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 c5 2. Nf3 a6 3. d4 ◀ Undo move

♞ You have reached Sicilian Defense: O'Kelly Variation, Normal System B28 — the catalogued line ends exactly here.

Book continuations

cxd4 4

Matching openings 5

Sicilian Defense: O'Kelly Variation, Normal System, Cortlever Gambit B28 2 plies deeper
Sicilian Defense: O'Kelly Variation, Normal System, Smith-Morra Line B28 2 plies deeper
Sicilian Defense: O'Kelly Variation, Normal System, Zagorovsky Line B28 2 plies deeper
Sicilian Defense: O'Kelly Variation, Normal System, Taimanov Line B28 3 plies deeper

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

3810 catalogued lines in total · openings encyclopedia