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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Tue Jun 01, 2010 4:23 pm Post subject: Puzzle 10/06/01: (C) |
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| Code: | +-----------------------+
| . 8 . | 7 . . | . 6 5 |
| 7 . 9 | . 5 . | . 1 . |
| . 5 6 | . . 1 | . . . |
|-------+-------+-------|
| 5 . . | 6 . 4 | . 7 . |
| . 4 . | . 1 7 | . . . |
| . . 2 | 5 8 9 | . 4 . |
|-------+-------+-------|
| . . . | . . . | . . . |
| 2 9 . | 1 . 8 | . 5 . |
| 4 . . | . . . | . . 1 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Wed Jun 02, 2010 9:39 am Post subject: |
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| I'll name it in two wrote: | 1)Skyscraper on 3s
2) (9)r1c7-(9=8)r4c7-r9c7=r9c8-(8=9)r3c8-(9)r1c7; r1c7<>9
Or if you don't like contradictions you can see step (2) as Remote Pair 89 eliminating the 9 in r1c7 |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Wed Jun 02, 2010 10:53 am Post subject: |
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| Same as mm - but isn't that last move a classic w-wing(89)? |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Wed Jun 02, 2010 1:44 pm Post subject: |
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I started with an ER 3, which had the same results as the skyscraper, but then chased a fun ANP()
ANP(4=29)r79c4 - (29=48)r23c4 - (4=9)r3c5 - (9=8)r3c8 - (8=4)r2c9; r2c4,r7c9<>4
before finding the w-wing 89.
Ted |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Wed Jun 02, 2010 1:58 pm Post subject: |
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| peterj wrote: | | Same as mm - but isn't that last move a classic w-wing(89)? |
Well - the w-wing was in its infancy as a definition when I left these waters last time so I'm sure you're right, Peter. I had a vague memory of this:
| Keith in December 2007 wrote: | | A number of people seem to know this, but I have not been able to find it written down anywhere: If two cells that are not peers have the same two candidates, and can be connected by a chain of an odd number of strong links in one of the candidates, the two cells are a remote pair. |
[Ed semi-remote ??]
Either way Keith, forgive me if I have quoted you inaccurately or out of context.  |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Wed Jun 02, 2010 3:12 pm Post subject: |
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On further reading the definitions that took place I see this is a w-wing.
I tend to see non-peer bivalues with the same candidates as variations on a theme.
[Ed - typo "bivalues"] |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Fri Jun 04, 2010 12:53 am Post subject: |
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I used an ER (3) which conveniently opened up a puzzle ending W-Wing (89).
Is that the way you planned it Danny? |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Fri Jun 04, 2010 1:34 am Post subject: |
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| Marty R. wrote: | I used an ER (3) which conveniently opened up a puzzle ending W-Wing (89).
Is that the way you planned it Danny? |
I never plan for an M/W-Wing ... unless ... my solver says they probably will be needed. If this happens, then the puzzle would qualify for an Advanced rating.
I know that M/W-Wings can save several steps ... and I don't have a problem with them and other techniques being used.
Regards, Danny |
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