Chess Opening Theory/1. e4/1...c6/2. d4/2...d5/3. Nc3/3...dxe4/4. Nxe4/4...Nd7/5. Ng5

5.Ng5 !?
This is an interesting move, with chances to blow Black off the Board. Even Kasparov got blown with a crushing knight sacrifice.

For the interested people, the game followed:
1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nd7 5.Ng5!? Ngf6 6.Bd3 e6 7.N1f3 h6? (this allows a crushing sacrifice) 8.Nxe6! Qe7?! 9.0-0 fxe6 10.Bg6+ Kd8 (White has a winning attack) 11.Bf4 b5 12.a4 Bb7 13.Re1 Nd5 14.Bg3 Kc8 15.axb5 cxb5 16.Qd3 Bc6 17.Bf5 exf5 18.Rxe7 Bxe7 19.c4 1–0