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50... Kc7 51. Ke3 Kc6 52. Nxf7 Kxc5
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Black is still a pawn up but still the position should be almost equal because for the moment white can defend his pawns and it is hard to see how black can progress. Meanwhile I had been contented with a draw, but my opponent declined my draw offer. So I was forced to play for a win. :-) |

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53. Nd8 Rh6 54. Kd3 Rh3+ 55. Ke2 Kd4
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Black has to exchange or better to erase white's pawns to progress. |

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56. Nxe6+ Kxe5
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56. ... Kxe4? is met by 57. Ng5+ ... |

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57. Ng5 Rg3
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Overcoming white's defense of his pawn. |

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58. Nf3+ Kxe4
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Okay folks, from now on only black can hope for a win. But already Wilhelm Steinitz knew that this endgame of black rook vs. white knight is equal if white succeeds in keeping a close connection between king and knight. So my only chance was to try to create difficulties for my opponent in that.
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59. Nd2+ Kf4 60. Kf2 Rc3 61. Ke2 Rh3
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Aiming to force back the black king on the first line to intensify white's problems to keep the connection between king and knight. |

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62. Kf2 Rh2+
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Succeeded in forcing back the white king. |

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63. Ke1
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63. ... Ke3? aiming for a mate is of course met my 64. Nf1+ ... So the rook has to leave the square h2 first. |

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63... Rh1+
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Aiming for a mate on the first line. |

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64. Ke2 Rh3 65. Kf2 Rh2+ 66. Ke1 Rg2
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Okay that didnt't work and I had to concentrate on escaping the threefold repetition. |

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67. Kd1 Ke3
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For a moment the contact between king and knight is interrupted because of black's pressure. But until now this isn't enough for black to win. |

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68. Nb3 Rb2 69. Nc1
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The only move that keeps the connection between king and knight and thus keeps white in the game. For example 69. Na1 ... ? is met by 69. ... Rb1+. |

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69... Rh2
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I was trying to keep the king locked in lying in wait for the critical mistake. |

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70. Nb3
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Again the only move. |

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70... Kd3
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Threatening the mate on the first line. |

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71. Nc5+
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The critical mistake! Now the white knight is seperated from his king and will fall prey to black sooner or later. Obviously my opponent didn’t knew the aforementioned rule for this endgame. It’s notable that even today strong engines have problems to realize that from now on white is lost. Even after deep calculation they admire 71. Nc5+ .. , 71. Nc1+ ... and 71. Ke1 ... as equal. But only 71. Nc1+ ... is drawish while 71. Nc5+ ... ? and also 71. Ke1 ... ? lose. So the consequences of his move must have been beyond my opponents horizon. |
1 comment
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71... Kd4 72. Na6
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Or 72. Nb3+ Kc3 and then 73. Nc5 Rh4 or 73. Nc1 Rh1+ or 73. Na5 Rh4 and so on. There is no way back for the white knight. |

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72... Rb2 73. Nc7 Ke5 74. Ke1
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Or 74. Na8 Kd6 or 74. Ne8 Rb7. |

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74... Rb7 75. Na6 Kd6 76. Ke2 Rb6
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As I mentioned there is no way out for the white knight. |

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77. Nc7 Kxc7
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The rest is silence. That indeed was a lot of hard work, folks! |

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