The Kieseritzky Gambit, Brentano Defense is a variation of the King's Gambit Accepted, catalogued as ECO C39. The line runs 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 d5 6. d4 Nf6 7. Bxf4, reaching the position shown below after 13 half-moves.
Both sides have pawns in the centre (White on d4 and e4, Black on d5), and one pawn capture is available, so the structure has not settled yet. Development is level at two minor pieces each. It is Black to move after seven 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 Kieseritzky Gambit, Brentano Defense goes 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 d5 6. d4 Nf6 7. Bxf4. It is a variation of the King's Gambit Accepted and is catalogued as ECO C39.
The Kieseritzky Gambit, Brentano Defense is ECO C39. 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. h4 g4 5. Ne5 d5 6. d4 Nf6 7. Bxf4 at +0.24 at depth 18, which is balanced. 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.
Both sides have pawns in the centre (White on d4 and e4, Black on d5), and one pawn capture is available, so the structure has not settled yet. Development is level at two minor pieces each. It is Black to move.