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.
1. e4 e5 2. f4 Qh4
◀ Undo move
♞ You have reached King's Gambit Declined: Keene's Defense C30 — the catalogued line ends exactly here.
Book continuations win% from 1.5M rated games
Matching openings 3
- King's Gambit Declined: Keene's Defense C30 1 ply deeper
- King's Gambit Declined: Keene Defense C30 2 plies deeper
…and 1 more lines run through this position — keep making moves to narrow it down.
3810 catalogued lines in total · openings encyclopedia