HoDoKu Solving Technique Index: Example for "Hidden Pair"

Solving Technique Example

Original sudoku:

.............4273...67...4..94..........96.....7....231......85.6..8.27...5.1....

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

:0210:123589:....+6........4273+6..67+3..4..94....+6+8....96+4.+7+6.7.+5.+9231......85.6..8.27+1..5.1..+9+4::112 211 212 311 312 511 512 811 812 911:

The following representation can be pasted in most Sudoku programs:

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

| 2345789  1234578  12389 | 1589   6   1589 | 158  15  29 |

| 589      158      189   | 1589   4   2    | 7    3   6  |

| 2589     1258     6     | 7      3   1589 | 158  4   29 |

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

| 235      9        4     | 123    27  137  | 15   6   8  |

| 2358     12358    1238  | 1238   9   6    | 4    15  7  |

| 6        18       7     | 148    5   148  | 9    2   3  |

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

| 1        2347     239   | 23469  27  3479 | 36   8   5  |

| 349      6        39    | 3459   8   3459 | 2    7   1  |

| 2378     2378     5     | 236    1   37   | 36   9   4  |

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

Representation of the step:

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

| *-2-34-57-8-9  *-1-2-34-57-8  12389 | 1589   6   1589 | 158  15  29 |

|  589            158           189   | 1589   4   2    | 7    3   6  |

|  2589           1258          6     | 7      3   1589 | 158  4   29 |

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

|  235            9             4     | 123    27  137  | 15   6   8  |

|  2358           12358         1238  | 1238   9   6    | 4    15  7  |

|  6              18            7     | 148    5   148  | 9    2   3  |

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

|  1              2347          239   | 23469  27  3479 | 36   8   5  |

|  349            6             39    | 3459   8   3459 | 2    7   1  |

|  2378           2378          5     | 236    1   37   | 36   9   4  |

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



Hidden Pair: 4,7 in r1c12 => r1c2<>1, r1c12<>2, r1c12<>3, r1c12<>5, r1c12<>8, r1c1<>9