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Very Hot Topic (More than 25 Replies) Alekine's Defence, Voronezh 9...Bf5 New Ideas? (Read 46495 times)
Kam
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #15 - 08/03/14 at 02:24:47
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The second part of this investigation looks at the critical continuation 10.
Be2 e5 11.Nf3 Re8!?

  
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Kam
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #14 - 07/03/14 at 15:18:48
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Alekhine's Defence Voronezh Var. 9.... Bf5, White Plays 10.Be2 and Possible
Continuations. Part 1.  10.Be2 e5  11.Nf3 e4 and 11....Na6?!    The discussion
topic is divided into three sections    1) 10.Be2 e5  11.Nf3 e4 and 11....
Na6?!  2)  10.Be2 e5  11.Nf3 Re8!?  3) 10.Be2 e5  11.dxe5 and d5


  
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #13 - 08/28/13 at 18:38:42
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This game was played today in the topical line of this thread

Not sure whether after 10.Nf3 the recommended move is 10...e5, 10...d5 or 10...Bg4

After 10...d5 as played, thegame looked like a "normal" exchange


Korkmaz,Necmettin (2162) - Chighladze,Iveri (2385) [B03]
11th Kesan Open Kesan (4.6), 28.08.2013

1.e4 Cf6 2.e5 Cd5 3.d4 d6 4.c4 Cb6 5.exd6 cxd6 6.Cc3 g6 7.Be3 Bg7 8.Tc1 0-0 9.b3 Bf5 10.Cf3 d5 11.c5 Cc8 12.b4 a6 13.Db3 Cc6 14.Be2 e6 15.0-0 Bg4 16.Tfd1 C8e7 17.a4 Cf5 18.b5 Bxf3 19.bxc6 Bxe2 20.cxb7 Bxd1 21.Cxd1 Tb8 22.c6 Dc7 23.Dc3 Ce7 24.Rf1 Cxc6 25.Dxc6 Dxb7 26.Dxb7 Txb7 27.Tc6 Ta8 28.Re2 Tb4 29.Rd3 Txa4 30.Cc3 Tb4 31.Ca2 Tb2 32.Cc3 a5 33.Ca4 Tb3+ 34.Rc2 Tb4 35.Cb6 Tb8 36.Cd7 Td8 37.Ta6 Bxd4 38.Bxd4 Txd4 39.Ce5 Tc8+ 40.Rb3 a4+ 41.Ra3 Te4 42.Cc6 Rg7 43.g3 d4 44.Rb4 a3 45.Rxa3 d3 46.Rb3 d2 47.Rc2 Tc4+ 0-1

  
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #12 - 08/16/13 at 21:58:38
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Well, at long last, the line 9...Bf5 against the Voronezh variation has been noticed by one of the Chess Publishing authors! (See the August 2013 update).

Well done Tom Rendle!

(And shame on your predecessors.)

PS Although Tom seems blissfully unaware of this thread, as evidenced by the fact that he thinks that after the critical 10 Be2, the best reply is 10...Nc6. All of us Alekhine (sufferers X) fans know that Black's position is pretty miserable after 9...Nc6 10 d5, and inserting ...Bf5 and Be2 does not really change this.)

  
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #11 - 07/17/11 at 11:59:13
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A rare (and inconclusive?) GM trial of 9...Bf5 against the Voronezh. These days Spraggett varies his openings a lot, so he is only a "part-time" Alekhine player. He has previously had a decent score with the "boring" 5...exd6 line, also favoured by Larsen in his day.

Velicka,Petr (2461) - Spraggett,Kevin Barry (2573)
I Open Internacional - Cidade de Aveiro Centro Cultural e de Congress (4.1), 09.07.2011

1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.c4 Nb6 5.exd6 cxd6 6.Nc3 g6 7.Be3 Bg7 8.Rc1 0-0 9.b3 Bf5!? 10.Be2 d5 11.c5 Nc8 12.Bf3 e6 13.Nge2 Nc6 14.0-0 N8e7 15.Ng3 e5 16.Nxf5 Nxf5 17.Nxd5 Nfxd4 18.b4 Re8 19.Bxd4 Nxd4 20.Nc3 Re7 21.Ne4 f5 22.Nd6 e4 23.Be2 Be5 24.Nb5 Nc6 25.Qb3+ Kg7 26.Rcd1 Qf8 27.f4 exf3 28.Bxf3 Qf6 29.g3 h5 30.Kg2 1/2-1/2
  

Voro_Bf5_Spraggett.pgn ( 0 KB | Downloads )
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #10 - 02/23/11 at 13:35:58
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Thanks, Luis.

