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Sep 20 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 686
Location: Dar es Salaam Tanzania

PostPosted: Mon Sep 19, 2011 11:37 pm    Post subject: Sep 20 VH Reply with quote

I used two XY-Wings:-
XY-Wing 69 29 26 pivoted in r2c9 sets r4c7<>6 leads to
XY-Wing 27 47 24 pivoted in r4c6 setting r4c4<>2; r6c7<>2 which solves it.
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hughwill



Joined: 05 Apr 2010
Posts: 227
Location: Birmingham UK

PostPosted: Tue Sep 20, 2011 4:58 pm    Post subject: Sep 20 VH Reply with quote

Did I do something wrong? This one came out for me with basics only.....
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Marty R.



Joined: 12 Feb 2006
Posts: 5178
Location: Rochester, NY, USA

PostPosted: Tue Sep 20, 2011 5:10 pm    Post subject: Re: Sep 20 VH Reply with quote

hughwill wrote:
Did I do something wrong? This one came out for me with basics only.....

You may very well be correct, but it's usually a good idea to try it again when this happens, just to be sure. On my first pass it was basics only, but on the 2nd try I used the same two wings that Clement did.
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keith



Joined: 19 Sep 2005
Posts: 3184
Location: near Detroit, Michigan, USA

PostPosted: Wed Sep 21, 2011 2:00 am    Post subject: Reply with quote

After basics:
Code:
+-------------+-------------+-------------+
| 3   7   2   | 4   1   89  | 69  68  5   |
| 5   6   4   | 3   7   89  | 1   28  29  |
| 8   9   1   | 5   2   6   | 7   3   4   |
+-------------+-------------+-------------+
| 1   8   9   | 267 5   47  | 246 267 3   |
| 4   23  7   | 9   36  1   | 8   5   26  |
| 6   235 35  | 27  8   347 | 249 1   279 |
+-------------+-------------+-------------+
| 7   35  6   | 8   9   2   | 35  4   1   |
| 9   4   8   | 1   36  5   | 236 267 267 |
| 2   1   35  | 67  4   37  | 356 9   8   |
+-------------+-------------+-------------+
Sudoku Susser says two X-wings and two XY-wings, but they are probably not all necessary.

Keith
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Jeff



Joined: 06 May 2007
Posts: 34

PostPosted: Thu Sep 22, 2011 12:22 am    Post subject: Reply with quote

I executed the two XY wings described above, but I can't seem to solve the puzzle. Here is what I get after the two XY wings plus removing a 6 from R8C8 and R8C7 (X wing). I don't seem to be able to finish it up. Could someone please bail me out before I go nuts. Many thanks,

Code:

+----------+------------+-------------+
| 3 7   2  | 4   1  89  | 69  68  5   |
| 5 6   4  | 3   7  89  | 1   28  29  |
| 8 9   1  | 5   2  6   | 7   3   4   |
+----------+------------+-------------+
| 1 8   9  | 267 5  47  | 24  267 3   |
| 4 23  7  | 9   36 1   | 8   5   26  |
| 6 235 35 | 27  8  347 | 49  1   79  |
+----------+------------+-------------+
| 7 35  6  | 8   9  2   | 35  4   1   |
| 9 4   8  | 1   36 5   | 23  27  267 |
| 2 1   35 | 67  4  37  | 356 9   8   |
+----------+------------+-------------+
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Marty R.



Joined: 12 Feb 2006
Posts: 5178
Location: Rochester, NY, USA

PostPosted: Thu Sep 22, 2011 12:35 am    Post subject: Reply with quote

Jeff, it looks like on the 472 XY-Wing, you missed deleting the 2 from r4c4. Hope this helps you retain your sanity.
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Jeff



Joined: 06 May 2007
Posts: 34

PostPosted: Thu Sep 22, 2011 12:57 am    Post subject: Reply with quote

Marty,

Thanks. I will now be able to regain my sanity,

Jeff
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