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Very Hot Topic (More than 25 Replies) Alekine's Defence, Voronezh 9...Bf5 New Ideas? (Read 17203 times)
GabrielGale
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #45 - 09/17/16 at 23:15:40
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@Paddy, it is GM-elect Moulton Ly  Wink  Grin He has everything he needs for the title and now in the 3-months notification period (part of the rules). He is Australia's 6th GM (not going into old old Aussie chestnut whether a certain US GM is Australian).
In contrast to England, Australia is slowly producing GMs, albeit in a trickle, not a flood like the USA.
Now back to the Voronezh 9...Bf5.
« Last Edit: 09/18/16 at 08:56:03 by GabrielGale »  

http://www.toutautre.blogspot.com/
A Year With Nessie ...... aka GM John Shaw's The King's Gambit (http://thekinggambit.blogspot.com.au/)
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Paddy
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #44 - 09/17/16 at 15:28:09
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In the latest update at Chess Publishing IM Moulthun Ly annotates two games featuring 9...Bf5, including one of his own games (a win with Black vs. R.Sardana 2403).

I think it's good to see this line being taken seriously. I was about to write "at last", but that would not be quite fair. Nevertheless, despite all the attention it has received here on the Forum, I think only two games with 9...Bf5 have been previously annotated at Chess Publishing.
  
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lg
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #43 - 04/20/16 at 11:51:32
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I liked it too, a lot !!!

Good explanations, good survey of alternative lines.

In fact, it is nice to see these comments by someone that is, "acquainted" with the Alekhine.

I have seen some comments on Alekhine games which, in my opinion, are a bit offside, simple because the commentators have no good knowledge of the defence,
e.g., the comment by Seirawan on Kamsky-s game.

This applies to some commentators on the site, although I would guess that Neil McDonald in not an Alekhine player
but his comments on the games he posted were very nice.

  
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TonyRo
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #42 - 04/19/16 at 20:52:04
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Glad you liked it!  Grin
  
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Keano
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #41 - 04/19/16 at 20:23:46
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TonyRo wrote on 04/19/16 at 16:26:47:
Indeed - 15...Qh4! was probably objectively winning. I have been dabbling around with a YouTube channel as a way to improve my chess, and analyzed the game relatively briefly here, just as an excuse to study it myself. Watch TonyRo on YT at your own peril!  Grin


excellent stuff, just finished watching it. Very good overview of the whole game and lots of lines behind the scenes I hadnt noticed.

Much better than Maurice Ashley!

What was funny during the live show was Seirawan evidently not aware of the massive reputation of the Voronezh - after Rc1 followed by b3 it was something like "not too impressed with White's opening play here, he seems a bit confused..."  Smiley
  
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TonyRo
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #40 - 04/19/16 at 16:26:47
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Indeed - 15...Qh4! was probably objectively winning. I have been dabbling around with a YouTube channel as a way to improve my chess, and analyzed the game relatively briefly here, just as an excuse to study it myself. Watch TonyRo on YT at your own peril!  Grin
  
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Keano
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #39 - 04/19/16 at 12:35:37
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A tragedy for Kamsky in the end, almost played a brilliancy only to blunder it away. He looked devastated.

Nevertheless this game was very promising news for 9...Bf5 fans. Black came out of the opening with a clear advantage - after ...Bxd4 the more straightforward ...Qh4 looks strongest
  
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TonyRo
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #38 - 04/18/16 at 21:39:42
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Yeah, can't wait to see it finish! In my notes I have 10...e6! as better, but of course given the game that's not a relevant criticism! Wonderful game so far - it doesn't look like Kamsky has played it perfectly, but even so it's been quite a display so far.  Shocked Cheesy Grin
  
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Keano
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #37 - 04/18/16 at 20:11:21
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Here we have the very latest up to date - following the US ch live it looks like Kamsky agrees with myself and TonyRo, or maybe he has been secretly watching this thread  Wink.

Xiong-Kamsky in progress:

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 Bf5
10 d5 e5
11 dxe6 Bxe6
12 Nge2 d5

Black has at least equalized already I'd say, in fact I'd take Black. Good opening play from Kamsky!
  
