Solving Sudoku
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Saved by 14 people (-9 private), first by anonymouse user on 2006-04-24
- Celticcarrie on 2008-04-21 - Tags Links
- Wiztwas on 2008-04-20 - Tags Links
- Dustinwindsor on 2008-03-02 - Tags ENTERTAINMENT-Sudoku
- Kellner on 2007-09-30 - Tags Tibet , today , sudoku
- Kellnerb on 2007-09-30 - Tags Tibet , today , sudoku
Public Sticky notes
A Naked Triple occurs when three cells in a group contain no candidates other that the same three candidates. The cells which make up a Naked Triple don't have to contain every candidate of the triple. If these candidates are found in other cells in the group they can be excluded.
Highlighted by chrisdedavid
A Naked Quad occurs when four cells in a group contain no candidates other that the same four candidates.
Highlighted by chrisdedavid
If two cells in a group contain a pair of candidates (hidden amongst other candidates) that are not found in any other cells in that group, then other candidates in those two cells can be excluded safely.
Highlighted by chrisdedavid
If three candidates are restricted to three cells in a given group, then all other candidates in those three cells can be excluded.
In the example below, the candidates 3, 6 and 7 are found only in column four, six and seven. Therefore, all other candidates can be excluded from those three cells.
In the example below, the candidates 3, 6 and 7 are found only in column four, six and seven. Therefore, all other candidates can be excluded from those three cells.
Highlighted by chrisdedavid
If four candidates are restricted to four cells in a given group, then all other candidates in those four cells can be excluded.
Hidden Quads are very rare, which is fortunate since they're almost impossible to spot even when you know they're there.
Hidden Quads are very rare, which is fortunate since they're almost impossible to spot even when you know they're there.
Highlighted by chrisdedavid
Therefore, any cells which share a group with both these branches can safely have candidate 5 excluded (ie cells R1C6 & R9C5 as illustrated).
Highlighted by chrisdedavid
Fill in all blank cells making sure that each row, column and 3 by 3 box contains the numbers 1 to 9.
Highlighted by zemoxian
Public Comment
on 2006-10-14 by wd5gnr
on 2006-11-03 by pistos