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

Solving Technique Example

Original sudoku:

.251..........9.3.4..7.89...4....8..15.4.........6...4........8263.4.....8.39.1.6

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

:0803:5:+9251+3+4+6+8+7+8..+6+59+43+24+3+67+289+5+1+64..+1.8..15.4+8..+6.+3.+8.6..+14+5..+2+7+6+3+48263+84+1...+78+439+51+26::549:

The following representation can be pasted in most Sudoku programs:

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

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

| 8  17  17  | 6   5  9   | 4    3   2   |

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

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

| 6  4   279 | 59  1  237 | 8    79  359 |

| 1  5   279 | 4   8  237 | 27   6   39  |

| 3  79  8   | 59  6  27  | 257  1   4   |

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

| 5  19  19  | 2   7  6   | 3    4   8   |

| 2  6   3   | 8   4  1   | 57   79  59  |

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

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

Representation of the step:

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

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

| 8  17  17  |  6   5  9   | 4     3    2    |

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

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

| 6  4   279 | #59  1  237 | 8    #79   3-59 |

| 1  5   279 |  4   8  237 | 27    6    39   |

| 3  79  8   |  59  6  27  | 257   1    4    |

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

| 5  19  19  |  2   7  6   | 3     4    8    |

| 2  6   3   |  8   4  1   | 57   #79  #59   |

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

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



W-Wing: 5/9 in r4c4,r8c9 connected by 9 in r48c8 => r4c9<>5