The Rosentreter Gambit, Testa Variation 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. Bxf4, reaching the position shown below after 9 half-moves.
White holds the centre with pawns on d4 and e4. White is ahead in development, with two minor pieces out to Black's zero. It is Black to move after five moves.
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, Testa Variation goes 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. d4 g4 5. Bxf4. It is a variation of the King's Gambit Accepted and is catalogued as ECO C37.
The Rosentreter Gambit, Testa Variation 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. Bxf4 at -1.06 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. White is ahead in development, with two minor pieces out to Black's zero. It is Black to move.