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24th Feb VH

 
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hughwill



Joined: 05 Apr 2010
Posts: 222
Location: Birmingham UK

PostPosted: Sun Feb 24, 2013 10:57 am    Post subject: 24th Feb VH Reply with quote

Tedious basics- sorry if they're not finished:
Code:

+--------------+-------------+-----------------+
| 3   159 47   | 8  2    15  | 4579 567  15679 |
| 24  159 8    | 7  15   6   | 24   3    159   |
| 27  15  6    | 3  4    9   | 257  578  1578  |
+--------------+-------------+-----------------+
| 6   4   359  | 29 579  25  | 8    1    357   |
| 589 2   359  | 6  1579 158 | 57   4    357   |
| 58  7   1    | 4  35   358 | 6    9    2     |
+--------------+-------------+-----------------+
| 459 6   2459 | 1  8    7   | 3    25   59    |
| 79  38  279  | 5  39   4   | 1    2678 6789  |
| 1   38  579  | 29 6    23  | 579  578  4     |
+--------------+-------------+-----------------+

Play this puzzle online at the Daily Sudoku site

One stepper:
Quote:
235 XY pivot r4c6


Have recent VHs been a bit uninteresting, or is it just me?

Hugh
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keith



Joined: 19 Sep 2005
Posts: 3182
Location: near Detroit, Michigan, USA

PostPosted: Mon Feb 25, 2013 1:47 am    Post subject: Reply with quote

Hugh,

I do not believe you have become less interesting, so it must be the puzzles.

Keith Wink
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Marty R.



Joined: 12 Feb 2006
Posts: 5175
Location: Rochester, NY, USA

PostPosted: Mon Feb 25, 2013 2:32 am    Post subject: Reply with quote

Well, Keith's in fine form today. Very Happy

As to the puzzles, I can't compare recent to not so recent, but an XY one-stepper is a commonly seen solution.
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hughwill



Joined: 05 Apr 2010
Posts: 222
Location: Birmingham UK

PostPosted: Mon Feb 25, 2013 10:37 am    Post subject: Reply with quote

keith wrote:
Hugh,

I do not believe you have become less interesting, so it must be the puzzles.

Keith Wink


You're too kind Keith......
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the_lock_man



Joined: 18 Dec 2012
Posts: 10
Location: Portsmarfff, UK

PostPosted: Mon Feb 25, 2013 12:45 pm    Post subject: Re: 24th Feb VH Reply with quote

hughwill wrote:


Have recent VHs been a bit uninteresting, or is it just me?

Hugh


Perhaps you are just becoming better at spotting them?
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jay



Joined: 19 Feb 2013
Posts: 10
Location: Grove, Oklahoma

PostPosted: Mon Feb 25, 2013 6:37 pm    Post subject: 2-24-13 Reply with quote

Code:

+---------------+---------------+-----------------+
| 3    159 47   | 8  2     15   | 4579 567  15679 |
| 24   159 8    | 7  15    6    | 24   3    159   |
| 27   15  6    | 3  4     9    | 257  2578 1578  |
+---------------+---------------+-----------------+
| 6    4   359  | 29 3579  235  | 8    1    357   |
| 589  2   359  | 6  13579 1358 | 57   4    357   |
| 58   7   1    | 4  35    358  | 6    9    2     |
+---------------+---------------+-----------------+
| 2459 6   2459 | 1  8     7    | 3    25   59    |
| 279  38  279  | 5  39    4    | 1    2678 6789  |
| 1    38  2579 | 29 6     23   | 2579 2578 4     |
+---------------+---------------+-----------------+

Play this puzzle online at the Daily Sudoku site

I found this one hard to do. An xyz (235) wing helped, but then I had to find and use another wing to finish.
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Marty R.



Joined: 12 Feb 2006
Posts: 5175
Location: Rochester, NY, USA

PostPosted: Mon Feb 25, 2013 10:31 pm    Post subject: Re: 2-24-13 Reply with quote

jay wrote:
Code:

+---------------+---------------+-----------------+
| 3    159 47   | 8  2     15   | 4579 567  15679 |
| 24   159 8    | 7  15    6    | 24   3    159   |
| 27   15  6    | 3  4     9    | 257  2578 1578  |
+---------------+---------------+-----------------+
| 6    4   359  | 29 3579  235  | 8    1    357   |
| 589  2   359  | 6  13579 1358 | 57   4    357   |
| 58   7   1    | 4  35    358  | 6    9    2     |
+---------------+---------------+-----------------+
| 2459 6   2459 | 1  8     7    | 3    25   59    |
| 279  38  279  | 5  39    4    | 1    2678 6789  |
| 1    38  2579 | 29 6     23   | 2579 2578 4     |
+---------------+---------------+-----------------+

Play this puzzle online at the Daily Sudoku site

I found this one hard to do. An xyz (235) wing helped, but then I had to find and use another wing to finish.


