The Sicilian, Rhamphorhynchus is a variation of the Pterodactyl Defense, catalogued as ECO B27. The line runs 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. dxc5 Qa5+ 5. Nc3, reaching the position shown below after 9 half-moves.
White holds the centre with pawns on e4. Development is level at two minor pieces each, and White is up a pawn of material. It is Black to move after five moves. White has doubled pawns on the c-file.
On the Pterodactyl Defense generally: ECO A40. A chess opening with 34 known variations.
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The Sicilian, Rhamphorhynchus goes 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. dxc5 Qa5+ 5. Nc3. It is a variation of the Pterodactyl Defense and is catalogued as ECO B27.
The Sicilian, Rhamphorhynchus is ECO B27. ECO codes group openings by their move order, so nearby codes cover closely related lines of the Pterodactyl Defense.
Stockfish evaluates the position after 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. dxc5 Qa5+ 5. Nc3 at +0.12 at depth 18, which is balanced. Engine evaluation is only a starting point — at club level the practical value of a line is mostly about whether you know its plans better than your opponent does.
White holds the centre with pawns on e4. Development is level at two minor pieces each, and White is up a pawn of material. It is Black to move. White has doubled pawns on the c-file.