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Hot Topic (More than 10 Replies) Exchange Variation; Glenn Flear's ...Bb4 (Read 10566 times)
FreeRepublic
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Re: Exchange Variation; Glenn Flear's ...Bb4
Reply #18 - 12/10/22 at 21:14:14
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Just a note:  1. c4 e6 2. Nc3 d5 3. d4 Nf6 4. cxd5 exd5 5. Bg5 Bb4!? is covered on Chess Publishing, Nov 2022.
  
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FreeRepublic
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Re: Exchange Variation; Glenn Flear's ...Bb4
Reply #17 - 10/27/22 at 17:51:17
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I'd like to compare three lines that have some similarity:

A) Accelerated Ragozin
1. d4 d5 2. c4 e6 3. Nc3 Bb4
B) Flear/Tan variation
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. cd5 ed5 5. Bg5 Bb4
C) Ragozin/Vienna
1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. Nc3 Bb4 5. cxd5 ed5 6. Bg5

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A) Accelerated Ragozin: 1. d4 d5 2. c4 e6 3. Nc3 Bb4
White has a lot of flexibility here, including 4.cxd exd. However, one thing he cannot do is to pin the Black king knight.

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B) Flear/Tan variation: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. cd5 ed5 5. Bg5 Bb4
White pins the Black knight and has a choice of continuations.

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C) Ragozin/Vienna: 1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. Nc3 Bb4 5. cxd5 ed5 6. Bg5
This is the same as B, if White were to play 6.Nf3.

My rankings (for Black) would be C, then B, then A. However, the analysis provided by Flear and Tan suggests that line B is playable, with some complicated lines. Line A may be playable too but is my least preferred.
  
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FreeRepublic
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Re: Exchange Variation; Glenn Flear's ...Bb4
Reply #16 - 10/27/22 at 15:48:13
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FreeRepublic wrote on 10/17/22 at 21:32:37:
GM Justin Tan, ChessPublishing April 2022, covers the game Bok, B. (2624) Abdusattorov, Nodirbek (2661) which commenced:
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. cd5 ed5 5. Bg5 Bb4.


This is the line recommended by Glenn Flear in Dangerous Weapons, QGD. Continuing on a little:
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. cd5 ed5 5. Bg5 Bb4 6. e3 h6! 7. Bh4 g5! 8. Bg3 Ne4. (One branch - 9. Nd2!? Ng3 10. hg3)

This resembles a line in the Ragozin:
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 Bb4 5. cd5 ed5 6. Bg5 h6 7. Bh4 g5 8. Bg3 Ne4. (Richard Pert recommends 7...Nbd7, but ...g5 Bg3 and ...Ne4 usually follow.)

Sigma started this thread by wondering if this approach could be taken without the preliminary exchange cxd dxc:

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Bb4 5. e3 h6 6. Bh4 g5 7. Bg3 Ne4.

It's a good question. In fact Stockfish suggests 5. cxd5 exd5 which is a direct transposition to the analysis by Flear and Tan. However, I think White does better to play 5.e3. I think at some point Black will be hampered by the fact that his queen bishop cannot easily come into play.
  
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Re: Exchange Variation; Glenn Flear's ...Bb4
Reply #15 - 10/17/22 at 21:32:37
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I made some posts elsewhere, but should they should have been made here.

GM Justin Tan, ChessPublishing April 2022, covers the game Bok, B. (2624) Abdusattorov, Nodirbek (2661) which commences:
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. cd5 ed5 5. Bg5 Bb4.

Michael Roiz's includes this part 2, QGD Exchange variation, for Modern-Chess. (I would wait for a sale before purchasing).

Flear and Tan each provide plenty of analysis. All that remains is to go through it! I combined their analysis in one Chess Opening Wizard Ebook so that I can see where they deviate and add my own analysis.
  
