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18. exf6 Rg8
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This is the final costly move for Dufresne. It appears natural, but with Anderssen's next move, there is nothing he can do to stop the onslaught. I don't know what would be better though, perhaps castling. |

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19. Rad1
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The key move to the mating sequence, although I don't believe this is the point where Anderssen knew he had won, I think that was at least two moves earlier. Unfortunately, he is dead and I couldn't call and ask him. |

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19... Qxf3
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Naturally, Dufresne is licking his chops! He is saying to himself, "self, you have played masterfully and we are about to destroy this guy." .......... |

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20. Rxe7+ Nxe7 21. Qxd7+ Kxd7 22. Bf5+
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Now we get to see the importance of the Rad1 move, not so much for the discovered check, but if it was not there, then Black could escape to c6 without the threat of checkmate, and Black would ultimately win. Perhaps Dufresne saw this combination earlier too, but just assumed Bb5 , which would have led to victory for Black also. |

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22... Ke8
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Forced. |

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23. Bd7+ Kf8
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Either way black goes here, the result is the same... |

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24. Bxe7#
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Checkmate. I love games where the opponent is only one move away from mate, but then has to endure a drawn out mating process. Going back to my original question: How early did Anderssen see the mate? |

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