I have very recently produced articles on what I call the "Scandinavian gambits" (arising from 1.e4 d5 2.exd5 Nf6). Although I play 1...e5 more often these days, I still sometimes wheel out these lines as well, and have had a recent outing in the line 1.e4 d5 2.exd5 Nf6 3.d4 Bg4 4.f3 Bf5 5.Bb5+ Nbd7 6.c4 e6 7.dxe6 fxe6 8.Ne2 c6 9.Ba4. Although I lost the game, the loss was not the fault of the opening, as I had a roughly equal position around move 15. I believe that this line is Black's best antidote to the 5.Bb5+, 6.c4 approach.
http://tws27.weebly.com/icelandic-gambit.htmlhttp://tws27.weebly.com/portuguese-gambit.htmlhttp://tws27.weebly.com/3rd-move-alternatives-for-white.htmlI am a club-level player, and set up this site mainly to provide introductions for club players who are interested in taking up these lines, but if any of my coverage proves helpful, by all means feel free to make use of it. I'm certainly interested in the upcoming book, as I feel that my enthusiasm for these lines, and opinions on their merits, are pretty similar.
My assessment of the line 1.e4 d5 2.exd5 Nf6 3.d4 Bg4 4.f3 Bf5 5.g4 Bg6 6.c4 e6 7.Nc3 cxd5 8.g5 Nh5 was, "8...Nh5 is the main alternative but then 9.f4 leaves the knight on h5 in danger of being trapped and chopped off. 9...Nc6 10.Be2 Nb4
(10...dxc4 11.Bxh5 Bxh5 12.Qxh5 Nxd4 13.Kf2 Bc5 gives Black some, but not enough, compensation for the piece due to White's exposed king, De Waele,W (1976)-Bukharin,A (1956) Lechenicher SchachServer 2010, where White covers most of the threats with 14.Be3) 11.Bxh5 Nc2+ 12.Kf2 Nxa1 13.Bxg6 hxg6 14.cxd5 with advantage for White, Oreopoulos,K (2375)-Bensiek,N (2348) ICCF email 2011".
Indeed, 9...dxc4 10.Be2 Nc6 merely transposes. I think Black's best tries are possibly 7...Bd6 (e.g. 8.Nge2 0-0 9.h4 h6 10.dxe6 Nc6 11.Bh3 fxe6 12.g5) and 8...Nfd7 9.Nxd5 Nc6 10.h4 Bd6 (e.g. 11.Ne2 Ne7 12.h5 Bf5 13.Be3 c5 14.d5). The resulting positions are better for White, but I wouldn't mind taking Black in practice, because White's plan of pushing the kingside pawns forward leaves the white king without a reliable pawn shelter, which will always provide Black with some practical chances.
I agree that 4.Bb5+ Nbd7 5.Be2 is a pretty dull line, especially as I couldn't make the bolder approaches with ...0-0-0 work for Black. My attempt ran, 5...Bxe2 6.Qxe2 Nxd5 7.c4 N5f6 8.Nc3 c6 9.Nf3 Qc7 10.0-0 e6 11.d5 0-0-0 12.dxc6 bxc6 13.Rd1, and I didn't find Black's position very appealing, with minimal pawn shelter in front of the black king. Indeed, if I ever face that line I may well be tempted to chance it with 4...c6, which, though unsound, is not as bad as I previously thought it might be.
My examinations of the line 3.Nf3 Bg4 suggest to me that it is no better or worse than 3.d4 Bg4 (in either a theoretical or practical sense) so I think it is an entirely reasonable and consistent recommendation.