In 1972, in collaboration with George Botterill, two-times British champion, I published a revolutionary book on 1 … g6 which we named the Modern Defence. At first sight this defence is paradoxical, since it makes no attempt whatsoever to prevent the construction of a gigantic white pawn structure. However, its virtues have subsequently been recognised and it is now mainstream, as this week’s win by the world champion demonstrates.

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