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 d6 ◀ Undo move

♞ You have reached Ruy Lopez: Berlin Defense, Improved Steinitz Defense C66 — the catalogued line ends exactly here.

Book continuations

d4 5

Matching openings 6

Ruy Lopez: Closed Berlin Defense, Chigorin Variation C66 2 plies deeper
Ruy Lopez: Berlin Defense, Closed Wolf Variation C66 4 plies deeper
Ruy Lopez: Berlin Defense, Hedgehog Variation C66 4 plies deeper
Ruy Lopez: Berlin Defense, Closed Bernstein Variation C66 5 plies deeper
Ruy Lopez: Berlin Defense, Closed Showalter Variation C66 5 plies deeper

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

3810 catalogued lines in total · openings encyclopedia