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Sunday, May 6, 2012

Semi-Slav Botvinik Variation.

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Semi-Slav : Botvinnik System

1.    d4             d5

2.    c4

A Queen;s Gambit. White has clear intention of exchanging the Black's central pawn with non-central pawn.In this case the further game will be played with White's two central pawn versus Black's single central pawn.


2     --- c6

3.    Nf3           Nf5

4.    Nc3          e6
This is Semi Slav, One of the Rubinstein's inventions. White has not yet deveeloped his Queen's Bishop and black has to threated ---dxc4 and White can play e3 to defend the pawn but loses the chance to develop the Queens Bishop.


5.    Bg5

(An Ambitious development. The Pin along h4-d8 diagonal and tends to play e2-e3 and continue developing in a natural way, )


Now Black has options,

A)   5 ... h6                ( Moscow Variation )

B)   5 ... dxc4             ( Botvinnik System)

A1    6  Bh4                ( Anti Moscow Variation)

A2    6  Bxf4               ( Main Line )
In this post we are going to discuss the Botvinnik System.

5   --- dxc4
Glean Flear in his book Starting out Slav and Semi Slave writes, "Capturing the gambited pawn leads to great complications and is not for the fainted hearted".

Blacks Idea is to play b5 to defend the pawn and Bb7 posting the Bishop on the important long diagonal


6      e4       

He threatens not only to regain his pawn but also to play 7 e5.

6    ...b5  (Holding on to the c-pawn )

7    e5              h6

8.   Bh4            g5

9    Nxg5          hxg5

10   Bxg5          Nbd7

11   exf6
          


From Black's point of view, the f6-pawn is now best left alone, as recapturing would leave Black in a debilitating pin. Instead second player aims to complete queenside development, including castling long.

If you observe the pawn structure carefully you will find that there is large majority of pawns on one wing.

This clearly shows that there will be a pawn race in the end. .
Only White has a passed pawn for the moment, but Black can create one rather quickly with ...b4 followed ...e3 and this might turn out to be even more dangerous than White's h-pawn. 


11   ...  Bb7   12 g3   c5   13   d5

Let us discuss the three Possible Moves

A :  13 ---Qb6   ( 582 )

B :  13 ---Nxf6  ( 260 )

C : 13 ---Bh6    ( 257 )
       
[13...Nxf6 14.Bg2 Bh6 15.Bxf6 Qxf6 16.0-0 0-0-0 17.Nxb5 a6 18.Nc3 exd5 19.Re1 Kb8 20.Na4 Bf8 21.Rc1 Bc6 22.b3 Bh6 23.Rc2 Qd4 24.Qb1 Ka7 25.bxc4 Bxa4 26.Rb2 Rd6 27.Bxd5 Rxd5 28.Rb7+ Ka8 29.Qb6 1-0 Onischuk,A (2650)-

13...Bh6 14.Bxh6 Rxh6 15.Qd2 Rxf6 16.Bg2 Ne5 17.0-0 Nf3+ 18.Bxf3 Rxf3 19.Nxb5 Bxd5 20.Rfe1 Rf5 21.Rad1 Qb6 22.Nc3 Bf3 23.Ne4 Ke7 24.Rb1 Rd8 25.Qh6 Rd4 1-0 Ribli,Z (2577)-Eschbach,D (2435)/Germany 2009

14.Bg2 0–0–0 15.0–0 b4 16.Na4 Qb5 17.a3 Nb8 18.axb4 cxb4 19.Qd4 Nc6 20.Nb6+ axb6 21.dxc6 Bxc6 22.Bxc6 Qxc6 23.Qg4 Bc5 24.Ra7 Rd7 25.Rxd7 Kxd7 26.h4 Kc7 27.h5 e5 28.h6 Bd4 29.Qe2 b3 30.Be3 Qd5 31.Rd1 Kc6 32.Qg4 b5 33.Bxd4 exd4 34.Rxd4 Qe5 35.Qd7+ Kc5 36.Qa7+ Kc6 37.Qd7+ Kc5 38.Rf4 Qxb2 39.Rf5+ Kb4 40.Qxb5+ Kc3 41.Rf3+ 1–0 Carlsen,M (2810)-Smeets,J (2657)