Sicilian Defense: Modern Variations, Anti-Qxd4 Move Order Accepted

The Sicilian Defense: Modern Variations, Anti-Qxd4 Move Order Accepted is a chess opening classified under ECO code B50 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 4 moves: 1. e4 c5 2. Nf3 d6 3. d4 Nf6 4. dxc5 Nxe4. The resulting position leaves white to move.