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. d4 f5 2. g3 Nf6 3. Bg2 g6 ◀ Undo move

♞ You have reached Dutch Defense: Semi-Leningrad Variation A81 — the catalogued line ends exactly here.

Book continuations

Nf3 2

Matching openings 3

Dutch Defense: Leningrad Variation, Warsaw Variation A88 8 plies deeper
Dutch Defense: Leningrad Variation, Matulovic Variation A89 8 plies deeper

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

3810 catalogued lines in total · openings encyclopedia