Sicilian Defense: Four Knights Variation, Cobra Variation

The Sicilian Defense: Four Knights Variation, Cobra Variation is a chess opening classified under ECO code B45 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 6 moves: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 Nf6 6. Ndb5 Bc5. The resulting position leaves white to move.