Tree path 7 levels King's Pawn Game › Sicilian Defense › Sicilian Defense › Hyperaccelerated Dragon › Sicilian Defense: Hyperaccelerated Dragon › Sicilian Defense: Hyperaccelerated Pterodactyl › Pterodactyl Defense: Western, Rhamphorhynchus
- Caissa Codex
- King's Pawn Game B00
- Sicilian Defense B20
- Sicilian Defense B27
- Hyperaccelerated Dragon B27
- Sicilian Defense: Hyperaccelerated Dragon B27
- Sicilian Defense: Hyperaccelerated Pterodactyl B27
- Pterodactyl Defense: Western, Rhamphorhynchus B27 you are here
Pterodactyl Defense: Western, Rhamphorhynchus
Overview
Pterodactyl Defense: Western, Rhamphorhynchus is a specific line in the Semi-Open Games family (ECO B27), arising from a recognised theoretical position.
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.
Play reaches this position via 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. dxc5 Qa5+, after 8 plies of opening development.
The line refines Sicilian Defense: Hyperaccelerated Pterodactyl, which traces back to the root opening King's Pawn Game.
It continues primarily into one named line, Pterodactyl Defense: Sicilian, Rhamphorhynchus.
In total, the branch covers 3 sub-variations across all depths.
Explore the position on the interactive board, study its real-world results from Lichess, and challenge the engine when you are ready.
- ECO code
- B27
- Group
- Semi-Open Games (B)
- Plies
- 8
- Direct variations
- 1
- Total in subtree
- 3
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
324,293 games · White 47.3% / Draw 4.7% / Black 47.9%
| Moves | Games | W / D / B |
|---|---|---|
| Bd2 | 105,561 | |
| c3 | 99,485 | |
| Nc3 | 87,620 | |
| Qd2 | 19,083 | |
| Nbd2 | 9,791 | |
| Nfd2 | 2,525 | |
| b4 | 212 | |
| Ke2 | 16 |
Source: Lichess Opening Explorer · cached 2026-09-26 01:47:56
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