Hello there,

Im not a huge fan of sudoku, but I like to spend some time on it every now and then :> So I got this sudoku in a newspaper, it's marked as "Hard". I tried to solve it for a few hours but managed to write only 5 digits. So Im asking for a hint, what should be my next step ? :>

Starting sudoku:

*-----------*

|... |.2.|.1.|

|67.|... |... |

|9..|6..|8.3|

|---+---+---|

|.2.|4..|..1 |

|..9|... |6.. |

|1..|..7|.9. |

|---+---+---|

|5.3|..1|..2 |

|... |... |.54 |

|.8.|.5. |... |

*-----------*

The point Im stuck at :

*-----------*

|... |.2.|.16|

|67.|... |... |

|91.|6..|8.3|

|---+---+---|

|.2.|4..|..1 |

|..9|... |6.. |

|1..|..7|.9. |

|---+---+---|

|5.3|..1|.82 |

|.9. |... |.54 |

|.8.|.5. |.6. |

*-----------*