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Very Hot Topic (More than 25 Replies) Coverage of the Blumenfeld (Read 39165 times)
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Re: Coverage of the Blumenfeld
Reply #52 - 12/26/18 at 23:09:04
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Re: Coverage of the Blumenfeld
Reply #51 - 07/15/18 at 03:56:32
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MNb wrote on 07/14/18 at 04:43:57:
7...bxc4 8.Bxc4 Ba6 looks like a better try to me. Of course it requires careful study - all daring defenses do.


1.d4 Nf6 2.Nf3 e6 3.c4 c5 4.d5 b5 5.e4 Nxe4 6.Bd3 Nf6 7.O-O bxc4 8.Bxc4 Ba6 9.Bxa6 Nxa6 10.Nc3 Qc8 is following Sokolov-Kvon, Elsinore 2017 (0-1 in 65 moves). 11.Bg5 Be7 12.Rc1 0-0 13.d6 Bd8 Here, Sokolov played 14.Qe2. Stockfish prefers 14.Ne5. The position is nominally equal, according to the engine, though it's hard not to think White probably has very good compensation for the pawn. At the same time, it's difficult to push that compensation into any concrete advantage.

Alternatively, 12.dxe6 fxe6 13.Ne5 looks interesting. Beradze-Paravyan, Batumi 2017, (0-1 in 32) went 13...0-0 14.Nxd7 Rd8 15.Nxf6+ gxf6 16.Bd2 Nb4 17.Qg4+ Kh8 18.Rad1. Stockfish prefers 13...Qb7 14.Re1 0-0 15.Bxf6 Bxf6 16.Qxd7. Black's not in dire straits, but the engine likes the position for Black a good deal more than I like its optics.

But I suspect you're right: 7...bxc4 looks like it provides stern resistance. Back to 5.Bg5...
  

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Re: Coverage of the Blumenfeld
Reply #50 - 07/14/18 at 19:49:02
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From the contents of the Martin DVD:

06: 5.e4 Nxe4 6.Bd3/dxe6 Game 5 - Cramling,P - Muzychuk,A [08:12]
  
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Re: Coverage of the Blumenfeld
Reply #49 - 07/14/18 at 19:23:11
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bragesjo wrote on 07/14/18 at 11:29:00:
Threre is also a chessbase dvd by Andrew Martin about  Blumenfeld


And there's a fairly recent 6-hour one from The Chess World, by IM Bill Paschall. It might be more up-to-date and comprehensive than Martin's, but I haven't seen either.

I would be interested to know if either of these DVDs cover this recent trend with the dangerous 5.e4, just mentioned by HgMan. If anyone knows.
  

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bragesjo
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Re: Coverage of the Blumenfeld
Reply #48 - 07/14/18 at 11:29:00
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Threre is also a chessbase dvd by Andrew Martin about  Blumenfeld
  
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Re: Coverage of the Blumenfeld
Reply #47 - 07/14/18 at 04:43:57
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7...bxc4 8.Bxc4 Ba6 looks like a better try to me. Of course it requires careful study - all daring defenses do.
  

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Re: Coverage of the Blumenfeld
Reply #46 - 07/14/18 at 03:00:38
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Digging around a bit in the Blumenfeld this evening: It seems as though 5.e4 is generating further attention than 5.Bg5, which captured our imagination some time ago. The game Svane-Zeller, Bundesliga 2014 serves as model in the chesspublishing e-book and starts like this:

1.d4 Nf6 2.Nf3 e6 3.c4 c5 4.d5 b5 5.e4 Nxe4 6.Bd3 Nf6 7.O-O!? Be7 8.Nc3 a6

A blogpost this week claimed that this line has refuted the Blumenfeld, though some hyperbole is in the air. But things do look a bit sticky, and I would imagine it's likely that White might be able to improve on Svane's play. It's interesting to note, too, that 7.0-0 doesn't feature in most Blumenfeld guides (Aveskulov, Przewoznik, etc.).

Is this another line that requires some careful study? What is the current state of play?
  

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Re: Coverage of the Blumenfeld
Reply #45 - 02/21/10 at 12:14:39
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I'm trying to learn the basics of the Blumenfeld myself now and using the following sources:

- Two videos in the "Alterman's Gambit Guide" series on www.chess.fm.

- SOS (Secrets of Opening Surprises) Vol. 11 article by Rogozenko on the accepted wirh 6...a6!?.

- Article by Chris Ward in "Dangerous Weapons. The Benoni and Benko" outlining his own black repertoire in the Blumenfeld accepted.

I also have the aforementioned Przewoznik book for reference. Actually there are two versions of it; one English-language by "Przewoznik and Pein" and one German-language by "Przewoznik and Konikowski", both from ca. 1991! I have the german version, but I have no idea how much difference there is between them (if any).

