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July 31st VH

 
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hughwill



Joined: 05 Apr 2010
Posts: 198
Location: Birmingham UK

PostPosted: Wed Jul 31, 2013 9:51 am    Post subject: July 31st VH Reply with quote

Code:

+---------+-----------+------------+
| 9  8 13 | 4  5  6   | 17  137 2  |
| 6  4 13 | 7  8  2   | 9   13  5  |
| 5  7 2  | 3  1  9   | 4   8   6  |
+---------+-----------+------------+
| 14 2 8  | 5  79 3   | 6   49  17 |
| 3  5 79 | 1  6  47  | 2   49  8  |
| 14 6 79 | 89 2  478 | 3   5   17 |
+---------+-----------+------------+
| 78 1 4  | 6  3  78  | 5   2   9  |
| 78 9 5  | 2  4  1   | 78  6   3  |
| 2  3 6  | 89 79 5   | 178 17  4  |
+---------+-----------+------------+

Play this puzzle online at the Daily Sudoku site

A touch of the usual:
Quote:
Either of the 'double' 479 XY wings in boxes 5 and 6

The obvious Type 1 UR on 13 doesn't quite do it, I think....
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roaa



Joined: 18 Apr 2009
Posts: 72
Location: Sweden

PostPosted: Thu Aug 01, 2013 4:01 pm    Post subject: Reply with quote

The xy-wing 479 pivoted in r5c6 makes it in one step.
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hughwill



Joined: 05 Apr 2010
Posts: 198
Location: Birmingham UK

PostPosted: Thu Aug 01, 2013 4:52 pm    Post subject: Reply with quote

roaa said:
Quote:
The xy-wing 479 pivoted in r5c6 makes it in one step.


In my first post I used the approach used in some of the older posts
to this forum to hide the same solution. I guess it was done so that if
stuck you could get a clue without the full solution. If you 'drag to select'
in the white area of the quote the solution appears. It's done by changing
the font colour to white of course.......

And I learnt the trick from Marty R so it must be good! Very Happy
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RobertRattley



Joined: 24 Jun 2007
Posts: 57
Location: Australia

PostPosted: Sat Aug 03, 2013 4:31 pm    Post subject: Reply with quote

I enjoy each daily puzzle on this site. The "hard" ones I sometimes find more time consuming than the "very hard", usually because by the time I get to the pencil-mark stage there's already something I've missed.

What I liked about this particular puzzle was the 2 "hard" steps before the pencil marks revealed the XY wing(s), namely, the early pair 14 in box 4 and the much later pair 49 in box 6. So for me this puzzle was richer than a "touch of the usual".
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