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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Fri Oct 15, 2010 4:31 am Post subject: Puzzle 10/10/15: B XY |
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| Code: | +-----------------------+
| . . . | 9 3 . | . . 7 |
| . . 9 | 8 . 1 | . 5 . |
| . 3 . | 6 5 2 | . . . |
|-------+-------+-------|
| 7 5 2 | 3 6 . | 1 9 . |
| 6 . 4 | 1 9 7 | . 3 . |
| . 9 1 | . 2 . | . . . |
|-------+-------+-------|
| . . . | 5 . . | 3 . . |
| . 2 . | 7 1 . | . 8 . |
| 1 . . | . . . | . . . |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Fri Oct 15, 2010 10:16 am Post subject: |
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Two steps...
| Quote: | kite(4) c2, r8 ; r2c7<>4
xy-chain ; (6=7)r6c8 - (7=4)r9c8 - (4=6)r9c2 - (6=4)r2c2 - (4=2)r2c1 - (2=6)r2c7 ; r1c8<>6 |
And definitely not a w-wing(64) with two pseudocells 
| Quote: | | w-wing(64) with pseudocells ; (6=7)r6c8-(7=4)r9c8 - r9c2=r2c3 - (4=2)r2c1-(2=6)r2c7 |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Fri Oct 15, 2010 4:29 pm Post subject: |
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| peterj wrote: | And definitely not a w-wing(64) with two pseudocells
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Fri Oct 15, 2010 9:35 pm Post subject: |
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Three standard pattern steps including an uncommon wing........
| Quote: | skyscraper (4)r9c28; r3c1,r2c7<>4
xy-wing 4-69 vertex (49)r7c1; r7c3,r9c6<>6
wxyz-wing(4579)r9c7; r8c7<>4
(4)r9c7;
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(5)r9c7-(5=2=6)r52c7-(6=4)r2c2-r9c2=(4)r8c1;
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(7)r9c7-(7=4)r9c8;
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(9)r9c7-(9=4)r3c7 |
Ted |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Oct 16, 2010 12:55 am Post subject: |
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XY-Wing (468)
Skyscraper (4)
XY-Wing (476), flightless with pincer transport |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Sat Oct 16, 2010 2:21 pm Post subject: |
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| tlanglet wrote: | | Three standard pattern steps including an uncommon wing........ |
Interesting last move - sort of half way between kraken cell and wxyz-wing? |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sat Oct 16, 2010 2:49 pm Post subject: |
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| peterj wrote: | | tlanglet wrote: | | Three standard pattern steps including an uncommon wing........ |
Interesting last move - sort of half way between kraken cell and wxyz-wing? |
Peter,
I thought it was a standard wxyz-wing. I don't think I have ever found one before, so maybe my understanding of a wxyz-wing is not correct. I do believe it is a Kraken cell but wanted to use the standard name in this post.
Ted |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Sat Oct 16, 2010 3:39 pm Post subject: |
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I don't know but I thought all the eliminations should be through a single bivalue or triple i.e. one strong link. Your (5) is using a short chain.
Nice move anyway! |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sat Oct 16, 2010 11:57 pm Post subject: |
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Peter,
I checked Sudopedia and you are correct; a wxyz -wing requires bivalues or triples. So I guess I am stuck calling it a Kraken cell.
I get into more trouble with names!!!!
Ted |
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