HoDoKu Solving Technique Index: Example for "Dual Empty Rectangle"

Solving Technique Example

Original sudoku:

5.......3.....897.697.5...........287.3.1..........1....9..1357..8765......49....

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

:0402:2:5+8.+1+7+9..3...+6.897+5697+35....+9..+5+3.+7287.3+81.+5..+8+5.+9.+71+3.+4+69+2+81357..8765....+7+549+3...:222:225 263:

The following representation can be pasted in most Sudoku programs:

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

| 5    8    24  | 1  7   9   | 246  46   3    |

| 123  134  124 | 6  24  8   | 9    7    5    |

| 6    9    7   | 3  5   24  | 248  148  124  |

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

| 9    14   146 | 5  3   46  | 7    2    8    |

| 7    24   3   | 8  1   246 | 5    469  469  |

| 8    5    246 | 9  24  7   | 1    3    46   |

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

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

| 123  123  8   | 7  6   5   | 24   149  1249 |

| 12   7    5   | 4  9   3   | 268  168  126  |

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

Representation of the step:

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

| 5    8     24   | 1   7    9   | 246  46   3    |

| 123  134   124  | 6  *-24  8   | 9    7    5    |

| 6    9     7    | 3   5    24  | 248  148  124  |

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

| 9    14    146  | 5   3    46  | 7    2    8    |

| 7    24    3    | 8   1    246 | 5    469  469  |

| 8    5    *-246 | 9  *24   7   | 1    3    46   |

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

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

| 123  123   8    | 7   6    5   | 24   149  1249 |

| 12   7     5    | 4   9    3   | 268  168  126  |

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



Dual Empty Rectangle: 2 in b1 (r26c5/r6c35) => r2c5,r6c3<>2