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Sicilian Defense: Najdorf VariationBETA
f3 covers the g4 square and therefore allows for Be3 without being harassed by Ng4. This is an alternative move order to reach the English attack which starts after the immediate Be3.
The Najdorf Sicilian is one of the most popular variations in all of chess. It is highly theoretical, and leads to extremely double-edge positions with winning chances for both sides. White's lead in development means they can often build up a huge kingside attack, while black has lots of counter-attacking chances on the queenside due to their solid center and flexible pawn structure.