HoDoKu Solving Technique Index: Example for "Discontinuous Nice Loop (delete candidate)"

Solving Technique Example

Original sudoku:

....8.2....5....4..2...5........7......21..971.4....3...........973..52...8.5136.

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

:0707s:7:....8.2....5....4..2...5...+9+6+2+8+37.....+321+4+6971+74+5..+83+2..+1......+6973+4+852+1+2+48+75136+9::718:

The following representation can be pasted in most Sudoku programs:

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

| 347   13   69 | 1469  8     369  | 2    157  356 |

| 378   138  5  | 169   2679  2369 | 179  4    368 |

| 3478  2    69 | 1469  679   5    | 179  178  368 |

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

| 9     6    2  | 8     3     7    | 14   15   45  |

| 58    58   3  | 2     1     4    | 6    9    7   |

| 1     7    4  | 5     69    69   | 8    3    2   |

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

| 35    35   1  | 69    269   269  | 47   78   48  |

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

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

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

Representation of the step:

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

| 347   13   69 | 1469  8     369  | 2    *15-7   356 |

| 378   138  5  | 169   2679  2369 | 179   4      368 |

| 3478  2    69 | 1469  679   5    | 179   178    368 |

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

| 9     6    2  | 8     3     7    | 14   *15    *45  |

| 58    58   3  | 2     1     4    | 6     9      7   |

| 1     7    4  | 5     69    69   | 8     3      2   |

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

| 35    35   1  | 69    269   269  | 47   *78    *48  |

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

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

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



Discontinuous Nice Loop r1c8 -7- r7c8 -8- r7c9 -4- r4c9 -5- r4c8 =5= r1c8 => r1c8<>7