user2042: Recently I was trying to improve Scandinavian defense in a way that I can reach "Viking" setup ( ...0-0-0 + ...Nc6 + ...Bg4 vs d4 ). I am trying out various move orders, and have stumbled upon one that I believe would suit me the best:
[Title "Scandinavian defense, B01"]
[fen ""]

1.e4 d5 2.exd5 Qxd5 3.Nc3 Qa5 4.d4 Nf6 5.Nf3 Bg4

If White plays 6.Bc4 then I can reach my desired setup, which seems to give Black good play according to GM Eric Prié. Unfortunately, I can't afford subscription for the Chess Publishing and the article is dated.
My main interest is about positions with 6.h3! since they can become very hard for Black, forcing him to play "only" moves. In order for answers to this question not to be to broad I am asking for comprehensive resources on the line with 6.h3 only. If space allows, I would appreciate if the answerer could list resources for other moves as well ( like 6.Bc4 ).
To repeat, is there a thorough coverage of the following line:
[Title "Scandinavian defense, B01"]
[fen ""]

1.e4 d5 2.exd5 Qxd5 3.Nc3 Qa5 4.d4 Nf6 5.Nf3 Bg4 6.h3! 


user3381: I don't think there is a coverage for this line, but if you don't mind, I have been playing this line for years, so here's my thought.
In this position, black generally takes on f3. The reason is that the move Bg4 per se is aiming to trade off the knight at f3, if not, black will have no reason to play this move among others.
What if black doesn't exchange
a) Bh4 in this position is okay, but white can expand on the king side with h3 and g4. Black cannot really exploit the weakness white created in kingside, as Black piece placement commands black play on queenside.Furthermore, the knight on f3 usually will become a strong piece occupying the outpost e5 in the game later on, while black's light squared bishop is a bad bishop due to blacks pawn structure. This all gives white huge initiative in kingside. For instance
[fen "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"]

1.e4 d5 2.exd5 Qxd5 3.Nc3 Qa5 4.d4 Nf6 5.Nf3 Bg4 6.h3 Bh5 7.g4 Bg6 8.Ne5 e6 9.Bg2 c6 10.h4 Be4 11.Bxe4 Nxe4 12.Qf3 Nd6 

b) Bf4 or any retreating move is dubious, if black plays this, black may as well just play 5. Bf4 at first instead of wasting a tempo, as black has given white a tempo and white can follow up with g4 Ne5 etc. For instance
[FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"]

1.e4 d5 2.exd5 Qxd5 3.Nc3 Qa5 4.d4 Nf6 5.Nf3 Bg4 6.h3 Bf5 7.g4 Be4 8.Bd2 Bxf3 9.Qxf3 

What to do after exchange
a) What usually goes is like this
[FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"]

1.e4 d5 2.exd5 Qxd5 3.Nc3 Qa5 4.d4 Nf6 5.Nf3 Bg4 6.h3 Bxf3 7.Qxf3 c6 8.Bd2 Nbd7 9.Bc4 e6 10.O-O Be7 11.Rfe1 O-O 

Black ends up with a solid position
b) Black can also try undermine white's d-pawn if white is careless, due to the lack of f3 knight
[FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"]

1.e4 d5 2.exd5 Qxd5 3.Nc3 Qa5 4.d4 Nf6 5.Nf3 Bg4 6.h3 Bxf3 7.Qxf3 c6 8.Bd2 Nbd7 9.O-O-O O-O-O 10.Bc4 e6 11.Ne4 Qa4 12.Bb3 Qxd4 13.Nxf6 Qxf6 

c) In some line, black can also play a Bronstein-Larsen-like game.
[FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"]

1.e4 d5 2.exd5 Qxd5 3.Nc3 Qa5 4.d4 Nf6 5.Nf3 Bg4 6.h3 Bxf3 7.Qxf3 c6 8.Bd2 Nbd7 9.Bc4 e6 10.Ne4 Qb6 11.Nxf6+ gxf6

Conclusion
If you opt to play Bg4, then you should Bxf3, Bh5 is also playable. Ultimately, the position is something like Caro-Kann for black. Usually, black is behind in development in most lines due to the capture on f3, but the solid position of black compensates it.

