HoDoKu Solving Technique Index: Example for "UR Type 6 with missing candidate"

Solving Technique Example

Original sudoku:

....68.7.52....9.............1.7.......5..2...4.......8.......69..2.......6....3.

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

:0605:38:+4+9+3+168+57+252+8...9+6+1+1+6+7+9+2+5...+3+51.7+2+6+9.+6+8+95..2.+7+74+2+6...+5.8.+5....+269.+42.+6..+5+2.6.+5..3+9:437 839 365 366 867:339 367::

The following representation can be pasted in most Sudoku programs:

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

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

| 5  2    8 | 347  34    347   | 9     6   1  |

| 1  6    7 | 9    2     5     | 38    48  34 |

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

| 3  5    1 | 48   7     2     | 6     9   48 |

| 6  8    9 | 5    134   134   | 2     14  7  |

| 7  4    2 | 6    189   19    | 13    5   38 |

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

| 8  137  5 | 347  1349  13479 | 147   2   6  |

| 9  137  4 | 2    138   6     | 178   18  5  |

| 2  17   6 | 478  5     147   | 1478  3   9  |

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

Representation of the step:

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

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

| 5  2    8 | 347  34    347   |  9     6    1   |

| 1  6    7 | 9    2     5     | *38    48  *-34 |

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

| 3  5    1 | 48   7     2     |  6     9    48  |

| 6  8    9 | 5    134   134   |  2     14   7   |

| 7  4    2 | 6    189   19    | *1-3   5   *38  |

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

| 8  137  5 | 347  1349  13479 |  147   2    6   |

| 9  137  4 | 2    138   6     |  178   18   5   |

| 2  17   6 | 478  5     147   |  1478  3    9   |

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

Uniqueness Test 6: 3/8 in r3c79,r6c79 => r3c9,r6c7<>3