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15... Qd6
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Unpinning the N. Not bad. |

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16. Nf3
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Bringing the other N in. It is not all that dangerous, yet. Ng5 allows gxQ, and no mate in sight. Ne5 will just cause an exchange. |

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16... Nf5
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Also good. This N controls h6, adds a defender to g7... |

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17. Bd3
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Threatening to exchange that N. Probably not the best, but I have time to play Qg5, so why would I do that now? |

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17... Nce7
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The other knight makes useless my BxN plan. I can castle and bring in the other R, but this will be really slow. |

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18. Ne5
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Adding pressure to g6. At this poing, both players are well aware that the game will be decided by a sacrifice on g6. All is around how and when. |

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18... c5
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Too late, but what else? The BK can't leave without allowing QxB (even if Rf8 is moved to e8, say). |

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19. Bxf5
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? exB would leave my dsb threatened, and after it defends with d5, Qe6, and black is not any worse than now. |

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19... Nxf5
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...but black followed the script, and left g6 undefended... from a sac! |

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20. Nxg6
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Correctly, now black sees BxN, RxB+, fxR, Qxg6+ and mate. |

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20... cxd4
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Black accepts, very correctly, NxRf8, RxR. In return, he will start worring white with that d4 pawn. If white waits too much, black would cause problems. But the end is nearer than he thinks. |

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21. Ne7#
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THIS is a kind of checkmate in one that could easily be missed. None of the two checks is mate in itself, but the combination of both. That's all, I hope you enjoyed the annotation a got some useful insight about which are the implications of the moves you and your opponent make during a game. My assessements can be wrong, but the idea is to show less-experienced players some ways of thinking that can be of some use. And, of course, how important is to attack, even breaking the "holy principles". :-) |

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