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Jun 23 VH

 
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kuskey



Joined: 10 Dec 2008
Posts: 127
Location: Pembroke, NH

PostPosted: Mon Jun 23, 2014 4:52 am    Post subject: Jun 23 VH Reply with quote

Using basic tools, all I found was a 358 xy-wing rsc2 pivot setting r6c1<>8 and r5c6<>8. Lots of pairs to check.
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Marty R.



Joined: 12 Feb 2006
Posts: 5162
Location: Rochester, NY, USA

PostPosted: Mon Jun 23, 2014 4:56 am    Post subject: Reply with quote

Code:

+-----------+------------+---------+
| 3   7  2  | 8   1  6   | 4  5  9 |
| 1   8  4  | 35  9  35  | 6  7  2 |
| 6   9  5  | 2   7  4   | 1  3  8 |
+-----------+------------+---------+
| 589 2  7  | 6   4  589 | 3  89 1 |
| 4   6  38 | 1   2  389 | 7  89 5 |
| 589 35 1  | 359 58 7   | 2  6  4 |
+-----------+------------+---------+
| 7   35 38 | 4   58 2   | 9  1  6 |
| 2   1  6  | 59  3  589 | 58 4  7 |
| 58  4  9  | 7   6  1   | 58 2  3 |
+-----------+------------+---------+

Play this puzzle online at the Daily Sudoku site

Same.
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rmireland



Joined: 21 Sep 2013
Posts: 15
Location: New Orleans

PostPosted: Mon Jun 23, 2014 10:50 pm    Post subject: Reply with quote

Interesting puzzle in that the only elimination (other than sweeping) is this XY, and then only for the 8 in R6C1. (There is an X-wing on 5 in C25 but it leads nowhere.) All other values are set because only possible choices in rows, columns, boxes and squares. I think that if this puzzle did not have the XY, then it would be rated as Easy.
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Lee



Joined: 10 Jun 2014
Posts: 6
Location: San Francisco

PostPosted: Tue Jun 24, 2014 2:23 am    Post subject: Reply with quote

rmireland expressed my sentiments so I looked for any other way to solve this puzzle. I did come up with a nice loop which dodges around the xy wing. I hope I didn't make any mistakes.

r6c1=9=r6c4-9-r8c4-5-r7c5=5=r7c2-5-r6c2-3-r5c3-8-r6c1

therefore r6c1<>8

same elimination as with the xy wing but a lot more work
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arkietech



Joined: 31 Jul 2008
Posts: 1725
Location: Northwest Arkansas USA

PostPosted: Tue Jun 24, 2014 11:10 am    Post subject: Reply with quote

A skyscraper on 8 sets r5c3 to 3 and r9c1 to 5 solving the puzzle.
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