HoDoKu Solving Technique Index: Example for "Dual Empty Rectangle"

Solving Technique Example

Original sudoku:

47...........2...78..5..34..6..7..8...9.45..3.8......2741..32............9.2...5.

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

:0402:9:47.....+2.+9+3.+42...78+1+25.+734.+36+4.7+2.8.+1+29+845+6+73+58+7...+4.2741.+532.+8+2+5+8+7...+3.+69+32..+75.::968 974:

The following representation can be pasted in most Sudoku programs:

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

| 4  7  56 | 1369  13689  1689 | 1589  2   1569 |

| 9  3  56 | 4     2      168  | 158   16  7    |

| 8  1  2  | 5     69     7    | 3     4   69   |

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

| 3  6  4  | 19    7      2    | 159   8   159  |

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

| 5  8  7  | 1369  1369   169  | 4     19  2    |

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

| 7  4  1  | 69    5      3    | 2     69  8    |

| 2  5  8  | 7     169    1469 | 19    3   1469 |

| 6  9  3  | 2     18     148  | 7     5   14   |

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

Representation of the step:

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

| 4  7  56 |  1369  13689  1689 | 1589   2    1569 |

| 9  3  56 |  4     2      168  | 158    16   7    |

| 8  1  2  |  5     69     7    | 3      4    69   |

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

| 3  6  4  |  19    7      2    | 159    8    159  |

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

| 5  8  7  |  1369  1369   169  | 4     *1-9  2    |

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

| 7  4  1  | *6-9   5      3    | 2     *69   8    |

| 2  5  8  |  7     169    1469 | 19     3    1469 |

| 6  9  3  |  2     18     148  | 7      5    14   |

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



Dual Empty Rectangle: 9 in b5 (r67c8/r7c48) => r6c8,r7c4<>9






Copyright © 2008-12 by Bernhard Hobiger
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