As you will know, since google groups abandoned their commitment to file support, the Alekhine Defense Working Group has been in abeyance.  But as you will also know, I've been working on a website, www.alekhinedefense.org, which will facilitate our activities much better than google groups ever did.  I post this info not to inform you, of course, but others who may be interested in our work.
  

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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #9 - 02/22/11 at 18:14:20
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Alekhine topics and threads a bit on the downside

noticed the follwowing recent Voronezh with the çline
9...e5 (which is still probably the best)

Not sure black played anything new but the balck was never in danger

[Event "TCh-HUN 2010-11"]
[Site "Mako HUN"]
[Date "2010.11.07"]
[Round "2"]
[White "To, N."]
[Black "Grunberg, M."]
[Result "1/2-1/2"]
[ECO "B03"]
[WhiteElo "2426"]
[BlackElo "2414"]
[PlyCount "80"]
[EventDate "2010.10.10"]
[EventType "team"]
[EventRounds "11"]
[EventCountry "HUN"]
[Source "Mark Crowther"]
[SourceDate "2011.02.21"]
[WhiteTeam "Honved"]
[BlackTeam "Mako"]

1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. exd6 cxd6 6. Nc3 g6 7. Be3 Bg7 8. Rc1
O-O 9. b3 e5 10. dxe5 dxe5 11. Qxd8 Rxd8 12. c5 N6d7 13. Bc4 Nc6 14. Ne4 Nf8
15. Nd6 Rd7 16. h4 h6 17. h5 g5 18. Ne2 Rc7 19. Nxc8 Raxc8 20. Ng3 Nd4 21. Bxd4
exd4 22. Nf5 Ne6 23. b4 a5 24. a3 axb4 25. axb4 Ra8 26. O-O Ra4 27. Rb1 Nf4 28.
Rfe1 Ra8 29. g4 d3 30. Kf1 Rd8 31. Bb3 Ne2 32. Rxe2 dxe2+ 33. Kxe2 b6 34. c6 b5
35. Rc1 Bf8 36. Ne3 Rdc8 37. Bd5 Bxb4 38. Rb1 Bc5 39. Rxb5 Bxe3 40. Kxe3 Rxc6
1/2-1/2

  
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #8 - 02/01/11 at 14:00:50
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Kam, impressive work.  Thanks for sharing.

However as always, it's impossible to comment on such dense analysis unless you attach pgn files.

But having analyzed a lot of chess positions, I do have this advice: go broad before you go deep.  The deeper analysis is, the less likely it is to be correct.  I make no supposition about the merit of your work here, but I would be quite surprised if any analysis beyond move 30 or so turned out to be critical for the theory of this variation.

The temptation when analyzing, especially working with a machine, is to chase long variations down rabbit holes.  Much more productive, nineteen times out of twenty, is to question the assumptions underlying the moves played so far.

P.S. I went back and looked at diagram 13 (after 27...h3).  I am can't comment on the posssible importance of this position, and you may be right that Black has a winning attack.    But if I were White there, I would consider 28.Ng3.  If 28...hxg2 I might play 29.Bxg2 but I would also consider 29.Bc4.  If 28...f5 then my idea would be Ngxe4, either before or after the exchange on f5.  Probably before since the g-file is there.

Further in Diagram 19 (after 26...f4), I am rather certain that I would play 26.Ngxe4.
  

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Kam
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #7 - 02/01/11 at 11:33:34
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Alekhine’s Defence Voronezh Variation, 9....Bf5 System.  Part 2B
Central Conflict Involving 10.Nf3 e5  11.Be2 e4 12.Nd2 and 12. Ng5

1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.c4 Nb6 5.exd6 cxd6 6.Nc3 g6
7.Be3 Bg7 8.Rc1 0–0 9.b3 Bf5 10.Nf3 e5 11.Be2 e4  12.Nd2 d5
13.c5 Nc8  14.O-O Re8  15.Re1 Nc6  16.Nf1 Be6!?  17.Qd2 N8e7
18.Nb5 Nf5
Diagram 11.

