Donald Trump envies anyone who can do things he can't.

A very strong player can manage and can just know how to manage a thousand positions. I get it; it's a very arbitrary number. So then you have the world champion who could do more. But, again, any increase in numbers creates, sort of, a new level of playing. And then you go to the very top, and the difference is so minimal, but it does exist. So even a few players who never became world champion, like Vassily Ivanchuk, for instance, I think they belong to the same category.

So many dictators trying to blackmail the free world because they have no way to compete on ideas, innovation or creativity. The Cold War was two competing visions of the future. I was always anti-communist but it was an idea at least, an alternative idea. We do not have a competing vision for the future because the ideals of these dictators are in the past. They are time travellers. They need confrontation and destruction to survive. The problem is, many people in the free world are sympathetic to Vladimir Putin.

One does not succeed by sticking to convention.

Kortchnoi's heritage is many-faceted - over the decades he has several times corrected and changed his style. But the main thing has invariably remained his search for chess truth.

The biggest problem I see among people who want to excel in chess – and in business and in life in general – is not trusting their instincts enough.

Chess is far too complex to be definitively solved with any technology we can conceive of today. However, our looked-down-upon cousin, checkers, or draughts, suffered this fate quite recently thanks to the work of Jonathan Schaeffer at the University of Alberta and his unbeatable program Chinook.