So far my impression is that Black has a wide choice of move orders in the accepted, and should be able to find something playable against each of White's lines there. Really critical is 6...d5 7.Nc3! and now Ward's 7...Bb7 8.e4 d4 9.e5 Nfd7 looks like the best try. Black is willing to sacrifice another pawn, allowing Bc4xe6+, for a lead in development and open lines for attack. If that ultimately fails I will look more closesly at Rogozenko's 6...a6 7.bxa6 Be7!?, though here 7...d5 8.Nc3 is also supposed to be less effective for White: 8...d4 9.Na4 Rxa6 10.Bd2 (10.b3 c4) 10...Ne4 11.e3 Nxd2 12.Nxd2 dxe3 "and White must give back the extra pawn, fighting for equality" -Rogozenko (13.fxe3 Qh4+ 14.g3 Qxa4).

Against 4.Bg5 there are a couple of White repertoire books that are useful to check: Palliser's "Play 1.d4!" and Grivas' "Beating the Fianchetto Defences" both recommend it. There's also an article in SOS-10 that I haven't seen; EDIT turns out this is about 5.Bg5 b4 which means I should get it ASAP! So far I'm looking at 5.Bg5 exd5 6.cxd5 d6 and 5.Bg5 b4!? and trying to make one of them work.

The "Dangerous Weapons" book also has a chapter on the related "Pseudo-Blumenfeld Gambit" 1.d4 Nf6 2.Nf3 c5 3.d5 e6 4.Nc3 b5!?, written by Richard Palliser.
« Last Edit: 02/21/10 at 13:28:21 by Stigma »  

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Re: Coverage of the Blumenfeld
Reply #44 - 02/20/10 at 22:31:52
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I'd like to study the Blumenfeld. (as an alternative to the Bogo-Indian)
Please recommend books/CDs/CBFTs/etc.
  

as
*W 1d4) Torre/Barry/Pirc/Philidor/ early _d5:early c4(QGD/Slav/QGD/etc)
*B) 1e4:e6 [+1_c5 2Nf3 a6]| 1d4:e6 2c4 Bb4+ BID/pseudoNID [+1_Nf6 NID]| 1c4:c5,_Nc6,_e5,_g6| 1Nf3:c5
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Re: Coverage of the Blumenfeld
Reply #43 - 09/23/08 at 01:03:03
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To the best of my knowledge, the above analysis holds; this is consistent with the recent games I've seen which are more of a hybrid flavor (with d5 delayed in favor of a6, for example).

I haven't been staying up-to-date, however, so now that I have a bit more time, I'll have to look over the recent updates here.
  
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Re: Coverage of the Blumenfeld
Reply #42 - 08/30/08 at 23:38:16
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I was reminded of these discussions when I saw the latest Daring Defences update.  What is the status of the Blumenfeld?
  

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Re: Coverage of the Blumenfeld
Reply #41 - 06/20/06 at 05:18:20
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HgMan wrote on 06/10/06 at 12:59:11:
But Przewoznik's analysis of 6 ... Bb7 looks interesting, and might be a useful way to sidestep some of the problems after the line you mentioned.  I need to look at this move more carefully, but 6 ... Bb7 7 Nc3 Be7, withholding d7-d5 might be okay...


MNb wrote on 06/11/06 at 01:50:38:
I do not like withholding d7-d5. The bishop is on e7 less active than on d6.


It looks like that the 'modern alternative' 6...Bb7 might well be preferable to 6...d5, although not for any of the reasons found in books.

I also prefer to play d5 immediately, although maybe Black can delay Bd6.

I am trying to determine if, instead, Black can afford to play 6...d5 7.Nc3 Be7 with the idea of meeting 8.e4 or even 8.g3 with d4.  NCO's suggestion of 8.e4 d4 9.e5 dxc3 10.exf6 (following Burgess-Hansen 1992) does not seem very threatening to black's cause, but White has better.

What do you think?  Is it worth trying to save 6...d5 or is the more restrained approach a better bet?  Anytime White achieves e4, I have to doubt Black's compensation, though this may be too pessimistic.
  
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Re: Coverage of the Blumenfeld
Reply #40 - 06/11/06 at 01:50:38
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As I have not found anything decent after 10.Ng5 (instead of 10.Ne4?) it looks like I have been lucky. Indeed anything other than 7...Nbd7 fails to the plan e2-e4.
I do not like withholding d7-d5. The bishop is on e7 less active than on d6.
  

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Re: Coverage of the Blumenfeld
Reply #39 - 06/10/06 at 12:59:11
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I always thought that Black was okay if White accepted the gambit pawn, but checking the database on the line you mentioned came as a surprise!  Shocked  I don't know why we were even bothering to discuss 5 Bg5!  The numbers look devastating, and Przewoznik doesn't offer much help after 6 ... d5 7 Nc3.  Each line looks depressing, though I, too, want to go back to MNb's game.

But Przewoznik's analysis of 6 ... Bb7 looks interesting, and might be a useful way to sidestep some of the problems after the line you mentioned.  I need to look at this move more carefully, but 6 ... Bb7 7 Nc3 Be7, withholding d7-d5 might be okay...
  

