The Cunningham Defense, Bertin Gambit is a variation of the King's Gambit Accepted, catalogued as ECO C35. The line runs 1. e4 e5 2. f4 exf4 3. Nf3 Be7 4. Bc4 Bh4+ 5. g3 fxg3 6. O-O gxh2+ 7. Kh1, reaching the position shown below after 13 half-moves.
White holds the centre with pawns on e4. Development is level at two minor pieces each, and Black is up three points of material. It is Black to move after seven moves. Black has doubled pawns on the h-file.
On the King's Gambit Accepted generally: A romantic opening where White sacrifices a pawn for rapid development and attacking chances.
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The Cunningham Defense, Bertin Gambit goes 1. e4 e5 2. f4 exf4 3. Nf3 Be7 4. Bc4 Bh4+ 5. g3 fxg3 6. O-O gxh2+ 7. Kh1. It is a variation of the King's Gambit Accepted and is catalogued as ECO C35.
The Cunningham Defense, Bertin Gambit is ECO C35. ECO codes group openings by their move order, so nearby codes cover closely related lines of the King's Gambit Accepted.
Stockfish evaluates the position after 1. e4 e5 2. f4 exf4 3. Nf3 Be7 4. Bc4 Bh4+ 5. g3 fxg3 6. O-O gxh2+ 7. Kh1 at -0.50 at depth 18, which is a slight pull for Black, within normal opening margins. Engine evaluation is only a starting point — at club level the practical value of a line is mostly about whether you know its plans better than your opponent does.
White holds the centre with pawns on e4. Development is level at two minor pieces each, and Black is up three points of material. It is Black to move. Black has doubled pawns on the h-file.