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. Nc3 Nf6 4. Nxe5
◀ Undo move
♞ You have reached Four Knights Game: Halloween Gambit C47 — the catalogued line ends exactly here.
Book continuations
Matching openings 3
- Four Knights Game: Halloween Gambit, Oldtimer Variation C47 9 plies deeper
- Four Knights Game: Halloween Gambit, Plasma Variation C47 15 plies deeper
…and 1 more lines run through this position — keep making moves to narrow it down.
3810 catalogued lines in total · openings encyclopedia