Queen's Pawn Game: London System, Pterodactyl Variation

The Queen's Pawn Game: London System, Pterodactyl Variation is a chess opening classified under ECO code D02 in the Closed & Semi-Closed Games family, arising from 1.d4 d5, including the Queen's Gambit, Slav Defense, and related systems. It is reached after 5 moves: 1. d4 g6 2. Nf3 Bg7 3. Bf4 c5 4. c3 cxd4 5. cxd4 Qa5+. The resulting position leaves white to move.