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13. a3
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Keeping the knight out of b4. |

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13... Nd7
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Revealing a second attacker on the Nc3, while shifting his attentions to the queenside. |

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14. Bd2
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Defending the Nc3, while threatening a revealed attack on the Qa5 down the road. |

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14... Qd8
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Not sticking around for that -- although Qb6 looks to be okay as well (though the b-pawn looks totally poisonous after, say, Qb6 15. Kh1 Qxb2? 16. Rfb1!). |

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15. Rab1
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The first new move of the game. This frees the Nc3 to move! |

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15... e6
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And this prevents the knight from moving to d5, while giving the queen a chute to probe the white kingside, perhaps. |

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16. g4
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Aggressively pushing towards black's kingside. Is this warranted? I think so -- white has a good presence on the kingside and in the center, and black's pieces are pretty passively posted. |

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16... Nc5
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Seeking exchanges may not be bad for black here, especially if he can remove white's bishop-pair advantage. |

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17. f5
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Will I give up my Bd3 to keep pushing into black's kingside? Apparently, I will! |

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17... exf5
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It's understandable not wishing to expose his king, but I had expected Nxd3. |

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18. exf5
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Isolating black's d-pawn and still threatening to open the kingside. |

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18... Qb6
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?! Now this move looks strong, threatening to win a piece because of the discovered check. But much stronger would've been Ne5. This allows white to embark upon a combination that will give him a small but important advantage... |

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19. Nd5
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! I think this is a very good tactical defense! Either the queen must go back to d8 or black must give her up. |

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19... Ne5
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?! An interesting try, but the exchanging combination favors white. I would've still preferred Qd8 here, but I confess that it's very hard to play something like that psychologically, since you just moved Qd8-Qb6 last move! |

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20. Nxb6
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Forcing black to play Nxf3 , otherwise he loses the queen for not enough. |

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20... Nxf3+
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Of course. Now white heads to the endgame with a small advantage. |

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21. Rxf3
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The best way to get out of check... take the piece! |

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21... Bd4+
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Unexpected! I had thought I'd see axb6, and black has to figure out what to do about his atrocious pawn structure. But this allows white to exchange even MORE of black's pieces. |

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22. Be3
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Basically forcing black to play Bxe3; anything else loses material. |

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22... Bxe3+ 23. Rxe3 axb6
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And this move was necessary now, otherwise white just has a large material edge. So take stock now -- black's pawn structure is a wreck, he has a knight to white's bishop in the endgame, and his rooks are on ineffective squares, and it's white's move. |

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