Thx Mnb,
I am not so sure about the pawnsac 7.d4,Bxd4
(1.e4.e5 2.Nf3,Nc6 3.Bc4,Nf6 4.Ng5,Bc5 5.Bxf7+,Ke7 6.Bd5,d6 7.d4,Bxd4)
r1bq3r/ppp1k1pp/2np1n2/3Bp1N1/3bP3/8/PPP2PPP/RNBQK2R w KQ -
It seems to me that after
8. c3, Bb6
9.Nf7,Qf8
10.Bg5,Rg8 Again 10.Nxh8 is not to be recommended: 10....Nxd5
11.Qh5 White's advantage seems not so clear to me
11......, h6 Natural
12.Bxf+,gxf And now neither 13.Nxh6,Rg5 nor 13.0-0,Bg4 look very appealing.
Instead white might choose to continue
8.Nf3!?, Bb6 9.Bg5,Qe8 10.Nh4 (unclear) as in Sergeev (2506)-Simacek (2402);Olomouc 2001
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All in all I still think 7.c3 is best. This move was GM-tested in
Karpov-Beljavski 1983 [
a game not included in Estrins monograph 
]