Modern Defense: Semi-Averbakh Variation, Pterodactyl Variation Accepted

The Modern Defense: Semi-Averbakh Variation, Pterodactyl Variation Accepted is a chess opening classified under ECO code A04 in the Flank Openings family, characterized by moves like 1.c4, 1.Nf3, or 1.f4, aiming to control the center indirectly. It is reached after 5 moves: 1. Nf3 g6 2. d4 Bg7 3. e4 d6 4. c4 c5 5. dxc5 Qa5+. The resulting position leaves white to move.