King's Gambit Accepted: Kieseritzky Gambit, Berlin 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 Nf6.

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6.d4 1 line
- C39 Rubinstein Variation
6.Nxg4 1 line
- C39 de Riviere Variation

About this opening

King's Gambit Accepted: Kieseritzky Gambit, Berlin 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 Nf6.

It belongs to the King's Gambit Accepted family. Within that family this is a level-2 branch (the Kieseritzky Gambit → Berlin Defense line). The immediate parent line is King's Gambit Accepted: Kieseritzky Gambit, transitioned via 5…Nf6.

The opening sequence in prose form: 1.e4 e5, 2.f4 exf4, 3.Nf3 g5, 4.h4 g4, 5.Ne5 Nf6. From this position 2 named continuations are recorded in the encyclopaedia, each leading to a distinct theoretical line.