Kieseritzky Gambit, Rosenthal Defense

The Rosenthal Defense, 5...Qe7, attacks the knight on e5 and places the queen on the e-file against White's center. Black usually wins back a pawn, but the queen exchange that tends to follow removes much of Black's counterplay and turns the doubled f-pawns into a long-term liability. White divides almost evenly between 6. d4, supporting the knight, and 6. Nxg4, collecting the g-pawn. Black has scored better against 6. d4. Engines rate the position as roughly balanced, and the line is rarely played.