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Monday, April 30, 2012

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 Prasad - Koshy,Varugeese [B33]
Madras, 1995
1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Ndb5 d6 7.Bg5 a6 8.Na3 Be6

[This is the main alternative to Sveshnikov's 8...b5 and probably the really playable alternative. Other moves seem rather dubious, for example: 8...Be7 9.Nc4 Nd4 (9...Be6 10.Bxf6 gxf6 11.Ne3 Qd7 12.Ncd5 Bd8 13.Qh5 gave White a typical light-squared bind in the game Blue-Plater, Hilversum 1947; while 9...0–0 10.Bxf6 Bxf6 11.Qxd6 Be6 12.0–0–0 Bg5+ 13.Kb1 Qf6 14.Qc5 left Black with inadequate compensation for his pawn in Estrin-Goldenov, USSR 1956) 10.Bxf6 Bxf6 11.Nd5 b5 12.Ndb6 Rb8 13.Nxc8 Rxc8 14.c3 Ne6 15.a4!± gave White a clear advantage in Averbakh-Korchnoi, USSR Ch. 1950.; 8...d5 is well met by 9.Nxd5 Bxa3 10.bxa3 Qa5+ 11.Qd2 (11.Bd2 is also possible) 11...Qxd2+ 12.Kxd2 Nxd5 13.exd5 Nd4 14.Bd3 with an extra pawn and the two bishops.] 9.Nc4 Rc8 10.Bxf6 gxf6

 [Black can avoid weakening his pawn structure with 10...Qxf6 but this loses time. White can keep an edge with 11.Nb6! (and not 11.Nxd6+ Bxd6 12.Qxd6 Rd8 13.Qc5 Nd4 14.Bd3 Qg5„ with excellent counterplay) 11...Rb8 12.Ncd5 Qd8 13.c3 Tolnai-Honos, Hungarian Team Ch. 1995 continued 13...Be7 14.g3 0–0 15.Bg2 Qe8 16.0–0 Kh8 17.a4 Bd8 18.b4 Ne7 19.a5 Qc6 20.Rc1± with a clear edge.] 11.Ne3 Bh6 [By exchanging off the knight on e3, Black rids himself of his bad bishop and weakens White's control of the d5- and f5-squares. Even so, it does not seem quite enough equalise. An alternative is 11...Ne7 , after which Anand-Morovic, Las Palmas 1993 continued 12.Bd3 Bh6 13.0–0 Bxe3 14.fxe3 Qb6 15.Qc1 Ng8! 16.Kh1 Now Mrovic suggested 16...h5!? (in the game he stood worse 16...Qc5 17.Qd2 h5 18.Rad1 h4 19.h3 Kf8 20.Qe2) after which 17.Nd5 is well met by (In my view should keep the tension with 17.Rb1!? ; or 17.a3 , when the defects in Black's position remain.) 17...Bxd5 18.exd5 Ne7 19.e4 f5! with for both sides.] 12.Bd3 Bxe3 [Black can transpose into the note to Black's 11th with 12...Ne7 ] 13.fxe3 Qb6 14.Qc1 Na5?! [A natural move, going for counterplay on the c-file, but White's play on the f-file may prove more effective. Black can still transpose into the note to his 11th with 14...¤e7. Another way to defend the f6-pawn is with 14...h5 15.0–0 Rh6 , but this still seems better for White after 16.Kh1 Ne7 17.a3 h4 Oll-Sermek, Moscow Olympiad 1994 and now 18.h3! leaves Black struggling.] 15.0–0 Ke7 16.Qe1 h5

 [16...Nc4 17.Nd1 would transpose back into the game but this may represent a more accurate move order from Black's point of view as it avoids the pofential perils of 16...h5 17.b3.] 17.Nd1 [17.b3 was played in a game Ki.Georgiev-Shirov, Biel 1992 when Karpov suggested that Black had to play 17...Rxc3! (the game resulted in a quick defeat for Black after 17...Qc5 18.Nd5+ Bxd5 19.exd5 Qxd5 20.Rd1 Rcg8 21.Qf2 Rh6 22.Bg6!! 1–0) 18.Qxc3 Qxe3+ 19.Kh1 Nc6 20.Rae1 Qc5 21.Qd2 (21.Qxc5 dxc5 leaves Black with good compensation for the exchange because the bad bishop on d3) 21...Nb8! 22.Rf3 Nd7 , when it is very difficult for to make progress.] 17...Nc4?! [Going for active counterplay but the knight ends up the poor a3-square. Maybe 17...Qc7 is worth a thought, intending to bring the knight back via c6 to b8 and then out again to d7. That f6-pawn needs protecting.] 18.b3 Na3 19.c4 Qc5 20.Nc3 b5 21.Nd5+ Bxd5 22.cxd5 Qc3 [After 22...Nc2 there follows 23.Bxc2 Qxc2 24.Qh4 Rh6 25.Rxf6 etc.] 23.Qh4 Rh6 24.Rxf6 Rxf6 25.Rf1 Rf8 26.Qxf6+ Kd7 27.Rd1 Qb2 28.h4!

A very deep move, setting up an evelual endgame win based on the poor position of Black's knight. 28...a5 29.Qf1 Ke7 30.Rc1 Qd2 31.Rc7+ Kd8 32.Qc1! Qxc1+ 33.Rxc1 Kd7 34.Rc6 Rc8 35.Rxc8 Kxc8 36.g4 Kd7 37.gxh5 Ke7 38.Kg2 .An elegant game by Prasad. 1–0