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Re: Exchange Variation; Glenn Flear's ...Bb4
Reply #14 - 08/12/10 at 13:53:07
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I analysed this interesting  variation for quite a while and came to the conclusion that this is not so harmful for white if he responds correctly..I believe the best response to be e3! which takes the sting out of the ragozin type idea.I have also analyzed 3...Bb4(After Nc3) which is dubious due to 4.a3 transposing into favourble Saemisch type lines.

I have selected some important games to prove my point
  

Ragozin_Qgd.pgn ( 4 KB | 219 Downloads )

Fide elo-2602
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Re: Exchange Variation; Glenn Flear's ...Bb4
Reply #13 - 04/23/10 at 13:07:32
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Holy patronising attitude!

1) Yes, I'm aware that without Nf3 W can play Nge2 - a highly instructive observation. But with Bb4 W can't get his traditional Botvinnik set up v QGD - or maybe he can, but B has ...Bf5 options, so the game is different.

2) As you say, 5.e3 is a legal move. Well spotted! Anything wrong with it? No. You could also ask why does W shut his QB in with 4.e3 v. the NID. Surely B players should be aware of this possible transposition?

3) "The older classical lines with ..Be7 have been supplanted..." - notice the 's' at the end of the word line. It's plural - therefore have is correct. Then again, you are an American.

  
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Re: Exchange Variation; Glenn Flear's ...Bb4
Reply #12 - 04/22/10 at 18:16:22
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Tripler64 wrote on 04/22/10 at 10:33:35:
The difference with 3.Nc3 Nf6 4.cd ed 5.Bg5 Bb4 is that W hasn't played Nf3 - but I'm not sure if this makes a great difference.

Really?  Obviously White enjoys the option of putting his knight on e2, you know?  But if his knight was on f3, where is he going to put his e-pawn besides e3?

Tripler64 wrote on 04/22/10 at 10:33:35:
B should also be prepared for 5.e3 transposing into a Nimzo-Indian (E50-59) although B is okay there.


I'm at a loss to understand why anyone would play 5.e3, shutting in his QB.  It's a legal move, of course.  Did you mean 6.e3?  But that's a QG, not a Nimzo.

Tripler64 wrote on 04/22/10 at 10:33:35:
Flear may be right! The older classical lines with ...Be7 have been supplanted by the preference of SuperGMs for ...Bb4 lines. After 5.Bg5 Bb4 6.Qc2 is an acceptable line of the Nimzo-Indian (as someone pointed out.) It's playable.


There is one correct move, and that is 6.e3.  If someone must have a Qc2 Nimzo, there it is, but it's not best objectively. 

Have been supplanted?  Come now.
  

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Re: Exchange Variation; Glenn Flear's ...Bb4
Reply #11 - 04/22/10 at 10:33:35
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The difference with 3.Nc3 Nf6 4.cd ed 5.Bg5 Bb4 is that W hasn't played Nf3 - but I'm not sure if this makes a great difference. B should also be prepared for 5.e3 transposing into a Nimzo-Indian (E50-59) although B is okay there.
I've never trusted 4...Nd5 5.e4, I think W has an edge. Generally the Semi-Tarrasch is arrived at via 4.Nf3 Be7.
Flear may be right! The older classical lines with ...Be7 have been supplanted by the preference of SuperGMs for ...Bb4 lines. After 5.Bg5 Bb4 6.Qc2 is an acceptable line of the Nimzo-Indian (as someone pointed out.) It's playable.
  
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Re: Exchange Variation; Glenn Flear's ...Bb4
Reply #10 - 04/21/10 at 13:31:16
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Yes that's a big issue, and indeed so far as I know, 5.Nf3 is considered imprecise.
  

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Re: Exchange Variation; Glenn Flear's ...Bb4
Reply #9 - 04/20/10 at 19:51:53
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Reverse wrote on 04/20/10 at 19:33:39:
1 d4 d5 2 c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7

I have been playing this move order and then following with Bb4 if I want. It avoids the Qa4+ lines that force Nc6.


