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Apr 12 VH

 
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RobertRattley



Joined: 24 Jun 2007
Posts: 57
Location: Australia

PostPosted: Thu Apr 11, 2013 10:11 pm    Post subject: Apr 12 VH Reply with quote

OK: for once, Australia beats Tanzania.

But I won't spell it out. Just my summary.

One step, xy wing.

I enjoyed this puzzle. I needed intermediate-to-hard steps both before and after the xy wing.

I'll let somebody else reveal a fuller solution and I look forward to seeing what alternatives others may find.
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Clement



Joined: 24 Apr 2006
Posts: 684
Location: Dar es Salaam Tanzania

PostPosted: Thu Apr 11, 2013 11:04 pm    Post subject: Apr 12 VH Reply with quote

RobertRattley,
O.K. Congratulations.
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Marty R.



Joined: 12 Feb 2006
Posts: 5164
Location: Rochester, NY, USA

PostPosted: Fri Apr 12, 2013 1:02 am    Post subject: Reply with quote

Same as you Robert, an XY-Wing. What made this puzzle different from most is that there were a lot of numbers in the grid. I screwed up with pencil and paper and had to do it on Draw/Play to see if I had a wrong grid or made a mechanical error. As it turned out I had the right grid but erred on the remaining basics after playing the XY-Wing.
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kuskey



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

PostPosted: Fri Apr 12, 2013 5:06 am    Post subject: Apr 12 VH Reply with quote

A 125 xyz wing contered at r6c1 sets r6c3<>2 yielding a solution after some rather nice cleanup. Some would argue the use of an xyz as a VH tool, I guess.
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hughwill



Joined: 05 Apr 2010
Posts: 214
Location: Birmingham UK

PostPosted: Fri Apr 12, 2013 9:24 am    Post subject: Reply with quote

These were my basics...they didn't seem to go very far today.....

Code:

+-----------+--------------------+-----------------+
| 7   4  59 | 23589  2389  2358  | 6     139  139  |
| 6   2  1  | 7      349   34    | 39    5    8    |
| 3   8  59 | 569    1     56    | 4     2    7    |
+-----------+--------------------+-----------------+
| 25  9  8  | 1      235   7     | 23    6    4    |
| 4   16 7  | 2368   2368  2368  | 1239  1389 5    |
| 125 3  26 | 4      2568  9     | 7     18   12   |
+-----------+--------------------+-----------------+
| 128 7  3  | 2589   2489  2458  | 1259  19   6    |
| 9   5  26 | 236    7     1     | 8     4    23   |
| 128 16 4  | 235689 23689 23568 | 12359 7    1239 |
+-----------+--------------------+-----------------+

Play this puzzle online at the Daily Sudoku site


As far as I know xyzs are fine for solving VHs. Good spot over the
more obvious(?) xy.

Hugh (another lazy morning in the Western Hemisphere...)
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RobertRattley



Joined: 24 Jun 2007
Posts: 57
Location: Australia

PostPosted: Fri Apr 12, 2013 7:01 pm    Post subject: Reply with quote

Thanks, Hugh, for posting the grid.

Those were my basics too. And my xy-wing was a 126 with fulcrum box 4 cell 9, pinching box 4 cell 7 on 1. (See! I use a different notation! How perverse of me.)

Good spot, kuskey. I didn't see that xyz wing. And, assuredly, xyz wings do "count" equally. Virtually by definition, a "very hard" puzzle on this site is one that needs, and can be solved by, one or more x-wings, xy-wings or xyz-wings. Not to imply that it's "wrong" to use some other technique - whatever solves the puzzle.
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viiiknow



Joined: 13 Apr 2013
Posts: 1

PostPosted: Sat Apr 13, 2013 6:51 am    Post subject: Reply with quote

Thank you all. This is one deviously delicious puzzle.
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