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Jun 26 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 664
Location: Dar es Salaam Tanzania

PostPosted: Sun Jun 26, 2011 12:35 am    Post subject: Jun 26 VH Reply with quote

A long process for me:-
1) A kite originating from BOX 7 sets r1c6<>9 opens an
2) XYZ-Wing 14 147 47 with apex in r1c6 sets r1c5<>4
3) UR in 34 removes 4 in r46c2 which opens another kite in 4 originating from BOX 7 setting r1c6<>4 this leads to
4) W-Wing 48 with strong link 4 in row 1 setting r7c1<>8 which finally solves it.
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Marty R.



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

PostPosted: Sun Jun 26, 2011 12:58 am    Post subject: Reply with quote

Like Clement, I didn't have an easy time. This is my post-basics grid:

Code:

+--------------+---------------+------------+
| 149 14   8   | 5   4679 1479 | 3   2  67  |
| 2   5    6   | 47  3    8    | 147 9  17  |
| 3   7    149 | 2   469  149  | 48  5  68  |
+--------------+---------------+------------+
| 6   1348 2   | 478 5    47   | 9   34 178 |
| 48  9    5   | 1   478  3    | 78  6  2   |
| 148 1348 7   | 9   2    6    | 18  34 5   |
+--------------+---------------+------------+
| 189 6    19  | 3   89   5    | 2   7  4   |
| 7   2    49  | 6   1    49   | 5   8  3   |
| 5   48   3   | 478 478  2    | 6   1  9   |
+--------------+---------------+------------+

Play this puzzle online at the Daily Sudoku site

I couldn't find any of the VH moves other than an apparently useless 148 XYZ-Wing. I used overlapping ERs on 49 to remove those two numbers from r1c6, setting up an XY-Wing (174) which removed 4 from r1c5 and from r3c3 after a pincer transport. The 34 UR, originally a Type 4, is now a Type 2 and finishes it off.
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keith



Joined: 19 Sep 2005
Posts: 3165
Location: near Detroit, Michigan, USA

PostPosted: Sun Jun 26, 2011 1:51 am    Post subject: Reply with quote

Quote:
Why is the XYZ-wing useless? It eliminates 8 in R6C2. It sets up an X-wing that solves the puzzle.

Keith
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keith



Joined: 19 Sep 2005
Posts: 3165
Location: near Detroit, Michigan, USA

PostPosted: Sun Jun 26, 2011 2:21 am    Post subject: Reply with quote

Overkill of course, but ...

An M-wing nails it. After basics:
Code:
+----------------+----------------+----------------+
| 149  14a  8    | 5   -4679 1-479| 3    2    67   |
| 2    5    6    | 47e  3    8    | 147d 9    17   |
| 3    7    149  | 2    469  149  | 48   5    68   |
+----------------+----------------+----------------+
| 6    1348 2    | 478  5    47   | 9    34   178c |
| 48   9    5    | 1    478  3    | 78   6    2    |
| 148b 1348 7    | 9    2    6    | 18   34   5    |
+----------------+----------------+----------------+
| 189  6    19   | 3    89   5    | 2    7    4    |
| 7    2    49   | 6    1    49   | 5    8    3    |
| 5    48   3    | 478  478  2    | 6    1    9    |
+----------------+----------------+----------------+
1 in a forces 1 in b, c, d. Not 1 in d forces 4 in e, making the eliminations shown.

Keith
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Marty R.



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

PostPosted: Sun Jun 26, 2011 3:41 am    Post subject: Reply with quote

keith wrote:
Quote:
Why is the XYZ-wing useless? It eliminates 8 in R6C2. It sets up an X-wing that solves the puzzle.

Keith

It obviously isn't useless, but my analysis was. I just eyeballed it for apparent help and didn't carry it as far as an X-Wing search.
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prakash



Joined: 02 Jan 2008
Posts: 67
Location: New Jersey, USA

PostPosted: Sun Jun 26, 2011 3:55 pm    Post subject: Reply with quote

Like Clement I used the kite and the XYZ wing, but, the third step for me was a finned X wing in 4. This solved th puzzle.
- PJ
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George Woods



Joined: 28 Mar 2006
Posts: 232
Location: Dorset UK

PostPosted: Sun Jun 26, 2011 4:18 pm    Post subject: don't know whether it waS an M wing but Reply with quote

I used the 14 in r1c2 (first doublet in the grid) If 1 then r4c9 is 1 directly and if not 1 than the 8s in boxes 7,8 and 5 fall out immediately and lead to r4c9 <>8 hence r3c9=8 AND A SOLUTION . I thought this was an act of desperation but if I can call it an M wing then great!
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cgordon



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

PostPosted: Mon Jun 27, 2011 5:20 pm    Post subject: Reply with quote

I used ERs to remove the 4 and 9 from R1C6 then an xy wing on 147.
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