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Jun 19 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
PostPosted: Fri Jun 18, 2010 10:24 pm    Post subject: Jun 19 VH Reply with quote
XY-Wing 29 12 19 removes 9 in r7c1 solving the puzzle.
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Mindwarp



Joined: 13 Sep 2007
Posts: 25
Location: St. Ives, England
PostPosted: Fri Jun 18, 2010 11:49 pm    Post subject: Reply with quote
Gave up on this one. Certainly didn't find Clement's XY wing.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sat Jun 19, 2010 1:05 am    Post subject: Reply with quote
Mindwarp, this was my grid after basics. Look for the Wing pivoted in box 9.

Code:

+--------------+---------+------------+
| 4   8   39   | 1  2  5 | 39  7   6  |
| 159 357 2    | 38 79 6 | 139 158 4  |
| 6   357 1379 | 38 79 4 | 2   158 59 |
+--------------+---------+------------+
| 8   9   5    | 7  6  1 | 4   3   2  |
| 7   2   4    | 9  8  3 | 5   6   1  |
| 3   1   6    | 4  5  2 | 7   9   8  |
+--------------+---------+------------+
| 259 45  8    | 6  14 7 | 19  125 3  |
| 29  347 379  | 5  14 8 | 6   12  79 |
| 15  6   17   | 2  3  9 | 8   4   57 |
+--------------+---------+------------+

Play this puzzle online at the Daily Sudoku site
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Mindwarp



Joined: 13 Sep 2007
Posts: 25
Location: St. Ives, England
PostPosted: Sat Jun 19, 2010 4:00 am    Post subject: Reply with quote
Thanks Marty. I see where my problem lay, I was at the previous step to your grid, I hadn't noticed that in the bottom left box 1 had to be on the bottom row of that box and so hadn't excluded the 1s in the other three cells as soon as I did that and got to your stage of the grid where the XY wing does it. I really shouldn't do these puzzles when I'm so tired.
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