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

Solving Technique Example

Original sudoku:

....6........1.863..3..9...9.4......3.....7.457.82.........658.69...7.......4..3.

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

:0800:2:+8..+36.+9....+9.1.863.+63.+89..+59+24+6+7+3+1+5+83+8+6+9+5+17+2457+182+4+3+9+6+4+3+2+1+9658+769+8+5+37......+24+8+63+9::226:

The following representation can be pasted in most Sudoku programs:

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

| 8    145  57 | 3   6  25 | 9   147  12 |

| 27   45   9  | 47  1  25 | 8   6    3  |

| 127  6    3  | 47  8  9  | 24  147  5  |

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

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

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

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

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

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

| 6    9    8  | 5   3  7  | 24  14   12 |

| 17   15   57 | 2   4  8  | 6   3    9  |

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

Representation of the step:

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

|  8    145  *57 | 3   6  *25 | 9   147  12 |

| *27   45    9  | 47  1  -25 | 8   6    3  |

|  127  6     3  | 47  8   9  | 24  147  5  |

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

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

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

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

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

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

|  6    9     8  | 5   3   7  | 24  14   12 |

|  17   15    57 | 2   4   8  | 6   3    9  |

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



XY-Wing: 5/7/2 in r1c36,r2c1 => r2c6<>2