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Jan 14 VH

 
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RobertRattley



Joined: 24 Jun 2007
Posts: 57
Location: Australia

PostPosted: Tue Jan 14, 2014 3:01 am    Post subject: Jan 14 VH Reply with quote

x wing 7
xy wing 159

If I post too early it might look as if I've cheated the computer's midnight. But I'm near the early edge of the International Date Line and all I have to do is solve a puzzle in the wee hours.
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Marty R.



Joined: 12 Feb 2006
Posts: 5162
Location: Rochester, NY, USA

PostPosted: Tue Jan 14, 2014 6:01 am    Post subject: Reply with quote

My X-Wing was on 9 in c58 followed by the same XY-Wing.
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hughwill



Joined: 05 Apr 2010
Posts: 207
Location: Birmingham UK

PostPosted: Tue Jan 14, 2014 9:34 am    Post subject: Jan 14VH Reply with quote

After basics:
Code:

+---------------+--------------+-------------+
| 4579 59  4579 | 2    6  49   | 1    3  8   |
| 149  19  3    | 49   8  5    | 6    2  7   |
| 8    2   6    | 7    1  3    | 59   4  59  |
+---------------+--------------+-------------+
| 459  8   459  | 59   3  6    | 7    1  2   |
| 1579 6   1579 | 8    79 2    | 34   59 34  |
| 579  3   2    | 159  4  179  | 8    6  59  |
+---------------+--------------+-------------+
| 2    4   19   | 139  5  8    | 39   7  6   |
| 3    159 8    | 6    79 1479 | 2    59 14  |
| 6    7   159  | 1349 2  149  | 3459 8  134 |
+---------------+--------------+-------------+

Play this puzzle online at the Daily Sudoku site

Same solution- very satisfying today!
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RobertRattley



Joined: 24 Jun 2007
Posts: 57
Location: Australia

PostPosted: Tue Jan 14, 2014 3:07 pm    Post subject: Re: Jan 14 VH Reply with quote

RobertRattley wrote:
x wing 7
xy wing 159...


Oops! Typo. I meant x wing 9.
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George Woods



Joined: 28 Mar 2006
Posts: 233
Location: Dorset UK

PostPosted: Tue Jan 14, 2014 4:04 pm    Post subject: Can't find the 159 wing Reply with quote

Forgive me- I get the same result and the x wing on 9 as quoted but can't find the 15 to make up a 159 xy wing. There is a kind of x wing 579 with pivot at r5c5 that leads to a 5 at r4c4 but for me no obvious continuation
HELP
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Marty R.



Joined: 12 Feb 2006
Posts: 5162
Location: Rochester, NY, USA

PostPosted: Tue Jan 14, 2014 6:12 pm    Post subject: Re: Can't find the 159 wing Reply with quote

George Woods wrote:
Forgive me- I get the same result and the x wing on 9 as quoted but can't find the 15 to make up a 159 xy wing. There is a kind of x wing 579 with pivot at r5c5 that leads to a 5 at r4c4 but for me no obvious continuation
HELP


The X-Wing takes out a 9 from r8c2, which then becomes the XY-Wing pivot.
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George Woods



Joined: 28 Mar 2006
Posts: 233
Location: Dorset UK

PostPosted: Wed Jan 15, 2014 1:05 pm    Post subject: a kind of XY wing Reply with quote

Thanks Marty -Just after posting my problem I realised I had serviced only half of the X wing. and of course correcting that gives a direct solution.

BUT is the kind of XY that Idescribed andlead to the 5 at r4c4 classified as an XY wing and if not how is it described?
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Marty R.



Joined: 12 Feb 2006
Posts: 5162
Location: Rochester, NY, USA

PostPosted: Wed Jan 15, 2014 4:15 pm    Post subject: Reply with quote

George,

I'm sorry, but I just don't know what combination of cells constitute what you're asking about. This is the grid after the X-Wing is executed.

Code:

+--------------+-------------+-------------+
| 4579 59 4579 | 2    6  49  | 1    3  8   |
| 149  19 3    | 49   8  5   | 6    2  7   |
| 8    2  6    | 7    1  3   | 59   4  59  |
+--------------+-------------+-------------+
| 459  8  459  | 59   3  6   | 7    1  2   |
| 157  6  157  | 8    79 2   | 34   59 34  |
| 579  3  2    | 159  4  179 | 8    6  59  |
+--------------+-------------+-------------+
| 2    4  19   | 139  5  8   | 39   7  6   |
| 3    15 8    | 6    79 147 | 2    59 14  |
| 6    7  159  | 1349 2  149 | 3459 8  134 |
+--------------+-------------+-------------+

Play this puzzle online at the Daily Sudoku site
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George Woods



Joined: 28 Mar 2006
Posts: 233
Location: Dorset UK

PostPosted: Wed Jan 15, 2014 7:23 pm    Post subject: almost an XY Reply with quote

XY (nearly 597)

Take the pivot at r5c5 If 7 the pair of 15s in Block 4 denaies 5s to top row in that block OR if 9 then same row of block 4 is denied 5 ergo r4c4 is 5
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Marty R.



Joined: 12 Feb 2006
Posts: 5162
Location: Rochester, NY, USA

PostPosted: Wed Jan 15, 2014 8:14 pm    Post subject: Re: almost an XY Reply with quote

George Woods wrote:
XY (nearly 597)

Take the pivot at r5c5 If 7 the pair of 15s in Block 4 denaies 5s to top row in that block OR if 9 then same row of block 4 is denied 5 ergo r4c4 is 5


Code:
+--------------+-------------+-------------+
| 4579 59 4579 | 2    6  49  | 1    3  8   |
| 149  19 3    | 49   8  5   | 6    2  7   |
| 8    2  6    | 7    1  3   | 59   4  59  |
+--------------+-------------+-------------+
| 459  8  459  | 59   3  6   | 7    1  2   |
| 157  6  157  | 8    79 2   | 34   59 34  |
| 579  3  2    | 159  4  179 | 8    6  59  |
+--------------+-------------+-------------+
| 2    4  19   | 139  5  8   | 39   7  6   |
| 3    15 8    | 6    79 147 | 2    59 14  |
| 6    7  159  | 1349 2  149 | 3459 8  134 |
+--------------+-------------+-------------+


George,

I am hardly an expert on such things, but that might be an XY-Wing with r5c13 being a pseudo cell, i.e., the two cells act as one 57 pincer. Then you would treat it as an XY-Wing=>r4c13<>5 rather than having to look at each value of r5c5.

If by any chance Keith sees this, he'll be able to give the final word.
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