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Re: Coverage of the Blumenfeld
Reply #38 - 06/10/06 at 04:26:25
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Scholar wrote on 06/02/06 at 08:01:36:
5.dxe6 fxe6 6.cxb5 d5 7.Nc3 Nbd7 8.e4 d4 9.e5 Ng4 instead of 10.Ne4? Bb7! it looks like White has a number of moves which need to be checked more carefully.  This looks to be a weak point of the entire Blumenfeld as far as I can see, mainly because Black seems to lack good alternatives at move 7, and his earlier deviations do not appeal to me as much (postponing d5 or playing an early a6).

I would like to rule out White's alternatives at move 9 and 10, but things are not yet clear.  For example, the sequence 10.Ng5 Ndxe5 11.f4 dxc3 12.Qxd8+ Kxd8 13.fxe5 seems to be virtually forced from Black's perspective, and at the end, he is left in a difficult position where his pawns are weak and obstruct his pieces.


I'm still a bit unsure how I will meet the accepted lines, especially 7.Nc3 where White is really threatening to blow Black off the board after e4.  Perhaps it is all explained in the annotations to MNb's game...but I can't see how Black can save the 7...Nbd7 line.  Dare I ask what others have chosen here?  7...Be7 hoping to survive even after x...d4?

Is there another way out here that I've overlooked?
  
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Re: Coverage of the Blumenfeld
Reply #37 - 06/10/06 at 04:11:53
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I'm not a fan of Black's structure after 7...d6 8.Bxf6 gxf6.  If White plays simple chess, starting with 9.e3, I don't think that Black can mobilize quickly enough to take advantage of the queenside space or half-open g-file before White consolidates.  The variations may prove me wrong, but if White can play a4 and post a knight on f4, he will sit very nicely.
  
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Re: Coverage of the Blumenfeld
Reply #36 - 06/09/06 at 20:50:55
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HgMan wrote on 06/01/06 at 21:57:46:
I think MNb's line might be the best way out of the thicket.  I just posted on the Nimzo thread on 1 d4 Nf6 2 c4 e6 3 Nf3 c5 4 d5 b5 5 Bg5 exd5 6 cxd5 h6 7 Bxf6 Qxf6 8 Qc2! (maybe it doesn't deserve a "!" but I think it's markedly stronger than 7 Nc3).  So:

1 d4 Nf6 2 c4 e6 3 Nf3 c5 4 d5 b5 5 Bg5 exd5 6 cxd5 Qa5+ 7 Nc3

I'm not sure that 6 ... Qa5+ 7 Nc3 resolves any of Black's queenside problems.  I like 7 ... Be7 8 d6 Bd8, which turns out okay if Black can find some way to activate his/her queenside pieces.  But look at 7 ... Be7 8 Qd2! 0-0 9 d6 Bd8 10 Bxf6 Bxf6 11 Nd5 Qxd2+ 12 Nxd2; Black is really hurting!

Instead: 6 ... Qa5+ 7 Nc3 d6 (which Black has to play at some point anyway...) 8 Bxf6 gxf6 9 Qd3 c4 10 Qe4+ Be7 and Black might even have a reasonable game on the queenside, so long as the fractured pawn structure on the kingside doesn't become too serious a liability.  I suppose an alternative to 9 ... c4 is 9 ... Bd7, but I'm not sure I want to pin down my pieces to passive defense.  Having said that, I'm worried about 11 Nd4 when the f5 square looks vulnerable.  11 Nd4 b4 12 Nd1 f5 13 Nxf5 Bxf5 14 Qxf5 Nd7 15 e3 c3 16 bxc3 bxc3.  Black may have some compensation for the pawn, but I'm not sure I would like to play Black here...


I still like 7 ... d6 here.  Does anyone see any problems for Black?
  

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Re: Coverage of the Blumenfeld
Reply #35 - 06/05/06 at 20:10:44
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22 Bc4 looks a little more persuasive than 22 Rd1 (bishops before rooks!  Wink).  22 ... Qf4 23 Bd5 Rc8 24 g3 and 0-0 to follow.  I like that White's position comes together with tempo in each case.

That said, 20 ... Nc6 looks better than my 20 ... Qe8...
  

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Re: Coverage of the Blumenfeld
Reply #34 - 06/05/06 at 05:16:30
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HgMan wrote on 06/03/06 at 22:38:46:
That may be playable, but I was worried about:

18 Qxg7 Qf8 19 Qg5+ Ke8 20 Qe5+ Kd8 21 d6! Qe8 22 Qg5+ f6 23 Qxf6+ Kc8 24 f3

White still needs to find a home for his/her bishop and activate those rooks, but I'm not crazy about Black's pawn on c5...



Who needs the pawn on c5, after 19.Qe5+ Kd8 (reaching your line a move faster) 20.d6 Nc6 21.Qxc5 Qh6 22.Rd1 Qe6 and Black can start hunting some pawns...

I'm not sure I understand 21....Qe8 which gives White the f-pawn with check...
« Last Edit: 06/05/06 at 21:05:22 by Scholar »  
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Re: Coverage of the Blumenfeld
Reply #33 - 06/03/06 at 22:38:46
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That may be playable, but I was worried about:

18 Qxg7 Qf8 19 Qg5+ Ke8 20 Qe5+ Kd8 21 d6! Qe8 22 Qg5+ f6 23 Qxf6+ Kc8 24 f3

White still needs to find a home for his/her bishop and activate those rooks, but I'm not crazy about Black's pawn on c5...

