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

Solving Technique Example

Original sudoku:

.....896.1..7......675..3..21...78....489...37....4..5.219....4................26

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

:0600:89:+5.+2..896+71..7..+4+5+2.675..3+8+121+3+6+578+4+9+6+5489+1+2+737....4+6+15+8219...+34+3.+6....+9+8..+5.+8+3.26::822 922:

The following representation can be pasted in most Sudoku programs:

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

| 5   34   2  | 134  134   8  | 9    6  7 |

| 1   389  89 | 7    36    69 | 4    5  2 |

| 49  6    7  | 5    24    29 | 3    8  1 |

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

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

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

| 7   89   89 | 23   23    4  | 6    1  5 |

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

| 8   2    1  | 9    67    56 | 57   3  4 |

| 3   47   6  | 124  1247  25 | 157  9  8 |

| 49  479  5  | 14   8     3  | 17   2  6 |

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

Representation of the step:

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

| 5    34      2  | 134  134   8  | 9    6  7 |

| 1   *3-8-9  *89 | 7    36    69 | 4    5  2 |

| 49   6       7  | 5    24    29 | 3    8  1 |

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

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

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

| 7   *89     *89 | 23   23    4  | 6    1  5 |

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

| 8    2       1  | 9    67    56 | 57   3  4 |

| 3    47      6  | 124  1247  25 | 157  9  8 |

| 49   479     5  | 14   8     3  | 17   2  6 |

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



Uniqueness Test 1: 8/9 in r2c23,r6c23 => r2c2<>8, r2c2<>9