Dear BlackWidow,

   Your first variation must be covered by main-line Bird/Reversed Dutch  theory. As I am no expert in this field, I leave it to others to comment on this.
   I agree that the development of the K Knight must be best geared towards a Reversed Leningrad, but I'm sure Appleberry has something up his sleave versus the Classical and Stonewall as well. I'll transmit his thoughts when I next hear them. 

Regarding 1. f4 d6 ; 2. Ktf3 e5 ; 3. fe g5 ; 4. h3 de (4. ...Ktc6 is to be considered as well) ; 5. e4 , I consider Black to be at least equal, and probably somewhat better after for example 5. ...Bc5. Will look into this more deeply, but I'm sure it's not a critical test.

                                                                 Regards,
                                                                      Hubert

Uberdeker, you really made me think, so I did some analyzing during the weekend. 1. f4 d5 2. Nf3 g6 and then keeping the option open where the Knight goes, looks very interesting. Against the Leningrad Bird I found the following interesting continuation:
1. f4 d5 2. Nf3 g6 3. g3 Bg7 4. Bg2 Nd7 5. O-O e5 6. fxe5 Nxe5 7. Nxe5 Bxe5 8.
d4 Bg7 9. Nc3 c6
However against the I-Z Bird, I could not find convincing variations with Nh6. It also does not have a good reputation, but that is maybe not correct. For sure you will have an opinion here.

The following I find interesting as an answer to 1 ... d6. 
1. f4 d6 2. Nf3 e5 3. fxe5 g5 4. h3 dxe5 5. e4 and I think white is fine here. Some remarks?

1. f4 d6 2. d4 e5 looks like a promissing gambit for Black. I am not fond on playing gambits, but this one I believe for Black.

Dear Lev,

 I was aware from previous posts of your singular egocentricity, but this is just too much. The point of fora such as these is to discuss matters with people who share the same interests. But obviously, you are only interested in spouting obscenely self-promoting monologues.
If you had had the decency of reading the posts which preceded yours, you would be aware of the fact that I was not asking your opinion on your own gambit - as we all know how highly you regard the junk that you have developped- but on 1. f4 d6 ; 2. Ktf3 e5.
But I have been generous (naïve?) enough to give you my views on 1. f4 h6. I have pointed out that both 2. d3 and 2. Ktc3 g5 ; 3. d4 (which you have once again chosen to ignore) are very promising for White. 
I have also stated that the only satisfactory answer to 2. e4 is 2. ...d5! Indeed this is actually better for Black. Now you post a whole string of different recommendations, each one more dubious than the next.
After  2. ...g5 ; 3. d4 White is close to winning.  2. ...c6, 2. ...g6 and other moves just make the ...h6 tempo useless at best.
[b]This is the last time I am repeating myself. We can go back to 1. ...h6"!" when we have finished discussing 2. ...d6[/b]

Dear Laughingcow,

 1. f4 h6 ; 2. e4 d5 ; 3. d4 de is certainly no improvement on the BDG! Black's e-pawn can no longer be dissolved with -f3. And now it's passed...
3. ed Qxd5 ; 4. c4 creates yet more holes in White's position, quite apart from the fact that it hangs a pawn to 4. ...Qe4+.
Please cf. reply #10 for more details. The only difference with 1. f4 d6 ; 2. e4 d5 is that black's pawn is on -h7 in those lines. It's no great help to have it on -h6, but it's not really detrimental either - the fact that ...Kth6 is no longer available after 3. e5 is no big deal.
Anyway, Lev must be happy. His hijack is succeding. I was the first to put forth a gambit line in this thread and I feel I have the right to be refuted before him!

                                                               Regards,
                                                                  Hubert

Dear Lev,

2. d3 is certainly not "chickening out". It seems to be the best way to accept the gambit. Furthermore, you will never reach "mainline continuations" following 1. ...h6
In your lines A) and C) the move ...h6 is little more than a wasted tempo. In line B) Black's compensation is subject to serious doubt. I will be happy to discuss these issues as well as the line 2. Ktc3!? g5 ; 3. d4 which you have chosen to ignore, once you have given your opinion on 1. ...d6/2. ...e5 and other subjects relevant to this thread. For the moment you have hijacked it long enough.

                                                                 Regards,
                                                                       Hubert

P.S. Laughingcow, I quickly modified that post after sending it. 2. ...d5 is good for Black

                                                       

Hmmm... I have some games with 1 f4 h6 2 d3 g5 3 fg hg 4 Bg5 in my collection. In response to your
inquiry I point out the following:

After 1 f4 h6 2 d3 Black can:

A) Play 2...d5, avoiding the 2...g5 line altogether. Perhaps the ...g5 line can be delayed for later in the game.

B) Still play 2...g5, where after 3 fg play divides:

  B1. 3...d5 with a later ...hg5 

  B2. 3...hg  4 Bg5 Bh6

C) Play something other than 2...d5 or 2...g5 . For example, 2...b6, 2...d6, 2...Nc6 or even 2...Nf6

You should know that 1...h6 is both a provocative and a waiting move. Thus, if White plays 2 Nf3, then you can play 2...g5 and after 3 fg5 hg5 Black has open lines for attack. But if White chickens out with 2 d3, then Black can switch to more mainline continuations.

Regards,

Lev 

Dear Lev,

  Instead of promoting the same old unsound lines post after post, why not give your expert opinion on the subject at hand? I very rarely play gambits this early in the opening and welcome the thoughts of those who do so on a regular basis, especially since our respective lines have this in common : they attempt to improve on existing ones.
  In return, I will give my opinion on your variation : 1. f4 h6 ; 2. Ktf3 g5 ; 3. fg hg ; 4. Ktxg5 gives Black some positional compensation in the form of open lines. It is however much more speculative than 1. ...d6/2. ...e5 in that Black lacks concrete targets and has also weakened his own structure to some extent.
  But a better way to accept the pawn is 2. d3 g5 ; 3. fg hg ; 4. Bxg5 when I wonder who has the "lead in development".
  By the way, 2. e4 has previously been advocated on this forum as the right way to deal with your conception. You have then insisted on 2. ...g5, when 3. d4 gf ; 4. Bxf4 leaves with White an overwhelming position, but simply 2. ...d5 (analogous to 1. f4 d6 ; 2. e4 d5) gives Black the better game.
 Likewise, the rash 2. d4 is met by 2. ...d5, but an attractive alternative is 2. Ktc3!? g5 ; 3. d4, again with a very promising game for White.  

                 Regards,
                              Hubert