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Normal Topic QGA 3.Nf3 Nf6 4.e3 Bg4 (Read 6690 times)
exigentsky
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Re: QGA 3.Nf3 Nf6 4.e3 Bg4
Reply #8 - 07/14/17 at 05:22:24
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Right, and in fact, some of Avrukh's critical lines even in the e4 variations still lead to no advantage:

1.d4 d5 2.c4 e6 3.Nf3 dxc4 4.e4 b5 5.a4 c6 6.axb5 cxb5 7.b3 Nf6 8.bxc4 Nxe4 9.c5 Bxc5 10.Bxb5+ Bd7 11.Bxd7+ Qxd7 12.dxc5 Qxd1+ 13.Kxd1 Nxf2+ 14.Ke2 Nxh1 15.Bf4 O-O 16.Bd6 Rc8 17.Nc3 Nd7 18.Na4 Nf6 19.Nd2 Ne8 20.Bf4 Nc7
  
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Stigma
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Re: QGA 3.Nf3 Nf6 4.e3 Bg4
Reply #7 - 01/22/17 at 13:38:53
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Right, in the original book. Avrukh switched to 3.e4 in the new edition of the series.

3.e3 is looking like an attractive solution to the QGA, which I have always been a bit worried about (it's not a bad defence at all, yet rare enough that when someone finally plays it, I struggle to remember my lines).

The ...a6/...b5 system is still in the mix though, since Black can try to reach that setup or something very similar by means of 3.e3 b5!? 4.a4 b4, then developing and playing for the ...c5 break.
  

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Re: QGA 3.Nf3 Nf6 4.e3 Bg4
Reply #6 - 01/22/17 at 05:02:59
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Yes, that's why Avrukh used 3.e3 in GM Rep 1.
  
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Re: QGA 3.Nf3 Nf6 4.e3 Bg4
Reply #5 - 01/21/17 at 09:00:09
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Correct me if I'm wrong, but does this line (as a main repertoire choice) depend on 3.e3 e5 being at least OK for Black? If it isn't, White could just change the move order and avoid it with 3.e3 and if 3...Nf6 4.Bxc4, when 4...Bg4 isn't possible.


Max Illingworth recently concluded on the main site that White does get an edge after 3.e3 e5:
http://www.chesspublishing.com/content/7/nov16.htm#qga

The ...Bg4 line would still have value when White has played an early Nf3 move order, of course (i.e. 1.Nf3 d5 2.d4 or 1.d4 Nf6 2.Nf3 d5 3.c4).
  

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Re: QGA 3.Nf3 Nf6 4.e3 Bg4
Reply #4 - 01/21/17 at 06:35:36
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I have played Delchevs recommendation 7..Nc6 a few times.  I find white generally is at a bit of a loss, and it relatively easy for black to build a kingside attack if white is not careful.

Delchev gives the7.. a6 move a ? mark as it gives white too much time to chace the g4 bishop around.


  
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Re: QGA 3.Nf3 Nf6 4.e3 Bg4
Reply #3 - 12/30/16 at 10:02:19
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Delchev in his recent book proposes to play 7...Nc6 as a way to stop White's central expansion. It's really an interesting and dynamic way to meet the main line. I have analyzed it  with Stockfish and haven't found any clear hole. My results in online blitz with this line have been very good. Also this line appeared only rarely in my games. I got 3.e3 - 3.e4 and 3.Nc3 in descending order of frequency as more frequent answers before 3.Nf3. I don't understand why Nc3 is played so much but these are my statistics in my blitz games.
 



huibui wrote on 05/15/11 at 10:29:21:
Hi!

I spent some time analysing an interesting sideline in the QGA: 3.Nf3 Nf6 4.e3 Bg4. Avrukh avoids it by suggesting 3.e3, and iirc he mentions that he didn't find a white advantage after some improvements by Arthur Kogan.

