ECO B27 · Sicilian Defense

Sicilian Defense: Hyperaccelerated Pterodactyl

1. e4 c5 2. Nf3 g6 3. d4 Bg7

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

4. c3+0.64

White is slightly better. Stockfish 18, depth 18.

Analyze this position

In the Sicilian Defense: Hyperaccelerated Pterodactyl (B27), reached after 1. e4 c5 2. Nf3 g6 3. d4 Bg7, Stockfish 18 recommends 4. c3 for White. White is slightly better (+0.64).

Top engine moves

  1. +0.644. c3 cxd4 5. cxd4 d5 6. e5 Nh6 7. Nc3 O-O 8. h3 Nc6
  2. +0.634. dxc5 Nf6 5. Nc3 O-O 6. Bd3 Qa5 7. Be3 Ng4 8. Bd2 Qxc5
  3. +0.614. d5 Nf6 5. Bd3 d6 6. O-O O-O 7. h3 e6 8. c4 exd5

Variations

Frequently asked questions

What is the best move in the Sicilian Defense: Hyperaccelerated Pterodactyl?
After 1. e4 c5 2. Nf3 g6 3. d4 Bg7, Stockfish 18 at depth 18 recommends 4. c3 for White, continuing cxd4 5. cxd4 d5 6. e5 Nh6 7. Nc3 O-O 8. h3 Nc6. White is slightly better (+0.64). The next best moves are 4. dxc5 (+0.63) and 4. d5 (+0.61).
Is the Sicilian Defense: Hyperaccelerated Pterodactyl a good opening?
Stockfish rates the position at +0.64: 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 Sicilian Defense: Hyperaccelerated Pterodactyl?
B27. 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+).