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VH Jan 3

 
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roaa



Joined: 18 Apr 2009
Posts: 72
Location: Sweden

PostPosted: Thu Jan 03, 2013 8:51 am    Post subject: VH Jan 3 Reply with quote

An xy-wing (179) pivoted at r9c3 solves it. A hidden pair (26) is not needed to use.
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hughwill



Joined: 05 Apr 2010
Posts: 172
Location: Birmingham UK

PostPosted: Thu Jan 03, 2013 10:01 am    Post subject: VH Jan 3 Reply with quote

After basics:

Code:

+---------------+--------------+--------------+
| 168 9    5    | 1348 124  7  | 28  136 1246 |
| 7   1468 14   | 1348 1249 29 | 5   136 1246 |
| 3   148  2    | 148  5    6  | 789 179 1479 |
+---------------+--------------+--------------+
| 15  15   6    | 7    3    29 | 29  4   8    |
| 29  3    8    | 5    29   4  | 1   67  67   |
| 4   27   79   | 6    8    1  | 3   5   29   |
+---------------+--------------+--------------+
| 19  147  1479 | 2    17   5  | 6   8   3    |
| 26  26   3    | 14   147  8  | 79  179 5    |
| 58  58   17   | 9    6    3  | 4   2   17   |
+---------------+--------------+--------------+

Play this puzzle online at the Daily Sudoku site
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Mindwarp



Joined: 13 Sep 2007
Posts: 25
Location: St. Ives, England

PostPosted: Thu Jan 03, 2013 10:20 pm    Post subject: Reply with quote

I didn't find anything hard about this one took me 5 minute 55 second using sweep
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keith



Joined: 19 Sep 2005
Posts: 3165
Location: near Detroit, Michigan, USA

PostPosted: Thu Jan 03, 2013 10:32 pm    Post subject: Reply with quote

Mindwarp wrote:
I didn't find anything hard about this one took me 5 minute 55 second using sweep

If you'd like something little harder, try the "Other Puzzles".

If you'd like options for much harder puzzles, try Danny's DAJ puzzles.

No one will mind if you want to reopen a discussion on any of these.

Keith
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Mindwarp



Joined: 13 Sep 2007
Posts: 25
Location: St. Ives, England

PostPosted: Fri Jan 04, 2013 4:34 am    Post subject: Reply with quote

Sometimes I find them easy sometimes I find them impossible, this particular puzzle just didn't appear to need anything special to solve it. Normally a VH takes me just over 9 minutes to solve when I can do them. I suspect the one I can't solve are ones that involve techniques I haven't learnt.
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Marty R.



Joined: 12 Feb 2006
Posts: 5160
Location: Rochester, NY, USA

PostPosted: Fri Jan 04, 2013 4:44 am    Post subject: Reply with quote

Mindwarp wrote:
Sometimes I find them easy sometimes I find them impossible, this particular puzzle just didn't appear to need anything special to solve it. Normally a VH takes me just over 9 minutes to solve when I can do them. I suspect the one I can't solve are ones that involve techniques I haven't learnt.


All VH puzzles here can be solved with nothing more than X-, XY- and XYZ-Wings.
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Mindwarp



Joined: 13 Sep 2007
Posts: 25
Location: St. Ives, England

PostPosted: Fri Jan 04, 2013 4:47 am    Post subject: Reply with quote

I probably just haven't spotted them ten when i haven't been able to do them. Jan 4's medium puzzle took longer than Jan 3's VH by nearly a minute. I guess it just depends whether you see the key to solving the puzzles.
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Clement



Joined: 24 Apr 2006
Posts: 667
Location: Dar es Salaam Tanzania

PostPosted: Fri Jan 04, 2013 5:02 pm    Post subject: Jan 3 VH Reply with quote

Mindwarp
I came with the same Grid as shown by Hughwill above. As you have pointed out ''This particular puzzle didn't need anything special to solve it". Do you mean you solved it from basics only(sweeping)? Can you show how you did it.
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