King's Gambit Accepted: Kieseritzky Gambit, Brentano Defense

An entry in the Encyclopedia of Chess Openings (ECO C39), reached after 10 half-moves: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 d5.

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6.d4 1 line
- C39 Caro Variation

About this opening

King's Gambit Accepted: Kieseritzky Gambit, Brentano Defense is an opening in the Encyclopedia of Chess Openings, classified under code C39. ECO group C (C00–C99) covers open games (1.e4 e5) and the French Defence, including the Ruy Lopez, Italian, Scotch and King's Gambit. This particular variation is reached after 10 half-moves from the starting position, with the move sequence 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 d5.

It belongs to the King's Gambit Accepted family. Within that family this is a level-2 branch (the Kieseritzky Gambit → Brentano Defense line). The immediate parent line is King's Gambit Accepted: Kieseritzky Gambit, transitioned via 5…d5.

The opening sequence in prose form: 1.e4 e5, 2.f4 exf4, 3.Nf3 g5, 4.h4 g4, 5.Ne5 d5. From this position exactly one named continuation is recorded in the encyclopaedia.