Wasn't looking for a moment, and hell broke loose in the Fyfe thread. Thanks for all the contributions, I'll soon reply. And thanks to Tony for changing the thread's title. - The 4...d6 thingy is a fundamental approach, and I admit that I like the move. In the similar gambit
1.e4 e5 2.Nc3 Nc6 3.g3 d5!? 4.Nxd5 I'd prefer White after 4...f5 5.d3!. So in that case, with g2-g3 already played, I'd prefer the other treatment
4...Be6 5.Bg2 Nf6, with some compensation for the pawn. I'll check whether the extra tempo in the Fyfe Gambit after 4.f4 d6 changes the picture.
PS. My database has not a single game with 3...d5. Another CB defect?
Markovich wrote on 07/22/12 at 02:50:19:
Interesting is 5.exd5 Bg4!?
An interesting idea.
6.Qxg4 Practically forced, as 6.Be2 Nxe2 7.Ngxe2 Bb4 looks good for Black.
6...Nxc2+ 7.Kf2 Bc5+ 8.Kg3 Nf6 (8...Nh6 9.Qh5 is good for White)
9.Qe2 Qd7. Black can play differently, but I don't see problems for White, e.g. 9...Nxa1 10.fxe5 Nd7 11.Nf3 etc.
10.fxe5 Nd4 11.Qd1 Nf5+ 12.Kh3!. For example
12...Ne3+ 13.e6 fxe6 14.Qa4! +/-. Markovich wrote on 07/22/12 at 02:03:21:
@Stefan: Does White really have comp after 14.Nf3 Nxe7 15.Rxe2 Qd7?
I guess you mean
14.Nf3 Nxe2+ 15.Rxe2 Qd7. Here the computer recommends
16.Ne5 Qh3 17.Nd5 Bb6 18. Nd3, leading to equal play. White has other options, e.g. 18.Nf3 or 18.g4!? f6 19.Nxb6 axb6 20.Re3 Qh4 21.Rg3 fxe5 22.Bg5, unclear.