Jay,

I didn't look carefully at the entire grid, but take a very close look at row 6.
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jay



Joined: 19 Feb 2013
Posts: 10
Location: Grove, Oklahoma

PostPosted: Tue Feb 26, 2013 2:23 am    Post subject: Re: 2-24-13 Reply with quote

Marty R. wrote:
jay wrote:
Code:

+---------------+---------------+-----------------+
| 3    159 47   | 8  2     15   | 4579 567  15679 |
| 24   159 8    | 7  15    6    | 24   3    159   |
| 27   15  6    | 3  4     9    | 257  2578 1578  |
+---------------+---------------+-----------------+
| 6    4   359  | 29 3579  235  | 8    1    357   |
| 589  2   359  | 6  13579 1358 | 57   4    357   |
| 58   7   1    | 4  35    358  | 6    9    2     |
+---------------+---------------+-----------------+
| 2459 6   2459 | 1  8     7    | 3    25   59    |
| 279  38  279  | 5  39*    4    | 1    2678 6789  |
| 1    38  2579 | 29 6     23   | 2579 2578 4     |
+---------------+---------------+-----------------+

Play this puzzle online at the Daily Sudoku site

I found this one hard to do. An xyz (235) wing helped, but then I had to find and use another wing to finish.


Jay,

I didn't look carefully at the entire grid, but take a very close look at row 6.

____________________________________________
Marty, I am not exactly sure what you see in row 6. However, it does contain 35 which is part of the 23-235-35 xyz wing that I found, pinching off the 3 from *39 in box 8. This allowed me to pare it down to the grid below. There I found another xyz wing in 35-357-57, pinching off the 5s (from *589 & *359) in row 5, box 4.


Code:

+---------------+-----------+-----------------+
| 3    159 4579 | 8 2   15  | 4579 567  15679 |
| 2459 159 8    | 7 15  6   | 2459 3    159   |
| 257  15  6    | 3 4   9   | 257  2578 1578  |
+---------------+-----------+-----------------+
| 6    4   35   | 9 57  2   | 8    1    357   |
| 589* 2  359*  | 6 157 158 | 57   4    357   |
| 58   7   1    | 4 3   58  | 6    9    2     |
+---------------+-----------+-----------------+
| 2459 6   2459 | 1 8   7   | 3    25   59    |
| 27   3   27   | 5 9   4   | 1    68   68    |
| 1    8   579  | 2 6   3   | 579  57   4     |
+---------------+-----------+-----------------+

Play this puzzle online at the Daily Sudoku site
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keith



Joined: 19 Sep 2005
Posts: 3182
Location: near Detroit, Michigan, USA

PostPosted: Tue Feb 26, 2013 2:47 am    Post subject: Reply with quote

Jay,

After basics (from your grid)
Code:
+-------------------+-------------------+-------------------+
| 3     159   47    | 8     2     15    | 4579  567   15679 |
| 24    159   8     | 7     15    6     | 24    3     159   |
| 27    15    6     | 3     4     9     | 257   578   1578  |
+-------------------+-------------------+-------------------+
| 6     4     359   | 29    579   25    | 8     1     357   |
| 589   2     359   | 6     1579  158   | 57    4     357   |
| 58    7     1     | 4     35    358   | 6     9     2     |
+-------------------+-------------------+-------------------+
| 459   6     2459  | 1     8     7     | 3     25    59    |
| 79    38    279   | 5     39    4     | 1     2678  6789  |
| 1     38    579   | 29    6     23    | 579   578   4     |
+-------------------+-------------------+-------------------+

An XY-wing solves it.

Keith
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Marty R.



Joined: 12 Feb 2006
Posts: 5175
Location: Rochester, NY, USA

PostPosted: Tue Feb 26, 2013 4:54 am    Post subject: Reply with quote

Quote:
Marty, I am not exactly sure what you see in row 6.


Jay,

In that original grid the only place for a 3 in row 6 is in box 5. Therefore, no other rows in that box could contain a 3. I'm not sure if you're familiar with the terminology, but that's known as "Locked Candidates", as in the 3s in row 6 are locked in box 5. Some folks also call that Box-Line Interaction.
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jay



Joined: 19 Feb 2013
Posts: 10
Location: Grove, Oklahoma

PostPosted: Thu Feb 28, 2013 3:00 am    Post subject: Reply with quote

Marty R. wrote:
Quote:
Marty, I am not exactly sure what you see in row 6.


Jay,

In that original grid the only place for a 3 in row 6 is in box 5. Therefore, no other rows in that box could contain a 3. I'm not sure if you're familiar with the terminology, but that's known as "Locked Candidates", as in the 3s in row 6 are locked in box 5. Some folks also call that Box-Line Interaction.


Aha! Yes, I am familiar with the technique---though not the terminology. I should have seen it (especially after you gave a big clue), but I obviously had my blinders on. Thanks
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RobertRattley



Joined: 24 Jun 2007
Posts: 57
Location: Australia

PostPosted: Sat Mar 02, 2013 7:25 am    Post subject: Reply with quote

Well, dear friends, I find every puzzle interesting, even the medium and easy ones. But I'm strange.

One thing I liked about this puzzle was that "basics" for me needed a "hard" step. Not very hard, perhaps, but "hard". The pair 38 in column 2.

Even so, with the same basics as spotted in the above postings, it took me an inexplicably long time to spot the 235 xy wing. Hmm. Maybe it is I, with my fluctuating acuity, that am interesting, not the puzzles.
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