The Latvian Gambit is a very aggressive opening defense for black against one of the more common openings for white. This opening is not seen much at master level chess as most masters refuse to give up material early on in a game...
1.e4 e5 2.Nf3 f5 3.Nxe5 Nc6 4.Qh5+ g6 5.Nxc6 dxc6 6.Qe2 Bg7
7.exf5 Ne7 8.fxg6 Bf5 9.gxh7 Qd7 10.Qh5+ Bg6 11.Qh3 Nf5 12.Qd3
Qf7 13.Qc4 Qf6 14.Nc3 O-O-O 15.d3 Rde8+ 16.Be3 Rxe3+ 17.fxe3
Nxe3 18.Qa4 Rf8 19.Be2 Qxc3+ 20.bxc3 Bxc3# 0-1