One issue there is that 5. e3 (not committing the knight to f3 yet) Bb4 is standardly considered better for White, as far as I know.
  
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Re: Exchange Variation; Glenn Flear's ...Bb4
Reply #8 - 04/20/10 at 19:33:39
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1 d4 d5 2 c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7

I have been playing this move order and then following with Bb4 if I want. It avoids the Qa4+ lines that force Nc6.
  
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Re: Exchange Variation; Glenn Flear's ...Bb4
Reply #7 - 06/18/09 at 16:16:09
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@Markovich something strange with your move numbering there, I suppose?

Regarding White's 6th move alternatives after 4.cxd5 exd5 5.Bg5 Bb4:
6.Qc2 is a direct transposition to a sharp main line of the 4.Qc2 Nimzo-Indian.
6.e3 is also one of Flear's main lines where he recommeds the sharp 6...h6 7.Bh4 g5 8.Bg3 Ne4.
6.Qa4+ gets a brief mention, referencing Djuric-Efimov, Cutro 2002.

And yes, even if Flear's line is playable 4.Bg5 seems to be a big problem for a Ragozin/Bb4 repertoire. But I'm only now discovering this, and it's a bit disappointing...

@RubenKuijper Why are you so certain that 4.cxd5 is the more accurate Exhange move order? I'm currently finding 4.Bg5 much more annoying from the Black side, as explained above!
  

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Re: Exchange Variation; Glenn Flear's ...Bb4
Reply #6 - 06/18/09 at 15:09:53
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It's hard for me to believe that 3.cxd5 exd5 4.Bg5 Bb4 is much good.  I would think that either 5.Qc2 or 5.e3 or even 5.Qa4+ would be quite fine for White.  But in any case, I'd be curious to know what Flear says about it. 

But in any case, how can the Ragozin be a complete response to 1.d4, given that 3.Bg5 is there?  A move after which, obviously, White is under no obligation to play 4.cxd4.
  

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Re: Exchange Variation; Glenn Flear's ...Bb4
Reply #5 - 06/18/09 at 15:07:22
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Viking wrote on 06/18/09 at 09:01:02:
Interesting.


What if black plays Be7 and captures ala the semi tarrasch?
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. cxd5 Nxd5!?

A likely continuation may be 6. Bxe7 Qxe7 7. e4 Nxc3 8. bxc3 c5 9. Nf3
cxd4 10. cxd4 O-O 11. Qd2 Nc6 12. Bc4

I you compare this position with Polugaevsky - Tal (which is consdered a critical game for the semi tarrasch) black is ahead:
1. c4 Nf6 2. Nc3 e6 3. Nf3 d5 4. d4 c5 5. cxd5 Nxd5 6. e4 Nxc3 7. bxc3 cxd4 8. cxd4 Bb4+ 9. Bd2 Bxd2+ 10. Qxd2 O-O 11. Bc4 Nc6 12. O-O

Whether this really matters I am not sure.

The white position seams easier to play after 5...Nxd5 anyway.

Yes, and 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.cxd5 seems to be the critical move-order. Altough black can try to get this position 1.d4 d5 2.c4 e6 3.Nc3 Be7
  

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Re: Exchange Variation; Glenn Flear's ...Bb4
Reply #4 - 06/18/09 at 13:50:04
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White does seem to score pretty well even after 4.Bg5 Be7 5.cxd5 Nxd5, though many of the Black players were lower-rated. I looked at some games recently that suggested White's road to an advantage is not as clear as many have thought even in the regular Semi-Tarrasch.

But 4...Be7 is really not a clever move from a Ragozin (Bb4) player, considering that White could switch plans and play 5.Nf3!
This way White has avoided the Ragozin, Vienna, Cambridge Springs and Semi-Slav by "threatening" to play the Exchange.
  

Improvement begins at the edge of your comfort zone. -Jonathan Rowson
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