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17. Rd3
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Another exclam, as now Black is prevented from exchanging a set of rooks with ...Rd8. The point is that 17...Rd8 is met with 18. Qc5! Qxc5 19. Rxd8 Qf8 20. Rxf8 and 21. Rc7 and the pawns on the second rank will be massacred by the White rook. If White had hesitated with a natural move like 17. e4, Black can ease his task by 17...Rd8, as 18. Qc5?? is met by Rxd1 losing the Queen. |

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17... Nd5 18. e4
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The White bishop is now locked in, however, chess is a game of give and take. The Knight on d5 blocks White's pressure down the d-file and guards against a Rook invasion on c7. Overall, the White pieces are doing fine with this move. |

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18... Nb6
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18...Nf6 19. Rc7! |

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19. Bf1
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There are no blazing tactics here, so Kasparov reasons that since Black isn't able to do anything constructive, he will slowly improve all of his pieces. |

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19... Re8 20. Rdd1
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Clears the way for the Bishop and is safer on d1. |

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20... Rf8
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Black has no other choice but to wait for White to attack. |

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21. a3
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Black will not be able to cope with the advance of the Queenside pawns. Once Kasparov gets a pawn to a5, forcing the knight back, Black's defences will crumble. |

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21... Kg7 22. b3 Kg8
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Black has no moves on the Queenside that don't lose a piece. On the Kingside, the Rook and the King can continue to shuffle back and forth, and the Queen can move, but once she does the Rook hits c7. |

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23. a4 Rd8
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Black tries an active move, but is instantly punished. |

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24. Qc5
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And here Petrosian resigns in the face of 24...Qxc5 25. Rxd8 Qf8 26. Rxf8 Kxf8 27. Rc7 when Black is menaced with a5 winning the Knight, and the Kingside pawn structure will collapse after 28. Rxf7.
A positional brilliancy by Kasparov. |
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