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The white knight is prevented from accessing to the sensitive d6 square.
The white d pawn is now under persistent decisive pressure.
19.Ng3 Nxe3 20.fxe3 Bf8 21.a3 Diagram 12.

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White tries the thematic slow build up approach, but black has counter-play on
the king side. [21.Nc3 ?! White should have waited for black to use a tempo
to play a6. 21...f5!? 22.Rf1 Bh6 23.Bb5 Qg5 24.Rf4 a6 25.Bxc6 bxc6
26.Nge2 Ra7 27.Na4 Rf7 28.Nb6 a5 29.Rcf1 Ref8 30.Rd1 Qe7 31.Rf2 g5
32.Rdf1 f4 33.exf4 Bg4 34.Qe3 Bxe2 35.Rxe2 gxf4 36.Qf2 Qg5 37.Kh1 f3
38.Ree1 e3 39.Qg3 Qxg3 40.hxg3 f2 41.Re2 Rg7 42.Kh2 Rf6 43.g4 Bf4+
44.g3 Rxg4–+ A crushing win!] 21...f5 [21...h5 A very serious
attacking alternative by black. 22.Bf1 h4 23.Ne2 g5 (23...h3 Intriguing, but
does not quite work. 24.gxh3 a6 25.Nbc3 Bh6 26.Bg2 b5 27.b4)
24.Nbc3 f5 25.b4 Re7 26.Rb1 Rf7 27.Rbd1 h3!? Diagram 13.

* * * * * * * *
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Black has a winning attack. A key down fall in white's position is that the
central backward pawn cannot be easily defended by any of the white
minor pieces. 28.g3 (28.gxh3 Bh6 29.Nb5 f4 30.Nd6 fxe3 31.Qc3 Rf2
32.b5 Ne7 33.Ng3 Qd7 34.Qxe3 Rf3 35.Qd2 Ng6 36.Be2 Rff8
37.Bg4 Nf4=/Ŧ) 28...Rh7 29.Rc1 Qf6 30.b5 Ne7 31.a4 Ng6 32.Kh1 Rc8
33.a5 f4–+ 34.gxf4 gxf4 35.Nxf4 Nxf4 36.exf4 Bh6 37.Qf2 Qxf4
38.Qxf4 Bxf4 39.Rc2 Rf8 40.Nd1 Bg5 41.Be2 Bf6 42.Rd2 Rg7
43.c6 bxc6 44.bxc6 Rc7 45.Rg1+ Kh7 46.Bg4 Bxg4 47.Rxg4 Rg8
48.Rg3 Rxg3 49.hxg3 Rxc6 50.Kh2 Bg5 51.Re2 Rc4 52.Kxh3 Rxd4–+]
22.Rf1?!
White is looking for action along the f file, but the tactics back
fire. [22.Bf1 This move provides a lot more resistance although black can
extract a slight edge. 22...b6 23.b4 bxc5 24.bxc5 a6 25.Nc3 f4 26.exf4 Bg7
27.Nge2 Rb8 28.Rb1 a) 28.Rcd1 Qa5 29.Qa2 Nxd4 30.Nxd4 Bxd4+ 31.Rxd4
Qxc3 32.Qf2 Rb3 33.Bxa6 e3 34.Qxe3 Qxe3+ 35.Rxe3 Rxe3 36.a4–+;
b) 28.Red1 Qa5 (28...Qc7 29.Qc2) 29.Rb1 (29.Qa2 Rb7 30.Kh1 Bf7
31.Nxd5 Rd8 32.Nec3 Bxd4 33.Rxd4 Nxd4 34.Qc4 Nc6 35.Qxa6 Qxa6
36.Bxa6 Ra7 37.Nf6+ Kg7 38.Bb5 e3 39.Nfe4 Nd4 Diagram 14.

* * * * * * * *
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* * * * * * * *
* * * * * * * *
* * * * * * * *
* * * * * * * *
* * * * * * * *
* * * * * * * *


N+2p v R, –1.2, Black has an advantage due to the centralised knight, a
strong central passed pawn  and that white's queen side pawns are isolated
and weak. ) 29...Rxb1 30.Rxb1 Qxa3 31.Qe3 a5 32.Nxd5 Qd3 Diagram 15.

