Tree path 6 levels King's Pawn Game › Modern Defense › Modern Defense › Standard Line › Modern Defense: Modern Pterodactyl › Pterodactyl Defense: Eastern, Rhamphorhynchus
- Chess Codex
- King's Pawn Game B00
- Modern Defense B06
- Modern Defense B06
- Standard Line B06
- Modern Defense: Modern Pterodactyl B06
- Pterodactyl Defense: Eastern, Rhamphorhynchus B06 you are here
Pterodactyl Defense: Eastern, Rhamphorhynchus
Overview
Pterodactyl Defense: Eastern, Rhamphorhynchus 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.
It begins with 7 plies and takes 1. e4 g6 2. d4 Bg7 3. Nc3 c5 4. dxc5 to reach the canonical position.
In the opening tree, this line branches off from Modern Defense: Modern Pterodactyl, part of the broader King's Pawn Game system.
2 named variations grow from this line, including Pterodactyl Defense: Eastern, Pteranodon, Pterodactyl Defense: Eastern, Pterodactyl.
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
- 7
- Direct variations
- 2
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
181,022 games · White 52.0% / Draw 5.2% / Black 42.8%
| Moves | Games | W / D / B |
|---|---|---|
| Qa5 | 67,794 | |
| Bxc3+ | 63,423 | |
| Nc6 | 26,933 | |
| Na6 | 7,515 | |
| Nf6 | 5,841 | |
| Qc7 | 3,947 | |
| e6 | 2,305 | |
| b6 | 1,475 |
Source: Lichess Opening Explorer · cached 2026-09-26 01:33:52
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