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I wonder why u focus on 4.Bc4 when we said there are several ways to refute this opening...
And don't think only GM know or are able to play it at the board : i have some pupils rated 1300 who would be able to do it.
I would rather go for 4.Nc3, as Negi suggests, because these lines are also useful against the Latvian gambit: 1.e4 e5 2.Nf3 f5? 3.Nc3, which is perfectly good for a large white advantage. 3...d6 4.d4 is a direct transposition.