There's this article but there's only one game on it:
https://nezhmet.wordpress.com/category/chess-openings/qga/4bg4/
QGA Main Line 4. ... Bg4!?
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Dec 25, 2016
0
#4
Delchev has several chapters about it in "Understanding the Queen's Gambit Accepted" from chess stars.
Dec 25, 2016
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#5
@melvinbluestone
I was doing some research and it looks like the main line after 6. Qb3 Bxf3 7. gxf3 is 7. ... Nbd7 8. Qxb7 c5, where Black has sufficient compensation for the pawn.
Looks like 4...Bg4 is certainly playable but maybe not the easiest for Black.
Black usually gives up the center in the QGA for some freedom in his pieces. By trading off the freed B early doesn't necessarily help black unless he can get something out of the broken Kside pawns on f3 or an open file if exchanged on g6. But White usually keeps the center, can dominate on the light squares, and then has the 2 B's which often gives him the much easier game to play. Hopefully trading off one of his plusses for a better advantage later.
An interesting example is:
Zaitsev - Spassky 1960
In Spassky - Szabo 1964, Spassky prefers to keep the pawn structure but play for the center advantage and better position. Might not be totally winning but he did in that game.
In Korchnoi - Szabo 1964, White was able to weaken Black's Kside pawns and keep the 2 B's and center. Looked to get the winning position with better mobility and Black weaknesses.
A more modern example that shows White really playing for the 2 B's advantage and light square dominance is a 2014 game by Daniil Dubov:
Dec 27, 2016
0
#7
I quite like the 4...Bg4 line and have used it very occasionally. The main reasons why I don't make it my main repertoire are
1) They can avoid it with 3.e3 (assuming they've played (1.d4 d5 2.c4). You then have to either play 3...e5 or accept you've been move ordered out of it. Neither of which is a big deal but increases the amount you need to know.
2. I don't really like the positions after 3.e4. Again it's totally OK for Black with many playable options but never felt 100% happy with the positions.
Definitely worth a look though, the average player isn't going to be super well prepared against it.
Jan 9, 2017
0
#8
Thanks guys, I just played a tournament game with this line from the Black side:
I was wondering if anyone knew the theory or any resources for 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 Bg4!?. It looks interesting but all I can find is information on the more common 4. ... e6. Thanks