  

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Re: Coverage of the Blumenfeld
Reply #32 - 06/03/06 at 21:30:03
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This piece sac certainly dangerous, but after 18...Qf8 Black still is in the game. Or am I missing something?
  

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Re: Coverage of the Blumenfeld
Reply #31 - 06/03/06 at 16:43:06
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I think this is the critical line after 7 ... Ne4:

1.d4 Nf6 2.Nf3 c5 3.d5 e6 4.c4 exd5 5.cxd5 b5 6.Bg5 Qa5+ 7.Nc3 Ne4 8.Bd2 Nxd2 9.Nxd2 d6 10.e4 b4 11.Nc4 Qd8 12.Qa4+! Bd7 13.Nb5 a6 14.Nbxd6+ Bxd6 15.Nxd6+ Ke7 16.Qb3 Kxd6 17.Qg3+ Ke7 18.Qxg7

This is a big improvement on Browne-Ljubojevic, and seems to leave Black in a lot of trouble.
  

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Re: Coverage of the Blumenfeld
Reply #30 - 06/03/06 at 14:51:09
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Scholar wrote on 06/02/06 at 08:01:36:
@Browne,W (2540) - Ljubojevic,L (2590), Konex Buenos Aires (6), 1979

1.d4 Nf6 2.Nf3 c5 3.d5 e6 4.c4 exd5 5.cxd5 b5 6.Bg5 Qa5+ 7.Nc3 Ne4 8.Bd2 Nxd2 9.Nxd2 d6 10.e4 b4 11.Nc4 Qd8 12.Nb1 Be7 13.Bd3 0-0 14.0-0 Bf6 15.Nbd2 Nd7 16.Nxd6 Bxb2 17.Rb1 Bc3 18.Nxc8 Rxc8 19.Nc4 ½-½

I'll avoid talking about the main line here and instead mention a couple of earlier deviations I found interesting:

I think that White might try 12.Ne2 intending Ng3.  Comparing this to the similar line in the Benoni, Black will have a more difficult time generating play on the queenside, but is free of his king's knight which usually just gets in the way.  It's difficult to assess without any practical examples, but I worry that White has too much control over opening both the queenside and center to give Black a comfortable equality.  The other knight move, 12.Nb5 seems to force a draw.

The move 8.Qd3 is also rather forcing -- Black seems to be holding on in the lines I've looked at, but White has some ideas which have not been tested.  Ultimately, I think Black will be OK here, even in positions where a sacrifice of some material is required, but I'll have to check more deeply before being able to play against this with confidence.


Can White really play on after 12.Nb5?  It seemed like he would have a rather difficult time continuing the attack after say 12.Nb6 a6 13.Qa5 Bd7 14.Nxd6+ Bxd6 15.Nxd6+ Ke7 16.Qb3 Kxd6 17.Qg3+ Ke7 18.Qxg7+ Qf8 19.Qe5+ Kd8 and while Qf6+ gets a perpetual, it's hard to find concrete moves.  I agree that this is dangerous though.

The 8.Qd3 lines don't look as threatening...I was seeing some ghosts last time.

12.Ne2 might be the best alternative, though I'll have to look at 11.Bb5+.
  
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Re: Coverage of the Blumenfeld
Reply #29 - 06/03/06 at 13:20:14
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MNb wrote on 06/02/06 at 03:36:12:
HgMan wrote on 06/01/06 at 22:14:11:
I presume, of course, that 7 ... Ne4 must be the mainline, but Black does not seem to score particularly well here.  8 Bd2 Nxd2 9 Nxd2 d6 10 e4 seems to take all the fun out of the position for Black...


Already checked Browne-Ljubojevic, Buenos Aires 1979?


Is this really Black's best?  I like 10 ... b4, although I'm really not fond of the idea that White's knight can jump to c4 with tempo.  At first, I thought that White was better if it avoided the pawn exchange, d6 for b2, with something like 15 Qc2 and working to limit Black's counterplay; Black's pieces look awkward and are hard-pressed to find good squares.

Gavrilov interposed 11 Bb5+ Bd7 12 Nc4 Qd8 13 Bxd7+ Nxd7 14 Nb1 in Gavrilov-Tsarev, Moscow 1988, which reached a similar position to Browne-Ljubojevic, but without the light-squared bishops, which is probably a little better for White.

But then I went looking for an alternative to 12 Nb1 in Browne-Ljubojevic, and it turns out that White has a rather promising piece sacrifice: 12 Qa4+!  Now: 12 ... Bd7 13 Nb5 a6 14 Nbxd6+ Bxd6 15 Nxd6+ Ke7 16 Qb3 Kxd6 17 Qg3+ Ke7 18 Qxg7, and White should pick up three pawns for the piece.  I like White here.  White's queen was a little passive in Browne-Ljubojevic, but 12 Qa4+ brings her into the fray to good effect.

