HoDoKu Solving Technique Index: Example for "W-Wing"

Solving Technique Example

Original sudoku:

6......7.....2.....58..1.....4.....2...1..9.6597.4...892.4..6.....5.......68.3...

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

:0803:4:6..+9+5..7...+9.2.....58.+31...+1+64+3+8+9+7+52...1+7+59+46597+24+6..892+54+1+76+8+3...5+6+2.....68+93...::417 427 437 489 499:

The following representation can be pasted in most Sudoku programs:

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

| 6     134    123 | 9   5  48 | 12348  7    14   |

| 347   1347   9   | 67  2  48 | 13458  136  145  |

| 247   5      8   | 67  3  1  | 24     269  49   |

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

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

| 238   38     23  | 1   7  5  | 9      4    6    |

| 5     9      7   | 2   4  6  | 13     13   8    |

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

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

| 3478  13478  13  | 5   6  2  | 14     19   1479 |

| 47    147    6   | 8   9  3  | 1245   12   1457 |

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

Representation of the step:

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

| 6     134    #123 | 9   5  48 |  123-48  7    #14    |

| 347   1347    9   | 67  2  48 |  13-458  136   145   |

| 247   5       8   | 67  3  1  |  2-4     269   49    |

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

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

| 238   38      23  | 1   7  5  |  9       4     6     |

| 5     9       7   | 2   4  6  |  13      13    8     |

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

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

| 3478  13478  #13  | 5   6  2  | #14      19    1-479 |

| 47    147     6   | 8   9  3  |  1245    12    1-457 |

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



W-Wing: 4/1 in r1c9,r8c7 connected by 1 in r18c3 => r123c7,r89c9<>4