* * * * * * * *
* * * * * * * *
* * * * * * * *
* * * * * * * *
* * * * * * * *
* * * * * * * *
* * * * * * * *
* * * * * * * *



The fall of the white backward pawn, due to the forced deprotection is unavoidable.
33.Nec3 Qxe3+ 34.Nxe3 Bxd4 35.Ncd1 Nb4 36.Kh1 Ba2
37.Bb5 Bxb1 38.Bxe8 Bxc5 39.g3 Bd3 40.Kg2 Be2 41.Ba4 Kg7
42.Bb3 Bd4 43.Ba4 Kf6 44.Bb3 Ke7 45.h4 Kd6 46.h5 gxh5 47.Nf5+ Kc5
48.Nxd4 Kxd4 49.f5 Bxd1 50.Bxd1 Ke5 51.Kf2 Kxf5 52.Ke3 Ke5
53.Ba4 Nd5+ 54.Kd2 Kd4–+; 28...e3 Diagram 16.

* * * * * * * *
* * * * * * * *
* * * * * * * *
* * * * * * * *
* * * * * * * *
* * * * * * * *
* * * * * * * *
* * * * * * * *


An interesting attempt to crash through the centre. White needs to avoid all
the traps and walk a thin line to escape with a draw. 29.Qxe3 (29.Qd3 Rxb1
30.Rxb1 Bf5 31.Qxa6 Nxd4 32.Rd1 Nxe2+ 33.Nxe2 Qc8 34.Qxc8 Rxc8
35.Rxd5 Be4 36.Rd1 Rxc5 37.Rd8+ Kf7 38.Rd7+ Kf8 39.a4 Bf5
40.Rd8+ Kf7 41.Rd1 Ke7 42.Ng3 Bc2 43.Re1 Kd6 44.Bb5 Bc3
45.Re2 Bd4 46.Kf1 Kd5 47.Re1 h5  Diagram 17.

* * * * * * * *
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* * * * * * * *
* * * * * * * *
* * * * * * * *
* * * * * * * *
* * * * * * * *
* * * * * * * *


White may be able to hold on, but white will have some anxious moments!)
29...Rxb1 30.Nxb1 Nxd4 31.Nxd4 Bf7 32.Qd2 Rxe1 33.Qxe1 Bxd4+
34.Kh1 Bxc5 (34...a5) 35.Bxa6 Qd6 36.Qa5 Bd4 37.Qd2 Qxa6
38.Qxd4 Qf1+ 39.Qg1 Qxf4 40.Qe1 d4 41.a4 Diagram 18.

* * * * * * * *
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* * * * * * * *
* * * * * * * *
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* * * * * * * *
* * * * * * * *
* * * * * * * *
*

Black has an advantage, but white may have enough resources to hang
on. 41...d3 42.a5 Qc4 43.h3=/Ŧ] 22...a6 23.Nc3 Bh6 24.b4 [24.Na4 f4
25.exf4 Qf6 26.Rcd1 Rad8 27.Qc3 Bg7 28.Rf2 Nxd4 29.Qe3 Nxe2+
30.Qxe2 Qf7 31.c6 bxc6 32.Nc5 Bc8 33.b4 a5 34.f5 axb4 35.axb4 gxf5
36.Nxf5 Bxf5 37.g4 Bxg4 38.Qxg4 Qg6 39.Qxg6 hxg6 40.Rc2 Re5–+;
24.Bd1 Qg5 25.Rf4 Qf6 26.Nge2 Bxf4 27.Nxf4 Rad8 28.b4 g5 29.Nh5 Qh6
30.Qf2 f4 31.exf4 gxf4 32.Qxf4 Qxf4 33.Nxf4 Nxd4 34.Bh5 Bf7 35.Bd1
(35.Bxf7+ Kxf7 36.Rf1 Kg7) 35...e3 36.g4 Re5 37.Kg2 Nc6–+] 24...Qg5!
25.Rf4 Qf6 26.Rff1 f4
Diagram 19.

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* * * * * * * *
* * * * * * * *
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The black kingside offensive is now unstoppable. Whatever happened to
white's attempt to demolish the black queenside? 27.Bg4 fxe3
28.Qe1 Qe7–+ 29.Bxe6+ Qxe6 30.Nge2 Rf8 31.Qh4 Bg7 32.Rcd1 Rxf1+
33.Rxf1 Bxd4 34.Nxd4 Nxd4
Diagram 20.

