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Whenever their is a dubious sign that means analyzers think it is a mistake but need more analysis.I can not explain much except that I recommend do not play this in your games. Blocking the d pawn.

Bb4
1. e4 e5 2.Nf3 Bd6 3.d4 exd4 4.Nxd4 Nc6 5.Nc3 Nge7 6.Ndb5 Bb4 7.a3 Ba5 (7...Bxc3+ 8.Nxc3 leaves Black without bishop pair) 8.b6 a6 (8...Bb6 9.Na4 and black bishop can`t escape exchange)
9.Nd6+! cxd6 10.bxa5 Qxa5 11.Qd2! 0-0 12.Bb2
White has a bishop pair while Black has bad bishop and 2 horrible pawns on d-file.

1. e4 e5 2.Nf3 Bd6 3.d4 exd4 4.Nxd4 Nc6 5.Nc3 Be5 6.Nf3 and black can choose between giving up bishop pair with 6...Bxc3 7.bxc3 and problems to develop kingside after 6...Bf6 7.Nd7

Here's a fun idea to exploit the blocked d pawn... instead of 3.d4, play 3.Nc3 instead. The idea is to wait for Black to play ..Nf6 and then meet it with g2-g4 at a moment when g7 is hanging so ..Nxg4 Rg1 is unattractive. Black's QB cannot participate in the kingside action for a few moves, and Black can't really break in the center to counter White's flank advance.
Does Black allow White to kick the knight with g4-g5 or does he spend a move on ..h6?
If Black doesn't play 3...Nf6 White can continue to stealthily wait with moves like Bc4, d3, and a3 I suppose.

And what to do if black develops kingside knight on e7?
Good question. If my bishop were already on c4, I'd play Ng5 winning material (..d5's impossible and ..O-O would be met by Qh5).
So I assume you mean 3...Ne7. Maybe 4.Nb5 threatening to chop on d6 then. If the B moves, e5 hangs.

3.Nc3 Nf6 4.g4? is too flashy to be true.
Black can play 4...h6, but 4...Bc5! looks even better, when after 5.Nxe5 (what else?)
Flashy, yes, but it is somewhat logical; one could argue 2..Bd6 justifies this. !? seems like a more objective label.
Your 5.Nxe5 is weak. I think 5.g5 must be played. If Black then plays the obvious 5...Ng4, we get this position:
Looks like White is playing the Black side of a Two Knights Defense, with the g pawn on g5 instead of g2!If play proceeds the same as it does in that opening, via 6.d4 exd4 7.Na4 Bb4+ 8.c3 dxc3 9.bxc3, I rather like White's position.

To me, an old timer, it is plain silly to play a move like 2. ...Bd6 which is bad on the surface and will probably lead to a lost game unless you are playing someone who is not a good player and if that be the case--you will still do better with a "normal move".
People who make up a new opening with a clearly bad move will not learn from their games with the bad move and this will hurt their progress.
Those who delude themselve that a bad move is "playable" need to learn the basics.

1. e4 e5 2.Nf3 Bd6 3.d4 exd4 4.Nxd4 Nc6 5.Nc3 Be5 6.Nf3 and black can choose between giving up bishop pair with 6...Bxc3 7.bxc3 and problems to develop kingside after 6...Bf6 7.Nd7
alexlaw wrote:
god it's ok. e4 e5 nf3 bd6 d4 exd4 nxd4 nc6 nc3 be5.
now ignoring the negative comment that will come for one person who's life is bent on criticizing me, what do the rest of you that don't like 2...bd6 think as a line?

strateg wrote:
Main line:1.e4 e5 2.Nf3 Bd6 3.d4 Nc6 4.dxe5 Bxe5 5.Nxe5 Nxe5 6.Nc3 d6 7.Be2 Nf6 8.0-0 0-0
Pacifique wrote:
3...Nc6 4.d5 and White has better position due to advantage in space + Black bishop on d6 looks ugly.

1. e4 e5 2.Nf3 Bd6 3.d4 exd4 4.Nxd4 Nc6 5.Nc3 Be5 6.Nf3 Bxc3 7.bxc3 Nf6 8.Bd3 0-0 9.0-0 d6 10.h3! Re8 11.Re1
5...Ne7 6.Ndb5