HoDoKu Solving Technique Index: Example for "Forcing Chain Verity (only chain 2)"

Solving Technique Example

Original sudoku:

.7..96.....352.68...6..47.248.....2..........51..............7.....3.5.9168.....3

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

:1202::+27+1+896...+9+4352+768+1+8+56+3+147+9248.....2.+6+3.......51.......+3+9+5....7.+7+2+4.3+85.9168...+2+43:::

The following representation can be pasted in most Sudoku programs:

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

| 2  7  1   | 8      9     6    | 34    35  45   |

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

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

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

| 4  8  79  | 1679   567   1359 | 139   2   567  |

| 6  3  279 | 12479  4578  1259 | 1489  15  4578 |

| 5  1  279 | 24679  4678  239  | 3489  36  4678 |

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

| 3  9  5   | 1246   46    12   | 18    7   68   |

| 7  2  4   | 16     3     8    | 5     16  9    |

| 1  6  8   | 79     57    59   | 2     4   3    |

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

Representation of the step:

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

| 2  7  1   |  8      9      6    | *34    *35  45   |

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

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

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

| 4  8  79  | *1679   567   *1359 | *139    2   567  |

| 6  3  279 |  12479  4578   1259 |  1489  *15  4578 |

| 5  1  279 |  24679  4678   239  |  3489  *36  4678 |

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

| 3  9  5   |  1246   46     12   |  18     7   68   |

| 7  2  4   | *16     3      8    |  5     *16  9    |

| 1  6  8   |  79     57     59   |  2      4   3    |

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



Forcing Chain Verity => r1c7=4

  r4c4=1 r8c4=6 r6c8=6 r1c8=3 r1c7=4

  r4c6=1 r4c7=3 r1c7=4

  r4c7=1 r5c8=5 r1c8=3 r1c7=4