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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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 Posted: Sun Jul 13, 2008 10:13 am Post subject: July 13 VH |
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| 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
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| Posted: Sun Jul 13, 2008 1:45 pm Post subject: July 13 VH |
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A w-wing (45) also does it.
Earl |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Jul 13, 2008 5:39 pm Post subject: |
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| 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.
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| Posted: Sun Jul 13, 2008 6:05 pm Post subject: |
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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: 1111
Location: Dar es Salaam Tanzania
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| Posted: Sun Jul 13, 2008 6:44 pm Post subject: Daily Sudoku: Sun 13 Jul-2008 VH |
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| 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
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| Posted: Sun Jul 13, 2008 7:46 pm Post subject: |
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| 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.
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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
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| Posted: Sun Jul 13, 2008 8:11 pm Post subject: |
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| wapati wrote: | This M-wing does the same elimination as the xy-wing.
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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
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| Posted: Sun Jul 13, 2008 10:44 pm Post subject: |
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| 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
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| Posted: Mon Jul 14, 2008 8:51 am Post subject: |
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| very nice puzzle |
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wapati
Joined: 10 Jun 2008
Posts: 472
Location: Brampton, Ontario, Canada.
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| Posted: Mon Jul 14, 2008 10:11 am Post subject: |
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| keith wrote: | | wapati wrote: | How do you guys get the puzzle to paper to solve it?
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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
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| Posted: Tue Jul 15, 2008 1:02 am Post subject: |
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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.
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| Posted: Tue Jul 15, 2008 1:35 am Post subject: |
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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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