Preparedness for a game that usually lasts four-five hours requires good physical condition and also steady nerves.

If revenge motivates you, go for it! But the main thing is to set your game in order.

Grandmasters decline with age. That's a given. There is nothing special about the age of 40, but age eventually takes its toll. That much is clear. Beyond that it's about how long you can put off the effects and compensate for them. Mistakes will crop in but you try to compensate for them with experience and hard work.

You bring to chess facets of your personality and what you are. I have interests other than chess, like music and world and current affairs. I also have many friends around the world with whom I like to keep in touch.

A win is a win, which is about that particular moment.

Carlsen will be ridiculously difficult to play against. (on the 2013 World Championship match)

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.