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Do the June 4 Very Hard at the previous weekend!
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prakash



Joined: 02 Jan 2008
Posts: 67
Location: New Jersey, USA

PostPosted: Wed Jun 04, 2008 11:59 pm    Post subject: Reply with quote

Norm - Just wondering what tool you were using to generate the visual. I would love to have somthing like that when I try to do it with PP. I cannot seem to print with Markups.
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storm_norm



Joined: 18 Oct 2007
Posts: 1741

PostPosted: Thu Jun 05, 2008 1:19 am    Post subject: Reply with quote

prakash,

there are several programs you can use.
personally, i would suggest "Sudoku Susser".
you can get here...
http://www.madoverlord.com/projects/sudoku.t

the image you see in my posts are generated by saving a screen shot of another sudoku assisting program named "sudocue".
you can get here...
http://www.sudocue.net/download.php

and another very good assisting program is "Sudoku Explainer"
you can get here...
http://diuf.unifr.ch/people/juillera/Sudoku/Sudoku.html

just a note about "Sudoku Explainer". I had to make sure I installed Java runtime 5 or greater for it to run. so you might want to make sure and get all the updates for Java.
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Sun Jun 08, 2008 12:30 pm    Post subject: Reply with quote

I only did this one yesterday:
Code:
+------------+---------+------------+
| 39  4   1  | 5 6  8  | 2  39  7   |
| 36  68  7  | 2 9  1  | 4  38  5   |
| 29  258 59@| 3 4  7  |69@ 1   689 |
+------------+---------+------------+
| 5   7   8  | 9 2  4  | 3  6   1   |
| 4   3   6  | 1 7  5  | 8  29  29  |
| 1   9   2  | 8 3  6  | 5  7   4   |
+------------+---------+------------+
|269$ 1   4  | 7 58 29 |69# 58  3   |
| 8   256 59#| 4 1  3  | 7 259$ 269$|
| 7   25  3  | 6 58 29 | 1  4   289 |
+------------+---------+------------+
There is an incredibly obvious skyscraper - any cell ($) that sees both cells # cannot be <9>.

Which opens up a (29, 26, 69) XY-wing in C1 R7, taking out <9> in R3C7.

Keith


Last edited by keith on Mon Jun 09, 2008 3:53 am; edited 1 time in total
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nataraj



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

PostPosted: Sun Jun 08, 2008 8:54 pm    Post subject: Reply with quote

keith wrote:
incredibly obvious


go ahead ... rub it in ... can't believe I missed that. Guess I was past the point of looking for coloring solutions.
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Sun Jun 08, 2008 11:56 pm    Post subject: Reply with quote

nataraj wrote:
keith wrote:
incredibly obvious


go ahead ... rub it in ... can't believe I missed that. Guess I was past the point of looking for coloring solutions.


nataraj: "Rub it in?" Not at all.

As is my usual procedure, I start only with two-candidate pencil marks. So, I found the skyscraper pairs before I knew what they might eliminate.

I was surprised. Usually, the usefulness of these possible skyscrapers is taken up by box-line interactions.

Keith
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Glassman



Joined: 21 Oct 2005
Posts: 50
Location: England

PostPosted: Wed Jun 18, 2008 1:42 pm    Post subject: Reply with quote

keith wrote:
... There is an incredibly obvious skyscraper ... Which opens up a (29, 26, 69) XY-wing in C1 R7, taking out <9> in R3C7.

I read this topic with some disbelief — they do like complicated methods — then, at last, I found that you, Keith, had also seen the skyscraper!

... which also opened up a second xy-wing with pivot at r8c9, eliminating the 9 at r9c9.

Glassman Cool
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