We have again a strange gap. We have the big scientific discoveries around the second, third century BC. Then we have an invention of the so-called Arab system, the positional system of counting with zero dated to the eighth or ninth century.

The downfall of democratic institutions in Russia doesn't add to the self-confidence of either [Vladimir] Putin or his friends, as the loss of power could lead to repercussions in Russian society.

When I was preparing for one term's work in the Botvinnik school I had to spend a lot of time on king and pawn endings. So when I came to a tricky position in my own games I knew the winning method.

Rosneft, for instance, was mainly built upon capital stolen from [jailed oligarch Mikhail] Khodorkovsky's company, but the IPO was successful with many Western corporations investing in it. This means that it is extremely difficult to detect these assets in their pure form.

A machine helps us to annihilate our weaknesses. We don't have a steady hand. We can lose all vigilance. We can be distracted by something that is not that relevant. But we have intuition. We can feel certain things. And with a machine you can check whether it's right or wrong. That's why by bringing the two together, you create a very, very powerful combination.

There is no doubt that [Vladimir] Putin is responsible for this crime, whether or not he gave the order to commit the murder [of Boris Nemtsov] himself. Putin created the conditions and atmosphere that have made this kind of thing possible.

The ability to work hard for days on end without losing focus is a talent. The ability to keep absorbing new information after many hours of study is a talent.