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Feb 27 VH

 
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Clement



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

PostPosted: Sun Feb 26, 2012 10:38 pm    Post subject: Feb 27 VH Reply with quote

XYZ-Wing 369 hinged in r7c9; r9c9<>6 solves it.
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hughwill



Joined: 05 Apr 2010
Posts: 195
Location: Birmingham UK

PostPosted: Mon Feb 27, 2012 1:45 pm    Post subject: Feb 27 VH Reply with quote

Code:

+----------+--------+-----------+
| 5  8  69 | 2  3 4 | 1  7  69  |
| 4  1  7  | 6  8 9 | 3  2  5   |
| 2  69 3  | 7  1 5 | 49 46 8   |
+----------+--------+-----------+
| 7  5  8  | 34 9 1 | 6  34 2   |
| 3  2  4  | 5  6 8 | 7  9  1   |
| 69 69 1  | 34 7 2 | 8  5  34  |
+----------+--------+-----------+
| 1  4  69 | 8  5 7 | 2  36 369 |
| 8  3  2  | 9  4 6 | 5  1  7   |
| 69 7  5  | 1  2 3 | 49 8  469 |
+----------+--------+-----------+

Play this puzzle online at the Daily Sudoku site


Or, if you prefer, the nearby XYZ 469 does the same trick....
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ronk



Joined: 07 May 2006
Posts: 397

PostPosted: Mon Feb 27, 2012 3:30 pm    Post subject: Re: Feb 27 VH Reply with quote

hughwill wrote:
Code:

+----------+--------+-----------+
| 5  8  69 | 2  3 4 | 1  7  69  |
| 4  1  7  | 6  8 9 | 3  2  5   |
| 2  69 3  | 7  1 5 | 49 46 8   |
+----------+--------+-----------+
| 7  5  8  | 34 9 1 | 6  34 2   |
| 3  2  4  | 5  6 8 | 7  9  1   |
| 69 69 1  | 34 7 2 | 8  5  34  |
+----------+--------+-----------+
| 1  4  69 | 8  5 7 | 2  36 39+6|
| 8  3  2  | 9  4 6 | 5  1  7   |
| 69 7  5  | 1  2 3 | 49 8  46+9|
+----------+--------+-----------+

If BUGs are permitted for VH puzzles, there is a BUG+2. At least one of r7c9=6 and r9c9=9 must be true, which implies r7c9<>9.
[edit: correct quote]


Last edited by ronk on Mon Feb 27, 2012 5:05 pm; edited 1 time in total
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Clement



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

PostPosted: Mon Feb 27, 2012 4:12 pm    Post subject: Feb 27 VH Reply with quote

Also solved by the remote pairs on 96 which eliminate 69 in r9c9.
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