Sicilian, Rhamphorhynchus

The Rhamphorhynchus is the Sicilian route into the Pterodactyl Defense. After 4. dxc5 Qa5+ 5. Nc3, Black is a pawn down for the moment and usually recovers it at once with 5...Qxc5, keeping the queen active and the g7-bishop on the long diagonal. The less common 5...Bxc3+ gives up the bishop to double White's c-pawns, which is the Pteranodon idea. The engine rates the position as balanced, and Lichess results are close to even.