Sicilian Defense: Moscow Variation, Haag Gambit

The Sicilian Defense: Moscow Variation, Haag Gambit is a chess opening classified under ECO code B52 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 7 moves: 1. e4 c5 2. Nf3 d6 3. Bb5+ Bd7 4. Bxd7+ Qxd7 5. O-O Nc6 6. c3 Nf6 7. d4. The resulting position leaves black to move.