Black can play the Scandinavian Defence (or Centre Counter) as a gambit, with 1.e4 d5 2.exd5 (2.d4 transposes to the Blackmar-Diemer Gambit, but taking on d5 is objectively best, for as noted in earlier blogs, the BDG is probably not 100% sound) 2...Nf6.
Black's main weapons here are the Icelandic or Palme Gambit with 3.c4 e6!?, and the Portuguese or Jadoul Gambit with 3.d4 Bg4!?. I think that 3.c4 e6 is fully sound, while 3.d4 Bg4 probably does not give Black full compensation for the pawn, but both lead to similar play and can produce many entertaining victories.
The following game of mine in the 3.d4 Bg4 variation, however, was a disappointment, as I lost after spurning a couple of good chances:
This game followed one of the most critical lines for the assessment of the 3.d4 Bg4 variation, although Black can also consider meeting 6.c4 with 6...a6. I played 16...Kb8 to avoid any tricks involving snaring the black king with Bf2-g3, but 16...Bd6 would have been a better way of covering this threat, for while ...Kc8-b8 is often a good prophylactic move after castling queenside, in this particular position it left Black vulnerable to tactics on c6 and b7. Then I somehow missed 20...Nd2, which would probably have left White with insufficient compensation for being an exchange down. In general, White is slightly better in this variation but it is not a serious threat to the soundness of 3.d4 Bg4. As Stefan Bücker has noted, 5.g4 is more theoretically critical, but it takes some guts to play this way as White, as the plan of cramping Black by pushing the kingside pawns forward leaves White's king lacking pawn cover.
I have added an article on these variations at my Gambiteers Guild website at http://tws27.weebly.com/scandinavian-gambits.html and plan to expand on most of that site's openings articles to make them into more of a Wikipedia-style overview, to cater for those who would prefer to get a good overview without having to read through annotated games. Although I have not got around to analysing any high-level games in these Scandinavian lines, I have added a PGN file containing 66 unannotated high-level games in the critical lines, to provide readers with good practical examples to browse through and reach your own conclusions about the practical chances that these lines offer..
I have started by expanding the discussion of the Albin Counter-Gambit at http://tws27.weebly.com/albin-counter-gambit.html. There's nothing really new here in terms of analysis, although again, I have added a PGN file for the benefit of those seeking high-level practical examples in the important lines, this time containing 95 games. It is an example of the sort of Wikipedia-style overview that I am thinking of. I also removed the comment along the lines of, "just a small edge for White with counterplay for Black", because as Mark Nieuweboer pointed out to me a while ago, there is considerable room for argument with that statement, depending on how attractive or unattractive one finds Black's game in the lines following 1.d4 d5 2.c4 e5 3.dxe5 d4 4.Nf3 Nc6 5.a3 and 5.Nbd2 (I believe that 5.Nbd2 is probably more accurate as 5...Nge7 and 5...Bf5 are both ineffective due to 6.Nb3, so Black should play 5...Bg4 or 5...Be6, whereupon 6.a3 follows, transposing back into 5.a3 lines). However, I think it is harder to be dismissive of Black's practical chances in the 5.g3 variation following either 5...Bf5 or 5...Nge7.
In the coming months I expect to add some discussion on my Gambiteers Guild site of some other gambit lines, including some in relatively mainstream openings, e.g. I am interested in quite a number of pawn sacrifice lines in the Queen's Gambit, Ruy Lopez, French Defence and Open Sicilian, and I expect also to be adding an overview of the Morra Gambit (1.e4 c5 2.d4 cxd4 3.c3) in the near future. I am also still yet to address the glaring omission of the Evans Gambit, which has been played a lot with success by Nigel Short. More offbeat stuff is likely too, e.g. I am envisaging covering the Latvian and Elephant Gambits at some stage (which, like the Englund Gambit, are theoretically bad, but have many followers who enjoy playing them and get good results despite their lack of soundness). I have been playing a fair number of "thematic" online games at Chess.com recently and experimenting with different openings at the chess club which has got me more interested in a wider range of openings. I doubt I will have the time to produce analysis of annotated games in many of those lines in the future (perhaps just the odd such article, like I did in the 5...Nxd5 line of the Two Knights Defence). However, I intend to maintain all of the analysis that I've already done on illustrative games, and keep the associated links working, and also produce PGN files containing a wide cross-section of relevant high-level games as a starting point for those with database and/or PGN software.