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 Nge7 ◀ Undo move

♞ You have reached Ruy Lopez: Cozio Defense C60 — the catalogued line ends exactly here.

Book continuations

Nc3 1

Matching openings 2

Ruy Lopez: Cozio Defense, Paulsen Variation C60 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