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
⚖ Grouping by position Grouping by position: lines that reach this position by a different move order are included too.
1. d4 d5 2. Nf3 Nf6 3. c4 e6 4. Nc3 c5 ◀ Undo move

♞ You have reached Queen's Gambit Declined: Semi-Tarrasch Defense D40 — the catalogued line ends exactly here.

Book continuations win% from 1.5M rated games

3810 catalogued lines in total · openings encyclopedia