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1.e4 c5 2.c3 d5 3.exd5 Qxd5 4.d4 cxd4 5.cxd4 Nc6 6.Nf3 Bg4 7.Nc3 Bxf3 8.gxf3 Qxd4 9.Qxd4 Nxd4 · ECO B22
Sicilian Defense: Alapin Variation, Barmen Defense, Endgame Variation is a chess opening that arises after 1.e4 c5 2.c3 d5 3.exd5 Qxd5 4.d4 cxd4 5.cxd4 Nc6 6.Nf3 Bg4 7.Nc3 Bxf3 8.gxf3 Qxd4 9.Qxd4 Nxd4. It is classified B22 in the ECO system, and the position after these moves has white to move. The Sicilian Defense is Black's most popular answer to 1.e4, meeting it with 1...c5 to fight for the centre asymmetrically rather than mirroring White's pawn. Because the pawn structures that result are unbalanced from move one, the Sicilian produces sharper and more double-edged positions than any other reply to the king's pawn, and it has the best practical scoring record for Black at master level.
Black accepts a slight lag in development in exchange for a queenside pawn majority and the half-open c-file, which becomes the main artery for counterplay. White typically attacks on the kingside while Black attacks on the queenside, so games often become a race in which tempo matters more than material.
Players who want winning chances with Black and are willing to learn theory. The main lines are heavily analysed, and being caught unprepared in the Najdorf or Dragon can lose quickly.
This line is a variation within the Sicilian Defense family. The strategic ideas above describe the family as a whole; this particular line reaches them by the move order 1.e4 c5 2.c3 d5 3.exd5 Qxd5 4.d4 cxd4 5.cxd4 Nc6 6.Nf3 Bg4 7.Nc3 Bxf3 8.gxf3 Qxd4 9.Qxd4 Nxd4.