Sicilian Defense, Classical Variation

The Classical Sicilian arises in the Open Sicilian Defense. After the exchange on d4, Black develops one knight to f6 and the other to c6. The move ...Nc6 defines the variation: it pressures d4, improves a piece, and leaves the e7 and g7 pawns unmoved, so Black still has several structural choices.

White's most characteristic reply is Bg5, known as the Richter-Rauzer Attack. The bishop increases the pressure on the f6-knight and prepares to exchange it, which may force Black to recapture with a pawn and alter the pawn structure. White often prepares Qd2 and queenside castling, the move that places the king on c1 and the rook on d1, to pressure d6 and attack on the kingside. Plans with Bc4, Be2, or f3 are also possible.

...Nc6 defines the Classical and 6.Bg5 poses the Richter-Rauzer

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StartNf6Nc3Nc6Bg5

4...Nf6 creates an immediate threat against e4, so White must account for the defense of the center.

The Classical begins after the central exchange

The development order first addresses e4 and then fixes Black's characteristic two-knight setup.

1. 4...Nf6 creates an immediate threat against e4, so White must account for the defense of the center.
2. 5.Nc3 supports e4 and adds control over d5, an important central square in many Sicilians.
3. 5...Nc6 completes the characteristic knight pair and adds direct pressure against the piece on d4.

Black seeks rapid development, pressure on d4, and a central ...d5 break when possible. Depending on the e-pawn setup, the game may transpose, meaning that a different move order reaches another Sicilian variation. Compared with the Najdorf, the Classical chooses ...Nc6 instead of ...a6; compared with the Dragon, it has not yet committed to ...g6.