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help please stumped for days

 
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Pandor



Joined: 25 Dec 2011
Posts: 2

PostPosted: Sun Dec 25, 2011 5:32 pm    Post subject: help please stumped for days Reply with quote

Which number is next and why? Thanks.

http://imageshack.us/photo/my-images/819/sudokuq.jpg/
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Marty R.



Joined: 12 Feb 2006
Posts: 5176
Location: Rochester, NY, USA

PostPosted: Sun Dec 25, 2011 6:05 pm    Post subject: Reply with quote

By filling in the unsolved cells with the possible candidates, the next steps to be taken should be evident. On the other hand, you may like to do puzzles without those possible candidates filled in.

Code:

+-----------+--------------------+-------------+
| 49  46  2 | 8      7     13469 | 369  16 5   |
| 1   3   5 | 269    26    269   | 4    8  7   |
| 479 467 8 | 123469 12346 5     | 2369 16 123 |
+-----------+--------------------+-------------+
| 2   5   6 | 39     8     39    | 1    7  4   |
| 47  47  1 | 2456   2456  246   | 8    3  9   |
| 8   9   3 | 14     14    7     | 5    2  6   |
+-----------+--------------------+-------------+
| 3   8   9 | 7      1246  1246  | 26   5  12  |
| 6   1   4 | 235    235   23    | 7    9  8   |
| 5   2   7 | 136    9     8     | 36   4  13  |
+-----------+--------------------+-------------+

Play this puzzle online at the Daily Sudoku site
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Sun Dec 25, 2011 6:28 pm    Post subject: Reply with quote

Using Marty's grid:

*) the <47> Naked Pair in r5c12 eliminates <4> in r5c456.

*) a <14> Hidden Pair in r17c6 eliminates <3,6,9> in r1c6 and <2,6> in r7c6.

*) a Hidden Single on <3> remains in r1c7 to crack the puzzle.

Merry Christmas, Danny A. Jones
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Pandor



Joined: 25 Dec 2011
Posts: 2

PostPosted: Mon Dec 26, 2011 5:54 am    Post subject: Reply with quote

Smile


Thank you!
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