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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Mon Oct 13, 2008 5:32 am Post subject: NoChain -- Set A -- Puzzle 9 |
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I don't know if this puzzle is appropriate or not. Familiar technique habits may not help.
| Code: | +-----------------------+
| 5 8 . | . . . | . . . |
| 4 . . | . . . | 1 . . |
| . . 1 | . . 8 | 5 . 7 |
|-------+-------+-------|
| . . . | 9 . . | 6 1 5 |
| . . . | . . . | . . 2 |
| . . 4 | . . 1 | 8 . . |
|-------+-------+-------|
| . 6 9 | 1 . 3 | 4 . 8 |
| . . . | 2 . . | . 5 . |
| . . 5 | 8 4 . | 2 . 9 |
+-----------------------+ # NC_Set_A #9
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Asellus
Joined: 05 Jun 2007
Posts: 865
Location: Sonoma County, CA, USA
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| Posted: Mon Oct 13, 2008 8:36 am Post subject: |
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A 6-cell DP creates a binary pseudo-cell that serves as one end of a W-Wing and solves the puzzle in one step.
It can also be solved in about 4 steps with commonly used techniques. |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Mon Oct 13, 2008 1:17 pm Post subject: |
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| After the basic quad in R5, I found an ER on 6; a skyscraper on 6; and an x-wing on 7. Looks like there could be an xy or xyz wing out there but I can't find one. So right now I'm stuck. |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Mon Oct 13, 2008 1:48 pm Post subject: |
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| Asellus wrote: | A 6-cell DP creates a binary pseudo-cell that serves as one end of a W-Wing and solves the puzzle in one step.
It can also be solved in about 4 steps with commonly used techniques. |
Fantastic solution 
Here is the code I had after basics.
| Code: |
*-----------------------------------------------------------*
| 5 8 2367 | 367 1 26 | 9 23 4 |
| 4 2379 237 | 357 379 259 | 1 8 6 |
| 369 239 1 | 4 369 8 | 5 23 7 |
|-------------------+-------------------+-------------------|
| 378 237 2378 | 9 378 4 | 6 1 5 |
| 19 19 368 | 356 368 56 | 7 4 2 |
| 67 5 4 | 67 2 1 | 8 9 3 |
|-------------------+-------------------+-------------------|
| 2 6 9 | 1 5 3 | 4 7 8 |
| 78 4 78 | 2 69 69 | 3 5 1 |
| 13 13 5 | 8 4 7 | 2 6 9 |
*-----------------------------------------------------------*
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I started off with a UR <78> but then realized that the deletion was also removed by the following swordfish (or x-wing) on <7>, then a skyscraper on <6> and a w-wing <23>. But at this point, I am also stuck; will try again later with fresh eyes .....
Ted |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Mon Oct 13, 2008 8:22 pm Post subject: |
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| Code: | .------------------.------------------.------------------.
| 5 8 2367 | 367 1 26 | 9 23 4 |
| 4 2379 237 | 357 379 259 | 1 8 6 |
| 369 239 1 | 4 369 8 | 5 23 7 |
:------------------+------------------+------------------:
| 378 237 2378 | 9 378 4 | 6 1 5 |
| 19 19 368 | 356 368 56 | 7 4 2 |
| 67 5 4 | 67 2 1 | 8 9 3 |
:------------------+------------------+------------------:
| 2 6 9 | 1 5 3 | 4 7 8 |
| 78 4 78 | 2 69 69 | 3 5 1 |
| 13 13 5 | 8 4 7 | 2 6 9 |
'------------------'------------------'------------------' |
skyscraper
x-wing
xyz-wing
xy-wing |
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Mon Oct 13, 2008 8:29 pm Post subject: |
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After basics,
| Code: |
+--------------------------+--------------------------+--------------------------+
| 5 8 2367# | 367# 1 26 | 9 23 4 |
| 4 2379 237 | 357 379 259 | 1 8 6 |
| 369 239 1 | 4 369 8 | 5 23 7 |
+--------------------------+--------------------------+--------------------------+
| 378 237 2378 | 9 378 4 | 6 1 5 |
| 19 19 368* | 35-6 3-68 5-6 | 7 4 2 |
| -67 5 4 | 67* 2 1 | 8 9 3 |
+--------------------------+--------------------------+--------------------------+
| 2 6 9 | 1 5 3 | 4 7 8 |
| 78 4 78 | 2 69 69 | 3 5 1 |
| 13 13 5 | 8 4 7 | 2 6 9 |
+--------------------------+--------------------------+--------------------------+
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a (generalized) m-wing (6)r6c4=r5c3 via sl (7) in row 1; r6c1,r5c456<>6
solves the puzzle in one step.
---
(edited twice: once to add "generalized" to the m-wing, and then - seeing Asellus' post right after mine, to add this "edited" paragraph)
Last edited by nataraj on Mon Oct 13, 2008 8:53 pm; edited 2 times in total |
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Asellus
Joined: 05 Jun 2007
Posts: 865
Location: Sonoma County, CA, USA
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| Posted: Mon Oct 13, 2008 8:30 pm Post subject: |
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The <7> fish reveals a useful XYZ Wing.
If anyone is curious, the DP is on 139 in c13. The pseudo-binary is {26} in r3c12, forming a W-Wing with r1c6 via the <2>s in c8 and removing <6> from r1c3. |
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Mon Oct 13, 2008 8:42 pm Post subject: |
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very elegant solution, Asellus, to use the 26 virtual cell as one end of a w-wing! Something to remember, for sure. I usually only scan for immediate naked-pair-type eliminations ...
_________
on an unrelated topic:
499 is not the end, I hope ! |
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ravel
Joined: 21 Apr 2006
Posts: 536
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| Posted: Tue Oct 14, 2008 8:24 pm Post subject: |
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| nataraj wrote: | on an unrelated topic:
499 is not the end, I hope ! |
Hehe, i was not aware of this number.
It's just, that i am a bit short of time and - at the first - short of good ideas. Always when i tried a puzzle here recently, i already found a solution, that was at least as good as mine.
Such puzzles containing a nugget, which Asellus found here, are not posted here and there every month - tributs to Danny also. |
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Tue Oct 14, 2008 8:41 pm Post subject: |
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great! "we" passed the magic one 
being a bit short on time myself, this place feels like one of those bars where you drop in at the end of a busy day and get transported to another universe ... (I seem to remember there was a bar like that in Key West) and, sometimes, a challenging puzzle to make my day  |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Tue Oct 14, 2008 11:07 pm Post subject: |
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| Quote: | | I seem to remember there was a bar like that in Key West |
the cantina in star wars? sorry, its the most rediculous thought that came to mind. |
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