UR elimination

Advanced methods and approaches for solving Sudoku puzzles

UR elimination

Postby wapati » Tue Dec 12, 2006 7:38 am

I was using a solver to step thorough a puzzle and came to
this position, almost. Said solver does not export candidates
so this grid may not be too valid, BUT, the cells marked with
# signs, do they allow the removal of digit 5 from R6 C7?

Code: Select all
.------------------.------------------.------------------.
| 1     9     8    | 6     7     34   | 34    5     2    |
| 7     245   6    | 25    235   9    | 134   18    348  |
| 45    245   3    | 125   8     124  | 67    9     67   |
:------------------+------------------+------------------:
| 9     6    #57   | 28    4     238  |#57    23    1    |
| 2     1     4    | 7     36    5    | 9     368   38   |
| 3     8    #57   | 9     1     26   |#25    4     67   |
:------------------+------------------+------------------:
| 56    7     12   | 12458 9     1268 | 12346 123   34   |
| 456   45    12   | 3     56    12   | 8     7     9    |
| 8     3     9    | 124   26    7    | 1246  126   5    |
'------------------'------------------'------------------'
wapati
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Postby RW » Tue Dec 12, 2006 8:28 am

Yes, it's a perfectly valid UR+1. The fact that digit 7 already is removed by anoher UR doesn't change this.

RW
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Postby wapati » Wed Dec 13, 2006 6:11 am

Thanks RW.
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