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Sep 2 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 676
Location: Dar es Salaam Tanzania

PostPosted: Thu Sep 01, 2011 11:20 pm    Post subject: Sep 2 VH Reply with quote

Type 4 UR 78 setting r13c2<>8 reveals an
XYZ-Wing 248 with apex in r1c3; r1c2<>4 solves it.
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Marty R.



Joined: 12 Feb 2006
Posts: 5160
Location: Rochester, NY, USA

PostPosted: Fri Sep 02, 2011 3:51 am    Post subject: Reply with quote

I also didn't find a solution using just the standard VH moves. I played an XYZ wing (478), X-Wing (7), followed by a Type 1 UR on 78.
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roaa



Joined: 18 Apr 2009
Posts: 72
Location: Sweden

PostPosted: Fri Sep 02, 2011 1:16 pm    Post subject: Reply with quote

The xyz-wing 478 was all I needed.
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Marty R.



Joined: 12 Feb 2006
Posts: 5160
Location: Rochester, NY, USA

PostPosted: Fri Sep 02, 2011 3:37 pm    Post subject: Reply with quote

roaa wrote:
The xyz-wing 478 was all I needed.

I'm jealous!! I noticed the Wing but didn't carry it through. Embarassed
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Clement



Joined: 24 Apr 2006
Posts: 676
Location: Dar es Salaam Tanzania

PostPosted: Fri Sep 02, 2011 4:32 pm    Post subject: Sep 2 VH Reply with quote

roaa,Marty,
I am still at a loss. The xyz-wing 478 with apex in r1c2 (if it is the one you are refering to) sets r1c3<>8 leading to the Type 1 UR 78. I do not see how other eliminations ca be made wihout using it. Can you show the Grid after the basic moves so that I can easily follow?
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Marty R.



Joined: 12 Feb 2006
Posts: 5160
Location: Rochester, NY, USA

PostPosted: Fri Sep 02, 2011 4:49 pm    Post subject: Reply with quote

Clement, this is my post-basics grid. I first played with pencil and paper, but I successfully completed the puzzle online just with the XYZ-Wing.

Code:

+--------------+----------------+---------+
| 9   478 248  | 6    247  3    | 78 1 5  |
| 6   1   48   | 4578 457  458  | 9  2 3  |
| 357 578 238  | 9    1    28   | 78 6 4  |
+--------------+----------------+---------+
| 47  3   6    | 1    457  45   | 2  9 8  |
| 1   9   5    | 2    8    6    | 3  4 7  |
| 8   2   47   | 47   3    9    | 16 5 16 |
+--------------+----------------+---------+
| 2   458 1489 | 458  4569 7    | 45 3 16 |
| 345 458 1348 | 458  2456 2458 | 16 7 9  |
| 457 6   479  | 3    459  1    | 45 8 2  |
+--------------+----------------+---------+

Play this puzzle online at the Daily Sudoku site
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Stanley P



Joined: 27 Feb 2008
Posts: 16
Location: Tennessee, USA

PostPosted: Fri Sep 02, 2011 7:36 pm    Post subject: sep 2 VH Reply with quote

I'm getting to this a little late today, and used 2 x-wings, the last eliminating the 7 at R1C5, which set up the 248 xyz.
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keith



Joined: 19 Sep 2005
Posts: 3173
Location: near Detroit, Michigan, USA

PostPosted: Fri Sep 02, 2011 9:29 pm    Post subject: Reply with quote

After basics:
Code:
+----------------+----------------+----------------+
| 9    478  248  | 6    24   3    | 78   1    5    |
| 6    1    48   | 4578 457  458  | 9    2    3    |
| 35   578  238  | 9    1    28   | 78   6    4    |
+----------------+----------------+----------------+
| 47   3    6    | 1    457  45   | 2    9    8    |
| 1    9    5    | 2    8    6    | 3    4    7    |
| 8    2    47   | 47   3    9    | 16   5    16   |
+----------------+----------------+----------------+
| 2    458  1489 | 458  4569 7    | 1456 3    16   |
| 345  458  1348 | 458  2456 2458 | 1456 7    9    |
| 457  6    479  | 3    459  1    | 45   8    2    |
+----------------+----------------+----------------+
There are two XYZ-wings in R1B1: 47-8 and 2-48.

They do essentially the same thing. Each is a one-stepper.

Keith
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