The Rosentreter Gambit, Bird Gambit is a variation of the King's Gambit Accepted, catalogued as ECO C37. The line runs 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. d4 g4 5. Ne5 Qh4+ 6. g3, reaching the position shown below after 11 half-moves.
White holds the centre with pawns on d4 and e4, and one pawn capture is available, so the structure has not settled yet. Development is level at one minor pieces each, and Black is up a pawn of material. It is Black to move after six moves. Black has doubled pawns on the f-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 Rosentreter Gambit, Bird Gambit goes 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. d4 g4 5. Ne5 Qh4+ 6. g3. It is a variation of the King's Gambit Accepted and is catalogued as ECO C37.
The Rosentreter Gambit, Bird Gambit is ECO C37. 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 g5 4. d4 g4 5. Ne5 Qh4+ 6. g3 at -0.62 at depth 18, which is a small but real edge for Black. 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 d4 and e4, and one pawn capture is available, so the structure has not settled yet. Development is level at one minor pieces each, and Black is up a pawn of material. It is Black to move. Black has doubled pawns on the f-file.