Tree path 3 levels King's Pawn Game › Modern Defense › Pterodactyl Defense: Western, Siroccopteryx
- Chess Codex
- King's Pawn Game B00
- Modern Defense B06
- Pterodactyl Defense: Western, Siroccopteryx B06 you are here
Pterodactyl Defense: Western, Siroccopteryx
Overview
Pterodactyl Defense: Western, Siroccopteryx is a named branch in the Semi-Open Games group of chess theory, classified under ECO B06.
The Semi-Open Games group covers semi-open games — replies to 1.e4 where Black declines the symmetrical 1…e5 in favour of an asymmetric pawn structure.
The line arises from 10 plies — specifically the moves 1. e4 g6 2. Nf3 Bg7 3. d4 c5 4. Bc4 cxd4 5. Nxd4 Qa5+.
In the opening tree, this line branches off from Modern Defense, part of the broader King's Pawn Game system.
Use the board to walk through every move, check how the position has scored on Lichess, or take it head-to-head against Stockfish.
- ECO code
- B06
- Group
- Semi-Open Games (B)
- Plies
- 10
- Parent
- Modern Defense
This overview is generated automatically from the opening's metadata. Know this line well? Write a description — submissions are reviewed before publishing.
Statistics from Lichess
4,054 games · White 35.3% / Draw 3.3% / Black 61.4%
| Moves | Games | W / D / B |
|---|---|---|
| c3 | 1,836 | |
| Nc3 | 1,661 | |
| Bd2 | 541 | |
| Qd2 | 8 | |
| Nd2 | 4 | |
| Kf1 | 3 | |
| b4 | 1 |
Source: Lichess Opening Explorer · cached 2026-09-26 02:13:07
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