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19... Nxc7 20. d6 Ncd5 21. dxe7
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The correct choice -- Black cannot capture White's bishop without conceding instant mate. |

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21... Nxe7 22. Rd1
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Threatening mate on d8 once again. |

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22... Nc6 23. Bg5
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! Continuing to threaten mate, with Qd8 next and mate in two. |

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23... Bd7 24. Qxd7+ Kf8 25. Qxb7
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! White is interested in displacing Black's rook on a8 (this isn't a pawn grab), the only piece preventing a back row mate. Beware of ..Rb8 too -- White will happily sacrifice his Queen, or else face perpetual check, but then is still guarranteed mate in two. |

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25... Rh2+
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One of very few options left for Black. Teeing up the threat of perpetual check is the best plan now, but it will need a particular error by White to work. |

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26. Kb1 Rb8
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Again, natural for Black to set up a (classical) perpetual check. If White does anything other than trade his Queen here, he will draw. Upon sacrificing his Queen, it is mate in 2... |

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27. Qxb8+
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To continue ..KnxQb8 Rd8#. |

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