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Nov 26 VH

 
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Earl



Joined: 30 May 2007
Posts: 677
Location: Victoria, KS

PostPosted: Wed Nov 26, 2008 3:05 am    Post subject: Nov 26 VH Reply with quote

I needed two xy-wings. Anyone find a single-step solution?

Earl
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arkietech



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

PostPosted: Wed Nov 26, 2008 7:32 am    Post subject: Reply with quote

I found an xyz-wing that cracked it
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nataraj



Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria

PostPosted: Wed Nov 26, 2008 7:32 am    Post subject: Reply with quote

After basics, coloring didn't turn up anything really useful (one measly r5c6<>7), but then I found an xyz-wing (67-678-78 col 9, box 6; r6c9<>7) that solved the puzzle.
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crunched



Joined: 05 Feb 2008
Posts: 168

PostPosted: Wed Nov 26, 2008 7:48 am    Post subject: Re: Nov 26 VH Reply with quote

Earl wrote:
I needed two xy-wings. Anyone find a single-step solution?

Earl


Here is the grid after basics.
6-7-9 is the 1st xy-wing. It removes all the 7s in c6 in box 5
4-6-7 is the other xy-wing opened up from the first xy-wing.
Where is the x-y-z wing in box 6?

Code:

+-----------+--------------+----------------+
| 5 4   3   | 2   8   67   | 1   9    67    |
| 2 16  9   | 5   347 1367 | 46  3478 34678 |
| 7 8   16  | 69  34  169  | 2   34   5     |
+-----------+--------------+----------------+
| 3 567 4   | 79  1   5789 | 56  2    678   |
| 1 567 568 | 347 2   3578 | 456 478  9     |
| 9 2   58  | 47  6   578  | 3   1    478   |
+-----------+--------------+----------------+
| 4 9   2   | 367 37  367  | 8   5    1     |
| 6 15  15  | 8   9   2    | 7   34   34    |
| 8 3   7   | 1   5   4    | 9   6    2     |
+-----------+--------------+----------------+

Play this puzzle online at the Daily Sudoku site
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storm_norm



Joined: 18 Oct 2007
Posts: 1741

PostPosted: Wed Nov 26, 2008 8:18 am    Post subject: Reply with quote

xyz in col 8 and 9
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nataraj



Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria

PostPosted: Wed Nov 26, 2008 8:39 am    Post subject: Reply with quote

crunched, you missed a naked pair 34 in col 8
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arkietech



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

PostPosted: Wed Nov 26, 2008 12:00 pm    Post subject: Re: Nov 26 VH Reply with quote

crunched wrote:
Where is the x-y-z wing in box 6?
Here is the xyz I found after basics
Code:
 *--------------------------------------------------------------------*
 | 5      4      3      | 2      8      67     | 1      9     *67     |
 | 2      16     9      | 5      347    1367   | 46     78     34678  |
 | 7      8      16     | 69     34     169    | 2      34     5      |
 |----------------------+----------------------+----------------------|
 | 3      567    4      | 79     1      5789   | 56     2     *678    |
 | 1      567    568    | 347    2      3578   | 456   *78     9      |
 | 9      2      58     | 47     6      578    | 3      1      48-7   |
 |----------------------+----------------------+----------------------|
 | 4      9      2      | 367    37     367    | 8      5      1      |
 | 6      15     15     | 8      9      2      | 7      34     34     |
 | 8      3      7      | 1      5      4      | 9      6      2      |
 *--------------------------------------------------------------------*
xyz-wing(678)
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crunched



Joined: 05 Feb 2008
Posts: 168

PostPosted: Wed Nov 26, 2008 2:23 pm    Post subject: Reply with quote

nataraj wrote:
crunched, you missed a naked pair 34 in col 8


Aha! There it is! Thanks.
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania

PostPosted: Wed Nov 26, 2008 7:43 pm    Post subject: Daily Sudoku: Thu 26-Nov-2008 VH Reply with quote

XY-Wing {679} with pivot{69} in r3c4 eliminating the 7's in BLOCK5c6. To avoid the DP in the resulting UR{5,8} in BLOCK4&5, 6 should be eliminated in r3c3. This solves the puzzle.
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

PostPosted: Wed Nov 26, 2008 11:12 pm    Post subject: Reply with quote

I found a finned x-wing on <7>, but then saw the xyz-wing on <368> and realized it lead to the same deletions as the finned x-wing but also solved the puzzle.

Ted Smile
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cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada

PostPosted: Thu Nov 27, 2008 10:00 pm    Post subject: Reply with quote

Was away for this one - so surprised no one cited the xyz wing on <678> as a one-stepper. The elimination knocks off 2 rows of 7s in Box 5 - then it's curtains.
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