ECO B06 · Pterodactyl Defense

Pterodactyl Defense: Eastern, Benoni Pterodactyl

1. d4 g6 2. Nc3 Bg7 3. e4 c5 4. d5 Qa5

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

5. Bd2+0.88

White is clearly better. Stockfish 18, depth 18.

Analyze this position

In the Pterodactyl Defense: Eastern, Benoni Pterodactyl (B06), reached after 1. d4 g6 2. Nc3 Bg7 3. e4 c5 4. d5 Qa5, Stockfish 18 recommends 5. Bd2 for White. White is clearly better (+0.88).

Top engine moves

  1. +0.885. Bd2 d6 6. f4 Nf6 7. Nf3 O-O 8. Bc4 Qd8 9. O-O e6
  2. +0.875. h4 Nf6 6. Bd2 d6 7. a4 O-O 8. h5 Nxh5 9. g4 Nf6
  3. +0.845. a4 d6 6. Bd2 Nf6 7. h4 a6 8. h5 Nxh5 9. g4 Nf6

Frequently asked questions

What is the best move in the Pterodactyl Defense: Eastern, Benoni Pterodactyl?
After 1. d4 g6 2. Nc3 Bg7 3. e4 c5 4. d5 Qa5, Stockfish 18 at depth 18 recommends 5. Bd2 for White, continuing d6 6. f4 Nf6 7. Nf3 O-O 8. Bc4 Qd8 9. O-O e6. White is clearly better (+0.88). The next best moves are 5. h4 (+0.87) and 5. a4 (+0.84).
Is the Pterodactyl Defense: Eastern, Benoni Pterodactyl a good opening?
Stockfish rates the position at +0.88: white is clearly better. 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: Eastern, Benoni Pterodactyl?
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+).