ECO B06 · Pterodactyl Defense

Pterodactyl Defense: Fianchetto, Rhamphorhynchus

1. e4 g6 2. d4 Bg7 3. g3 c5 4. dxc5 Qa5+

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White to move. The arrow shows Stockfish’s best move.
Best move

5. c3+0.29

The position is roughly equal. Stockfish 18, depth 18.

Analyze this position

In the Pterodactyl Defense: Fianchetto, Rhamphorhynchus (B06), reached after 1. e4 g6 2. d4 Bg7 3. g3 c5 4. dxc5 Qa5+, Stockfish 18 recommends 5. c3 for White. The position is roughly equal (+0.29).

Top engine moves

  1. +0.295. c3 Qxc5 6. Be3 Qc7 7. Bg2 Nf6 8. Ne2 d6 9. h3 O-O
  2. +0.215. Bd2 Qxc5 6. Nc3 Nf6 7. Bg2 d6 8. Nge2 Bd7 9. O-O Nc6
  3. +0.055. Nd2 Qxc5 6. Ne2 d6 7. Bg2 Nf6 8. O-O O-O 9. c3 Qc7

Frequently asked questions

What is the best move in the Pterodactyl Defense: Fianchetto, Rhamphorhynchus?
After 1. e4 g6 2. d4 Bg7 3. g3 c5 4. dxc5 Qa5+, Stockfish 18 at depth 18 recommends 5. c3 for White, continuing Qxc5 6. Be3 Qc7 7. Bg2 Nf6 8. Ne2 d6 9. h3 O-O. The position is roughly equal (+0.29). The next best moves are 5. Bd2 (+0.21) and 5. Nd2 (+0.05).
Is the Pterodactyl Defense: Fianchetto, Rhamphorhynchus a good opening?
Stockfish rates the position at +0.29: the position is roughly equal. Evaluations this early in the game are small, so practical results depend far more on knowing the plans and typical structures than on the engine's number.
What is the ECO code of the Pterodactyl Defense: Fianchetto, Rhamphorhynchus?
B06. ECO codes classify chess openings from A00 to E99; B is the volume for semi-open games (other than the French).

Opening names from the Lichess opening book (CC0). Pieces by Colin M.L. Burnett (GPLv2+).