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Oct 20 VH

 
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roaa



Joined: 18 Apr 2009
Posts: 112
Location: Sweden

PostPosted: Tue Oct 20, 2015 9:03 am    Post subject: Oct 20 VH Reply with quote

At least two XY-wings 349 solves it.
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hughwill



Joined: 05 Apr 2010
Posts: 422
Location: Birmingham UK

PostPosted: Tue Oct 20, 2015 9:23 am    Post subject: Re: Oct 20 VH Reply with quote

Code:

+--------+-------------+-----------+
| 4 5  8 | 2   6   39  | 1  39  7  |
| 6 1  3 | 78  78  49  | 5  2   49 |
| 9 7  2 | 1   34  5   | 34 6   8  |
+--------+-------------+-----------+
| 7 2  1 | 389 389 6   | 34 349 5  |
| 5 3  9 | 47  47  2   | 8  1   6  |
| 8 6  4 | 5   39  1   | 2  7   39 |
+--------+-------------+-----------+
| 3 4  7 | 6   1   8   | 9  5   2  |
| 2 89 6 | 349 5   349 | 7  348 1  |
| 1 89 5 | 349 2   7   | 6  348 34 |
+--------+-------------+-----------+

Play this puzzle online at the Daily Sudoku site

roaa wrote:
At least two XY-wings 349 solves it.


Three, if you count the unusual combo in boxes 3 and 6 as two.
Otherwise, no more interesting solutions...........?

Hugh
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Tue Oct 20, 2015 3:53 pm    Post subject: Reply with quote

Quote:
Otherwise, no more interesting solutions...........?


Some of us, including yours truly, like to solve these using only the standard VH moves, i.e. X- ,XY- and XYZ-wings.

However, departing from those moves, the DP 48-49-89 might qualify as interesting. To break up the DP, there needs to be a 3 in either r89c4 or r89c8. These two yield a common outcome.
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