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TonyRo
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #36 - 04/08/16 at 21:24:00
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9...Bf5 also generally leads to positions that look similar to the non-Voronezh variations in the 5...cxd6 Exchange, which is nice.
  
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Keano
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #35 - 04/08/16 at 19:59:41
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I think the problem with 9...e5 is that it is just too easy for White to handle OTB. Swap Queens and play all the natural moves, meanwhile Black must be accurate simply to stay alive and not get squashed.
  
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lg
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #34 - 04/08/16 at 14:22:15
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I understand the effort to maintain 9...Bf5 as a feasible alternative

However, i wonder what happened to the analysis of 9...e5.
I still remember a thread initiated by the late Markovich titled "defanging the Voronezh" and as far as i recall, the conclusion was that there was no refutation of the line.

I agree that it may be not easy to play in a normal game, but is it real bad?! or not atractive to play?ido not know any refutation of this line;
also many Alekhine writers support the line, e.g.
John Cox, john Watson, etc.
  
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Keano
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #33 - 04/06/16 at 23:00:15
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yep - looks decent enough resources for eventual equality there. Not much winning chances for Black but plenty of resources to level out the game.
  
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TonyRo
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #32 - 04/03/16 at 05:09:33
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Ludde wrote on 03/13/14 at 23:10:52:
I have played 9..Bf5 in a couple of correspondence games and thought I had found the "solution" to the Voronezh until I recently ran into 10.Nf3 d5 11.c5 Nc8 12.h3 Nc6 13.Be2 e6 14.O-O N8e7 15.g4 Be4 16.Ng5 Rb8 17.Qd2 h6 18.Ngxe4 dxe4 19.Rcd1. I will finally hold this game (actually we have reached a rook ending covered by tablebases, so I have no concerns any more - not about discussing the game either) but only after severe agony. The position here is not nice to play at all for black, and requires several "only moves". I seriously doubt it could be held between equals in an OTB game. So at the moment I think it is back to the old 9..e5 which is the only way to go. It is a shame really - in the other games I got nice play with this line, but the continuation above has closed the chapter on 9..Bf5 for me.


This ^^^ is the line in question. In my notes I have 13...Be4 instead (getting the bishop to e4 before Ng5 is possible), intending 14.O-O Bxf3 15.Bxf3 e6, transposing to lines you'd more typically reach via 12.Be2 Bg4 13.O-O Nc6 14.h3, and so on. This line tends to score very badly for White, but it seems to be objectively around equal or so. More critical seems to be 14.Nxe4 dxe4 15.Ng5 Nxd4, when White has a few choices:

a) 16.Bxd4 Bxd4 17.Nxe4 a5!? 18.O-O Na7! Bc4 was T.Ton That Nhu-D.Nguyen, Vung Tau 2002, and now 19...Nc6N seems equal to me.

b) 16.Nxe4N Qa5+ 17.Qd2 Qxd2 18.Nxd2 Nxe2 19.Kxe2 e6 seems very solid to me, but it's also possible that, similar to the idea above, that 16...a5!? or 16...a6!?, intending ...Na7-c6, is good too.

c) 16.O-ON a6! 17.Nxe4 Na7!= and so on.

I'd be interested to hear what people think about this, specifically Ludde, since he probably rejected this idea for some reason.

If a moderator wants to split this off, I'm fine with it - keeping the ...e5 tries consistent and not hijacking Kam's thread seems logical. If not, that's okay too! Grin
« Last Edit: 04/03/16 at 21:08:24 by TonyRo »  
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #31 - 04/03/16 at 04:12:57
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There was a brief discussion of 10.Nf3 d5 and 10.Nf3 Bg4 two years ago with a nice contribution from Ludde in this thread (see posts 41–44):
http://www.chesspub.com/cgi-bin/chess/YaBB.pl?num=1382118239/all

Back then we concluded that this looked good for White, but there may be improvements of course.
  

