The Hamppe-Muzio, Dubois Variation is a variation of the Vienna Game, catalogued as ECO C25. The line runs 1. e4 e5 2. Nc3 Nc6 3. f4 exf4 4. Nf3 g5 5. Bc4 g4 6. O-O gxf3 7. Qxf3 Ne5 8. Qxf4 Qf6, reaching the position shown below after 16 half-moves.
White holds the centre with pawns on e4. White is ahead in development, with three minor pieces out to Black's one, and Black is up two points of material. It is White to move after eight moves. White has castled while Black’s king is still uncommitted; Black’s f- and h-files pawns are isolated.
On the Vienna Game generally: White delays Nf3 in favor of Nc3, keeping options open for a kingside attack with f4.
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The Hamppe-Muzio, Dubois Variation goes 1. e4 e5 2. Nc3 Nc6 3. f4 exf4 4. Nf3 g5 5. Bc4 g4 6. O-O gxf3 7. Qxf3 Ne5 8. Qxf4 Qf6. It is a variation of the Vienna Game and is catalogued as ECO C25.
The Hamppe-Muzio, Dubois Variation is ECO C25. ECO codes group openings by their move order, so nearby codes cover closely related lines of the Vienna Game.
Stockfish evaluates the position after 1. e4 e5 2. Nc3 Nc6 3. f4 exf4 4. Nf3 g5 5. Bc4 g4 6. O-O gxf3 7. Qxf3 Ne5 8. Qxf4 Qf6 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.
White holds the centre with pawns on e4. White is ahead in development, with three minor pieces out to Black's one, and Black is up two points of material. It is White to move. White has castled while Black’s king is still uncommitted; Black’s f- and h-files pawns are isolated.