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Hot Topic (More than 10 Replies) Voronezh Variation  9.... e5   Loads of Action! (Read 20361 times)
Kam
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Some Corrections and Response to 26. Bd2 Ne5  27. Ba5!
Reply #4 - 06/01/09 at 14:43:45
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To Craig,

Apologies for the typo error.  After variation b)  23.Rfd1 Ne5,  Black actually played 24. Nxb7 (and not 24. Bc3)

The line 25.Nd6 f4 26.Bd2 Ne5, 27.Ba5! was overlooked. I will look at
it at some time.

I have written a letter to Willempie about whether it is possible to fix up errors (which includes wrong coloured pawns!) on previous posts.

From Kam.
  
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CraigEvans
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Re: Voronezh Variation  9.... e5   Loads of Action!
Reply #3 - 05/31/09 at 19:55:37
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Some fair questions.. hopefully I can supply some answers.

Bizarrely, I hadn't even considered 25.Rfd1, for some reason the c-rook just seemed the natural one to me. Anyway, in some of the lines that I briefly looked at, the Rf1 comes to e1 to pressure the e-pawn and either threaten to win it or to stop ...e3 thrusts.

After 25.Rcd1 f4 this idea is hopefully illustrated - 26.Bxf4!? is my idea, with 26...gxf4 27.Nxf4 Ne5 28.Nd6 to follow. White has three pawns for a piece, the e-pawn is also weak now, black's pieces do not seem terribly coordinated to me. I might be missing something, and perhaps black is still fine, but the position looks rather prospectless to me, expectially if white can get the queenside pawns rolling. Rybka, for example, gives the bizarre 28...Bh8 as best for black and +1 nonetheless - the idea apparently is to meet 29.Rfe1 with Rg7!? but then 30.Nxe4 is still fine for white.

I'm sure the piece sac is not to everyone's taste, and with the two bishops black should be able to play it, but this looks a bit nastier for black to me.

Looking at Kam's line after 25.Nd6 f4 26.Bd2 Ne5, 27.Ba5! looks like an improvement also, allowing white to recapture on c4 with the rook after 27...Nxc4 28.Rxc4 Be6 29.Rb4 and black is in the game, but white is not worse by any means.

There might well be a lot to be discovered here, but 22...Bd7 is certainly an interesting try (although 21...Rb8 wasn't discredited from the last I remember) and I look forward to analysing it deeper.
  
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Re: Voronezh Variation  9.... e5   Loads of Action!
Reply #2 - 05/31/09 at 19:21:43
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Craig

After 23.Nxb7 h6 24.Nh3 g5 why not 25 Rfd1 instead of 25. Rcd1
(moving the f rook allows the other rook to control the c file".
Anyway, after 25. Rf(c)d1 what is your main line after 25. ...f4
?
  
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CraigEvans
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Re: Voronezh Variation  9.... e5   Loads of Action!
Reply #1 - 05/31/09 at 18:28:43
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Kam, I haven't had a chance to double-check everything, but a few points:

1) In your line with 23.Rfd1 Ne5, what is white's 24th move? Bc3 doesn't look too possible to me...
2) In one or two of your diagrams I think you've got black pawns on the k-side where white ones should be!
3) In the main line with 23.Nxb7 (which is where I will be directing my attention in the main), after 23...h6 24.Nh3 g5, 25.Rcd1! seems to be a pretty large improvement.

a) 25...Ne5 looks like the obvious move, but that allows the fearful 26.c6! and white is going to come out on top - those bishops become activated pretty quickly.
b) 25....Rc8 looks better, but after 26.Nd6 Rc7 27.Nb5! Rc8 I can't believe that white is okay - I'm not sure whether 28.Rxd7 works, although it would be my first suggestion, but if not then I'm sure something like 28.Nd4 should still be okay for white.

I'll check the rest of your analysis later, but I'd be interested in your opinion after 25.Rcd1, as this seems to be a more relevant move than immediately dropping the knight back.
  
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Kam
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Voronezh Variation  9.... e5   Loads of Action!
05/31/09 at 13:13:37
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IMPROVEMENT FOUND IN THE VORONEZH LINE    9.... e5 INVOLVING 21….e4.

An entertaining hypothetical game and the pawn storm theme will be used as the central theme to the analysis. Pawn storms can be classified into various stages of progress being a) early,  b) moderate and c) advanced. Such jargon will be incorporated into the discussion.

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 e5  10. dxe5  dxe5  11. Qxd8 Rxd8  12. c5  N6d7  13. Bc4 Nc6 14. Nf3  Na5  
15. Bb5 Nc6  16. Ne4   f5!  17. Bc4+ Kf8  18. Neg5 Nf6  19. Nf7 Re8  20. Nd6 Re7
21. O-O  



Ig, Markovic and Graig Evans have investigated 21…. f5, but white was able to gain the initiative by 22. Bd2 Bg4  23.Bc3! Bxf3 24. gxf3 Nd4  25. Kg2 Ne8  26.Rfe1 Nxd6  27. cxd6 Rd7  28. Bxd4 exd4  29. Bb5 Rxd6  30. Rc7± (Craig Evans)

21.... e4  22. Ng5 Bd7! The natural 22…. Ne5
has been investigated by Ig and Craig Evans, but a clever refutation was found ie.
22. Ng5 Ne5?!  23. c6! Nxc4  24. Rxc4 b6  25.Rd1 h6  26. Nh3 g5   27. Bc1!  