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The centre is overrun by stampeding black pawns and the white counterparts
are gone. Despite some stubborn resistance, defeat is inevitable for white.
35.Qg5 Nf5 36.Ne2 h6 37.Qg4 h5 38.Qg5 Kh7 39.Ng3 Nxg3 40.Qxg3 e2
41.Re1 Rf8 42.Rxe2 d4 43.Qh4 Qf5 44.Qe1 e3 45.h3 Qe4 46.Kh1 Re8
47.Ra2 d3 48.c6 e2 49.cxb7 Rf8 50.Kh2 Qf4+–+ 
Diagram 21.


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* * * * * * * *
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Conclusions: White had adopted a "conventional Voronezh variation"
approach against the 9... Bf5 system and Black did not encounter any
serious problems. A slight inaccuracy was made by white and black was able
to crash through the centre. The Voronezh Variation has the reputation of
a) Smashing the black queenside and b) Providing safe passage for the queenside pawns.
It seems that if white does not contest black's strong
presence in the centre (ie 14.f3 etc) the white d4 pawn becomes under
intense attack and white's queenside attack is very feeble. The key draw back
in this variation is 12.Ng5 which may tend to lead to drawish positions, which
have almost identical symmetrical pawn structures devoid of central pawns.      
None of the analysed 12.Nd2 lines were able to trouble black,
who can confidently play for a win with refreshing vibrant play.
The Voronezh is renown for the board trembling white queen side pawn roller,
but against the 9... Bf5 system,  the kingside pawn majority can be just as
imposing and in some cases, the white king can be caught up in the carnage.

  
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #6 - 01/15/11 at 12:14:20
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Alekhine’s Defence Voronezh Variation,9....Bf5 System.  Part 2.
Central Conflict Involving 10.Nf3 e5  11.Be2 e4 12.Nd2 and 12. Ng5

1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.c4 Nb6 5.exd6 cxd6 6.Nc3 g6
7.Be3 Bg7 8.Rc1 0–0 9.b3 Bf5 10.Nf3 e5 11.Be2 e4
Diagram 1.

* * * * * * * *
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* * * * * * * *
* * * * * * * *
* * * * * * * *


The counter-attacking centre pawn is supported by the actively developed
bishop, at least in the short term. White's pieces become slightly
unco-ordinated, but the black e4 pawn becomes a major target. Such is life for a
courageous centre pawn! 12.Nd2 [12.Ng5 is a serious alternative and
a possible continuation is  12...Nc6 13.Ngxe4 Bxe4 14.Nxe4 d5 15.Nc5 dxc4
16.0–0 Nxd4 17.Bxc4 Nf5 18.Qxd8 Raxd8 19.Bg5 Rd4= 20.Bd3 h6
21.Bxf5 (21.Bd2 Rxd3 22.Nxd3 Rd8 23.Rcd1 Rxd3 24.g4 Nh4
25.Be3 Rc3Ŧ; 21.Be3 Nxe3 22.fxe3 Rdd8 23.Rfd1 Nd5 24.Nxb7 Rb8
25.Bc4 Nxe3 26.Rd7 Bb2 27.Rb1 Ba3 28.h3 Nxc4 29.bxc4 Rfe8=)
21...hxg5 22.Be4 Rd2 23.a4 Nd5 24.Bxd5 Rxd5 25.Nxb7 Bd4 Diagram 2.

