HoDoKu Solving Technique Index: Example for "Hidden Quadruple"

Solving Technique Example

Original sudoku:

.3.....1...8.9....4..6.8.......7694.......52....124...2.6...19....7......95...47.

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

:0212:3678:.3.....1...8.9....4..6.8......+57694....+9+8+352....124...2+76..+519....7.+9....95...47.:121 151 361 861 485 299:329 339 389 619 629 689 719 729 739 819 889:

The following representation can be pasted in most Sudoku programs:

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

| 5679  3     279  | 24   45   27  | 2678  1     2456789 |

| 567   1256  8    | 234  9    127 | 2367  356   234567  |

| 4     125   1279 | 6    135  8   | 237   35    23579   |

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

| 138   128   123  | 5    7    6   | 9     4     138     |

| 67    146   147  | 9    8    3   | 5     2     167     |

| 5679  568   379  | 1    2    4   | 3678  368   3678    |

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

| 2     7     6    | 348  34   5   | 1     9     38      |

| 138   148   134  | 7    136  9   | 2368  3568  23568   |

| 138   9     5    | 238  136  12  | 4     7     368     |

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

Representation of the step:

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

| 5679  3     279  | 24   45   27  | 2678  1     *245-6-7-89 |

| 567   1256  8    | 234  9    127 | 2367  356   *2-345-6-7  |

| 4     125   1279 | 6    135  8   | 237   35    *2-35-79    |

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

| 138   128   123  | 5    7    6   | 9     4      138        |

| 67    146   147  | 9    8    3   | 5     2      167        |

| 5679  568   379  | 1    2    4   | 3678  368    3678       |

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

| 2     7     6    | 348  34   5   | 1     9      38         |

| 138   148   134  | 7    136  9   | 2368  3568  *2-35-6-8   |

| 138   9     5    | 238  136  12  | 4     7      368        |

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



Hidden Quadruple: 2,4,5,9 in r1238c9 => r238c9<>3, r128c9<>6, r123c9<>7, r18c9<>8