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 Bc5 3. Nf3 d6 4. c3 f5
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♞ You have reached King's Gambit Declined: Classical Variation, Rubinstein Countergambit C30 — the catalogued line ends exactly here.
Book continuations win% from 1.5M rated games
Matching openings 2
- King's Gambit Declined: Classical, Réti Variation C30 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