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

Solving Technique Example

Original sudoku:

9...627....5..3...........67...3.........9...8.2.45..9..35.1.28.4......5.1.......

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

:0300:1:9+8..627+5+3.+65..3...+3+2+7.+5...67+9..3.+5...+5...9...8+32.45..9+6+735+91+428+24+9.+8+7..5+51+8.+2...+7::124 127 128 129 153 154 157 158 159:c15 r25

The following representation can be pasted in most Sudoku programs:

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

| 9   8  14  | 14     6   2  | 7      5       3   |

| 14  6  5   | 14789  17  3  | 1289   1489    124 |

| 3   2  7   | 1489   5   48 | 189    1489    6   |

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

| 7   9  146 | 1268   3   68 | 5      1468    124 |

| 14  5  146 | 12678  17  9  | 12368  134678  124 |

| 8   3  2   | 167    4   5  | 16     167     9   |

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

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

| 2   4  9   | 36     8   7  | 136    136     5   |

| 5   1  8   | 346    2   46 | 369    369     7   |

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

Representation of the step:

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

|  9   8   14  |  14      6   2  |  7       5        3   |

| *14  6   5   | -14789  *17  3  | -1289   -1489    -124 |

|  3   2   7   |  1489    5   48 |  189     1489     6   |

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

|  7   9   146 |  1268    3   68 |  5       1468     124 |

| *14  5  -146 | -12678  *17  9  | -12368  -134678  -124 |

|  8   3   2   |  167     4   5  |  16      167      9   |

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

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

|  2   4   9   |  36      8   7  |  136     136      5   |

|  5   1   8   |  346     2   46 |  369     369      7   |

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



X-Wing: 1 c15 r25 => r2c4789,r5c34789<>1