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Fri dec 7 hard

 
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lg161



Joined: 17 Oct 2006
Posts: 9

PostPosted: Sat Dec 08, 2012 8:46 pm    Post subject: Fri dec 7 hard Reply with quote

I can do the VH puzzles but I'm stuck here. R7 c5 is supposed to be 9. Why??
Help!
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Marty R.



Joined: 12 Feb 2006
Posts: 5063
Location: Rochester, NY, USA

PostPosted: Sat Dec 08, 2012 10:25 pm    Post subject: Reply with quote

Can you post the grid where you're stuck at? I tried it and got to a point where there was a 123 triple in column 5, thus precluding other 1s in that column.
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lg161



Joined: 17 Oct 2006
Posts: 9

PostPosted: Sun Dec 09, 2012 2:32 am    Post subject: Dec 7 h Reply with quote

I don't know how to post a grid, but in col 5 I have
12
7
239
6
13
8
19
5
4

Does that help you?
Thank you Marty!
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Marty R.



Joined: 12 Feb 2006
Posts: 5063
Location: Rochester, NY, USA

PostPosted: Sun Dec 09, 2012 2:39 am    Post subject: Reply with quote

No, that by itself doesn't help. This is an article I wrote some years ago about how to post an aligned grid.

http://www.dailysudoku.co.uk/sudoku/forums/viewtopic.php?t=1905
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lg161



Joined: 17 Oct 2006
Posts: 9

PostPosted: Sun Dec 09, 2012 3:12 am    Post subject: dec 7 hard Reply with quote

Is this better?
+-----------+---------------+---------------+
| 9 12 7 | 5 12 6 | 8 4 3 |
| 5 138 4 |138 7 189 | 2 6 19 |
| 6 1238 18 | 4 12389 189 | 179 1579 1579 |
+-----------+---------------+---------------+
| 2 17 5 | 9 6 4 | 17 3 8 |
| 8 179 6 | 123 123 5 | 4 179 1279 |
| 3 4 19 | 128 128 7 | 6 159 1259 |
+-----------+---------------+---------------+
| 4 5 89 | 6 189 2 | 3 1789 179 |
| 7 6 3 | 18 5 189 | 19 2 4 |
| 1 89 2 | 7 4 3 | 5 89 6 |
+-----------+---------------+---------------+
[/code]
Play this puzzle online at the Daily Sudoku site
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Marty R.



Joined: 12 Feb 2006
Posts: 5063
Location: Rochester, NY, USA

PostPosted: Sun Dec 09, 2012 5:23 am    Post subject: Reply with quote

I aligned the grid.

Code:
+------------+---------------+---------------+
| 9 12    7  | 5   12    6   | 8   4    3    |
| 5 138   4  | 138 7     189 | 2   6    19   |
| 6 1238  18 | 4   12389 189 | 179 1579 1579 |
+------------+---------------+---------------+
| 2 17    5  | 9   6     4   | 17  3    8    |
| 8 179   6  | 123 123   5   | 4   179  1279 |
| 3 4     19 | 128 128   7   | 6   159  1259 |
+------------+---------------+---------------+
| 4 5     89 | 6   189   2   | 3   1789 179  |
| 7 6     3  | 18  5     189 | 19  2    4    |
| 1 89    2  | 7   4     3   | 5   89   6    |
+------------+---------------+---------------+


I assume you're familiar with Locked Candidates. Let's remove the 8 from r7c5 because the only 8s in row 8 are in that box. Let's remove the 2s from rows 56 column 5 because the only 2s in column 4 are in that box. Now look at row 3. There is a quintuple, 15789, so those numbers are removed from the other cells in that row. After doing those moves I think you'll see why the hint is what it is. Good luck and don't hesitate if you have further questions.

Marty
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lg161



Joined: 17 Oct 2006
Posts: 9

PostPosted: Sun Dec 09, 2012 12:33 pm    Post subject: Dec 7 hard Reply with quote

Omg Marty, of course! Give me an xywing any day. Those I can see. I can't thank you enough for your help.
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Pat



Joined: 23 Feb 2010
Posts: 162

PostPosted: Mon Dec 10, 2012 8:14 am    Post subject: Reply with quote


    actually it is a 1-move puzzle

    r3 "hidden" duo {2,3} ( or "naked" quintet )
    solves c5 9
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