Pterodactyl Defense: Western, Siroccopteryx
1. e4 g6 2. Nf3 Bg7 3. d4 c5 4. Bc4 cxd4 5. Nxd4 Qa5+
The Pterodactyl Defense: Western, Siroccopteryx is a chess opening classified as ECO B06, reached after 1. e4 g6 2. Nf3 Bg7 3. d4 c5 4. Bc4 cxd4 5. Nxd4 Qa5+. It is a line of the Pterodactyl Defense. White 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 0%, 100% were drawn and Black won 0%. The most popular continuation is 6. Nc3 (100% of games).
Engine evaluation: +0.02 (Stockfish, depth 42; best line 6. c3 Nf6 7. Qe2 d6 8. O-O O-O)
- ECO
- B06
- Moves
- 10 plies
- FEN
rnb1k1nr/pp1pppbp/6p1/q7/2BNP3/8/PPP2PPP/RNBQK2R w KQkq - 1 6- PGN
1. e4 g6 2. Nf3 Bg7 3. d4 c5 4. Bc4 cxd4 5. Nxd4 Qa5+
Analyse with Stockfish · Board image (SVG) · Open on Lichess
Results by rating
| Average rating | Games | White / draw / Black |
|---|---|---|
| 0-1499 | 1 | |
| All | 1 |
Most played moves
| Move | Games | White / draw / Black |
|---|---|---|
| 6. Nc3 | 1 (100%) |
Master games
1 over-the-board game is classified under this line (White 0%, draw 0%, Black 100%). The strongest:
- Prasath.T.S Malola (2069) – Chris J Bellers (2018) 0-1 · 4th Bournemouth Open 2015 · 2015-06-19
Search all games of the Pterodactyl Defense: Western, Siroccopteryx and its sub-variations
Highest-rated Lichess games
- Gvtien (1178) – Birdbrain8 (1205) 1/2-1/2 · 2026-09-02 · 180 + 2s
Comes from
Modern Defense (1. e4 g6) 1. e4 g6
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.