HoDoKu Solving Technique Index: Example for "Empty Rectangle (only two candidates in the ER)"

Solving Technique Example

Original sudoku:

7...54.1..6387.4255.4...7..27.4....14..92...7.....7542852.43.7939.782.54.4759.283

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

:0402:6:7...54.1..6387.4255.4...7..27.4....14..92...7.....7542852.43.7939.782.54.4759.283:617 817 136 638 843 943 646 647 852 853 156 656 657 161 162 163 663:664:

The following representation can be pasted in most Sudoku programs:

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

| 7   28   89  | 236   5    4  | 39   1    68 |

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

| 5   128  4   | 1236  136  69 | 7    39   68 |

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

| 2   7    56  | 4     36   58 | 389  369  1  |

| 4   13   156 | 9     2    58 | 38   36   7  |

| 69  38   89  | 136   136  7  | 5    4    2  |

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

| 8   5    2   | 16    4    3  | 16   7    9  |

| 3   9    16  | 7     8    2  | 16   5    4  |

| 16  4    7   | 5     9    16 | 2    8    3  |

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

Representation of the step:

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

|  7   28   89  | 236   5    4  | 39   1    68 |

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

|  5   128  4   | 1236  136  69 | 7    39   68 |

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

|  2   7    56  | 4     36   58 | 389  369  1  |

|  4   13   156 | 9     2    58 | 38   36   7  |

| *69  38   89  | 13-6  136  7  | 5    4    2  |

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

|  8   5    2   | 16    4    3  | 16   7    9  |

|  3   9    16  | 7     8    2  | 16   5    4  |

| *16  4    7   | 5     9    16 | 2    8    3  |

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



Empty Rectangle: 6 in b8 (r69c1) => r6c4<>6