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May 6 VH
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sheryl



Joined: 24 Sep 2007
Posts: 64
Location: New York

PostPosted: Tue May 06, 2008 11:04 pm    Post subject: Reply with quote

okay here's the thing. i never saw a UR the 3 was already gone. the interesting thing is that the puzzle solves. i checked my numbers they are all different no duplicates in any row column or box. but the problem is i can xx around the 2s and 9s and solve it also. I know that that makes it an illegal puzzle, but it's solved. Rolling Eyes it's easier to start over when the puzzle doesn't solve than when it does. oh well,maybe tomorrow just to see how it resolves.
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crunched



Joined: 05 Feb 2008
Posts: 168

PostPosted: Tue May 06, 2008 11:29 pm    Post subject: Reply with quote

I found the UR, solved the puzzle and gave my self high fives.
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nataraj



Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria

PostPosted: Wed May 07, 2008 6:36 am    Post subject: Reply with quote

smileys:

when one clicks on the emoticon, a character string appears in the text. Like :) or :D or :roll:, :idea: etc.

If smileys are enabled (either per default in the user profile or by un-checking the box below the text) then the smileys appear in graphical representation in the final post and others can see the images.

If smileys are disabled (either in the profile or by checking the box "Disable Smilies in this post") then the text string appears as it is. Sometimes this is necessary, otherwise strings like (35-58) come out as the "cool" emoticon at the end.

cgordon, the way you describe what happens, I think you might have smileys disabled.
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cgordon



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

PostPosted: Wed May 07, 2008 11:59 am    Post subject: Reply with quote

Quote:
cgordon, the way you describe what happens, I think you might have smileys disabled.


Thank you. Laughing Razz Smile Wink Very Happy Razz
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nataraj



Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria

PostPosted: Wed May 07, 2008 3:05 pm    Post subject: Reply with quote

Very Happy - you are welcome
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montalbano1944



Joined: 26 Apr 2008
Posts: 6

PostPosted: Wed May 07, 2008 10:30 pm    Post subject: Reply with quote

In strict mathematical terms a puzzle has a unique solution when there is one and only one solution. Looks like our puzzle actually has at least 3 solutions. Two of these use 2's and 9's at the corners of the UR, and the "unique" solution keeps the 3 in R8,C1. In a sense we are forcing uniqueness by picking the 3.
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nataraj



Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria

PostPosted: Thu May 08, 2008 9:21 pm    Post subject: Reply with quote

montalbano1944 wrote:
Looks like our puzzle actually has at least 3 solutions.


Not at all.

It has only one solution.

Please post the other 2 so called "solutions" (the ones with the interchangeable twos and nines) and I am sure people here will be glad to point out the error.

(Hint: there is a solution path using the x-wing and xy-wing and it arrives at a unique solution)
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RobertRattley



Joined: 24 Jun 2007
Posts: 118
Location: Australia

PostPosted: Sun May 11, 2008 5:10 pm    Post subject: Reply with quote

I agree with nataraj. that there's one solution to be reached by the usual uncontroversial "advanced" techniques. I needed an xyz-wing (and a couple of tricky triples) before reaching an x-wing and an xy-wing.

Altogether a most enjoyable and very "very hard" puzzle. (I also don't like URs etc)
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