Not sure how much help that'll be...but good luck!
Scotch & Danish Gambit
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This looks pretty dangerous for black after the third pawn is taken.
Smartens: I don't think black needs to worry much about that line: after 7.Qh5+ g6 8.Qf3+ Nf6 9.e5 Nxe5 10.Bxe5 Bg7 black is better developed and up in material. But even if black doesn't return the piece, white can hardly hope for more than a draw, he simply doesn't have enough pieces in the attack.
That is an interesting suggestion, but have you given any thought to the possibility of 4...Bb4 5.Bxf7+ that I mentioned in my earlier posts?