Modern Defense: Semi-Averbakh Variation, Pterodactyl Variation

The Modern Defense: Semi-Averbakh Variation, Pterodactyl Variation 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 4 moves: 1. Nf3 c5 2. c4 g6 3. d4 Bg7 4. e4 Qa5+. The resulting position leaves white to move.