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TonyRo
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #30 - 04/03/16 at 02:09:42
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I agree, for the most part I think Black is fine there. When I analyzed it I thought White's best attempts were either unplanned or relatively unexplored. But against both 10.Be2 and 10.Nf3 I thought 10....d5 right away was most accurate.
  
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Keano
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #29 - 04/02/16 at 21:28:48
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9...Bf5 is indeed a very interesting attempt.

Fascinating stuff in this thread but just to chime in with my tuppence worth - I would prefer to avoid the ...e5 plans and play more classical Alekhine idea's.

10.Be2 d5!? 11.c5 Nc8
10.Nf3 Bg4!? intending ...d5 next

I think Black may be alive and well here in both lines
  
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Paddy
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #28 - 01/07/16 at 01:28:08
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lg wrote on 01/05/16 at 19:22:19:
"One of the ideas behind 9...Bf5 is to vacate the c8 square for the b6-knight, from where it can go to e7, with much better black coordination than in the main line 9...e5 10 dxe5 dxe5 11 Qxd8 Rxd8 12 c5 Nd7."


[Event "28th Staufer-Open 2016"]
[Site "Schwaebisch Gmuend GER"]
[Date "2016.01.03"]
[Round "4.26"]
[White "Thomas, In"]
[Black "Chetverik, M."]
[Result "0-1"]
[ECO "B03"]
[WhiteElo "2111"]
[BlackElo "2260"]
[PlyCount "32"]
[EventDate "2016.01.02"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "GER"]
[Source "Mark Crowther"]
[SourceDate "2016.01.04"]

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 Bf5 10. Be2 e5 11. dxe5 dxe5 12. c5 Nc8 13. Nf3 Nc6 14. O-O Nd4 15.
Nb5 Nxe2+ 16. Qxe2 Bd3 0-1

Wink


Thanks Ig!  Very timely.

I had already spotted Chetverik as a frequent user of 9...Bf5. He's played it at least eight times.
  
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lg
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #27 - 01/05/16 at 19:22:19
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"One of the ideas behind 9...Bf5 is to vacate the c8 square for the b6-knight, from where it can go to e7, with much better black coordination than in the main line 9...e5 10 dxe5 dxe5 11 Qxd8 Rxd8 12 c5 Nd7."


[Event "28th Staufer-Open 2016"]
[Site "Schwaebisch Gmuend GER"]
[Date "2016.01.03"]
[Round "4.26"]
[White "Thomas, In"]
[Black "Chetverik, M."]
[Result "0-1"]
[ECO "B03"]
[WhiteElo "2111"]
[BlackElo "2260"]
[PlyCount "32"]
[EventDate "2016.01.02"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "GER"]
[Source "Mark Crowther"]
[SourceDate "2016.01.04"]

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 Bf5 10. Be2 e5 11. dxe5 dxe5 12. c5 Nc8 13. Nf3 Nc6 14. O-O Nd4 15.
Nb5 Nxe2+ 16. Qxe2 Bd3 0-1

Wink
  
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Paddy
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #26 - 01/01/16 at 14:14:56
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DenVerdsligeRejsende wrote on 03/07/15 at 00:04:08:
I have the Lakdawala book which gives 9. b3 Bf5 10. d5, then after 10...e5 11. g4 Bc8 12. h4 and following up to me which sees out like a Sæmisch style plan on the kingside by White by pushing the g and h pawns.
What suggest you after 11. g4? I think that 11...Bd7 sees out interesting. Then sack the pawn with 12. h4 e4!? 13. Nxe4 Qe7 14. Bd3 Na6 15. Bg5 Qe5!? trying to induce Nf3 and disprotecting the g4-pawn. 16. Nf3 Qe8 with a very weird position. Safer might be 15...f6, and Stockfisk is giving me between +0.34 and +0.46, but to me this seems not so simple.

I have the games Arencibia-Panjwani 2013 and Suárez-Fernández 2015 from the ChessPublishing section for March, but 10. d5 e5 11. g4 is not in the file.

