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 Nf6 3. Bc4 ◀ Undo move

♞ You have reached Petrov's Defense: Italian Variation C42 — the catalogued line ends exactly here.

Book continuations

Nxe4 2

Matching openings 3

Bishop's Opening: Boden-Kieseritzky Gambit C27 2 plies deeper
Bishop's Opening: Boden-Kieseritzky Gambit, Lichtenhein Defense C27 3 plies deeper

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

3810 catalogued lines in total · openings encyclopedia