HoDoKu Solving Technique Index: Example for "Grouped Alternate Inference Chain Type 2"

Solving Technique Example

Original sudoku:

....5.76.7.5.....3....86.2...43.......6.9.14.....2...........5...7.6...2839......

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

:0711:14:+2...5+376.7+65.....3..+3+786.2...43..+2.+6+3+26.9.14....+62+4...+6.+2.+3..5...7.6...2839...+6..:819 141 142 746 769 584 586 194 494 196 796 799:125 414:

The following representation can be pasted in most Sudoku programs:

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

| 2    1489   18 | 149   5    3    | 7     6     149   |

| 7    6      5  | 1249  14   129  | 489   189   3     |

| 149  149    3  | 7     8    6    | 459   2     1459  |

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

| 59   5789   4  | 3     17   158  | 2     789   6     |

| 3    2      6  | 58    9    578  | 1     4     578   |

| 159  15789  18 | 6     2    4    | 3589  3789  589   |

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

| 6    14     2  | 1489  3    1789 | 489   5     14789 |

| 145  145    7  | 1489  6    189  | 3489  1389  2     |

| 8    3      9  | 25    147  25   | 6     17    14    |

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

Representation of the step:

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

| 2    1489   18 | *1-49   5     3    | 7      6      149   |

| 7    6      5  | *1249  *-14  *129  | 489   *189    3     |

| 149  149    3  |  7      8     6    | 459    2      1459  |

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

| 59   5789   4  |  3      17    158  | 2      789    6     |

| 3    2      6  |  58     9     578  | 1      4      578   |

| 159  15789  18 |  6      2     4    | 3589   3789   589   |

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

| 6    14     2  |  1489   3     1789 | 489    5      14789 |

| 145  145    7  |  1489   6     189  | 3489  *1389   2     |

| 8    3      9  |  25    *147   25   | 6     *17    *14    |

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



Grouped AIC 4- r2c5 =4= r9c5 -4- r9c9 -1- r89c8 =1= r2c8 -1- r2c456 =1= r1c4 -1 => r2c5<>1, r1c4<>4