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Nov 27 VH

 
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hughwill



Joined: 05 Apr 2010
Posts: 414
Location: Birmingham UK

PostPosted: Thu Nov 27, 2014 10:59 am    Post subject: Nov 27 VH Reply with quote

After (very sparse) basics:
Code:

+----------------+----------------+--------------------+
| 3     8   6    | 9     2   1    | 4      7     5     |
| 9     47  147  | 58    34  58   | 2      6     13    |
| 24    5   124  | 7     34  6    | 138    138   9     |
+----------------+----------------+--------------------+
| 567   37  57   | 15    8   4    | 9      2     136   |
| 24568 234 245  | 125   157 9    | 135678 13458 13468 |
| 2458  1   9    | 3     6   257  | 578    458   48    |
+----------------+----------------+--------------------+
| 1     247 2457 | 2568  57  3    | 568    9     2468  |
| 2457  9   3    | 12568 157 2578 | 568    458   2468  |
| 25    6   8    | 4     9   25   | 13     13    7     |
+----------------+----------------+--------------------+

Play this puzzle online at the Daily Sudoku site

This one was a real cracker- very few basics and hard for me to see all the
way through (though I expect Dan or George will come up with a one-stepper).
(As always, 'select' in the white spaces to see solution).

First it needed a
Quote:
X wing on 2 (r69) setting r3c1 to 4

Then after more basics:
Code:

+------------+---------------+----------------+
| 3   8  6   | 9     2   1   | 4     7   5    |
| 9   7  1   | 58    4   58  | 2     6   3    |
| 4   5  2   | 7     3   6   | 18    18  9    |
+------------+---------------+----------------+
| 567 3  57  | 15    8   4   | 9     2   16   |
| 568 24 45  | 125   157 9   | 35678 358 168  |
| 258 1  9   | 3     6   257 | 578   458 48   |
+------------+---------------+----------------+
| 1   24 457 | 2568  57  3   | 568   9   268  |
| 57  9  3   | 12568 157 578 | 568   458 2468 |
| 25  6  8   | 4     9   25  | 13    13  7    |
+------------+---------------+----------------+

Play this puzzle online at the Daily Sudoku site
Quote:
A 578 XYZ-Wing pivot r8c6

leaving basics only.

Took me ages- loved it!

Hugh
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA

PostPosted: Thu Nov 27, 2014 11:28 am    Post subject: Reply with quote

Code:
 *-----------------------------------------------------------------------------*
 | 3       8       6       | 9       2       1       | 4       7       5       |
 | 9       47      147     | 58      34      58      | 2       6       13      |
 | 24      5       124     | 7       34      6       | 138     138     9       |
 |-------------------------+-------------------------+-------------------------|
 | 567     37      57      | 15      8       4       | 9       2       136     |
 | 24568   234     245     | 125     157     9       | 135678  13458   13468   |
 | 2458    1       9       | 3       6      d57-2    | 578     458     48      |
 |-------------------------+-------------------------+-------------------------|
 | 1       247     2457    | 2568   b57      3       | 568     9       2468    |
 | 2457    9       3       | 12568   157    c2578    | 568     458     2468    |
 | 25      6       8       | 4       9      a25      | 13      13      7       |
 *-----------------------------------------------------------------------------*
(2=5)r9c6-(5=7)r7c5-r8c6=7r6c6 => -2r6c6; ste


This is called a Hybrid Wing (H-wing) 2/3rds xy-wing (ab) 1/3 extension (cd)
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George Woods



Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK

PostPosted: Thu Nov 27, 2014 6:31 pm    Post subject: almost an xy wing and a hybrid Reply with quote

I solved it by what I call almost an xy wing- to wit if r6c6 is not 5 the an xy wing 257 pivoted at r9c6 leads to the aforesaid r6c6 becoming 7 so r6c6 is either 5 or 7 and not 2.

This gives the same result as the "hybrid xy wing" though it uses slightly different elements and in particular not r8c6 yet the two logics lead to the same conclusion!
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Thu Nov 27, 2014 8:53 pm    Post subject: Re: Nov 27 VH Reply with quote

hughwill wrote:
After (very sparse) basics:
Code:

+----------------+----------------+--------------------+
| 3     8   6    | 9     2   1    | 4      7     5     |
| 9     47  147  | 58    34  58   | 2      6     13    |
| 24    5   124  | 7     34  6    | 138    138   9     |
+----------------+----------------+--------------------+
| 567   37  57   | 15    8   4    | 9      2     136   |
| 24568 234 245  | 125   157 9    | 135678 13458 13468 |
| 2458  1   9    | 3     6   257  | 578    458   48    |
+----------------+----------------+--------------------+
| 1     247 2457 | 2568  57  3    | 568    9     2468  |
| 2457  9   3    | 12568 157 2578 | 568    458   2468  |
| 25    6   8    | 4     9   25   | 13     13    7     |
+----------------+----------------+--------------------+

Play this puzzle online at the Daily Sudoku site

This one was a real cracker- very few basics and hard for me to see all the
way through (though I expect Dan or George will come up with a one-stepper).
(As always, 'select' in the white spaces to see solution).

First it needed a
Quote:
X wing on 2 (r69) setting r3c1 to 4

Then after more basics:
Code:

+------------+---------------+----------------+
| 3   8  6   | 9     2   1   | 4     7   5    |
| 9   7  1   | 58    4   58  | 2     6   3    |
| 4   5  2   | 7     3   6   | 18    18  9    |
+------------+---------------+----------------+
| 567 3  57  | 15    8   4   | 9     2   16   |
| 568 24 45  | 125   157 9   | 35678 358 168  |
| 258 1  9   | 3     6   257 | 578   458 48   |
+------------+---------------+----------------+
| 1   24 457 | 2568  57  3   | 568   9   268  |
| 57  9  3   | 12568 157 578 | 568   458 2468 |
| 25  6  8   | 4     9   25  | 13    13  7    |
+------------+---------------+----------------+

Play this puzzle online at the Daily Sudoku site
Quote:
A 578 XYZ-Wing pivot r8c6

leaving basics only.

Took me ages- loved it!

Hugh


I'm not 100% sure, but I think the W-WING ON 57 does IT, although I haven't tested thoroughly.
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George Woods



Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK

PostPosted: Sat Nov 29, 2014 6:26 pm    Post subject: Reply with quote

Marty wrote
Don;t know for sure.....

now that draw play is working again - the result of the W wing leads to a 7 in r7c5 and petting in that 7 and pressing "grade" gives the retult "easy" and that show s that the task is complete!!
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RobertRattley



Joined: 24 Jun 2007
Posts: 117
Location: Australia

PostPosted: Sun Dec 07, 2014 7:56 pm    Post subject: Reply with quote

I agree with hughwill's 2 stepper. It also took me a long time to solve this puzzle.

The x-wing makes the xyz wing available straight away before going ahead with a second round of basics.
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lucygp



Joined: 29 Dec 2014
Posts: 3

PostPosted: Mon Dec 29, 2014 8:01 am    Post subject: Reply with quote

pressing "grade" gives the retult "easy" and that show s












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