Opening explorer
Walk any move order through the catalog: pick a book continuation and watch the board, or open the matching ECO lines on the side. By default move orders are strict — flip the toggle to group by position and pull in transpositions.
1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. dxc5 Qa5 5. Nc3
◀ Undo move
♞ You have reached Pterodactyl Defense: Sicilian, Rhamphorhynchus B27 — the catalogued line ends exactly here.
Book continuations win% from 1.5M rated games
Matching openings 3
- Pterodactyl Defense: Sicilian, Pteranodon B27 2 plies deeper
- Sicilian Defense: Hyperaccelerated Pterodactyl, Exchange Variation B27 3 plies deeper
…and 1 more lines run through this position — keep making moves to narrow it down.
3810 catalogued lines in total · openings encyclopedia