Sicilian Defense: Smith-Morra Gambit Declined, Center Formation

The Sicilian Defense: Smith-Morra Gambit Declined, Center Formation is a chess opening classified under ECO code B21 in the Semi-Open Games family, where Black responds to 1.e4 with something other than 1...e5, including the Sicilian Defense, Caro-Kann, and Pirc. It is reached after 3 moves: 1. e4 c5 2. d4 cxd4 3. c3 e5. The resulting position leaves white to move.