Sicilian Defense: Najdorf Variation, English Attack, Anti-EnglishBETA

Bg5 is the main move that fights for the advantage. Given the opportunity, white would like to play f3, kicking the knight, and Be3, returning to the usual English Attack setup. However, in the meantime, white must ensure that black does not capture white's valuable dark squared bishop.

Rather than let white build up their strong kingside attack, black attempts to disturb white's normal f3, Bd2, Qd2, O-O-O setup before it gets off the ground. White can opt for an immediate three-fold repetition with Bc1 (after which white is threatening f3 and simply gaining a tempo on the main line), where the best move from black is to return the knight to f6. Alternatively, white can play on with Bg5 and allow black to expand on the kingside with h6-g5, leading to a fundamentally different position than the typical English Attack.