

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

I don't know how many calories an average chess player burns per game, but it often exceeds that of a player in ball games. It is not only the chess as such: You need to be fit and undergo complicated preparation.

I think an important lesson from the game is that once you have made a move, you cannot take it back. You really have to measure your decisions. You think a lot. You evaluate your choices very carefully. There's never any guarantee about what's going to follow once you have made a decision.

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.

In any match, there are few critical moments where there's no second best decision. The rest of the moves are intuitive.

It's important, according to me, to train in small doses so as to not lose the joy of playing chess. I personally think too many coaching and training classes may take away a child's interest in the game itself. The essential thing to do is practise often and, in case of a doubt, to consult a trainer.