HoDoKu Solving Technique Index: Example for "Dual Empty Rectangle"
Original sudoku:
47...........2...78..5..34..6..7..8...9.45..3.8......2741..32............9.2...5.
Use the following line if you want to load the sudoku in HoDoKu:
:0402:9:47.....+2.+9+3.+42...78+1+25.+734.+36+4.7+2.8.+1+29+845+6+73+58+7...+4.2741.+532.+8+2+5+8+7...+3.+69+32..+75.::968 974:
The following representation can be pasted in most Sudoku programs:
.----------.-------------------.----------------. | 4 7 56 | 1369 13689 1689 | 1589 2 1569 | | 9 3 56 | 4 2 168 | 158 16 7 | | 8 1 2 | 5 69 7 | 3 4 69 | :----------+-------------------+----------------: | 3 6 4 | 19 7 2 | 159 8 159 | | 1 2 9 | 8 4 5 | 6 7 3 | | 5 8 7 | 1369 1369 169 | 4 19 2 | :----------+-------------------+----------------: | 7 4 1 | 69 5 3 | 2 69 8 | | 2 5 8 | 7 169 1469 | 19 3 1469 | | 6 9 3 | 2 18 148 | 7 5 14 | '----------'-------------------'----------------'
Representation of the step:
.----------.--------------------.------------------. | 4 7 56 | 1369 13689 1689 | 1589 2 1569 | | 9 3 56 | 4 2 168 | 158 16 7 | | 8 1 2 | 5 69 7 | 3 4 69 | :----------+--------------------+------------------: | 3 6 4 | 19 7 2 | 159 8 159 | | 1 2 9 | 8 4 5 | 6 7 3 | | 5 8 7 | 1369 1369 169 | 4 *1-9 2 | :----------+--------------------+------------------: | 7 4 1 | *6-9 5 3 | 2 *69 8 | | 2 5 8 | 7 169 1469 | 19 3 1469 | | 6 9 3 | 2 18 148 | 7 5 14 | '----------'--------------------'------------------' Dual Empty Rectangle: 9 in b5 (r67c8/r7c48) => r6c8,r7c4<>9
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