I have no idea how long Putin will last. The good news is, Putin doesn't know either. It will be sudden and it won't be peaceful. He has burned his bridges.

Attackers may sometimes regret bad moves, but it is much worse to forever regret an opportunity you allowed to pass you by.

When you put party over principles, you can't avoid tripping over your own hypocrisy and contradictions eventually. The GOP establishment refused to stand up to Trump during the primary because they wanted his voters in order to beat Hillary Clinton. Then he won the primary, and then the general, and the GOP both times decided it was better to cling to their grasp at power, to cling to Trump and all he stands for, a decision that should destroy the party or drag it down for a generation.

I'm not paranoid, but I am cautious. I don't drink tea with strangers, I don't fly Aeroflot and I avoid certain countries with close ties to Russia.

A grandmaster needs to retain thousands of games in his head, for games are to him what the words of their mother tongue are to ordinary people, or notes or scores to musicians.

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.

Enormous self-belief, intuition, the ability to take a risk at a critical moment and go in for a very dangerous play with counter-chances for the opponent - it is precisely these qualities that distinguish great players.