Addition: Stockfish even gives the weirder 14...Nc6!? 15. dxc6 Bxc6 16. Qc2 Rfe8 (helps that 11...Bd7 instead of 11...Bc8 here) 17. Ne2 Bxe4 18. Bxe4 Qxe4 19. Qxe4 Rxe4 20. Rd1 d5 21. cxg5 Rxg4 22. f3 Rb4 23. d6 Rb5, between 0.00 at depth=30, and it seems okay I think.


After 9 b3 Bf5 10 d5, I think Black does best to avoid 10...e5 and instead play 10...e6. Then 11 dxe6 Bxe6 seems OK for Black, who has good development and can probably soon play ...d5.

More critical is 11 g4, but then the forcing line 11...Bc3+ 12 Rxc3 Be4 13 f3 Bxd5 14 cxd5 Nxd5 offers Black good practical chances, if not an objectibve advantage, as in 0-1 (68) Adair,J (2205)-Tymrakiewicz,R (2301) Canterbury 2010.
  
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #25 - 01/01/16 at 14:03:07
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Kam wrote on 01/01/16 at 00:53:48:


Thanks Kam!

One of the ideas behind 9...Bf5 is to vacate the c8 square for the b6-knight, from where it can go to e7, with much better black coordination than in the main line 9...e5 10 dxe5 dxe5 11 Qxd8 Rxd8 12 c5 Nd7.

However, in the specific line played in your game, 9...Bf5 10 Nf3 e5 11 dxe5 (?!) dxe5 12 Qxd8 Rxd8 13. c5, the move 13...e4! as in your game seems a significant improvement on 13...Nc8?! 14 Bc4!, as played in ½-½ (32) Stewart,J (2151)-Adams,P (2072) 4NCL 2013, when Black has to struggle to equalise.

However, in the line 9...Bf5 10 Be2 (recommmended in various sources) 10...e5!? 11 dxe5 dxe5 12 Qxd8 Rxd8 13 c5, 13...Nc8 seems much better than 13...Nd7.
« Last Edit: 01/01/16 at 21:12:29 by Paddy »  
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #24 - 01/01/16 at 00:53:48
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #23 - 03/07/15 at 00:04:08
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I have the Lakdawala book which gives 9. b3 Bf5 10. d5, then after 10...e5 11. g4 Bc8 12. h4 and following up to me which sees out like a Sæmisch style plan on the kingside by White by pushing the g and h pawns.

What suggest you after 11. g4? I think that 11...Bd7 sees out interesting. Then sack the pawn with 12. h4 e4!? 13. Nxe4 Qe7 14. Bd3 Na6 15. Bg5 Qe5!? trying to induce Nf3 and disprotecting the g4-pawn. 16. Nf3 Qe8 with a very weird position. Safer might be 15...f6, and Stockfisk is giving me between +0.34 and +0.46, but to me this seems not so simple.

I have the games Arencibia-Panjwani 2013 and Suárez-Fernández 2015 from the ChessPublishing section for March, but 10. d5 e5 11. g4 is not in the file.

Addition: Stockfish even gives the weirder 14...Nc6!? 15. dxc6 Bxc6 16. Qc2 Rfe8 (helps that 11...Bd7 instead of 11...Bc8 here) 17. Ne2 Bxe4 18. Bxe4 Qxe4 19. Qxe4 Rxe4 20. Rd1 d5 21. cxg5 Rxg4 22. f3 Rb4 23. d6 Rb5, between 0.00 at depth=30, and it seems okay I think.
« Last Edit: 03/07/15 at 01:06:26 by DenVerdsligeRejsende »  
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #22 - 03/05/15 at 06:13:19
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Paddy wrote on 03/04/15 at 11:49:36:
Neil McDonald has annotated a game featuring 9...Bf5 in his February update: Suarez Uriel,A-Fernandez Garcia,M, TCh-Madrid 2014-15, 2015.


I was curious to see this game, so went looking for it. I was rather surprised to see that, according to TWIC (2015 issues), black has scored 4.5/5 with 9...Bf5 recently.
  