I still think I prefer 7 ... d6 from my earlier post...
  

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Re: Coverage of the Blumenfeld
Reply #28 - 06/02/06 at 14:54:56
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Thanks for the reply Scholar; I admit I was premature to say that the position looked "equal" to me, perhaps "playable" was more on the mark.  Still, I think Black has accomplished something by not letting the White knight into c4; I'll look a little closer at the position and see what I think.  For now, I'll stand by my comments that 10...Nc7! is better than 10...Rb8, though.
  
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Re: Coverage of the Blumenfeld
Reply #27 - 06/02/06 at 08:01:36
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@ErictheRed: Regarding the line you propose, 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 b5 5.Bg5 Qa5 6.Qd2 Qxd2+ 7.Nfxd2!  bxc4 8.Bxf6 gxf6 9.e4 Na6 10.a3 Nc7 11.Nc3 Bb7 12.Bxc4, I think that White retains the better chances by playing 0-0-0, g3, f4 and intending to break through in the center.  Black has a hard time finding good squares for his pieces and the rooks are drawn to the b and g files where they do nothing at all.  Still this is a very reasonable idea, and maybe if Black plays actively in the center he can hold on, but I think it is too early to call the position equal.

@Browne,W (2540) - Ljubojevic,L (2590), Konex Buenos Aires (6), 1979

1.d4 Nf6 2.Nf3 c5 3.d5 e6 4.c4 exd5 5.cxd5 b5 6.Bg5 Qa5+ 7.Nc3 Ne4 8.Bd2 Nxd2 9.Nxd2 d6 10.e4 b4 11.Nc4 Qd8 12.Nb1 Be7 13.Bd3 0-0 14.0-0 Bf6 15.Nbd2 Nd7 16.Nxd6 Bxb2 17.Rb1 Bc3 18.Nxc8 Rxc8 19.Nc4 ½-½

I'll avoid talking about the main line here and instead mention a couple of earlier deviations I found interesting:

I think that White might try 12.Ne2 intending Ng3.  Comparing this to the similar line in the Benoni, Black will have a more difficult time generating play on the queenside, but is free of his king's knight which usually just gets in the way.  It's difficult to assess without any practical examples, but I worry that White has too much control over opening both the queenside and center to give Black a comfortable equality.  The other knight move, 12.Nb5 seems to force a draw.

The move 8.Qd3 is also rather forcing -- Black seems to be holding on in the lines I've looked at, but White has some ideas which have not been tested.  Ultimately, I think Black will be OK here, even in positions where a sacrifice of some material is required, but I'll have to check more deeply before being able to play against this with confidence.

Regarding 5th move alternatives, I am happy with 5.Bg5 h6 at the moment, but really I think many of Black's replies give him an acceptable game.  In fact, the more that I look, the more that I feel that the accepted lines are White's best chance for an advantage, but so far, I am satisfied with Black's compensation.

5.dxe6 fxe6 6.cxb5 d5 7.Nc3 Nbd7 8.e4 d4 9.e5 Ng4 instead of 10.Ne4? Bb7! it looks like White has a number of moves which need to be checked more carefully.  This looks to be a weak point of the entire Blumenfeld as far as I can see, mainly because Black seems to lack good alternatives at move 7, and his earlier deviations do not appeal to me as much (postponing d5 or playing an early a6).

I would like to rule out White's alternatives at move 9 and 10, but things are not yet clear.  For example, the sequence 10.Ng5 Ndxe5 11.f4 dxc3 12.Qxd8+ Kxd8 13.fxe5 seems to be virtually forced from Black's perspective, and at the end, he is left in a difficult position where his pawns are weak and obstruct his pieces.

A much lesser concern, 5.cxb5 seems to be more annoying than I had hoped.  What do you guys think is best: 5...Nxd5 intending to meet e4 with Nb6/d5 and exd5 with Nxd5, or simply 5...exd5 intending to hold the center with Bb7 and Qa5(+) if needed, or something else entirely?

Finally, having acquired Przewoznik, I can agree with what MNb says: a good if rather chaotic text.  It would be nice if he had singled out what he thought the most promising continuations were, since his own praxis sees just about every possible Black move.  I'm also not too enthusiastic about his treatment of the early deviations which I mentioned above (Bb7 before d5, a6 as soon as possible) but perhaps playing this way will prove necessary.
  
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Re: Coverage of the Blumenfeld
Reply #26 - 06/02/06 at 03:36:12
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HgMan wrote on 06/01/06 at 22:14:11:
I presume, of course, that 7 ... Ne4 must be the mainline, but Black does not seem to score particularly well here.  8 Bd2 Nxd2 9 Nxd2 d6 10 e4 seems to take all the fun out of the position for Black...


Already checked Browne-Ljubojevic, Buenos Aires 1979?
  