* * * * * * * *
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* * * * * * * *
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The white knight and the unprotected backward b pawn are on the same
open file. The knight cannot drop back to c5 and thus recapture of the extra
pawn is inevitable. 26.b4 Rb8 27.Na5 Rxb4 28.Nc6= Rb7 29.Rfd1 Rbd7=]
12...d5 13.c5 [13.cxd5 Is another important variation, and it may be discussed at
another date. A continuation is  13...Nxd5 14.Nxd5 Qxd5]
13...Nc8 White has seized space in the centre, but consequently the
d pawn is backward. 14.0–0 White's strategy is to steer the game to
a conventional  Voronezh game plan. ie a) Utilize the queen side pawn
majority and mobilise a Q-side pawn storm.  b) Assume black's kingside attack
is too slow,  c) Assume that black's pieces are too tangled up in the restricted
space and that counterplay through the centre is not a viable option. Let the
truth be known, only one of the three criteria for white is satisfied. [14.f3
A plausible alternative and a possible continuation is  14...Nc6 15.0–0 Re8
(15...Nxd4 16.fxe4 Re8 17.Bf3 Nxf3+ 18.Qxf3 dxe4 19.Ncxe4 Qd3
20.g4 Be6 21.Rce1 f5 22.gxf5 Bxf5 23.Ng3 Be6 24.Qe4 Qxe4 25.Ndxe4)
16.fxe4 dxe4 (16...Nxd4 17.Bf3 dxe4 18.Ndxe4 Be5 19.Re1 Ne7 20.Nd6 Nxf3+
21.Qxf3±) 17.d5 Bxc3 18.Rxc3 Qxd5 19.Nc4 Qxd1 20.Rxd1 Be6= Diagram 3.

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* * * * * * * *
* * * * * * * *


Black is a pawn up, but the black QR is undeveloped and the knight at c8
is committed to protecting the d6 square. Black does need time to unravel, but
I cannot see an effective attacking plan which gives white the advantage.
21.Nd6 (21.Bg5 Nb4 22.a3 Nd5 23.Rc2 Kg7) 21...Nxd6 22.cxd6 Bd7
(22...a6 23.Bb6 Bd7 24.g4 Kg7 25.Kf2 Rac8 26.Kg3 h6 27.h4 Re6
28.Be3 Re5) 23.g4 f6 24.h4 Rac8 25.g5 f5=] 14...Re8 15.Re1
[15.g4 Be6 16.f4 Ne7 17.Nb5 Nbc6 18.Nd6 f5 19.Nxe8 Qxe8
20.Rf2 Bxd4 21.Bxd4 Nxd4 22.gxf5 Ndxf5 23.Nf1 d4 Diagram 4.

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R v N+p, but black does have a pair of dangerous hanging pawns.
24.Ng3 Qc6 25.Bg4 e3 26.Re2 Nh4 27.Bxe6+ Qxe6 28.Qd3 Re8
29.Rf1 Nc6–+ Diagram 5.

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The connected central pawn couple and the aggressive probing knights
will ultimately force white to shed material. Black is threatening Nb4 or Qd5
followed by Nf3+ etc. 30.Rd1 Nb4 31.Qb5 Nd5 –+] 15...Nc6 16.Nf1 Be6!? Diagram 6.

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The vacating of the f5 square allows either the charge of the f pawn or an
outpost option for the back rank c8 knight. 17.Qd2 An attempt to
dominate the dark squares if black is too eager to advance forward the king
side pawns. [17.Ng3 h5 18.f3 h4 19.Nf1 exf3 20.Bxf3 N8e7 21.g4 hxg3
22.Nxg3 Qa5 23.Re2 b6 24.Na4 b5Ŧ; 17.Nb5 a6; 17.f3 N8e7 18.fxe4 dxe4
19.Nxe4 Nf5 20.Bf2 Ncxd4 21.Bc4 Bd5=/Ŧ (21...Bxc4 22.Rxc4 b5
23.Rc1 Qd5 Diagram 7.

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A strong move, which could be easily overlooked. I certainly would be initially
hesitant to play this move. The black queen has "walked" into a pin, but white's
central knight is in immediate danger. 24.Qd3 Re6 25.Nfd2 Rd8 Diagram 8.

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* * * * * * * *


White has a dangerous passed pawn, but black does have effective control of
the centre. 26.Kh1 Qc6 27.Nf3 Rd7 28.g4 Nxf3 29.Qxf3 Nd4 30.Qg2
(30.Bxd4 Bxd4 31.Rcd1 Bxc5 32.Nf6+ Rxf6 33.Qxc6 Rxc6 34.Rxd7+-)
30...h6 31.Rcd1 b4 32.Rd2 Rd8 33.Rd3 Qe8 34.Bh4 Rd5 35.Rdd1 Qd7=/Ŧ)
22.Nfg3 Nxg3 23.Nxg3 Rxe1+ 24.Qxe1 Bxc4 25.Rxc4 Qd7 26.Qf1 Re8
27.Rc1 h5 (27...f5) 28.Re1 Rxe1 29.Qxe1 Qd5 30.Ne4 Ne6 31.Kf1 Qd3+
32.Kg1 Qc2 33.Nd6 Qxa2 34.b4 Qb3 35.Be3 Bc3 36.Qf1 Nd4
37.b5 Qd5Ŧ Diagram 9.