27…Ba6     28. Ba3 Bxc4  29. Nxc4 Kf7  (29…. Rc8  30. Nd6 Rxc6  31. Nxf5 Rc5 32. Nxe7 Kxe7  33. Rd4 +-  Black has an inferior pawn structure and is about to lose the exchange) 30. Bxe7 Kxe7  31. Nd6 Ne8 32. Nxf5+ Kf6  33. Ng3± (Black is a pawn down and has no compensation)
     It would have taken tens of hours of intensive thought to find this important refutation. Commiserations to the abandoning of the 22 …Ne5 line.


The playing of 22… Bd7! seems to put the  21…. e4 line back into the game, and the reason for its effectiveness is the following.

a) 22… Ne5 was bad because, white was now able to play 23. c6!, which allows the
activation of the bishops. The playing of 22… Bd7 means that the knight is still at
c6 and thus white’s c pawn cannot be advanced.

b) White’s dark square bishop must be kept asleep for as long as possible.

c) Development of the black queen bishop allows development of queen rook.
d) The pawn at b7 does look weak, but black is able to seize a positional
   advantage from a pawn sacrifice.
     Positions arising from the sacrifice, 23. h4 and the critical 24 Bf4! will be investigated.



     22…. Bd7!


23. Nxb7 White accepts the offer of a pawn, but white has two other interesting alternatives:

a) 23. h4 White decides to ignore the sacrifice and confront the pawn storm at the early stage of development, but the h pawn can also become a target. 23…Ne5  24. Rfd1(Bf4!  Perhaps white’s most critical line in this variation Nxc4  25.Nxc4 Kg8 26.Bd6 Ree8  27. Rfd1 Bb5! = Source of another interesting game!)




24…Nxc4  25. Rxc4 Bc6  26.b4 Rd8  27. Bd4 a6  28.h5 h6 29. Nh3 Nxh5  30. Nxf5 Red7  31. Bxg7+ Nxg7  32. Rxd7 Rxd7  33. Nxh6 Rd2 34.Ng5 e3! Ŧ)





b) 23. Rfd1 Ne5  24. Bc3 Nxc4 25.bxc4 h6 26.Nh3 g5 27.Nd6 f4 28.Bd4 Rd8 29.Re1 Bc6 30.Rcd1 Ng4 31.Nf5





31.... Bxd4 32.Rxd4 Red7 33.Rd6 Rxd6 34.cxd6 Ne5 35.c5 Nd3 36.Rb1 g4 37.Nxf4 Nxf4 38.Nd4 Rc8 39.Nxc6 Rxc6 40.Rb8+ Kf7 41.d7 Rxc5 42.h4 Ne6 An extremely bizzare game! –0.31;

23… h6  24. Nh3 g5  25. Nd6  (White can also choose to blockade the pawn storm at the moderate stage of development. 25. g3 ! f4  26. Nxf4 gxf4  27. Bxf4 Ne5  28.Nd6 Bh3  29. Rfd1 Bg4  30.Rf1 Nxc4 31. Nxc4 Re6  32. Bd6+ Kg8  33. b4 Rd8  34. a4 Ne8 = )






25….f4  (26. Nxf4 gxf4  27. Bxf4 Nb4  28. Bd2 Rb8 29.Rfe1 a5  30. a3 Nd3  31.Bxd3 exd3  32. Rxe7 Kxe7  33. Rc3 Ne4 34 Ne4 Bxc3Ŧ) 26. Bd2 Ne5  27. Bc3 Nxc4  28. Nxc4 Nd5  29. Bxg7+ Kxg7  30. Nd6 Rf8  31. Rfd1 Bc6  32. g4 e3  33. Rd4 Re5  34. b4 a6Ŧ



35.a3 (A more active alternative results in the same fate 35.Nf5+ Kg6 36.fxe3 fxe3 37.Rf1 Rb8



38.Re1 Rxb4 39.Rxb4 Nxb4 40.Rxe3 Rxe3 41.Nxe3 Nxa2 42.Nf2 Nb4 43.Kf1 a5 44.Ke1 Kf6 45.Nf5 Na6 46.Nd4 Bd5 47.c6 Ke5 48.Nf5 Bxc6 Black is winning.) 35...e2 36.Re1 f3 The advanced stage of the pawn storm has come and white is in trouble. 37.Nc4 Re6 38.Na5 Nf6 39.Nc4 Re4 40.Rxe4 Nxe4 41.Kh1 h5 42.gxh5 g4



43.Nd6 gxh3 44.b5 Nxf2+ 45.Kg1 Nd3 46.Ne8+ Kh6 47.Rf1 f2+ –+ An example, which shows that white can also be terrorized by a pawn storm in the Voronezh Variation!

     My current assessment of this line is that the line involving 21…e4 is playable at least if white continues with 22. Ng5. Does white have any other threatening alternatives?
  
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