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. By default move orders are strict — flip the toggle to group by position and pull in transpositions.
⚖ Grouping by position
Grouping by position: lines that reach this position by a different move order are included too.
1. d4 d5 2. c4 e6 3. Nc3 c6 4. e3 f5
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♞ You have reached Semi-Slav Defense: Anti-Noteboom, Stonewall Variation D31 — the catalogued line ends exactly here.
Book continuations win% from 1.5M rated games
Matching openings 2
…and 1 more lines run through this position — keep making moves to narrow it down.
3810 catalogued lines in total · openings encyclopedia