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Stumped

 
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Earl



Joined: 30 May 2007
Posts: 546
Location: St Louis MO

PostPosted: Thu Jun 28, 2007 1:32 pm    Post subject: Stumped Reply with quote

Can any one see a possible next move on this puzzle?
The "Hint" under "play/show" says "too difficult."

Earl

Code:

+-------+-------+-------+
| . 2 4 | 3 . 9 | 1 . . |
| 3 8 . | 4 1 . | . 9 2 |
| . 1 9 | . . 5 | . . 4 |
+-------+-------+-------+
| 9 7 . | . . 1 | . 4 . |
| 1 5 . | 8 . 4 | . 7 6 |
| . 4 . | 7 . 2 | . 1 3 |
+-------+-------+-------+
| 4 3 . | 9 . . | . 2 . |
| 2 6 . | . 4 . | . . 9 |
| . 9 7 | . . 3 | 4 6 . |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site
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Myth Jellies



Joined: 27 Jun 2006
Posts: 64

PostPosted: Thu Jun 28, 2007 3:05 pm    Post subject: Reply with quote

An X-wing on 7's, then in one of the affected columns lurks a hidden triple.
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TKiel



Joined: 22 Feb 2006
Posts: 292
Location: Kalamazoo, MI

PostPosted: Thu Jun 28, 2007 10:26 pm    Post subject: Reply with quote

Or, with a nod to the thread about complementary sets and different ways of seeing things, a naked quad.
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Earl



Joined: 30 May 2007
Posts: 546
Location: St Louis MO

PostPosted: Fri Jun 29, 2007 2:19 am    Post subject: Stumped Reply with quote

Thanks for the hep.
I got his far.
Any further help?

Earl

Code:

+-----------+-------------+---------------+
| 567 2 4   | 3   678  9  | 1    58  578  |
| 3   8 56  | 4   1    67 | 567  9   2    |
| 67  1 9   | 26  2678 5  | 368  38  4    |
+-----------+-------------+---------------+
| 9   7 23  | 56  356  1  | 258  4   58   |
| 1   5 23  | 8   39   4  | 29   7   6    |
| 68  4 68  | 7   59   2  | 59   1   3    |
+-----------+-------------+---------------+
| 4   3 158 | 9   67   68 | 58   2   1578 |
| 2   6 158 | 15  4    78 | 3578 358 9    |
| 58  9 7   | 125 25   3  | 4    6   158  |
+-----------+-------------+---------------+

Play this puzzle online at the Daily Sudoku site
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Marty R.



Joined: 12 Feb 2006
Posts: 5124
Location: Rochester, NY, USA

PostPosted: Fri Jun 29, 2007 4:28 am    Post subject: Re: Stumped Reply with quote

Earl wrote:
Thanks for the hep.
I got his far.
Any further help?

Earl

Code:

+-----------+-------------+---------------+
| 567 2 4   | 3   678  9  | 1    58  578  |
| 3   8 56  | 4   1    67 | 567  9   2    |
| 67  1 9   | 26  2678 5  | 368  38  4    |
+-----------+-------------+---------------+
| 9   7 23  | 56  356  1  | 258  4   58   |
| 1   5 23  | 8   39   4  | 29   7   6    |
| 68  4 68  | 7   59   2  | 59   1   3    |
+-----------+-------------+---------------+
| 4   3 158 | 9   67   68 | 58   2   1578 |
| 2   6 158 | 15  4    78 | 3578 358 9    |
| 58  9 7   | 125 25   3  | 4    6   158  |
+-----------+-------------+---------------+

Play this puzzle online at the Daily Sudoku site


There's a skyscraper on 5 in columns 1 and 8 which will take out a 5 in boxes 7 and 9. That exposes a 185 XY-Wing based in r8c3 and a W-Wing on the 18s in boxes 7 and 9.
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Mogulmeister



Joined: 03 May 2007
Posts: 695

PostPosted: Fri Jun 29, 2007 6:27 am    Post subject: Complement Reply with quote

Earl just in case you missed it first time, you need to look at Myth's Hidden Triple or the easier to see naked quad (column 7) which is, as Tracy points out, the complement of the hidden triple.

The quad contains {2,5,8,9} which makes other eliminations in column 7 which will leave a single 5 in row 2 and after that it is easy.
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Earl



Joined: 30 May 2007
Posts: 546
Location: St Louis MO

PostPosted: Fri Jun 29, 2007 3:56 pm    Post subject: stumpted Reply with quote

Thanks for all the help.

I also found a w-wing of 67's in boxes 1 and 2.

And "Hint" said it was too difficult.

Not for you guys.

Earl
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