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #21 - 03/04/15 at 11:49:36
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Neil McDonald has annotated a game featuring 9...Bf5 in his February update: Suarez Uriel,A-Fernandez Garcia,M, TCh-Madrid 2014-15, 2015.
(Note that the player with Black is NOT the well-known Alekhine's expert Jose Luis Fernandez Garcia.)
Neil's notes are good but show no awareness of this thread (although otherwise well-researched I should say - thanks Neil!).
  
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #20 - 10/17/14 at 12:52:28
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After 23. Qe4, the move 23…. Kf8!? is much better than the wrongly advocated 23…. Bf6. As shown in a future discussion, black can get  very reasonable play by getting the knight to “d4” and possibly launching of the black f-pawn to “f5”.
  
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #19 - 10/12/14 at 23:04:16
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Checking my file, my analysis had stopped after 21...Rxd5 22. Qxd5 Nc6 with a plus for White. Such a plus does not mean that White wins. All I say is there is a significant advantage for White. Maybe you should rather look for something better, before you risk to play this position. Smiley

By the way, 21...Qe6 may be an alternative.
  
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #18 - 10/12/14 at 13:28:47
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Kam: many thanks for your continued efforts to provide analytical support to the 9...Bf5.

Unfortunately I get an error message when I try to download the pgn file.
  
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #17 - 10/10/14 at 14:26:43
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #16 - 08/04/14 at 08:44:27
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Kam wrote on 08/03/14 at 03:24:47:
The second part of this investigation looks at the critical continuation 10.Be2 e5 11.Nf3 Re8!?

Kam, after 12.dxe5 dxe5 your side-line 13.Ng5 Qe7 (or 13...h6 14.g4) 14.g4 Bd7 15.0-0 Bc6 seems good for White. Instead of 16.Nd5? (your analysis) White has the strong 16.b4! hoping for 16...Qxb4? 17. c5 N6d7 18.Nxf7! Kxf7 19.a3 Qa5 20.Bc4+ and White wins. So Black has to avoid 16...Qxb4, but it still looks excellent for White (+0.80 says the engine).
  
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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #15 - 08/03/14 at 03:24:47
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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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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #14 - 07/03/14 at 16:18:48
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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 19:38:42
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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 22:58:38
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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 12:59:13
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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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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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* * * * * * * *
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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.

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


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.

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


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.

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


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.

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


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.

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

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.

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


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.

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


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.


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


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.

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


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.

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


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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* * * * * * * *
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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.

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


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 21:14:41:
Phil Adams wrote on 07/30/10 at 15:58:03:
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 02:24:08
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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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Re: Alekine's Defence, Voronezh 9...Bf5 New Ideas?
Reply #3 - 04/17/10 at 14:12:43
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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 15:11:32
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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 10:54:46
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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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Alekine's Defence, Voronezh 9...Bf5 New Ideas?
04/15/10 at 07:00:50
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Alekine’s Defence, Voronezh Variation,  9… Bf5  10.Nf3 e5!?
Outmanoeuvering of a Slow Build Up System?

     The Alekine’s Defence Voronezh Variation 9…. Bf5 system has been
considered a side line to the main line 9…. e5 system. The most popular continuation
after 9…. Bf5 is 10.Nf3 Bg4 11. Be2 e6  13.O-O d5 13.c5 Nc8  etc and white seems
to get slight advantage and black’s counter attacking options are limited.
     The continuation 10.Nf3 e5!? personally looks very appealing to me and  I
currently have found no convincing refutation.
     The following game is fictitious I have made some comments.

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
  Black attempts to disrupt the white
slow build up approach.  Diagram 1. 
 
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[10...Na6 was previously studied, but white can control the game by playing a3
and leaving the d pawn at d4 to prevent Nc5. After king side castling, the black
bishop becomes a liability at f5 due to h3 followed by g4. 11.a3 e5 12.Be2 Qe7
13.0–0 Rfd8 14.Re1 Rac8 15.h3± Black is running out of useful moves
and black is virtually committed to an under prepared pawn advance, with
no support from the peripherally placed knights. 15...e4 16.Nd2 d5 17.cxd5 Nxd5
18.Nxd5 Rxd5 19.Rxc8+ Bxc8 20.Qc2 Bf5 21.g4±] The black bishop must retreat
and the important black central pawn will fall.
Diagram 2.