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One of the hanging pawns is facing inevitable demolition. White cannot
adequately defend against the threats of b6 and Bb4.] 17...N8e7
[17...f5 18.Ng3 a6 19.Bf1 (19.h4 Qxh4 20.Bg5 e3 21.Bxe3 Bf7 22.Nf1 Bxd4=/Ŧ)
19...N8a7 20.Nge2 Nb5 21.Nf4 Nbxd4 22.Ncxd5 Be5 23.Nxe6 Nxe6 24.Bc4=]
18.Nb5 [18.Red1 Nf5 19.Bg5 Qc8 20.Ne3 Nfxd4 21.Ncxd5 Bxd5 22.Nxd5 Qf5
23.Nc3 Re5 Diagram 10.

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Winning of the passed c pawn is inevitable. Black's occupation of the centre
is impressive. A key to white's problems is that the white light square bishop can
neither force the black queen from the important f5 square, nor
participate in an attacking role. 24.Be3 Rxc5 25.Bf1 (25.Bc4 b5–+)
25...Rd8 26.Qe1 Re5 27.Bxd4 Rxd4 28.Rxd4 Nxd4 29.Qe3 Re8 30.Ne2 Qd5
31.Rc4 Nc6 32.Nc3 Bxc3 33.Rxc3 Rd8 34.g4 b6 35.Rc1 Ne5 36.Be2 Rd7
37.Rd1 Nd3 38.f3 f5Ŧ; 18.a3 Too slow and the d4 pawn cannot be successfully
defended unless there is loss of material. 18...Nf5 19.Nb5 a6 20.Nd6 Nxd6
21.cxd6 Qxd6 22.b4 f5Ŧ Black is a pawn up.]  To be continued.


  
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Phil Adams
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #5 - 12/30/10 at 14:02:53
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Also see

Phil Adams wrote on 07/30/10 at 20:14:41:
Phil Adams wrote on 07/30/10 at 14:58:03:
To be frank I have not noticed much happening with the Alekhine recently but this week in the British Championship the Polish (!) player (don't ask  Smiley ) Tymrakiewicz has been playing 9..Bf5 against the Voronezh!

I've attached some analysis of his game against M.Rich which shows that one of the ...d5 lines that I initially dismissed as bad for Black in fact seems to provide interesting compensation.

Today Tymrakiewicz has played an interesting sacrificial line first analysed at the forum's Alekhine offshoot, the Alekhine Defence Working Group! More on this later.

A big thankyou to Luis for drawing my attention to these games!


As promised, here (attached, with light notes) is today's game featuring 9...Bf5 against the Voronezh. It features a successful first (as far as we know) outing for a sacrifice proposed by Mark Morss and included in the Alekhine Defense Working Group's extensive survey of 9...Bf5.


I have resurrected this thread in the hope that whoever will be running this section of Chess Publishing in the New Year will give us some IM/GM feedback on the work that was done here on this line in 2010.

I've attached a recent game by Chetverik with my light annotations.
  

MakkVsChetverik.pgn ( 6 KB | Downloads )
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #4 - 04/19/10 at 01:24:08
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I was able to find the other Chesspub thread via google.

Recent Tries in the Alekine-Voronezh

www.chesspub.com/cgi-bin/yabb2/YaBB.pl?num=1181475000
  
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Kam
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #3 - 04/17/10 at 13:12:43
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My investigation on this line of the Alekine Defence Voronezh is based on the valuable discussions
by Paddy, Old Grizzly and Markovich in the following thread.

Building an Alekine Repertoire:
http://www.chesspub.com/cgi-bin/yabb2/YaBB.pl?num=1228335807

There was another relevant thread, but unfortunately
I cannot find it.



  
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #2 - 04/15/10 at 14:11:32
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Thanks Kam, looks very interesting. However, those of us who like to analyse would find it easier to give you some feedback if you posted the material in pgn (please!).
  
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #1 - 04/15/10 at 09:54:46
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Kam

Perhaps it could have been usefull to write this post with "memory". That is, with pointers to what some
of the contributors have posted here, in another thread, on the same line.
  
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