King's Gambit

This opening is a variation of King's Gambit Accepted.

1. e4, e5
2. f4, exf4
3. Nf3, d5
4. Nc3, dxe4
5. Nxe4, Bg4
6. Qe2 ....

White rightfully sees the e-file as an avenue for attack.

6. .... Bxf3
7. Nf6 mate.