Franco, Chess explained: English Opening

The English Opening is a flexible and dynamic choice for White, which avoids a great deal of sharp and well-mapped opening theory. It is popular with all levels of chess-players, and has been used to good effect at world championship level by Kasparov, Korchnoi, Botvinnik and other greats of the game. The English gives rise to an immense variety of structures, ranging from reversed Sicilians to Hedgehogs and fluid or locked central structures. It is an opening where strategic mastery of typical positions is of immense benefit, and where Black needs to combine circumspection and vigour to obtain a viable game.