HoDoKu Solving Technique Index: Example for "UR Type 1 with missing candidate"

Solving Technique Example

Original sudoku:

7....45..39..................2...6...1.9........3..8..4..1...3.8...6...........1.

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

:0600:28:7.+6.+145+9+339....+1..+1...+3+9....+32...6...1+89..+3...+4+73..8..4.+91...3.8+7+1.6+3+9..+2.+3.+9..1.:626 228 428 728 629 829 532 234 737 238 438 738 639 839 444 449 549 749 759 561 266 566 269 569 279 579 779 584 499 599 799:834::

The following representation can be pasted in most Sudoku programs:

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

| 7   28  6  | 28     1     4    | 5   9     3   |

| 3   9   45 | 25678  2578  2578 | 1   68    247 |

| 1   28  45 | 5678   3     9    | 24  68    247 |

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

| 59  3   2  | 578    4578  1578 | 6   457   19  |

| 56  1   8  | 9      2457  2567 | 3   2457  245 |

| 69  4   7  | 3      25    16   | 8   25    19  |

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

| 4   56  9  | 1      2578  2578 | 27  3     68  |

| 8   7   1  | 24     6     3    | 9   245   245 |

| 2   56  3  | 4578   9     578  | 47  1     68  |

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

Representation of the step:

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

| 7   *28  6  | *28     1     4    | 5   9     3   |

| 3    9   45 |  25678  2578  2578 | 1   68    247 |

| 1   *28  45 | *567-8  3     9    | 24  68    247 |

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

| 59   3   2  |  578    4578  1578 | 6   457   19  |

| 56   1   8  |  9      2457  2567 | 3   2457  245 |

| 69   4   7  |  3      25    16   | 8   25    19  |

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

| 4    56  9  |  1      2578  2578 | 27  3     68  |

| 8    7   1  |  24     6     3    | 9   245   245 |

| 2    56  3  |  4578   9     578  | 47  1     68  |

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

Uniqueness Test 1: 2/8 in r1c24,r3c24 => r3c4<>8