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Re: Coverage of the Blumenfeld
Reply #25 - 06/02/06 at 02:47:32
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Hey guys, I was looking over these Bloomenfeld lines and I think I've got an improvement (maybe it's already been suggested somewhere else, though?).  After 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 b5 5.Bg5 Qa5 6.Qd2 Qxd2+ 7.Nfxd2!  bxc4 8.Bxf6 gxf6 9.e4 Na6 10.a3, I propose 10...Nc7!  instead of 10...Rb8.  The idea is to put pressure on the d5 pawn so that White can't play Nxc4.  Also, after White played 10.a3, it's pretty clear that the Knight has to go to c7 anyway, so we may as well put him there right away, keeping our options open regarding the light-squared Bishop and the Rook for a couple more moves.

Thoughts?  After 11.Nc3 Bb7! 12.Bxc4, we've forced White to put the Bishop on c4 instead of the Knight.  Looks about equal to me.
  
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Re: Coverage of the Blumenfeld
Reply #24 - 06/01/06 at 22:14:11
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I presume, of course, that 7 ... Ne4 must be the mainline, but Black does not seem to score particularly well here.  8 Bd2 Nxd2 9 Nxd2 d6 10 e4 seems to take all the fun out of the position for Black...
  

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Re: Coverage of the Blumenfeld
Reply #23 - 06/01/06 at 21:57:46
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MNb wrote on 03/28/06 at 03:31:14:
I have taken another look at the 5...Qa5+ variation and I find Black's play rather depressing. 10...f5 11.f3 fxe4 12.fxe4 exd5 13.exd5
a)13...Bg7 14.Nc3 Rb8 14.o-o-o o-o 16.Bxc4 Nc7 17.Nde4 Vucic-Gurevich, St Martin Open 1993.
b)13...Rb8 14.Nxc4 Bb7 15.Nc3 Nc7 transposes to Izsak-Van Beers, Vejen 1993. The game went 16.Rd1 Bg7 (Rg8 17.Ne4) 17.Nd6+ Kf8 18.Bc4 Be5 19.Nce4 Ne8 20.Nf5.
In both games I only see active knights, no active bishops.
So I tend to prefer 5...exd5 too. My choice would have been 6.cxd5 Qa5+ 7.Nc3 Ne4 8.Bd2 Nxd2 9.Nxd2 d6 striving for a kind of Modern Benoni. I do not trust the old main line 6...h6 7.Bxf6 Qxf6 8.Qc2 d6 9.e4 a6 10.a4 b4 11.Nfd2 and again the knights go to the ideal squares c3 and c4. Moreover here 11.Nbd2 Bg4 12.e5! is not an easy walk either.


I think MNb's line might be the best way out of the thicket.  I just posted on the Nimzo thread on 1 d4 Nf6 2 c4 e6 3 Nf3 c5 4 d5 b5 5 Bg5 exd5 6 cxd5 h6 7 Bxf6 Qxf6 8 Qc2! (maybe it doesn't deserve a "!" but I think it's markedly stronger than 7 Nc3).  So:

1 d4 Nf6 2 c4 e6 3 Nf3 c5 4 d5 b5 5 Bg5 exd5 6 cxd5 Qa5+ 7 Nc3

I'm not sure that 6 ... Qa5+ 7 Nc3 resolves any of Black's queenside problems.  I like 7 ... Be7 8 d6 Bd8, which turns out okay if Black can find some way to activate his/her queenside pieces.  But look at 7 ... Be7 8 Qd2! 0-0 9 d6 Bd8 10 Bxf6 Bxf6 11 Nd5 Qxd2+ 12 Nxd2; Black is really hurting!

Instead: 6 ... Qa5+ 7 Nc3 d6 (which Black has to play at some point anyway...) 8 Bxf6 gxf6 9 Qd3 c4 10 Qe4+ Be7 and Black might even have a reasonable game on the queenside, so long as the fractured pawn structure on the kingside doesn't become too serious a liability.  I suppose an alternative to 9 ... c4 is 9 ... Bd7, but I'm not sure I want to pin down my pieces to passive defense.  Having said that, I'm worried about 11 Nd4 when the f5 square looks vulnerable.  11 Nd4 b4 12 Nd1 f5 13 Nxf5 Bxf5 14 Qxf5 Nd7 15 e3 c3 16 bxc3 bxc3.  Black may have some compensation for the pawn, but I'm not sure I would like to play Black here...
« Last Edit: 06/02/06 at 11:20:23 by HgMan »  

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Re: Coverage of the Blumenfeld
Reply #22 - 05/20/06 at 05:25:48
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Great game; Knaak's one of my favourite players.
  
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Re: Coverage of the Blumenfeld
Reply #21 - 05/20/06 at 04:06:08
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Here's a beautiful game -- one of the most spectacular I have seen in some time.  If it is new to you, I hope that you enjoy it as much as I did.

Garcia Martinez,S (2450) - Knaak,R (2490) [E10]
Tunja Tunja (5), 1984

1.d4 Nf6 2.c4 c5 3.d5 b5 4.Nf3 e6 5.Bg5 h6 6.Bxf6 Qxf6 7.Nc3 b4 8.Ne4 Qxb2 9.Rb1 Qa3 10.e3 f5 11.Ne5 fxe4 12.Qh5+ Kd8 13.Nf7+ Kc7 14.Nxh8 g5 15.Nf7 Qc3+ 16.Kd1 d6 17.h4 Bd7 0-1

This is the only game with 8.Ne4 in my database...
  
