Sicilian Defense: Smith-Morra Gambit Accepted, Chicago Defense

1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 d6 5.Nf3 e6 6.Bc4 Nf6 7.O-O a6

ECO B21

The Sicilian Defense: Smith-Morra Gambit Accepted, Chicago Defense is a chess opening line in the Sicilian Defense complex, reached after 1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 d6 5.Nf3 e6 6.Bc4 Nf6 7.O-O a6.

It is catalogued under code B21 in the Encyclopaedia of Chess Openings (ECO).

The defining move a6 is chosen by Black on move 7.

The Sicilian Defense: Smith-Morra Gambit Accepted, Chicago Defense is a line of the Sicilian Defense. The Sicilian Defense is a chess opening that begins 1.e4 c5. Read the complete Sicilian Defense guide: what it is, how to reach it, its main variations, how to play against it, and its history.

More ECO B21 openings

• Bird Opening — 1.f4

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This position is covered in the Opening Tricks Hall of Fame course: a GM-authored repertoire you study move by move, then practice against a human-like AI opponent.

Every chess term used here is defined in the chess terms glossary. Browse all opening courses or the full ECO code index.