After 1 e4 e5 2 Nf3 Nc3 3 Bc4 Nf6 4 Ng5, unexpectedly Black plays Nxe4. Then if 5 Nxf7 Qh4! with interesting complications. I have won many games as Black from that position. It is fun to play in blitz chess. Of course the main point is that if 5 Nxe4, d5!
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