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. Move orders, not transpositions — exactly the paths over the board. Prefer the family trees? Every opening page has one.

1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Bc5 5. c3 ◀ Undo move

♞ You have reached Ruy Lopez: Classical Variation, Zukertort Gambit C65 — the catalogued line ends exactly here.

Book continuations

O-O 2

Matching openings 3

Ruy Lopez: Classical Defense, Benelux Variation C64 3 plies deeper
Ruy Lopez: Classical Variation, Modern Main Line C64 4 plies deeper

…and 1 more lines run through this position — keep making moves to narrow it down.

3810 catalogued lines in total · openings encyclopedia