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. e4 g6 2. Nf3 Bg7 3. d4 c5 4. dxc5 ◀ Undo move

Book continuations win% from 1.5M rated games

Qa5+ 4

Matching openings 4

Pterodactyl Defense: Western, Rhamphorhynchus B27 1 ply deeper
Pterodactyl Defense: Sicilian, Rhamphorhynchus B27 2 plies deeper
Pterodactyl Defense: Sicilian, Pteranodon B27 4 plies deeper
Sicilian Defense: Hyperaccelerated Pterodactyl, Exchange Variation B27 5 plies deeper

3810 catalogued lines in total · openings encyclopedia