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

Solving Technique Example

Original sudoku:

..7.4..32......7.....91.6..83.7694..5....8.......24....8......1..3......9......64

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

:0600:23:+1+97+84+6+532..+8.+5.7+1+9+3+5+291+76+4+883+17694+2+55+2+4+1+38+9+7+6..+9+524+1+8+3.8+6+4....1..3+6....+79.+5....64::296 396:

The following representation can be pasted in most Sudoku programs:

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

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

| 46  46  8 | 23  5   23  | 7    1   9 |

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

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

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

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

| 67  67  9 | 5   2   4   | 1    8   3 |

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

| 27  8   6 | 4   79  235 | 23   59  1 |

| 24  14  3 | 6   89  125 | 28   59  7 |

| 9   17  5 | 23  78  123 | 238  6   4 |

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

Representation of the step:

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

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

| 46  46  8 | *23  5   *23    | 7    1   9 |

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

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

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

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

| 67  67  9 |  5   2    4     | 1    8   3 |

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

| 27  8   6 |  4   79   235   | 23   59  1 |

| 24  14  3 |  6   89   125   | 28   59  7 |

| 9   17  5 | *23  78  *1-2-3 | 238  6   4 |

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



Uniqueness Test 1: 2/3 in r2c46,r9c46 => r9c6<>2, r9c6<>3