Ock

As usual Black must begin active operations on the queenside in order to distract White's attention from the other flank With his last move Black threatens to cause White problems by continuing with a4-a3 or by a well-timed exchange on b3 Polugayevsky-Planmc, Skopje 1971. followed another path when Black decided to open the d-

file with 10 dxe4 This worked to White's advantage 11 dxe4 £sa6 iVukic-Miles, Novi Sad 1975, con-unued 11 £>bd7 12 We2 Wc7 13 e5 £)d5 14 £ie4 2fd8, when 15 a3 followed by 2fdl would have favoured White) 12 We2 £>c5 13 &e5 #C7 14 ihl fiadS 15 f4 -£>e8 16 Hadl £id6 17 Ve3' £la6 (17 £>d7 18 £id3 and 17 £ic8 18 #c3> are both bad for Black) 18 a3 (White would also be better after 18 <Sb5 19b4c5 20 c4£id4 21 b5 £>b8) 19 g4' and Black is in danger of being over-run 11 a4

This is usually the best reaction to a7-a5, as 11 a3 invites a future a5-a4 which could turn out well lor Black

11 ... £ia6 Again Black aims to pressure his opponent's queenside with ®a6-b4 Korchnoi-Reshevsky, Amsterdam (maich) 1968, saw instead 11 £Jbd7 12»e2 »b6 13e5 fte8 14 ih3' with a slight advantage to White After 14 £lc7 15 &hl 2ae8 16 £)h4 f6 17 exf6 Axf6 18 Axf6 2xf6 Black had succeeded in eliminating White's powerful e-pawn, but 19 f4 #c5 20 £klf3 still left White better thanks to his renewed control of the e5 -square Bringing the other knight to d7 with 11 £sfd7 leads to Vukic-Buljovcic, below

12 2

A similar position would arise after 12 e5 £id7 13 #e2 &b4 14 In the game Vladimirov-Kharitonov, USSR 1977, White developed a kingside attack after 14 Wb6 15 ¿hi Wa6 16 f4 2fe8 17 20 c5 18 g4 12 ... £)b4

12 ftc701 was seen in Dannevig-Gretarsson Gausdal 1994 I don't really see the point of putting the knight here, and indeed in the game Black failed to make an impact after 13 £)e5 £b4 14 fiadl #e7 15 &hl 2ad8 when both players 'wasted' a move — 16 £>bl 17 f4 Now Black sought to avoid being on the wrong side of a kingside attack by exchanging some heavy pieces 17 dxe4 18 dxe4 2xdl 19 2xdl 2d8 20 Sxd8+ Wxd8 (D)

However, hopes of a draw were soon dashed 21 5ld3 Ae7 22 5kl2 £kl7 23 £)c4 Af6*> (23 ftab4 gives the knight something to do at last, after which Black is cramped — the light-squared bishop is locked out — but reasonably solid) 24 Hfd2' Axb2 25 £)dxb2 Suddenly Black is about to part with a valuable pawn 25 b6 (25 £ib4 26 £>xa5) 26 £ixb6 »xb6 27 »xd7 ig6 28 £ic4 *f2 29 #d2 lfxd2 30 &xd2 &b4 31 ftc4 ftxc2 32 £ixa5 and White went on to convert the pawn 13 £)el iM7

In Quinteros-Spindonov, Cienfue-gos 1972, Black unwisely underestimated White's kingside attacking chances The game went 13 Ift^' 14 *hl 2fd8 15 e5' £id7 16 f4 «a6 17 g4' 2e8 18 #f2 Af8 19 Wg3 c5 20 f5, and Black was in trouble Also possible is 13 dxe4, although this gives White use of c4 for his queen's knight Addison's move is designed to lure the white e-pawn forward whence it will be challenged with f7-f6

14 f4 Af6

15 e5 Ae 7

16 g4

With his queenside under no immediate pressure White may now go on the offensive

Tucking the king safely in the corner is always a good idea in positions of this nature

Perhaps this is a natural reaction when faced with a potential pawn storm, although counter-attacking on the queenside was called for Gligoric has recommended 17 b5, while Kotov preferred 17 c5 followed by Wc7 (to defend the fa-pawn ), d5-d4 and 4jb4-d5 In both cases White has the better practical chances since he is attacking the king An important feature of the KJA which the reader should bear in mind is that positions arise tiequently which have White attacking on the kingside and Black on the queenside Not surprisingly, therefore, this makes White's task easier as inaccurate defence on Black's part will have more serious consequences

Returning to the diagram position we see that play revolves — as is often the case — around the e5-square White's firm grip accentuates his advantage

18 fxe5

19 ^ixeS axe5

20 Axe5 c5

21 Sdl

A prophylactic measure designed to give Black second thoughts about pushing with c5-c4 (which could have been the answer to 21 af3) to open up the queen's bishop's h7-bl diagonal

22 af3 axe5

23 axe5

It is generally indicative that things have gone well tor White when he has a host of pieces ready to occupy the e5-square

24 Ve3!

Preparing to continue his kingside attack with 25 g5

25 Sdel Zre

26 h4! Ah8

27 *g3 Ka6

Indirectly defending the e-pawn

28 g5 Eb6

Exchanging with 29 Axe5 30

2xe5 #f7 would have at least relieved some ot the pressure which White has built up Now Polu-gayevsky cleverly tums his initiative and positional advantage into a won game

30 gxh6 gxh6

31 ag6+ Axg6

K1A Black plays d5 and A/5 ¡33

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