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Re: Coverage of the Blumenfeld
Reply #20 - 05/19/06 at 12:10:54
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Buying Przewoznik saves you some time, as all old and new main lines are treated. He offers quite some new (already old) ideas and spends a lot of time on typical structures. Unfortunately his book is a bit chaotic mix of variation tree and annotated games book. He will lead you in the right direction, but there will still remain work to do.
  

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Re: Coverage of the Blumenfeld
Reply #19 - 05/19/06 at 05:27:33
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(Just to note that there is another thread on the Blumenfeld at http://www.chesspub.com/cgi-bin/yabb2/YaBB.pl?num=1143385887)

I feel like though the lines ErictheRed mentions are critical, they are also quite unclear and if Black is careful to hold the center together he seems to do quite well.  It may turn out that such a strategy is not possible for Black in general, though...

I'm more immediately interested in seeing what the response to 5.Bg5 ought to be.  I don't think that 5...Qa5+ is so great, in part because of the lines mentioned above, and so I've been initially looking at some of the fascinating lines after 5...h6, in particular 6.Bxf6 Qxf6 7.Nc3 b4 8.Nb5 Kd8.  The whole enterprise requires more study than I've given it so far, but Black's position, if chaotic, is surprisingly resilient.  Has this line been put out of business?

As a side note (which may be quite relevant if these things are discussed there), I've ordered a copy of Przewoznik's text, mainly because it was so cheap, it seemed silly not to have it if I was going to look at these lines -- it seems to have been positively received when it came out, but is it still reliable?
  
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Re: Coverage of the Blumenfeld
Reply #18 - 05/17/06 at 02:38:06
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Yes, that is critical. 6...d5 7.g3 Bd6 (maybe Be7 with the same idea) 8.Bg2 Bb7 9.o-o o-o and Black has two plans: play on the queenside with x...a6 7.bxa6 Rxa6 and play on the kingside with the manoeuvre Qd8-e8-h5, in the ideal case combined with e6-e5.
  

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Re: Coverage of the Blumenfeld
Reply #17 - 05/16/06 at 14:27:40
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That's true, MNb.

I've never played the Blumenfeld for either side (except in blitz), but one line that really puts me off is 5.de fe 6.cb and 7.g3.  Has Black got anything special here?
  
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Re: Coverage of the Blumenfeld
Reply #16 - 05/16/06 at 02:43:54
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Don't know. But after 7...b4 one thing is sure: Black cannot play x...exd5 as after 9.cxd5 the important c4 square is free for a knight.
  

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Re: Coverage of the Blumenfeld
Reply #15 - 05/15/06 at 23:27:38
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Just curious: is there anything wrong with the obvious (to me at least) 7...b4 (after MNb's 7. Nfxd2!)?  This move makes White's knight on b1 look kind of silly.  White's probably still better, but Black seems OK after something like 8.Bxf6 gf 9. g3 Bb7 10.g3 f5 (note that 9.e4 f5 10.exf5 Bg7! is complicated but probably equal).
  
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Re: Coverage of the Blumenfeld
Reply #14 - 03/28/06 at 03:31:14
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I have taken another look at the 5...Qa5+ variation and I find Black's play rather depressing. 10...f5 11.f3 fxe4 12.fxe4 exd5 13.exd5
a)13...Bg7 14.Nc3 Rb8 14.o-o-o o-o 16.Bxc4 Nc7 17.Nde4 Vucic-Gurevich, St Martin Open 1993.
b)13...Rb8 14.Nxc4 Bb7 15.Nc3 Nc7 transposes to Izsak-Van Beers, Vejen 1993. The game went 16.Rd1 Bg7 (Rg8 17.Ne4) 17.Nd6+ Kf8 18.Bc4 Be5 19.Nce4 Ne8 20.Nf5.
In both games I only see active knights, no active bishops.
So I tend to prefer 5...exd5 too. My choice would have been 6.cxd5 Qa5+ 7.Nc3 Ne4 8.Bd2 Nxd2 9.Nxd2 d6 striving for a kind of Modern Benoni. I do not trust the old main line 6...h6 7.Bxf6 Qxf6 8.Qc2 d6 9.e4 a6 10.a4 b4 11.Nfd2 and again the knights go to the ideal squares c3 and c4. Moreover here 11.Nbd2 Bg4 12.e5! is not an easy walk either.
  

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Re: Coverage of the Blumenfeld
Reply #13 - 03/26/06 at 20:19:55
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For what it's worth, the top players tend to prefer 5 Bg5 exd5...
  

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Re: Coverage of the Blumenfeld
Reply #12 - 11/15/04 at 16:21:18
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I think that Black can improve by playing 10...f5. It important for black to put pressure on the center and get some lines for his bishop.
11.de6 fe6 12.e5 d5 13.ed6 Bd6. 14.Nc4  Black has two nice bishops with plenty of open lines.

