Click any move to jump to that position; switch branches at any point with the alternative moves. Test your knowledge plays the shown position against the engine.
| Name | ECO | Main line length |
|---|
| King's Gambit Declined: Zilbermints Double Countergambit | C30 | 4 plies |
| King's Gambit Declined: Panteldakis Countergambit | C30 | 4 plies |
| King's Gambit Declined: Mafia Defense | C30 | 4 plies |
| King's Gambit Declined: Falkbeer Countergambit | C31 | 4 plies |
| King's Gambit Declined: Classical Variation | C30 | 4 plies |
| King's Gambit Declined: Queen's Knight Defense | C30 | 4 plies |
| King's Gambit Declined: Petrov's Defense | C30 | 4 plies |
| King's Gambit Declined: Norwalde Variation | C30 | 4 plies |
| King's Gambit Declined: Keene's Defense | C30 | 4 plies |
| King's Gambit Declined: Falkbeer Countergambit, Hinrichsen Gambit | C31 | 5 plies |
| King's Gambit Declined: Falkbeer Countergambit, Milner-Barry Variation | C31 | 5 plies |
| King's Gambit Declined: Falkbeer Countergambit, Blackburne Attack | C31 | 5 plies |
| King's Gambit Declined: Keene's Defense | C30 | 5 plies |
| King's Gambit Declined: Classical Variation, Walthoffen Attack | C30 | 5 plies |
| King's Gambit Declined: Falkbeer Countergambit Accepted | C31 | 5 plies |
| King's Gambit Declined: Zilbermints Double Gambit | C30 | 6 plies |
| King's Gambit Declined: Miles Defense | C30 | 6 plies |
| King's Gambit Declined: Senechaud Countergambit | C30 | 6 plies |
| King's Gambit Declined: Falkbeer Countergambit, Nimzowitsch-Marshall Countergambit | C31 | 6 plies |
| King's Gambit Declined: Falkbeer Countergambit, Staunton Line | C31 | 6 plies |
| King's Gambit Declined: Keene Defense | C30 | 6 plies |
| King's Gambit Declined: Panteldakis Countergambit, Schiller's Defense | C30 | 6 plies |
| King's Gambit Declined: Soller-Zilbermints Gambit | C30 | 6 plies |
| King's Gambit Declined: Falkbeer Countergambit, Miles Gambit | C31 | 6 plies |
| King's Gambit Declined: Panteldakis Countergambit, Greco Variation | C30 | 6 plies |
| King's Gambit Declined: Falkbeer Countergambit, Modern Transfer | C31 | 6 plies |
| King's Gambit Declined: Classical Variation | C30 | 7 plies |
| King's Gambit Declined: Classical Variation, Rotlewi Countergambit | C30 | 7 plies |
| King's Gambit Declined: Falkbeer Countergambit, Charousek Gambit | C31 | 7 plies |
| King's Gambit Declined: Classical, Soldatenkov Variation | C30 | 7 plies |
| King's Gambit Declined: Norwalde Variation, Schubert Variation | C30 | 7 plies |
| King's Gambit Declined: Falkbeer Countergambit, Anderssen Attack | C31 | 7 plies |
| King's Gambit Declined: Classical Variation, Rubinstein Countergambit | C30 | 8 plies |
| King's Gambit Declined: Classical, Hanham Variation | C30 | 8 plies |
| King's Gambit Declined: Hobbs-Zilbermints Gambit | C30 | 8 plies |
| King's Gambit Declined: Falkbeer Countergambit, Pickler Gambit | C31 | 8 plies |
| King's Gambit Declined: Panteldakis Countergambit, Shirazi Line | C30 | 8 plies |
| King's Gambit Declined: Falkbeer Countergambit, Charousek Gambit, Old Line | C32 | 9 plies |
| King's Gambit Declined: Falkbeer Countergambit, Charousek Gambit, Keres Variation | C32 | 9 plies |
| King's Gambit Declined: Falkbeer Countergambit, Rubinstein Variation | C31 | 9 plies |
| King's Gambit Declined: Falkbeer Countergambit, Charousek Gambit Accepted | C32 | 9 plies |
| King's Gambit Declined: Norwalde Variation, Bücker Gambit | C30 | 9 plies |
| King's Gambit Declined: Panteldakis Countergambit, Symmetrical Variation | C30 | 11 plies |
| King's Gambit Declined: Falkbeer Countergambit, Charousek Gambit | C32 | 11 plies |
| King's Gambit Declined: Classical Variation, Euwe Attack | C30 | 11 plies |
| King's Gambit Declined: Falkbeer Countergambit, Charousek Gambit, Morphy Defense | C31 | 12 plies |
| King's Gambit Declined: Panteldakis Countergambit, Pawn Sacrifice Line | C30 | 11 plies |
| King's Gambit Declined: Classical, Réti Variation | C30 | 13 plies |
| King's Gambit Declined: Falkbeer Countergambit, Charousek Gambit, Main Line | C32 | 14 plies |
| King's Gambit Declined: Falkbeer Countergambit, Charousek Variation | C32 | 15 plies |
| King's Gambit Declined: Falkbeer Countergambit, Tarrasch Variation | C32 | 16 plies |
| King's Gambit Declined: Classical, Svenonius Variation | C30 | 16 plies |
| King's Gambit Declined: Falkbeer Countergambit, Alapin Variation | C32 | 17 plies |