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. b4 e6 2. Bb2 Nf6 3. b5 a6
◀ Undo move
♞ You have reached Polish Opening: Queenside Defense A00 — the catalogued line ends exactly here.
Book continuations win% from 1.5M rated games
Matching openings 2
- Polish Opening: Rooks Swap Line A00 5 plies deeper
…and 1 more lines run through this position — keep making moves to narrow it down.
3810 catalogued lines in total · openings encyclopedia