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.

But we must not forget the effort undertaken by the ruling elite in Russia to manipulate Western politicians, businessmen as well as journalists. That's why [Vladimir] Putin's "fifth column" is that powerful in the West.

Setbacks and losses are both inevitable and essential if you're going to improve and become a good, even great, competitor. The art is in avoiding catastrophic losses in the key battles.

Chess helps you to concentrate, improve your logic. It teaches you to play by the rules and take responsibility for your actions, how to problem solve in an uncertain environment.

It didn't take long to recognise the shortcomings of the Soviet regime and to see the values of the free world.

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

The worst enemy of the strategist is the clock. Time trouble... Reduces us all to pure reflex and reaction, tactical play. Emotion and instinct cloud our strategic vision when there is no time for proper evaluation.