I don't really like discussions about a supposed Russian national character.

Boris Vasilievich was the only top-class player of his generation who played gambits regularly and without fear ... Over a period of 30 years he did not lose a single game with the King's Gambit, and among those defeated were numerous strong players of all generations, from Averbakh, Bronstein and Fischer, to Seirawan.

The sanctions and travel restrictions would have to be far more comprehensive to be truly painful for [Vladimir] Putin and his inner circle. And the new middle class should also feel the effects of what he is doing. For instance, we should ask those who wish to enter the EU whether they have visited illegally occupied Crimea in the last few months and, if the answer is "yes," deny them a visa.

Sometimes the hardest thing to do in a pressure situation is to allow the tension to persist. The temptation is to make a decision, any decision, even if it is an inferior choice.

Many so-called pragmatists want nothing to do with space exploration or other kinds of ambitious endeavours that don't have a clear payoff. This mentality is hugely damaging to our success as a civilization. Our desire to understand the universe is kindled by curiosity and wonder, and this has fuelled countless scientific breakthroughs.

I can't think of a scenario under which [Vladimir Putin] would gradually resign from power. For him and those around him, power became a source of unlimited enrichment. A loss of power would be tantamount to an annihilation of the economic success that has been achieved so far.

The stock market and the gridiron and the battlefield aren't as tidy as the chessboard, but in all of them, a single, simple rule holds true: make good decisions and you'll succeed; make bad ones and you'll fail.