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a theoretical game in the Sveshnikov 
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Knight

Joined: Mon Oct 27, 2008 12:52 pm
Posts: 40
Rating Class: Class B (1600-1800)
 a theoretical game in the Sveshnikov
[Event "The Sicilian Series - The Sveshnikov - Round 1"]
[Site "Chess.com"]
[Date "2012.04.28"]
[White "xitvono"]
[Black "plutonia"]
[Result "1-0"]
[WhiteElo "1988"]
[BlackElo "1659"]
[TimeControl "1 in 1 day"]
[Termination "xitvono won on time"]

1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Ndb5 d6 7.Bg5 a6 8.Na3 b5 {Thematic Game - This is the starting position.}
9.Bxf6 gxf6 10.Nd5 f5
11.Bd3 Be6 12.O-O Bxd5 13.exd5 Ne7 14.c3 Bg7 15.Qh5 e4 16.Bc2 Qc8 17.Rae1 O-O 18.Kh1 Ng6 19.Bb1 Re8 20.f3 b4
21.cxb4 Bxb2 22.fxe4 Bxa3 23.Re3 Bxb4 24.Rh3 Nf8 25.Rg3+ Ng6 26.exf5 Re5 27.Qh6 Qc4 28.Bd3 1-0

The move 23. Re3 was a database suggestion with a vaule of 0.00, so perhaps that means the computer believes it is a forced draw, or else it is just an equal position. In the actual game black got into trouble. I believe in the final position white is winning because if the queen moves, then white plans pxn and the threat of double check is serious, but pxp Bxp renews a double check threat and if pxB then Rxg6 is mate. What does theory say about the position after Re3?


Wed May 09, 2012 7:12 pm
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 Re: a theoretical game in the Sveshnikov
It looks like Re3 is winning for white to me. You could check the lines with a computer.

Just an example line - 23...Bc1 24.Rh3 h6 25.exf5 Ne5 26.Rg3+ Kf8 27.f6 Qc4 28.Rg1 and I don't see any defense for black.

Lines like this are why the Sveshnikov has fallen out of favor at the top. I don't think you'll really see 18...Ng6 either, Leko's move Rb8 is generally accepted to be better than alternatives (18...b4, 18...Nxd5?, etc.).


Wed May 09, 2012 10:31 pm
King
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 Re: a theoretical game in the Sveshnikov
I cannot see a clear white win in your variation. :?:
28. ... Reb8 or Rec8 is forced, but how does white continue? After 29. Bh7 Ke8 there is no mate ...
if black gets the chance to develop his rooks he will win. White still has some pressure, but is that really full compensation? I am not sure.

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Sat May 12, 2012 1:13 am
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 Re: a theoretical game in the Sveshnikov
zeitnotakrobat wrote:
I cannot see a clear white win in your variation. :?:
28. ... Reb8 or Rec8 is forced, but how does white continue? After 29. Bh7 Ke8 there is no mate ...
if black gets the chance to develop his rooks he will win. White still has some pressure, but is that really full compensation? I am not sure.


After 28...Rec8 29.Qh3! wins. Black's king is cut off and black is forced to give the queen for the rook after 29...Qf4 30.Bh7

Other defenses also fail - for example 29...Rc7 with the idea of playing Ng6 and defending along the 7th loses to 30.Rg7! Ng6 31.Qg3! and now black's f pawn is pinned to the rook so the knight is loose (Qf4 would drop a piece).


Sat May 12, 2012 5:57 pm
King
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Rating Class: National Master
 Re: a theoretical game in the Sveshnikov
About 28...Rec8 you are right, it's lost. I concentrated on Reb8 and thought there is no big difference.

First time I looked at the position with Stockfish, we found no advantage for white.
Second time resulted in Black having a clear advantage due to the possible counterplay with Rxb4 in conjunction with Ng4.
When I tried a3 to avoid Rxb4 the evaluation function of my engine got crazy. After 20s of calculation time it gave +1 to +2 for the side to move for several moves long...

When I looked at the position again, finally the convincing line:
28. ... Reb8 29.Bh7 Ke8 30.Bd3!! Qf4 31.Re1 Kd8 32.Qd1 Qd2 33.Rg8+ Kc7 34.Qxc1+ Qxc1 35.Rxc1+ Kb6 36.Rxb8+ Rxb8 37.Be2 where white is winning
was given immediately and this is also found directly by all my other engines. I didn't find an improvement for black.
So, I am a bit confused about my computer and my engines ...

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Sun May 13, 2012 3:28 am
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