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 d5 2. c4 e6 3. Nc3 c6 4. e4 ◀ Undo move

♞ You have reached Semi-Slav Defense: Marshall Gambit D31 — the catalogued line ends exactly here.

Book continuations

dxe4 4

Matching openings 5

Semi-Slav Defense: Gunderam Gambit D31 2 plies deeper
Semi-Slav Defense: Marshall Gambit, Forgotten Variation D31 4 plies deeper
Semi-Slav Defense: Marshall Gambit, Main Line D31 4 plies deeper
Semi-Slav Defense: Marshall Gambit, Tolush Variation D31 11 plies deeper

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

3810 catalogued lines in total · openings encyclopedia