HoDoKu Solving Technique Index: Example for "Avoidable Rectangle Type 1"

Solving Technique Example

Original sudoku:

.5........6.5.42....8.71...4....36.8.........89.1..7..3...........2.7.1..72.3..9.

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

:0607:9:+95+4+3..+1.+7+76+15.42..+2+38.71...4+1...36.8.+2....+9.+189.1..7..3...+1+9.+7+2..+92.7+31.+172.3..9.:639:929:

The following representation can be pasted in most Sudoku programs:

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

| 9   5   4    | 3     268   268 | 1    68    7   |

| 7   6   1    | 5     89    4   | 2    38    39  |

| 2   3   8    | 69    7     1   | 45   456   459 |

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

| 4   1   57   | 79    259   3   | 6    25    8   |

| 56  2   3567 | 4678  4568  568 | 9    345   1   |

| 8   9   356  | 1     2456  256 | 7    2345  345 |

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

| 3   48  56   | 468   1     9   | 458  7     2   |

| 56  48  9    | 2     4568  7   | 3    1     456 |

| 1   7   2    | 468   3     568 | 458  9     456 |

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

Representation of the step:

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

| *9   5   4    | 3     268   268 | 1    68    *7   |

| *7   6   1    | 5     89    4   | 2    38    *3-9 |

|  2   3   8    | 69    7     1   | 45   456    459 |

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

|  4   1   57   | 79    259   3   | 6    25     8   |

|  56  2   3567 | 4678  4568  568 | 9    345    1   |

|  8   9   356  | 1     2456  256 | 7    2345   345 |

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

|  3   48  56   | 468   1     9   | 458  7      2   |

|  56  48  9    | 2     4568  7   | 3    1      456 |

|  1   7   2    | 468   3     568 | 458  9      456 |

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



Avoidable Rectangle Type 1: 9/7 in r1c19,r2c19 => r2c9<>9