Pterodactyl Defense: Sicilian, Siroccopteryx
1. e4 g6 2. d4 Bg7 3. Nc3 c5 4. Nf3 Qa5 5. Bc4
The Pterodactyl Defense: Sicilian, Siroccopteryx is a chess opening classified as ECO B06, reached after 1. e4 g6 2. d4 Bg7 3. Nc3 c5 4. Nf3 Qa5 5. Bc4. It is a line of the Pterodactyl Defense. Black is to move.
In 12.6 million rated Lichess games (blitz and slower), this position was reached 1 times by this move order. White won 100%, 0% were drawn and Black won 0%. The most popular continuation is 5… Nf6 (100% of games).
Engine evaluation: −1.88 (Stockfish, depth 29; best line 5… cxd4 6. Nxd4 Qc5 7. Be3 Qxc4 8. Nd5)
- ECO
- B06
- Moves
- 9 plies
- FEN
rnb1k1nr/pp1pppbp/6p1/q1p5/2BPP3/2N2N2/PPP2PPP/R1BQK2R b KQkq - 3 5- PGN
1. e4 g6 2. d4 Bg7 3. Nc3 c5 4. Nf3 Qa5 5. Bc4
Analyse with Stockfish · Board image (SVG) · Open on Lichess
Results by rating
| Average rating | Games | White / draw / Black |
|---|---|---|
| 2000+ | 1 | |
| All | 1 |
Most played moves
| Move | Games | White / draw / Black |
|---|---|---|
| 5… Nf6 | 1 (100%) |
Master games
8 over-the-board games are classified under this line (White 25%, draw 12%, Black 63%). The strongest:
- FM Bennet Biastoch (2344) – CM Jan Murawski (2251) 1/2-1/2 · 2nd 3-0 Thu 4th Jun 2026 · 2026-06-04
- FM Alexei Terzi (2272) – FM Charles H Storey (2138) 0-1 · Titled Tue 8th Nov Early · 2022-11-08
- FM Evsuld Myagmarsuren (2314) – CM Jan Murawski (2079) 1-0 · Titled Tue 4th Mar Early · 2025-03-04
- WGM Michalina Rudzinska (2212) – FM Charles H Storey (2159) 0-1 · Titled Tue 20th Aug Late · 2024-08-20
- Ludin Esteban Jaimes Gonzalez (2071) – CM Jan Murawski (2205) 0-1 · 1st 3-0 Thu 15th Jan 2026 · 2026-01-15
Search all games of the Pterodactyl Defense: Sicilian, Siroccopteryx and its sub-variations
Highest-rated Lichess games
- Morraski (2030) – Onkel_Pitsch (2015) 1-0 · 2026-09-02 · 180 + 0s
Comes from
Modern Defense: Modern Pterodactyl 1. e4 g6 2. d4 Bg7 3. Nc3 c5
More Pterodactyl Defense lines (all)
- Pterodactyl Defense: Central, Benoni Beefeater Pterodactyl A40
- Pterodactyl Defense: Central, Benoni Pterodactyl A40
- Pterodactyl Defense: Fianchetto, Queen Benoni Pterodactyl A40
- Pterodactyl Defense: Fianchetto, Queen Pteranodon A40
- Pterodactyl Defense: Fianchetto, Queen Pterodactyl A40
- Pterodactyl Defense: Queen Pterodactyl, Quiet Line A40
- Pterodactyl Defense A42
- Pterodactyl Defense: Central, Bogolubovia A42
- Pterodactyl Defense: Austrian, Austriadactylus Western B06
- Pterodactyl Defense: Austrian, Grand Prix Pterodactyl B06
- Pterodactyl Defense: Austrian, Pteranodon B06
- Pterodactyl Defense: Central, Anhanguera B06
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.