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.

♜♞♝♛♚♝♜♟♟♟♟♟♟♟♞♟♟♟♞♟♞♟♟♟♟♟♜♝♛♚♝♜a8b7c6d5e4f3g2h1
1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 ◀ Undo move

♞ You have reached Semi-Slav Defense: Main Line D45 — the catalogued line ends exactly here.

Book continuations win% from 1.5M rated games

Matching openings 28

…and 16 more lines run through this position — keep making moves to narrow it down.

3810 catalogued lines in total · openings encyclopedia