Gearoid
  
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Re: Coverage of the Blumenfeld
Reply #11 - 11/05/04 at 22:15:30
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At the main page of chesspub I read, that Glenn Flear
does not think too high of 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 b5 5.Bg5 because of Qa5+. Now I have not subscribed for several reasons (low salary, impossibitlity of transferring money from Suriname), but still I am curious about 6.Qd2 Qxd2+ 7.Nfxd2! (very common in the Blumenfeld) bxc4 8.Bxf6 gxf6 9.e4 Na6 10.a3 Rb8 11.Nxc4 Nc7 12.Nc3 a6 13.a4 (prevents Nb5) d6 14.Bd3 Bb7 15.o-o-o Bh6+ 16.Kc2 Bf4 17.Ne2 exd5 Jongsma-Przewoznik, Haarlem 1980 (with a small transposition) and now Przewoznik in his book on the Blumenfeld gives 18.exd5! Nxd5 19.Nxf4 Nxf4 20.Nxd6+ Kf8 21.Nxb7 with almost a won position. The Black pawns are weak but his bishops are not too active.
Are there any improvements for Black?
  

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Re: Coverage of the Blumenfeld
Reply #10 - 11/05/04 at 13:37:22
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Lot of general chit chat about this line but as yet no  hard coverage.

So  let start at the begining is whites best line to take the pawn or should he decline the gambit by say Bg5
  
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Re: Coverage of the Blumenfeld
Reply #9 - 07/12/04 at 09:41:36
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So you can have a Blumenfeld (E10) via A57.
Noone said the ECO code system was easy!

My Daring Defences section has the most complicated set of codes so even I have to check them from time to time.
  
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Re: Coverage of the Blumenfeld
Reply #8 - 07/12/04 at 09:37:55
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Yes the Blumenfeld is covered by the 'Daring Defences site.
This is logical as you can consider it as a Benko where 4 Nf3 is met by 4...e6.
  
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Re: Coverage of the Blumenfeld
Reply #7 - 05/06/04 at 23:06:42
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The Blumenfeld, ECO code E10, is indeed covered under "Daring Defenses", although IIRC the last time it had an update was in 2002 by Jon Tisdall. Anyway, there are around 35 0r 40 annotated games that can be downloaded with ChessPub.
  
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Re: Coverage of the Blumenfeld
Reply #6 - 05/06/04 at 17:41:08
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According to the page source the codes the sections cover are:

King pawn openings, ECO Codes C20- C99

The French Defence, ECO Codes C00- C19, A04 & A08

The Dragon, ECO Codes B27, B34- B39 & B70-B79

Open Sicilians, ECO Codes B32- B33, B40-B69 & B80-B99

Anti-Sicilians, ECO Codes B20- B31, & B50-B55

1 e4 Various, ECO Codes B00- B19

1 d4 d5, ECO Codes D06- D07, D10-D69 & E01-E09

Other d-pawn Openings, ECO Codes A45-A49, & D00-D05

KID, ECO Codes A41- A42, A53-A55, A68-A69 & E60-E69

Nimzo-Indian, QI, Bogo & Benonis, ECO Codes A43-A44, A56, A60-A67, A70-A79, E00 & E11-E59

Dutch, Grunfeld and other Daring Defences, ECO Codes A40, A50-A52, A57-A59, A80-A89, B00, D08-D09, D71-D99 & E10

Flank Openings, ECO Codes A00- A39, without A08
  
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Re: Coverage of the Blumenfeld
Reply #5 - 05/06/04 at 17:26:04
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Hmmm, my browser doesn't display the codes,  Perhaps my version is too old or I can't display Java.  Dangit  Sad
  
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Re: Coverage of the Blumenfeld
Reply #4 - 05/06/04 at 16:19:24
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If you're using Internet Explorer and you're on the main page, when you highlight the links for each section on the left, look at the bottom of the screen.  The part of the screen that shows how far pages are loaded displays the ECO codes, thanks to our friend HTML (or maybe it's Javascript?).

ECO codes are there, just gotta pay attention  Undecided
NeX iRae
  
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Re: Coverage of the Blumenfeld
Reply #3 - 05/06/04 at 14:56:20
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4...b5, right?  This question highlights the point I brought up earlier.  Why isn't there a list stating exactly which ECO codes are associated with each section?  If such a list exists I haven't been able to find it.  The list of ebooks is helpful but not inclusive.
  
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Re: Coverage of the Blumenfeld
Reply #2 - 05/06/04 at 14:18:31
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I would suppose so, it's more daring than the Benko which is covered here...
  
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Re: Coverage of the Blumenfeld
Reply #1 - 05/06/04 at 14:06:00
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Huh?
  
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Coverage of the Blumenfeld
05/06/04 at 12:22:46
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Hi,

Is the Blumenfeld treated here? I am referring to

1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 b5


Thanks
« Last Edit: 05/06/04 at 17:30:49 by Fernando Semprun »  

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