Originally posted by SquelchbelchCurrently the critical line appears to be 8...Nf6 (black has reasonable alternatives) 9.hxg5 Nh5! (9...Nxe4 10.Bd5!) 10.g6 fxg6 11.Qb3.
1.e4 e5 2.f4 exf4 3.Nf3 d6 4.Bc4 h6 5.0-0 g5 6.d4 Bg7 and then 7.h4 Nc6 8.c3 is one perfectly "sound" way for White to deal with this defence.
[fen]r1bqk1nr/ppp2pb1/2np3p/6p1/2BPPp1P/2P2N2/PP4P1/RNBQ1RK1 w - - 0 1[/fen]
I have played this line once or twice with both sides on RHP. It should be noted that white does not need to allow this set-up for black.