HoDoKu Solving Technique Index: Example for "Hidden Rectangle"

Solving Technique Example

Original sudoku:

.9...21.....73..2.52......81.3.47.......6..3.8.......57.68.4...9..........1.....4

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

:0606:9:+39+4+6+821+5+7+6+1+873+5+42+952+7+4..+3+681+53.47..+6+4+7.+56+8.3+18+6....+7+457+368.4..+29+4+5.....+3+2+81.....4::995:

The following representation can be pasted in most Sudoku programs:

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

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

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

| 5  2  7  | 4     19   19  | 3    6    8 |

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

| 1  5  3  | 29    4    7   | 289  89   6 |

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

| 8  6  29 | 1239  129  139 | 7    4    5 |

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

| 7  3  6  | 8     159  4   | 59   19   2 |

| 9  4  5  | 12    127  16  | 68   178  3 |

| 2  8  1  | 39    579  369 | 569  79   4 |

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

Representation of the step:

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

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

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

| 5  2  7  | 4      19    19  |  3    6    8 |

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

| 1  5  3  | 29     4     7   |  289  89   6 |

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

| 8  6  29 | 1239   129   139 |  7    4    5 |

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

| 7  3  6  | 8     *159   4   | *59   19   2 |

| 9  4  5  | 12     127   16  |  68   178  3 |

| 2  8  1  | 39    *57-9  369 | *569  79   4 |

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



Hidden Rectangle: 5/9 in r7c57,r9c57 => r9c5<>9