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July 13 VH

 
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nataraj



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

PostPosted: Sun Jul 13, 2008 10:13 am    Post subject: July 13 VH Reply with quote

A quite regular very hard: Fast start, no "fancy" stuff (one useless m-wing 28-38-28-25, not quite useless, but all it does is remove 2 from r3c1, so I kept looking for something better), but a very powerful xy wing, which solves the puzzle (45-48-58 boxes 8 and 9, to remove 5 from r9c5)
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Earl



Joined: 30 May 2007
Posts: 677
Location: Victoria, KS

PostPosted: Sun Jul 13, 2008 1:45 pm    Post subject: July 13 VH Reply with quote

A w-wing (45) also does it.

Earl
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Marty R.



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

PostPosted: Sun Jul 13, 2008 5:39 pm    Post subject: Reply with quote

My M-Wing removed the 2 from r7c1 which was all that was needed. I then tried it online, but couldn't arrive at my pencil-and-paper position.
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wapati



Joined: 10 Jun 2008
Posts: 472
Location: Brampton, Ontario, Canada.

PostPosted: Sun Jul 13, 2008 6:05 pm    Post subject: Reply with quote

How do you guys get the puzzle to paper to solve it?

I use sudoku monkey, http://www.jcraner.com/files.html
to capture the digits, then I paste them into soduku cue and print from there.

Thanks.

This M-wing does the same elimination as the xy-wing.


Code:
.---------------.---------------.---------------.
| 38   6    4   | 38   79   5   | 1    79   2   |
| 239  5    237 | 36   1    26  | 48   79   48  |
| 289  1    27  | 4    79   28  | 3    6    5   |
:---------------+---------------+---------------:
| 7    9    8   | 5    2    1   | 6    4    3   |
| 6    2    5   | 9    3    4   | 7    8    1   |
| 13   4    13  | 67   8    67  | 2    5    9   |
:---------------+---------------+---------------:
| 25   7    6   | 28  #45   3   | 9    1   #48  |
| 125  8    12  | 27   456  9   |#45@  3    67  |
| 4    3    9   | 1    6-5  78  | 58@  2    67  |
'---------------'---------------'---------------'
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Clement



Joined: 24 Apr 2006
Posts: 1110
Location: Dar es Salaam Tanzania

PostPosted: Sun Jul 13, 2008 6:44 pm    Post subject: Daily Sudoku: Sun 13 Jul-2008 VH Reply with quote

An XY-Wing 458 Pivot r7c9{4,8} with Pincers in r7c5{4,5} and r9c7{5,8} eliminating 5 in r9c5 solving the puzzle.
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keith



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

PostPosted: Sun Jul 13, 2008 7:46 pm    Post subject: Reply with quote

wapati wrote:
How do you guys get the puzzle to paper to solve it?

I use sudoku monkey, http://www.jcraner.com/files.html
to capture the digits, then I paste them into soduku cue and print from there.

Thanks.
Just click on the image of the daily puzzle and you will get a PDF page to print. For archive puzzles, there is a print button to get the PDF page.

I use Sudoku Susser to save puzzles. Right click on the image of the puzzle, and select "Copy Image". Then, paste it on the Susser screen. (I hate the puzzle grids that Susser prints. They are too large.)

Keith
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nataraj



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

PostPosted: Sun Jul 13, 2008 8:11 pm    Post subject: Reply with quote

wapati wrote:
This M-wing does the same elimination as the xy-wing.


And the w-wing mentioned by Earl is in the same two boxes (45 in box 8 and 9 connected via strong link on 5 in row 9) and leads to the same eliminations/solved cells (r8c5<>4, r7c5=4, r7c9=8, r9c7=5, r9c5=6) as the xy-wing or the m-wing ...
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cgordon



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

PostPosted: Sun Jul 13, 2008 10:44 pm    Post subject: Reply with quote

I thought this was a definitively excellent VH. After the basics - which I thought were challenging - it took me forever to find the xy wing. Remember them !!
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storm_norm



Joined: 18 Oct 2007
Posts: 1741

PostPosted: Mon Jul 14, 2008 8:51 am    Post subject: Reply with quote

very nice puzzle
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wapati



Joined: 10 Jun 2008
Posts: 472
Location: Brampton, Ontario, Canada.

PostPosted: Mon Jul 14, 2008 10:11 am    Post subject: Reply with quote

keith wrote:
wapati wrote:
How do you guys get the puzzle to paper to solve it?
Just click on the image of the daily puzzle and you will get a PDF page to print. For archive puzzles, there is a print button to get the PDF page.

I use Sudoku Susser to save puzzles. Right click on the image of the puzzle, and select "Copy Image". Then, paste it on the Susser screen. (I hate the puzzle grids that Susser prints. They are too large.)

Keith


Thanks keith, it works for me!
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cathyv



Joined: 25 Apr 2008
Posts: 7
Location: Danbury, CT

PostPosted: Tue Jul 15, 2008 1:02 am    Post subject: Reply with quote

Being fairly new to finding w-wings, can you guys verify if I found one correctly? From the grid above, 45 in r78c57 connected by strong link on 5 in c1 eliminates 4 from r8c5.... leaving the naked 56 in box 8 which solves the puzzle?

Thanks for all the tips along the way....Cathy
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wapati



Joined: 10 Jun 2008
Posts: 472
Location: Brampton, Ontario, Canada.

PostPosted: Tue Jul 15, 2008 1:35 am    Post subject: Reply with quote

Those 45s are good and the c1 5s make it work. You can eliminate 4 from r7c9 as well.

You could use the 5s in row 9 instead of the 5s in c1, if you felt like it!
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