Sicilian Defense B20–B99

Key strategic ideas

• Black fights for the centre from the side with the c-pawn. The goal is to challenge White's e4 pawn with ...d5, creating an unbalanced game with chances for both sides.
• White builds a strong centre with Nf3, d4, Nc3, and later f4. If White gets too much space, Black can get squeezed, so Black must create counterplay.
• Black's main weapons are the open c-file and queenside pushes with ...b5. White usually attacks on the kingside. It is often a race: whoever attacks faster wins.

Common mistakes & traps

• In the Najdorf, after 6.Bg5 e6 7.f4 Be7 8.Qf3 Qc7, White can launch a deadly attack with 10.g4! if Black responds too slowly. Black must counterattack quickly.
• The Dragon's bishop on g7 looks powerful, but White's Yugoslav Attack (Be3, Qd2, castling queenside, then h4-h5) can crash through. Black must attack on the queenside to stay alive.

Pawn structure notes

White has e4 and d4 pawns against Black's e6 and d6. In most lines, the d4 pawn gets traded for Black's c-pawn, leaving White with a central pawn majority and giving Black the open c-file.

Name origin

Named after Sicily, Italy, where the opening was first analysed in the 16th century. The earliest known mention is in Giulio Polerio's chess manuscripts from 1594.