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 g5 ◀ Undo move

♞ You have reached Borg Defense B00 — the catalogued line ends exactly here.

Book continuations

d4 3

Matching openings 4

Borg Defense: Borg Gambit B00 2 plies deeper
Borg Defense: Zilbermints Gambit B00 2 plies deeper
Borg Defense: Troon Gambit B00 4 plies deeper

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

3810 catalogued lines in total · openings encyclopedia