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Another one while we wait

 
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nataraj



Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
PostPosted: Sun Apr 13, 2008 10:19 am    Post subject: Another one while we wait Reply with quote
From "Die Presse"

Just a regular "hard" puzzle most of the way. Then comes the "vh" part quite late in the game, at which point there are a number of possibilities: multi-coloring, xy-wings, or UR.
Code:

+-----------+-----------+-----------+
|  .  .  7  |  .  .  .  |  4  .  .  |
|  .  2  .  |  .  .  .  |  .  1  .  |
|  1  .  .  |  8  9  6  |  .  .  2  |
+-----------+-----------+-----------+
|  .  .  .  |  .  1  .  |  .  .  .  |
|  .  .  8  |  9  7  2  |  6  .  .  |
|  .  9  .  |  .  3  .  |  .  4  .  |
+-----------+-----------+-----------+
|  .  .  .  |  5  .  3  |  .  .  .  |
|  .  8  .  |  .  .  .  |  .  5  .  |
|  .  6  3  |  .  .  .  |  8  9  .  |
+-----------+-----------+-----------+

play online
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sun Apr 13, 2008 3:53 pm    Post subject: Reply with quote
After the basics, I didn't check for the various possibilities, but noticed a multi-coloring on 7 which finished it up.
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storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Sun Apr 13, 2008 8:44 pm    Post subject: Reply with quote
xy-wing 1,2,7

have to take care of some extra candidates
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