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

Solving Technique Example

Original sudoku:

.........76...3..2..264...94.39...7......49.3..5....2..1.56....37..9..41.......6.

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

:0300:5:.+4+1+7+2+9.+3.76+9..3+4.2.+3264.+7+194.39..+17.+6.+7..49.3+1+95+3+7..2+4+21+456+7+3+9+837+6.9.+541+9+5+8+4+3+1+26+7::545:r25 c58

The following representation can be pasted in most Sudoku programs:

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

| 58  4   1 | 7    2    9    | 68  3   56 |

| 7   6   9 | 18   158  3    | 4   58  2  |

| 58  3   2 | 6    4    58   | 7   1   9  |

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

| 4   28  3 | 9    58   2568 | 1   7   56 |

| 6   28  7 | 128  158  4    | 9   58  3  |

| 1   9   5 | 3    7    68   | 68  2   4  |

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

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

| 3   7   6 | 28   9    28   | 5   4   1  |

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

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

Representation of the step:

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

| 58  4   1 | 7     2    9    | 68   3   56 |

| 7   6   9 | 18   *158  3    | 4   *58  2  |

| 58  3   2 | 6     4    58   | 7    1   9  |

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

| 4   28  3 | 9    -58   2568 | 1    7   56 |

| 6   28  7 | 128  *158  4    | 9   *58  3  |

| 1   9   5 | 3     7    68   | 68   2   4  |

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

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

| 3   7   6 | 28    9    28   | 5    4   1  |

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

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



X-Wing: 5 r25 c58 => r4c5<>5