HoDoKu Solving Technique Index: Example for "Naked Pair"

Solving Technique Example

Original sudoku:

..7..4.2......26...4..56.7831.....4..6....3..........1.96..1...2......57.......6.

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

:0200:89:+6+87..4+52+3+9+5+3..26+1+4+14+2+356+97831...+7+24+6+76....3.+5.+2....+7.1.96..1.+3+22+3.....57.+7.....6+9::844 854 855 864 865 866 944 954 955 964 965 966:

The following representation can be pasted in most Sudoku programs:

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

| 6    8  7    | 19     19     4    | 5    2   3 |

| 9    5  3    | 78     78     2    | 6    1   4 |

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

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

| 3    1  589  | 589    89     7    | 2    4   6 |

| 7    6  489  | 12489  12489  89   | 3    89  5 |

| 458  2  4589 | 45689  34689  3589 | 7    89  1 |

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

| 458  9  6    | 4578   478    1    | 48   3   2 |

| 2    3  148  | 4689   4689   89   | 148  5   7 |

| 458  7  1458 | 2458   2348   358  | 148  6   9 |

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

Representation of the step:

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

| 6    8  7    | 19        19        4      | 5    2   3 |

| 9    5  3    | 78        78        2      | 6    1   4 |

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

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

| 3    1  589  | 5-8-9    *89        7      | 2    4   6 |

| 7    6  489  | 124-8-9   124-8-9  *89     | 3    89  5 |

| 458  2  4589 | 456-8-9   346-8-9   35-8-9 | 7    89  1 |

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

| 458  9  6    | 4578      478       1      | 48   3   2 |

| 2    3  148  | 4689      4689      89     | 148  5   7 |

| 458  7  1458 | 2458      2348      358    | 148  6   9 |

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



Naked Pair: 8,9 in r4c5,r5c6 => r456c4,r56c5,r6c6<>8, r456c4,r56c5,r6c6<>9