However, I didn't manage to find a good solution for Black against the main line:

1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 Bg4 5.Bxc4 e6 6.h3 Bh5 7.Nc3 a6 (7...Nbd7 leads to a worse ending after 8.0-0 Bd6 9.e4 e5 10.g4 Bg6 11.dxe5 Nxe5 12.Nxe5 Bxe5 13.f4 Qd4+ 14.Qxd4 Bxd4+ 15.Kh2 Bxc3 16.bxc3 Bxe4 17.g5 +=) 8.g4 Bg6 9.Ne5 Nbd7
[9...c5 might be an interesting idea, but the positions after 10.Qf3 Qb6 11.Nxg6 hxg6 12.d5 Nbd7 13.dxe6 fxe6 seem to be very unclear, and I think White should be better;
9...Nfd7 10.Nxg6 hxg6 11.Bf1 and White seems to be better]
10.Nxg6 hxg6 11.Qf3
[11.g5 is not dangerous: Nd5 12.Nxd5 exd5 13.Bxd5 c6 14.Bc4 Nb6 =;
11.Bf1 is probably to slow: c6 12.Bg2 Qc7, followed by ...Bd6, ...Rad8 and ...e5]
11...c6 [11...Rb8 might be an alternative, although 12.Bd2 (12.g5!?) c5 isn't very clear after, let's say, 13.Bb3] 12.Bd2 (12.Bb3 Nd5) Nd5N This has not been played before, but I don't really like the alternatives, like 12...Be7 or 12...Bb4.

After analysing this position with Houdini for a while, I'm under the impression that Black should be able to equalize, however I'm not sure if that is true. White has the two bishops after all, maybe I just didn't find the correct plan to make use of them.

Do you think Black is OK in the final position? Do you know of any improvements for Black before that (for instance after 9...c5)?

  
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Re: QGA 3.Nf3 Nf6 4.e3 Bg4
Reply #2 - 05/15/11 at 17:45:43
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Pantu wrote on 05/15/11 at 12:09:36:
Did you check what Kogan actually plays?


No Embarrassed

Now I did and found two games where he played against this line (6.h3 + 7.Sc3). Both times he chose 7...Nd7, and  8...Bb4 in the game where White castled (Malakhov-Kogan, 2007).

I will look into this line a bit, though at first glance it doesn't seem to solve Black's problems...
  

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Re: QGA 3.Nf3 Nf6 4.e3 Bg4
Reply #1 - 05/15/11 at 12:09:36
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Did you check what Kogan actually plays? As far as I can tell, he favours 7...Nbd7 8 0-0 Bb4! (8...Bd6 seems to be bad).  Actually here I think 9 Be2 0-0 10 Qb3 gives white reasonable chances for an edge.
  
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QGA 3.Nf3 Nf6 4.e3 Bg4
05/15/11 at 10:29:21
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Hi!

I spent some time analysing an interesting sideline in the QGA: 3.Nf3 Nf6 4.e3 Bg4. Avrukh avoids it by suggesting 3.e3, and iirc he mentions that he didn't find a white advantage after some improvements by Arthur Kogan.

However, I didn't manage to find a good solution for Black against the main line:

1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 Bg4 5.Bxc4 e6 6.h3 Bh5 7.Nc3 a6 (7...Nbd7 leads to a worse ending after 8.0-0 Bd6 9.e4 e5 10.g4 Bg6 11.dxe5 Nxe5 12.Nxe5 Bxe5 13.f4 Qd4+ 14.Qxd4 Bxd4+ 15.Kh2 Bxc3 16.bxc3 Bxe4 17.g5 +=) 8.g4 Bg6 9.Ne5 Nbd7
[9...c5 might be an interesting idea, but the positions after 10.Qf3 Qb6 11.Nxg6 hxg6 12.d5 Nbd7 13.dxe6 fxe6 seem to be very unclear, and I think White should be better;
9...Nfd7 10.Nxg6 hxg6 11.Bf1 and White seems to be better]
10.Nxg6 hxg6 11.Qf3
[11.g5 is not dangerous: Nd5 12.Nxd5 exd5 13.Bxd5 c6 14.Bc4 Nb6 =;
11.Bf1 is probably to slow: c6 12.Bg2 Qc7, followed by ...Bd6, ...Rad8 and ...e5]
11...c6 [11...Rb8 might be an alternative, although 12.Bd2 (12.g5!?) c5 isn't very clear after, let's say, 13.Bb3] 12.Bd2 (12.Bb3 Nd5) Nd5N This has not been played before, but I don't really like the alternatives, like 12...Be7 or 12...Bb4.

After analysing this position with Houdini for a while, I'm under the impression that Black should be able to equalize, however I'm not sure if that is true. White has the two bishops after all, maybe I just didn't find the correct plan to make use of them.

Do you think Black is OK in the final position? Do you know of any improvements for Black before that (for instance after 9...c5)?
  

You tell the young people of today that...
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