HoDoKu Solving Technique Index: Example for "Skyscraper"

Solving Technique Example

Original sudoku:

...........19.2.6......679.9.2...6..37....95...5.....414...3..57.9.24......8.....

Use the following line if you want to load the sudoku in HoDoKu:

:0400:1:+6+9+7.....+2..19+72.6+3..+3..679.9+12...6.+737+4+2+6.95.+8+65+7.+9.+2414+8+6+93+2+757.9.24..+6..+68.+7..+9::117 118 134 135:

The following representation can be pasted in most Sudoku programs:

.-------------.------------------.---------------.

| 6    9    7 | 1345  13458  158 | 1458  148  2  |

| 45   58   1 | 9     7      2   | 458   6    3  |

| 245  258  3 | 145   1458   6   | 7     9    18 |

:-------------+------------------+---------------:

| 9    1    2 | 345   3458   58  | 6     38   7  |

| 3    7    4 | 2     6      18  | 9     5    18 |

| 8    6    5 | 7     13     9   | 13    2    4  |

:-------------+------------------+---------------:

| 1    4    8 | 6     9      3   | 2     7    5  |

| 7    35   9 | 15    2      4   | 138   138  6  |

| 25   235  6 | 8     15     7   | 134   134  9  |

'-------------'------------------'---------------'

Representation of the step:

.-------------.---------------------.------------------.

| 6    9    7 |  1345   13458  *158 | -1458  -148   2  |

| 45   58   1 |  9      7       2   |  458    6     3  |

| 245  258  3 | -145   -1458    6   |  7      9    *18 |

:-------------+---------------------+------------------:

| 9    1    2 |  345    3458    58  |  6      38    7  |

| 3    7    4 |  2      6      *18  |  9      5    *18 |

| 8    6    5 |  7      13      9   |  13     2     4  |

:-------------+---------------------+------------------:

| 1    4    8 |  6      9       3   |  2      7     5  |

| 7    35   9 |  15     2       4   |  138    138   6  |

| 25   235  6 |  8      15      7   |  134    134   9  |

'-------------'---------------------'------------------'



Skyscraper: 1 in r1c6,r3c9 (connected by r5c69) => r1c78,r3c45<>1