HoDoKu Solving Technique Index: Example for "Empty Rectangle"

Solving Technique Example

Original sudoku:

7...56.381.842.............5..3......4..8.7....1...24...3.........1....5.5...7.6.

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

:0402:9:7+2+4+956+1381+6842+3+5+9+7+9+3+5+7+1+8+6+2+45..3..+8+1..4..8+17+5..+81.+7.24..+13....+7+2...1...+85.5...7.6+1::986:

The following representation can be pasted in most Sudoku programs:

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

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

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

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

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

| 5    79  2679 | 3    469   249 | 8    1  69  |

| 236  4   269  | 26   8     1   | 7    5  369 |

| 36   8   1    | 56   7     59  | 2    4  369 |

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

| 468  1   3    | 568  469   459 | 49   7  2   |

| 246  79  2679 | 1    3469  249 | 349  8  5   |

| 248  5   29   | 28   349   7   | 349  6  1   |

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

Representation of the step:

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

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

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

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

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

| 5    *79  2679 | 3    469   249  | 8    1  69  |

| 236   4   269  | 26   8     1    | 7    5  369 |

| 36    8   1    | 56   7     59   | 2    4  369 |

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

| 468   1   3    | 568  469   459  | 49   7  2   |

| 246  *79  2679 | 1    3469  24-9 | 349  8  5   |

| 248   5   29   | 28   349   7    | 349  6  1   |

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



Empty Rectangle: 9 in b5 (r48c2) => r8c6<>9