2042: <p>Recently I was trying to improve Scandinavian defense in a way that I can reach "Viking" setup ( <code>...0-0-0 + ...Nc6 + ...Bg4</code> vs <code>d4</code> ). I am trying out various move orders, and have stumbled upon one that I believe would suit me the best:</p>

<pre><code>[Title "Scandinavian defense, B01"]
[fen ""]

1.e4 d5 2.exd5 Qxd5 3.Nc3 Qa5 4.d4 Nf6 5.Nf3 Bg4
</code></pre>

<p>If White plays <code>6.Bc4</code> then I can reach my desired setup, which seems to give Black good play according to GM <a href="http://www.chesspublishing.com/content/6/jan06.htm" rel="nofollow">Eric Prié</a>. Unfortunately, I can't afford subscription for the <em>Chess Publishing</em> and the article is dated.</p>

<p>My main interest is about positions with <code>6.h3!</code> since they can become very hard for Black, forcing him to play "only" moves. In order for answers to this question not to be to broad I am asking for comprehensive resources on the line with <code>6.h3</code> only. If space allows, I would appreciate if the answerer could list resources for other moves as well ( like <code>6.Bc4</code> ).</p>

<p>To repeat, is there a thorough coverage of the following line:</p>

<pre><code>[Title "Scandinavian defense, B01"]
[fen ""]

1.e4 d5 2.exd5 Qxd5 3.Nc3 Qa5 4.d4 Nf6 5.Nf3 Bg4 6.h3! 
</code></pre>
 3381: <p>I don't think there is a coverage for this line, but if you don't mind, I have been playing this line for years, so here's my thought.</p>

<p>In this position, black generally takes on f3. The reason is that the move Bg4 per se is aiming to trade off the knight at f3, if not, black will have no reason to play this move among others.</p>

<p><strong>What if black doesn't exchange</strong></p>

<p>a) Bh4 in this position is okay, but white can expand on the king side with h3 and g4. Black cannot really exploit the weakness white created in kingside, as Black piece placement commands black play on queenside.Furthermore, the knight on f3 usually will become a strong piece occupying the outpost e5 in the game later on, while black's light squared bishop is a bad bishop due to blacks pawn structure. This all gives white huge initiative in kingside. For instance</p>

<pre><code>[fen "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"]

1.e4 d5 2.exd5 Qxd5 3.Nc3 Qa5 4.d4 Nf6 5.Nf3 Bg4 6.h3 Bh5 7.g4 Bg6 8.Ne5 e6 9.Bg2 c6 10.h4 Be4 11.Bxe4 Nxe4 12.Qf3 Nd6 
</code></pre>

<p>b) Bf4 or any retreating move is dubious, if black plays this, black may as well just play 5. Bf4 at first instead of wasting a tempo, as black has given white a tempo and white can follow up with g4 Ne5 etc. For instance</p>

<pre><code>[FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"]

1.e4 d5 2.exd5 Qxd5 3.Nc3 Qa5 4.d4 Nf6 5.Nf3 Bg4 6.h3 Bf5 7.g4 Be4 8.Bd2 Bxf3 9.Qxf3 
</code></pre>

<p><strong>What to do after exchange</strong></p>

<p>a) What usually goes is like this</p>

<pre><code>[FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"]

1.e4 d5 2.exd5 Qxd5 3.Nc3 Qa5 4.d4 Nf6 5.Nf3 Bg4 6.h3 Bxf3 7.Qxf3 c6 8.Bd2 Nbd7 9.Bc4 e6 10.O-O Be7 11.Rfe1 O-O 
</code></pre>

<p>Black ends up with a solid position</p>

<p>b) Black can also try undermine white's d-pawn if white is careless, due to the lack of f3 knight</p>

<pre><code>[FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"]

1.e4 d5 2.exd5 Qxd5 3.Nc3 Qa5 4.d4 Nf6 5.Nf3 Bg4 6.h3 Bxf3 7.Qxf3 c6 8.Bd2 Nbd7 9.O-O-O O-O-O 10.Bc4 e6 11.Ne4 Qa4 12.Bb3 Qxd4 13.Nxf6 Qxf6 
</code></pre>

<p>c) In some line, black can also play a Bronstein-Larsen-like game.</p>

<pre><code>[FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"]

1.e4 d5 2.exd5 Qxd5 3.Nc3 Qa5 4.d4 Nf6 5.Nf3 Bg4 6.h3 Bxf3 7.Qxf3 c6 8.Bd2 Nbd7 9.Bc4 e6 10.Ne4 Qb6 11.Nxf6+ gxf6
</code></pre>

<p><strong>Conclusion</strong></p>

<p>If you opt to play Bg4, then you should Bxf3, Bh5 is also playable. Ultimately, the position is something like Caro-Kann for black. Usually, black is behind in development in most lines due to the capture on f3, but the solid position of black compensates it.</p>
