HoDoKu Solving Technique Index: Example for "Locked Pair"

Solving Technique Example

Original sudoku:

.5..346..........8.3.879....15.....6...26..5.......92..4..27.13.73...........87..

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

:0110:2:.5.+1346...+9.+6+5+2+1+38.3.879.+4.+215..+3..6.+8.26+1+35.+3+6..+8+592+1.4..27.13.73..+6....+2.+3.87+6.::219 233:

The following representation can be pasted in most Sudoku programs:

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

| 78    5  278 | 1    3    4 | 6     79  279  |

| 47    9  47  | 6    5    2 | 1     3   8    |

| 16    3  126 | 8    7    9 | 25    4   25   |

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

| 2     1  5   | 479  49   3 | 48    78  6    |

| 479   8  479 | 2    6    1 | 3     5   47   |

| 3     6  47  | 47   8    5 | 9     2   1    |

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

| 5689  4  689 | 59   2    7 | 58    1   3    |

| 1589  7  3   | 459  149  6 | 2458  89  2459 |

| 159   2  19  | 3    149  8 | 7     6   459  |

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

Representation of the step:

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

| 78    5  278  | 1    3    4 |  6     79  -279  |

| 47    9  47   | 6    5    2 |  1     3    8    |

| 16    3  1-26 | 8    7    9 | *25    4   *25   |

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

| 2     1  5    | 479  49   3 |  48    78   6    |

| 479   8  479  | 2    6    1 |  3     5    47   |

| 3     6  47   | 47   8    5 |  9     2    1    |

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

| 5689  4  689  | 59   2    7 |  58    1    3    |

| 1589  7  3    | 459  149  6 |  2458  89   2459 |

| 159   2  19   | 3    149  8 |  7     6    459  |

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



Locked Pair: 2,5 in r3c79 => r1c9,r3c3<>2