Chess Opening Theory/1. e4/1...e5/2. Nf3/2...f5/3. Nxe5/3...Qf6/4. Nc4/4...fxe4

= Latvian Gambit, Leonhardt Variation =

4...fxe4
Black threatens to play ...d5 with beautiful development and only a slightly misplaced queen to worry about. But /5. Nc3/ covers d5 and gains further time by hitting the e4-pawn. Rarely do such delicate works as Black's encounter such a robust spanner as 5. Nc3.