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May 20 VH

 
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Clement



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

PostPosted: Sun May 19, 2013 10:47 pm    Post subject: May 20 VH Reply with quote

Code:

+--------------+----------+-------------+
| 25   59  8   | 69 4 1   | 7  3   26   |
| 4    6   3   | 8  2 7   | 9  5   1    |
| 127  179 17  | 5  3 69  | *48 26  *48   |
+--------------+----------+-------------+
| 9    13  16  | 4  5 36  | 2  8   7    |
| 78   378 5   | 2  1 38  | 6  4   9    |
| 68   2   4   | 69 7 689 | 5  1   3    |
+--------------+----------+-------------+
| 1678 178 167 | 3  9 5   | *48 267 *2468 |
| 3    58  2   | 7  6 4   | 1  9   58   |
| 567  4   9   | 1  8 2   | 3  67  56   |
+--------------+----------+-------------+
Type 1 UR 48 in Grid r37c79; r7c9<>48 solves it.
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roaa



Joined: 18 Apr 2009
Posts: 80
Location: Sweden

PostPosted: Mon May 20, 2013 8:09 am    Post subject: Reply with quote

I used an xy-wing (256) forcing r9c1 <> 5 giving r8c2 = 8 which solves it.
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Marty R.



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

PostPosted: Mon May 20, 2013 3:11 pm    Post subject: Reply with quote

roaa wrote:
I used an xy-wing (256) forcing r9c1 <> 5 giving r8c2 = 8 which solves it.


I used the same move, but r8c2=5, not 8, since it's the only 5 left after the XY-Wing elimination.
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RobertRattley



Joined: 24 Jun 2007
Posts: 58
Location: Australia

PostPosted: Tue May 21, 2013 2:22 am    Post subject: Reply with quote

I, who take inordinate pleasure in secondary matters, was delighted to find that no fewer than 7 "sole candidate"s seemed to be necessary during the preliminaries (and more than 7 were available).

And, just to be slightly different: the xy-wing elimination settles the 5 in row 9 and that solves it.
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