The Double Muzio Gambit, Paulsen Defense 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. Bc4 g4 5. O-O gxf3 6. Qxf3 Qf6 7. e5 Qxe5 8. d3 Bh6 9. Nc3 Ne7 10. Bd2 Nbc6 11. Rae1, reaching the position shown below after 21 half-moves.
The four central squares are empty of pawns, so the fight for them is being conducted by pieces. Development is level at four minor pieces each, and Black is up four points of material. It is Black to move after 11 moves. White has castled while Black’s king is still uncommitted; Black has doubled pawns on the f-file; Black’s f- and h-files pawns are isolated; the e-file file is fully open.
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 Double Muzio Gambit, Paulsen Defense goes 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. O-O gxf3 6. Qxf3 Qf6 7. e5 Qxe5 8. d3 Bh6 9. Nc3 Ne7 10. Bd2 Nbc6 11. Rae1. It is a variation of the King's Gambit Accepted and is catalogued as ECO C37.
The Double Muzio Gambit, Paulsen Defense 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. Bc4 g4 5. O-O gxf3 6. Qxf3 Qf6 7. e5 Qxe5 8. d3 Bh6 9. Nc3 Ne7 10. Bd2 Nbc6 11. Rae1 at -1.64 at depth 18, which is a clear advantage 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.
The four central squares are empty of pawns, so the fight for them is being conducted by pieces. Development is level at four minor pieces each, and Black is up four points of material. It is Black to move. White has castled while Black’s king is still uncommitted; Black has doubled pawns on the f-file; Black’s f- and h-files pawns are isolated; the e-file file is fully open.