1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 Bf5 6.Ne5 c6 7.g4 Be6 8.g5 Nd5 9.Ne4 Nd7 10.Nxd7 Qxd7 11.Nc5 Qd6 12.Bg2 Nf4
As I mentioned earlier here I had to pick one out of at least 4 quite different moves. 12...Nf4 is definitely the most forcing and complicated move, but I feel that it is justified considering that one cannot really say that white is better developed at all. Things might get a bit messy, but my analysis seems to indicate that black is fine.

The main alternative was 12...g6, which is certainly quite senisble, too, but on the other hand there is the risk that white might secure a certain space advantage that might offer him more compensation for his sacrificed pawn than he deserves. It's not like the black position really has any problems after 12...g6, but I've decided I'd like some more active play. In the end I simply don't know for sure whether 12...g6 or 12...Nf6 is better.

Lesser alternatives are 12...0-0-0 and 12...b6, about these I have certain suspicions (and some variations that at least look very much like what white is aiming for when playing the BDG). The former comits a bit earlier than necessary to castling queenside and the latter move does weaken the queenside a bit.

Ah, Patrik, you are not without support. This reminds me: why is Teyko silent? He is responsible for about 40% of the posts in older BDG threads.

1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 Bf5 6.Ne5 c6 7.g4 Be6 8.g5 Nd5 9.Ne4 Nd7 10.Nxd7 Qxd7 11.Nc5 Qd6 12.Bg2

  Nowadays I´m out of my computer but on Monday evening I´m probably going to send some illustrative analysis of 11..Qc8 line showing ways how white can obtain initiative.

I like these discussions:) Well, I can also uncover my cards in hand a little... I´ve analysed both continuation (11..Qd6 and 11..Qc8) and I cannot decide which one is better because I think there are about equal in value. White has good compensation in both lines At first sight, Qd6 looks more active and Qc8 looks weird for me (maybe computer´s are trying to cover b7 pawn, but this might not be necessary as there are just very few lines where white can take the pawn). The game starts to be very interesting.

I think Black is doing well after 11...Qd6, as long as he follows up with the most active moves (12.Bg2 g6):

1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 Bf5 6.Ne5 c6 7.g4 Be6 8.g5 Nd5 9.Ne4 Nd7 10.Nxd7 Qxd7 11.Nc5 Qd6

12.Bg2 g6! 13.0-0 [13.c4 Nc7 14.0-0 Bg7!] 13...Bg7 14.c4 [14.c3 Bc8] Nb6 15.Nxb7 Qxd4+ 16.Qxd4 [16.Kh1 0-0 17.Bxc6 Bxc4] 16...Bxd4+ 17.Kh1 Rc8

After looking at the position a little more, I think Black should be careful about committing the rook on Rb8, and should play ...g6 and ...Bg7 as quickly as possible.

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Here I have once more the choice between a more solid move (11...Qc8) and a more active move (11...Qd6). The latter does allow quite some complications, but as far as I can tell so far black doesn't have to worry about that. On the plus side 11...Qd6 allows a great many different options for black while 11...Qc8 does limit black's option slightly. Quite possibly once more both moves are entirely playable, but I'll think about it some more.

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In the line you give 12...Bh3 is also interesting in order to keep the white king in the center a bit longer (I mean, is the white bishop actually well placed on f3?!), after all 12...Bxf3 does help white with unravelling his slightly weird position. In the 12...Bxf3 I would not play something like 13...Nb4 over-the-board (maybe in correspondence chess, if I'm really convinced by it).

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Well, I believe there should be several ways of equalising, e.g. in our current position there was nothing much wrong with 10...Bxd7 (it just seems a bit slow, but that doesn't seem to be much of a problem). However after some analysing about, I personally prefer 10...Qxd7 simply because it is more straightforward and potentially might give me some additional choices.

1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 Bf5 6.Ne5 c6 7.g4 Be6 8.g5 Nd5 9.Ne4 Nd7 10.Nxd7 Qxd7

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Since 10. g6 would not have worked, I'm not sure what I would have recommended to White.