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Jan 13 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 639
Location: Dar es Salaam Tanzania

PostPosted: Sat Jan 12, 2013 11:22 pm    Post subject: Jan 13 VH Reply with quote

Basics Only.
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kuskey



Joined: 10 Dec 2008
Posts: 119
Location: Pembroke, NH

PostPosted: Sun Jan 13, 2013 7:16 am    Post subject: Jan 13 VH Reply with quote

Yup-worked twice for me too.
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Pat



Joined: 23 Feb 2010
Posts: 162

PostPosted: Sun Jan 13, 2013 10:13 am    Post subject: Reply with quote


    just one move,
    a "naked" duo
the only slightly-interesting thing here
is the red herrings
the puzzle has 3 duos
most of which are useless
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hughwill



Joined: 05 Apr 2010
Posts: 142
Location: Birmingham UK

PostPosted: Sun Jan 13, 2013 11:00 am    Post subject: Jan 13 VH Reply with quote

After most basics:
Code:

+----------------+------------+-------------+
| 123  9    8    | 127  5 237 | 127 6    4  |
| 1234 3456 1256 | 1267 8 237 | 127 1237 9  |
| 7    346  126  | 126  4 9   | 5   123  8  |
+----------------+------------+-------------+
| 28   1    7    | 4    9 28  | 3   5    6  |
| 49   46   69   | 3    7 5   | 8   12   12 |
| 5    28   3    | 28   1 6   | 9   4    7  |
+----------------+------------+-------------+
| 128  28   4    | 9    3 78  | 6   127  5  |
| 6    35   15   | 78   2 4   | 17  9    13 |
| 239  7    29   | 5    6 1   | 4   8    23 |
+----------------+------------+-------------+

Play this puzzle online at the Daily Sudoku site

This still grades as VH at this point but when the sole candidate 8 on
r8 is put in grading changes to easy. A quirk of the (Samgj's?) original
algorithm no doubt- but can anyone work out why?
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blindleader



Joined: 11 Jan 2013
Posts: 2

PostPosted: Mon Jan 14, 2013 8:21 pm    Post subject: Re: Jan 13 VH Reply with quote

hughwill wrote:
A quirk of the (Samgj's?) original
algorithm no doubt- but can anyone work out why?
I'm new to this site. I find this scenario (hidden single in a grid with a many candidates) very hard unless I slow down and work very methodically. This one stymied me several times yesterday, but today it took about as long as a medium takes. The same thing happens occasionally on sudoko dot org dot uk on puzzles rated below the most difficult and it always gives me fits there, too.

Maybe the original programmers were in the same boat?
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blindleader



Joined: 11 Jan 2013
Posts: 2

PostPosted: Mon Jan 14, 2013 8:29 pm    Post subject: Re: Jan 13 VH Reply with quote

Quote:
hidden single
I guess in the local dialect, that means locked candidate. Question
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Marty R.



Joined: 12 Feb 2006
Posts: 5063
Location: Rochester, NY, USA

PostPosted: Mon Jan 14, 2013 9:16 pm    Post subject: Re: Jan 13 VH Reply with quote

blindleader wrote:
Quote:
hidden single
I guess in the local dialect, that means locked candidate. Question


No, not quite. A hidden single is when there is just one occurrence of a number in a row, column or box. It's considered "hidden" because there's at least one other number in the cell. An example is in the grid above in which an 8 is a hidden single in row 8.

Personally, I don't ever see the hidden singles, rather I see the complementary subsets. In that row is a triple 135 which will get to the single after the eliminations.
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RobertRattley



Joined: 24 Jun 2007
Posts: 53
Location: Australia

PostPosted: Tue Jan 15, 2013 3:15 pm    Post subject: Reply with quote

I missed all the above. Sigh.

What I found after hughwill's "most basics", before finishing all the pencil marks, was an x-wing on 8. So I was quite contented to solve it as a "very hard"! If it had been published as a hard, I'm confident I'd have finished the pencil marking and found the not-very-hard solution.
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