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11.dxe5 White’s previous move has been chosen, because it closely
parallels the themes relating to the well known 9.... e5 system. There are two
other important 11th move alternatives. a) 11.d5 is perhaps the critical
move and black should respond with 11.... Na6!? 12.Be2 Nc5  13.O-O Ne4! 
14.Nxe4 Bxe4  15.Ng5 Bf5 ±/=  This line may be discussed at a later date.
White can also play the interesting  b) 11.c5, followed by 11… e4  12.cxb6 exf3
13.Qxf3 Nc6  Black has adequate counterplay and the black rooks will certainly
benefit from the the opening of the “a” and “e” files. Diagram 3.

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14.bxa7 Bd4  15.Bxd4 Nxd4  16.Qf4 Re8+ 17.Kd1 Ne6 =/ Ŧ 11...dxe5 12.Qxd8
12. c5 is another important alternative and a possible is continuation 12.... N6d7
13.Bd3 Nc6  14.O-O Nf6  15. Bxf5 gxf5 16. Qc2 e4! 
17.Rfd1 Qb8∞ This fascinating variation may also be discussed at a later date!
12...Rxd8 13.c5 e4! Diagram 4.

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Black ignores the threat and indeed, the white king is at risk of being trapped in
the centre in an open position. The bishop at f5 is an important contributor to
the black counter offensive, since it protects the counter attacking centre pawn.
(13...N6d7  Perhaps not as good as the recommended 13....e4, but it seems to be playable.)
14.cxb6 a)14.Ng5 Bxc3+ 15.Rxc3 Nd5 16.Rc4 Nc6 17.Nxe4? (17.Be2 Ne5
18.Rd4 Rac8 19.Bd2 Rxc5 20.Nxe4 Bxe4 21.Rxe4 Rc2 22.Rxe5 Nc3 23.Bf3 Rdxd2
24.0–0 Rxa2 25.Bxb7 Ne2+ 26.Kh1 Nd4=/Ŧ) 17...Bxe4 18.Rxe4 Nc3 –+;

b) 14.Nd2 Bxc3 15.Rxc3 Nd5 16.Rc4 Nc6 17.Be2 Ne5 18.Rd4 Nd3+ 19.Bxd3 exd3
20.Nc4 b6 21.g4 Be6 22.g5 Nxe3 23.Rxd8+ Rxd8 24.Nxe3 bxc5 25.Kd2 Rd4
26.f3 Kg7 27.Rf1 a5 White is a pawn down and will be struggling to save the game.

14...exf3 15.bxa7 Nc6 16.Nb5 Nd4 17.Nxd4 Bxd4 18.gxf3 Rxa7 The black
pieces dominate the board and it is a bit surprising that white is able to hang on.
Diagram 5.

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19.a4 Be6 20.Bc4 Bxe3 21.fxe3 Bxc4 22.Rxc4 b5 The march of the white
queen side pawns come to a grinding halt. Diagram 6.

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23.Rb4 bxa4 24.bxa4 The white “a” pawn is lost and the material balance
can be restored. 24...Rc7 (if Black wants to desperately win) or 24… Rda8=
     I certainly welcome any interesting comments. At least in this game, the
Voronezh variation did look a bit sluggish against black’s quick development approach.
     A key to the understanding of this system is that the advance of the white
c pawn to c5 can be played as early as move 11 or as late as move 13 or not at all.
In many cases, black can respond by playing e4, but at least in one case, the reply
is N6d7.
         Chess theoreticians may have neglected the 9….Bf5 10. Nf3 e5 continuation
because somewhere in the sea of complications, there may be a refutation.
My belief is that while there is a white king waiting to be trapped in the
centre, there is no refutation, but an ocean of rich tactics and ideas.  Kam Lee

  
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