Learning from our mistakes is critical for improving, but even I don't have patience for ranking my regrets. Regret is a negative emotion that inhibits the optimism required to take on new challenges. You risk living in an alternative universe, where if only you had done this or that differently, things would be better. That's a poor substitute for making your actual life better, or improving the lives of others. Regret briefly, analyze and understand, and then move on, improving the only life you have.

Energy is connected to physical fitness. One of the reasons I stayed at the top so long is that I was tremendously fit. At 36, I was fitter than most opponents ten years younger.

People's minds are polluted by these dark pictures of the future from Hollywood: "The Terminator," the Skynet, "The Matrix." It's world where there's no room for humans, or they have to fight against the machines. I think it's just a way, way, way, way in the future. Is it going to happen? I don't know. For me, these debates are not similar, but they resemble debates about how the sun will turn into a supernova in 4 to 5 billion years. Frankly, I don't care.

Moscow is simply unwilling to recognize the right of self-determination of nations.

We are living in a new ice age, and we need to apply the recipes of the Cold War to the Kremlin. That means isolation instead of offers of negotiation. And Ukraine should have been supplied with weapons long ago.

Throughout my chess career I sought out new challenges, looking for things no one had done before.

Many politicians in the West cling to the notion of a partnership with Russia. They want to include [Vladimir] Putin, make compromises and constantly negotiate new deals with him. But history has taught us that the longer we pursue appeasement and do nothing, the higher the price will be later on. Dictators don't ask "Why?" before they seize even more power. They ask: "Why not?"