The Smith Morra Gambit is a sharp and aggressive line against the Sicilian Defense from black. If you play e4 as white for any length of time you probably run into the Sicilian Defense quite often.
This gambit is only for very aggressive players as are most gambits. White looks to not only take black out of the normal sicilian lines but also looks to use the advantage in development to overwhelm the black king.
White usually looks to put his bishop on c4 (attacking the weak pawn on f7). Then looks to castle king side after his knight comes to f3. Then eventually his rooks would like to come to the open c file and the semi open d file. After this white will have a lot of attacking lines at his disposal.
1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.c3 dxc3 5.Nxc3 Nc6 6.Bc4 e6 7.Bf4
a6 8.a4 Be7 9.Qd2 Nf6 10.Rd1 Qa5 11.Bxd6 Bxd6 12.Qxd6 Nxe4
13.Qa3 Nxc3 14.bxc3 Qc7 15.O-O Qe7 16.Rd6 O-O 17.Qc5 Re8
18.Rfd1 h6 19.Qb6 e5 20.Ne1 e4 21.Be2 Be6 22.Qe3 Rac8 23.R1d2
Na5 24.h3 Qg5 25.Qxe4 Nb3 26.Rb2 Nc5 27.Qf3 Bb3 28.Rb1 Qe7
29.Rd2 Bxa4 30.Bc4 Bc6 31.Qg4 Qe4 32.Qxe4 Nxe4 33.Rd3 Rcd8
34.Rxd8 Rxd8 35.Rc1 b5 36.Bd3 Nc5 37.Bc2 Rd2 38.Rd1 Rxd1
39.Bxd1 a5 40.Kf1 a4 41.Nc2 Ne4 42.Bf3 Nd2+ 43.Ke2 Nxf3
44.gxf3 g5 45.Na3 Kg7 46.Ke3 h5 47.f4 Kg6 48.f3 h4 49.fxg5
Kxg5 50.f4 Kf5 51.Nc2 Bd7 52.Na3 Kf6 53.Kf3 Ke7 54.f5 Bxf5
55.Nxb5 Bxh3 56.c4 Bd7 57.Na3 Kd6 0-1