Hi all,

I have gotten as far as below and I can't seem to figure out the next step. Any help would be appreciated. I am not looking for a solution but just how to go to the next step and how did you find it? Much appreciated.

Thanks.

|--------------------|

|1 - - | - - -| 7 - - |

|9 4 - |- 5 -| 2 6 - |

|3 - - |- - 4| - 8 - |

|---------------- ---|

|- 1 9 | - - -| - 5 7|

| - 5 3| - 7 -| 9 1 -|

| - 7 - | - - -| 8 2 -|

|--------------------|

| - - - | 6 - -| - - - |

| - 3 1| - 4 -| - 9 2|

| - - 2| - - -| - - 8|

|---------------------|