HoDoKu Solving Technique Index: Example for "Swordfish"

Solving Technique Example

Original sudoku:

16.54..7...8..1.3..3.8.....7...5..696..9.2.57.............3..4........16...1645..

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

:0301:2:16.54+3.7..+78+6.1+43+5+43+58.+7+6.+17+2.+45+8.696..9+12.57...+3+7+6..+4.+1+6.3..4.+3...+8..16..+71645.+3::268 271:r239 c158

The following representation can be pasted in most Sudoku programs:

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

| 1     6    29  | 5   4   3  | 289   7    28 |

| 29    7    8   | 6   29  1  | 4     3    5  |

| 4     3    5   | 8   29  7  | 6     29   1  |

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

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

| 6     48   34  | 9   1   2  | 38    5    7  |

| 589   589  19  | 3   7   6  | 128   28   4  |

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

| 2589  1    6   | 27  3   59 | 2789  4    28 |

| 3     459  249 | 27  8   59 | 279   1    6  |

| 289   89   7   | 1   6   4  | 5     289  3  |

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

Representation of the step:

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

|  1     6    29  | 5    4   3  | 289    7    28 |

| *29    7    8   | 6   *29  1  | 4      3    5  |

|  4     3    5   | 8   *29  7  | 6     *29   1  |

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

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

|  6     48   34  | 9    1   2  | 38     5    7  |

|  589   589  19  | 3    7   6  | 128   -28   4  |

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

| -2589  1    6   | 27   3   59 | 2789   4    28 |

|  3     459  249 | 27   8   59 | 279    1    6  |

| *289   89   7   | 1    6   4  | 5     *289  3  |

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



Swordfish: 2 r239 c158 => r6c8,r7c1<>2