1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6
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I don't understand any of the people here that post fools mate they made with a particular opening and saying that because of that the opening is good.
Anyhow, 3...Nf6 is an acceptable idea, there is also a little trap for blitz games that goes like this:
Anyhow, very acceptable move, not any special or super tactical move.