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 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bf4 ◀ Undo move

♞ You have reached Queen's Gambit Declined: Harrwitz Attack D37 — the catalogued line ends exactly here.

Book continuations

O-O 4

Matching openings 5

Queen's Gambit Declined: Harrwitz Attack, Two Knights Defense D37 3 plies deeper
Queen's Gambit Declined: Harrwitz Attack, Main Line D37 5 plies deeper
Queen's Gambit Declined: Harrwitz Attack D37 10 plies deeper
Queen's Gambit Declined: Harrwitz Attack D37 10 plies deeper

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

3810 catalogued lines in total · openings encyclopedia