HoDoKu Solving Technique Index: Example for "Turbot Fish"

Solving Technique Example

Original sudoku:

.81.2............9..68...4...31..7....8.57916........45....6.9223...84...........

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

:0403:5:.81.2.+6...+4+2.+6..+89.+568..+24.+6+931+4+27+5+8+4+28+357916+1+7+5+6+8+9+3+245+1..+36+89223...84+6.+8+6.+2.....::524:

The following representation can be pasted in most Sudoku programs:

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

| 379  8  1   | 4579  2    345 | 6   37  357  |

| 37   4  2   | 57    6    135 | 15  8   9    |

| 379  5  6   | 8     179  13  | 2   4   137  |

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

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

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

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

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

| 5    1  47  | 47    3    6   | 8   9   2    |

| 2    3  79  | 579   179  8   | 4   6   157  |

| 8    6  479 | 2     179  145 | 15  37  1357 |

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

Representation of the step:

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

| 379  8  1   |  4579  2    345 |  6   37   357  |

| 37   4  2   | -57    6    135 | *15  8    9    |

| 379  5  6   |  8     179  13  |  2   4    137  |

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

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

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

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

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

| 5    1  47  |  47    3    6   |  8   9    2    |

| 2    3  79  | *579   179  8   |  4   6   *157  |

| 8    6  479 |  2     179  145 | *15  37   1357 |

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



Turbot Fish r2c7 =5= r9c7 -5- r8c9 =5= r8c4 => r2c4<>5