Sicilian Defense: Hyperaccelerated Pterodactyl, Exchange Variation
1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. dxc5 Qa5+ 5. Nc3 Bxc3+ 6. bxc3 Qxc3+
The Sicilian Defense: Hyperaccelerated Pterodactyl, Exchange Variation is a chess opening classified as ECO B27, reached after 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. dxc5 Qa5+ 5. Nc3 Bxc3+ 6. bxc3 Qxc3+. It is a line of the Sicilian Defense. White is to move.
In 12.6 million rated Lichess games (blitz and slower), this position was reached 29 times by this move order. White won 62%, 0% were drawn and Black won 38%. The most popular continuation is 7. Bd2 (97% of games).
Engine evaluation: 0.00 (Stockfish, depth 38; best line 7. Bd2 Qxc5 8. Bd3 d6 9. O-O Nf6)
- ECO
- B27
- Moves
- 12 plies
- FEN
rnb1k1nr/pp1ppp1p/6p1/2P5/4P3/2q2N2/P1P2PPP/R1BQKB1R w KQkq - 0 7- PGN
1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. dxc5 Qa5+ 5. Nc3 Bxc3+ 6. bxc3 Qxc3+
Analyse with Stockfish · Board image (SVG) · Open on Lichess
Results by rating
| Average rating | Games | White / draw / Black |
|---|---|---|
| 0-1499 | 6 | |
| 1500-1999 | 14 | |
| 2000+ | 9 | |
| All | 29 |
Most played moves
| Move | Games | White / draw / Black |
|---|---|---|
| 7. Bd2 | 28 (97%) | |
| 7. Qd2 | 1 (3%) |
Master games
2 over-the-board games are classified under this line (White 0%, draw 0%, Black 100%). The strongest:
- WIM Mathilde Congiu (2317) – FM Jose Manuel Perez Gonzalez (2349) 0-1 · TCh-Madrid 2014-15 · 2014-11-23
- CM Roc Boix Redorta (2084) – FM Alex Golding (2405) 0-1 · Titled Tue 10th Dec Early · 2024-12-10
Highest-rated Lichess games
- ChessValkyrie (2458) – Mandarria-76 (2375) 0-1 · 2026-09-02 · 180 + 2s
- Nikkkita (2404) – Mandarria-76 (2416) 1-0 · 2026-09-02 · 180 + 2s
- FM lazarofree (2402) – vladleo54 (2042) 1-0 · 2026-09-02 · 180 + 0s
Comes from
Pterodactyl Defense: Sicilian, Pteranodon 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. dxc5 Qa5+ 5. Nc3 Bxc3+ 6. bxc3
More Sicilian Defense lines (all)
- Sicilian Defense (1. e4 c5) B20
- Sicilian Defense: Amazon Attack B20
- Sicilian Defense: Big Clamp Formation B20
- Sicilian Defense: Bowdler Attack B20
- Sicilian Defense: Brick Variation B20
- Sicilian Defense: Czerniak Attack B20
- Sicilian Defense: Czerniak Attack, Queen Fianchetto Variation B20
- Sicilian Defense: Euwe Attack, Prins Gambit B20
- Sicilian Defense: Gloria Variation B20
- Sicilian Defense: Grob Variation B20
- Sicilian Defense: Keres Variation B20
- Sicilian Defense: King David's Opening B20
Opening names and moves from the Lichess openings dataset; statistics from the Lichess open database, 2026-09 (CC0), sample of 12.6 million games, bots excluded; evaluations from Lichess cloud analysis (all CC0). Master games from The Week in Chess #920–#1664 by Mark Crowther, used with permission.