HoDoKu Solving Technique Index: Example for "Hidden Rectangle with missing candidate"

Solving Technique Example

Original sudoku:

....41....7....5.........6.5..7..68..9.3............4.4.1.8.......2..7...........

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

:0606:23:....41+8.+7.7+4...5+1..+1..+7.+46.5+4+37..68+1+19+83+6+4+2+7+5...+1+5+8.4.4.1.8+7..+6.+8.2+1.7.+4...+4..+1.+8:218 221 321 921 924 626 926 329 231 233 336 398:339::

The following representation can be pasted in most Sudoku programs:

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

| 2369   2356  2569  | 569  4    1    | 8   39    7   |

| 68     7     4     | 68   239  23   | 5   1     29  |

| 389    1     59    | 589  7    259  | 4   6     239 |

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

| 5      4     3     | 7    29   29   | 6   8     1   |

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

| 267    26    267   | 1    5    8    | 39  4     39  |

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

| 4      235   1     | 59   8    7    | 39  2359  6   |

| 369    8     569   | 2    1    3569 | 7   359   4   |

| 23679  2356  25679 | 4    39   3569 | 1   259   8   |

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

Representation of the step:

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

| 2369   2356  2569  | 569  4     1    | 8   39     7    |

| 68     7     4     | 68   239  *23   | 5   1     *29   |

| 389    1     59    | 589  7    *259  | 4   6     *2-39 |

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

| 5      4     3     | 7    29    29   | 6   8      1    |

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

| 267    26    267   | 1    5     8    | 39  4      39   |

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

| 4      235   1     | 59   8     7    | 39  2359   6    |

| 369    8     569   | 2    1     3569 | 7   359    4    |

| 23679  2356  25679 | 4    39    3569 | 1   259    8    |

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

Hidden Rectangle: 2/3 in r2c69,r3c69 => r3c9<>3