HoDoKu Solving Technique Index: Example for "Naked Quadruple"

Solving Technique Example

Original sudoku:

.......6.....3..47.325.....6....7..52.7.1.9.8.81..4........2...........1..587....

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

:0202:389:.+1.+7+2.+56+3.+5+6.3.+247+7325+4+6+1+8+96+9+3+2+87+4+152+47+61+59+38+581+3+94........2...........1..587....::387 887 988:

The following representation can be pasted in most Sudoku programs:

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

| 489    1    489 | 7    2   89  | 5     6     3   |

| 89     5    6   | 19   3   189 | 2     4     7   |

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

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

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

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

| 5      8    1   | 3    9   4   | 67    27    26  |

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

| 13489  67   489 | 149  56  2   | 3678  579   46  |

| 3489   267  489 | 49   56  39  | 3678  2579  1   |

| 1349   26   5   | 8    7   139 | 36    29    246 |

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

Representation of the step:

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

|  489    1     489 |  7    2    89  |  5      6      3   |

|  89     5     6   |  19   3    189 |  2      4      7   |

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

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

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

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

|  5      8     1   |  3    9    4   |  67     27     26  |

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

|  13489  67    489 |  149  56   2   |  3678   579    46  |

| *3489   267  *489 | *49   56  *39  | -367-8  257-9  1   |

|  1349   26    5   |  8    7    139 |  36     29     246 |

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



Naked Quadruple: 3,4,8,9 in r8c1346 => r8c7<>3, r8c7<>8, r8c8<>9