Tanaha wrote on 07/14/12 at 20:27:20:
Just two days ago my opponent played this in a blitz game. My reflex was this 5...ef3 6.Nf3 c5 idea. But now after a few minutes of analysis my move is going to be 5...Bc5 6.Qe2 Nc6 7.Nxe4 Nxe4 8.fxe4 e5. I like black here.
I admit that I haven't really considered
5...Bc5, so it's good you mentioned it!
One solution for White could be
6.fxe4 6...Nc6 7.Bb5 Bd7 8.Nf3 seems alright to me.
More interesting complications results from
6...e5 7.Nf3 Ng4!? 8.Bc4!? If the following amazing sac stands up to closer scrutiny then 5.f3 may soon be the new mainline!
i.e:
8...Nf2 9.Bxf7+! 9...Kf8 (9...Kxf7 10.Nxe5+)
10.Qe2 Nxh1 11.0-0-0 Nf2 12.Rf1 Kxf7 13.Nxe5+ Ke8 14.Qb5+ and it seems that White has more than enough for the rook!
Another perhaps obvious point that still may be worth mentioning, is that if Black wants to avoid the issue with 5.f3 Bc5 he may also need to consider his options vs the ML move order 5.Qe2 and then 6.f3 or 6.0-0-0 and then 7.f3.
If I remember correctly, I mentioned the f3 idea vs some 5th moves in the FRG, but even there it's so rare that the surface has barely been scratched...