Few things are as psychologically brutal as chess.

One lesson is to not to play desperately if your position is worse but still reasonable. Lashing out wildly in an inferior position usually only hastens defeat. Meanwhile, solid, stubborn defense can demoralize the attacker, make him lose confidence. When that happens, the tables can turn. Keep fighting, stay steady, keep morale high - and public protests are good for all of these things.

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.

I am between the Tories and the Lib Dems. I am fiscally conservative. I'm for strong foreign policy, but socially very liberal. I am not religious. That makes me feel uncomfortable with American Republicans. I don't feel at home anywhere, really. Labour under Tony Blair was not something I would associate myself with, but I didn't have a big problem with it. I have to make a choice between fiscal and the role of the state and social freedom.

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.

We should simply accept the fact that the way machines make decisions is different, and rather look at the result. If machines are providing results that we are looking for, you would mind how much human understanding was used in the process. And more likely we should look for the way of combining human skills and machine skills. And that, I believe, is the future role of humanity, is just to make sure it will be using this immense power of brute force of calculation for our benefit.

I’ve seen - both in myself and my competitors - how satisfaction can lead to a lack of vigilance, then to mistakes and missed opportunities.