HoDoKu Solving Technique Index: Example for "Alternate Inference Chain Type 1"

Solving Technique Example

Original sudoku:

.......69.8..2.13..1......4..........4...9.7..671.29....1....8.3..........867.2.5

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

:0708:5:+2......69+98..2.13+7+71.....+24..+9....+5..4...9.7.+5671+329+4+8+6.1....8+33......+9+6+4+9867+32+15::513 523 533 572 582:

The following representation can be pasted in most Sudoku programs:

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

| 2   35   345 | 34578  1458  14578 | 58  6  9  |

| 9   8    456 | 45     2     456   | 1   3  7  |

| 7   1    356 | 3589   5689  568   | 58  2  4  |

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

| 18  23   9   | 478    468   4678  | 36  5  12 |

| 18  4    23  | 58     568   9     | 36  7  12 |

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

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

| 6   257  1   | 2459   459   45    | 47  8  3  |

| 3   257  25  | 2458   1458  1458  | 47  9  6  |

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

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

Representation of the step:

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

| 2   *35     34-5 | *34578  1458  14578 | 58  6  9  |

| 9    8      4-56 |  45     2     456   | 1   3  7  |

| 7    1      3-56 | *3589   5689  568   | 58  2  4  |

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

| 18   23     9    |  478    468   4678  | 36  5  12 |

| 18   4      23   |  58     568   9     | 36  7  12 |

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

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

| 6   *2-57   1    | *2459   459   45    | 47  8  3  |

| 3    2-57  *25   |  2458   1458  1458  | 47  9  6  |

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

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



AIC 5- r1c2 -3- r1c4 =3= r3c4 =9= r7c4 =2= r7c2 -2- r8c3 -5 => r123c3,r78c2<>5