Kolossi Gambit

The Kolossi Gambit involves a fascinating double-check at the early stage of the game. 

1. e4, e5
2. Nf3, Nc6
3. Bb5, Nf6
4. 0-0, d6
5. d4, Nxe4
6. d5!, a6
7. Bd3 ....

A lesson in tempo.  Now, Black has to save two pieces instead of one.

7. .... Nf6
8. dxc6, e4
9. Re1, d5
10. Be2 ....

A gambit.  White tries to lure Black into capturing the f3 Knight.

10. .... exf3
11. cxb7, Bxb7

If 11......fxe2, then 12. bxa8=Q and White has the material advantage.

12. Bb5+ mate.

Marvelous!