ECO B06 · Pterodactyl Defense

Pterodactyl Defense: Central, Anhanguera

1. e4 g6 2. d4 Bg7 3. c4 c5 4. Nc3 d6 5. Be3 Qa5

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

6. d5+0.54

White is slightly better. Stockfish 18, depth 18.

Analyze this position

In the Pterodactyl Defense: Central, Anhanguera (B06), reached after 1. e4 g6 2. d4 Bg7 3. c4 c5 4. Nc3 d6 5. Be3 Qa5, Stockfish 18 recommends 6. d5 for White. White is slightly better (+0.54).

Top engine moves

  1. +0.546. d5 Bxc3+ 7. bxc3 f5 8. exf5 Bxf5 9. Bd2 Nf6 10. a4 Ne4
  2. +0.426. Ne2 Nf6 7. f3 O-O 8. Nc1 cxd4 9. Nb3 Qc7 10. Nxd4 Nc6
  3. +0.356. Nf3 Bg4 7. Qb3 Nd7 8. d5 Bxc3+ 9. bxc3 Bxf3 10. gxf3 a6

Frequently asked questions

What is the best move in the Pterodactyl Defense: Central, Anhanguera?
After 1. e4 g6 2. d4 Bg7 3. c4 c5 4. Nc3 d6 5. Be3 Qa5, Stockfish 18 at depth 18 recommends 6. d5 for White, continuing Bxc3+ 7. bxc3 f5 8. exf5 Bxf5 9. Bd2 Nf6 10. a4 Ne4. White is slightly better (+0.54). The next best moves are 6. Ne2 (+0.42) and 6. Nf3 (+0.35).
Is the Pterodactyl Defense: Central, Anhanguera a good opening?
Stockfish rates the position at +0.54: white is slightly 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: Central, Anhanguera?
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+).