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11. cxd5 Bxd2+
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Also forced. |

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12. Nxd2
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12. Qxd2 would've been better, but black has 12. ...Nxd4 with a slight advantage. |

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12... Nb4
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White cannot save the bishop without losing something. 13. Qb1 exd4 is better for black. |

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13. Qe4
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This is a mistake. White has to abandon the bishop on h7 with 13. Qb3, but again black can play 13. ...exd4 with the better game. |

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13... f5
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Now the bishop is lost without compensation. White may have over looked that the black queen controls the h4 square, so the white queen is forced to retreat. |

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14. Qb1
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If 14. Bxf5 Bxf5 followed by 15. ...Nc2 winning. |

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14... Kxh7
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Establishing material superiority. |

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15. O-O exd4 16. exd4 Nxd5
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The captures are over and black is a piece ahead. |

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17. Qd3
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First 17. Re1 taking over the e-file would've been a bit better. |

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17... Qg5
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Transferring the queen to the kingside and threatening 18. ...Nf4. |

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18. Qh3+
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18. Nf3 was better, because white needs to avoid a further reduction in material. When ahead in pieces, each piece exchange (of equal value) increases your winning chances. This is termed simplification in chess. (It is easier to convert a 6-3 material advantage than one of 15-12, even though you are 3 in both cases.) |

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18... Qh6 19. Nf3
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White's best chance was probably to go back to d3 with the queen. |

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19... Qxh3
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Once the queens come off the board, black's material advantage is even more pronounced. |

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20. Ng5+
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Temporarily preserving the integrity of his kingside pawn structure. |

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20... Kg6 21. Nxh3
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The knight, however, has nowhere to go now. |

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21... f4
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So, black attacks it. White's kingside pawn structure will be ruined no matter what. |

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22. a3
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Moving a rook to the e-file would've been a more active plan. |

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22... Bxh3 23. gxh3 f3
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Clearing the f4 square for the knight, and sealing in the white king. |

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24. Rae1
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A little too little too late. |

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24... Nf4
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White's doubled h-pawn's provide scant shelter for the king. |

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