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.
⚖ Grouping by position
Grouping by position: lines that reach this position by a different move order are included too.
1. d4 g6 2. Nc3 Bg7 3. e4 c5 4. Nf3 Qa5
◀ Undo move
♞ You have reached Modern Defense: Pterodactyl Variation B27 — the catalogued line ends exactly here.
Matching openings 6
- Pterodactyl Defense: Sicilian, Siroccopteryx B06 1 ply deeper
- Pterodactyl Defense: Sicilian, Anhanguera B27 1 ply deeper
- Pterodactyl Defense: Sicilian, Benoni Gambit B27 1 ply deeper
- Pterodactyl Defense: Sicilian, Unpin B27 1 ply deeper
- Pterodactyl Defense: Sicilian, Quetzalcoatlus B06 2 plies deeper
…and 1 more lines run through this position — keep making moves to narrow it down.
3810 catalogued lines in total · openings encyclopedia