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Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
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 Posted: Wed Mar 31, 2010 2:19 am Post subject: March 31 VH |
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The old reliable does it again.
Solution: 126 xy-wing
Early Earl |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Wed Mar 31, 2010 3:29 am Post subject: |
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Here is a one step solution that is not the "old reliable"; a hidden pair.
hp56[(56)r79c1 = (2)r7c1]r79c1 - r7c89 = r8c7 - (2=6)r2c7 - r2c6 = r3c6; r3c1<>6.
Ted |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Mar 31, 2010 4:47 am Post subject: |
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| tlanglet wrote: | Here is a one step solution that is not the "old reliable"; a hidden pair.
hp56[(56)r79c1 = (2)r7c1]r79c1 - r7c89 = r8c7 - (2=6)r2c7 - r2c6 = r3c6; r3c1<>6.
Ted |
If you're saying that a hidden pair is a one-stepper, then I think you're saying it required no more than basics, which is what I found. |
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Wed Mar 31, 2010 6:03 am Post subject: |
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A little more than basics is needed.
After basics:
| Code: |
+--------------------------+--------------------------+--------------------------+
| 4 3 16 | 9 7 2 | 8 15 56 |
| 7 5 126 | 3 8 16 | 26 4 9 |
| 26 8 9 | 15 4 156 | 7 12 3 |
+--------------------------+--------------------------+--------------------------+
| 89 1 4 | 58 2 3 | 59 6 7 |
| 3 2 5 | 67 69 79 | 1 8 4 |
| 89 6 7 | 4 1 58 | 3 259 25 |
+--------------------------+--------------------------+--------------------------+
| 256 7 3 | 18 69 18 | 4 259 256 |
| 1 4 26 | 67 5 79 | 269 3 8 |
| 56 9 8 | 2 3 4 | 56 7 1 |
+--------------------------+--------------------------+--------------------------+
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Starting from top left, the first cell that I looked at (r1c2) directly led to the solution: xy-wing. Going to get the second coffee now. |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Wed Mar 31, 2010 9:05 am Post subject: |
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I saw the xy-wing but searched longer and quickly found a nice 5-link xy-chain which is also a one-stepper...
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(1=6)r1c3-(6=5)r1c9-(5=1)r1c8-(1=2)r3c8-(2=6)r2c7-(6=1)r2c6; r1c3<>1 |
Seeing it has remote pairs on the end is this a special case of a W-wing? |
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Wed Mar 31, 2010 1:12 pm Post subject: |
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| peterj wrote: | I saw the xy-wing but searched longer and quickly found a nice 5-link xy-chain which is also a one-stepper...
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 I was not aware that there was a contest for the LONGEST chain ... 
But while I'm at it, might as well enter this beauty - it has 10 links (and of course it also solves the puzzle ...)
(6)r2c7-(6=5)r1c9-(5=1)r1c8-(1=2)r3c8-(2=6)r2c7-(6=5)r9c7-(5=9)r4c7-(9=8)r4c1-(8=5)r4c4-(5=1)r3c4-(1=6)r2c6-(6)r2c7; r2c7<>6
beautiful, just beautiful ...
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Wed Mar 31, 2010 3:46 pm Post subject: |
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I like the way your chain "eats" part of itself!  |
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Clement
Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
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| Posted: Wed Mar 31, 2010 3:49 pm Post subject: |
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| W-Wing 26 in r23c17 with a strong link 6 in row 9 eliminaing 2 in r3c8 solves the puzzle. |
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Wed Mar 31, 2010 4:42 pm Post subject: |
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| Mogulmeister wrote: | | I like the way your chain "eats" part of itself! |
yea, me too ...
At first I went like "Hey, is this possible? A chain that removes part of the chain itself?" but it is a valid chain alright. Weird, though.
Reminds me of those monstrous lobster-like beasts ("Dum-a chum", "dod-a-chock") with huge claws in the first chapter of Stephen King's "Drawing of the Three". Click-click, pincers waving, snap, eat, snap ... oops it's eaten itself
xy-wings never do that ... how boring |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Wed Mar 31, 2010 5:04 pm Post subject: |
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You're in the home of psychiatry there...I was just wondering if your chain could stand in for a Rorschach ink blot test.
Is it a crab ? A gun ? A dancer (landscape view) ?
Either way, style points for sure.
(My apologies to all who feel these observations are just too flippant) |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Wed Mar 31, 2010 7:59 pm Post subject: |
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| If there's such a thing as "chain envy", I've got it... |
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Wed Mar 31, 2010 8:11 pm Post subject: |
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Psychology, Vienna, Freud, Rohrschach test, chain envy ...
peterj and Mogulmeister, say no more ...
I never imagined what depths of interpretation could lurk in a simple daily "very hard" .
oops  did it again ... ok what I meant to say is "in a very difficult" |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Wed Mar 31, 2010 10:11 pm Post subject: |
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| nataraj wrote: | I was not aware that there was a contest for the LONGEST chain ...
But while I'm at it, might as well enter this beauty - it has 10 links (and of course it also solves the puzzle ...)
(6)r2c7-(6=5)r1c9-(5=1)r1c8-(1=2)r3c8-(2=6)r2c7-(6=5)r9c7-(5=9)r4c7-(9=8)r4c1-(8=5)r4c4-(5=1)r3c4-(1=6)r2c6-(6)r2c7; r2c7<>6
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Alternately a lasso: 14 bivalue cells (core from nataraj + extension)
(6=5)r1c9-(5=1)r1c8-(1=2)r3c8-(2=6)r2c7-(6=5)r9c7-(5=9)r4c7-(9=8)r4c1-(8=5)r4c4-(5=1)r3c4-(1=6)r2c6-(6=2)r2c7-(2=1)r3c8-(1=5)r1c8-(5=6)r1c9; => r1c9=6 |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Thu Apr 01, 2010 6:34 am Post subject: |
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ja, aber wo ist das Diagramm?
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Thu Apr 01, 2010 6:10 pm Post subject: |
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looking for a diagram ?
like this one, maybe ? 
...
Aaaahhh ... a LASSO diagram ...
sorry. we don't carry these here |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Thu Apr 01, 2010 8:01 pm Post subject: |
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| nataraj wrote: | Psychology, Vienna, Freud, Rohrschach test, chain envy ...
peterj and Mogulmeister, say no more ...
I never imagined what depths of interpretation could lurk in a simple daily "very hard" .
oops did it again ... ok what I meant to say is "in a very difficult" |
Or, as Freud is reputed to have said, "Sometimes a cigar is only a cigar".
Keith |
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Thu Apr 01, 2010 8:29 pm Post subject: |
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| keith wrote: |
Or, as Freud is reputed to have said, "Sometimes a cigar is only a cigar".
Keith |
Thanks, Keith. That's reassuring. If even old Siegmund said a thing like that, we can safely go on discussing our sudoku techniques.
Honi soit qui mal y pense. |
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Wendy W
Joined: 04 Feb 2008
Posts: 144
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| Posted: Fri Apr 02, 2010 12:21 am Post subject: |
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I don't know what it was about this puzzle, but I started it literally five times and kept messing up. *Finally* got it with two X-wings (2 and 7) and an XY-wing (126) but it was a bear.
I should add that I live on a one-lane gravel road. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Fri Apr 02, 2010 2:19 am Post subject: |
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nataraj,
Thank you. This kind of exchange puts a smile on my face for days.
Given my passion and preoccupation, I think my wife may not agree: | Quote: | | "Sometimes, a Sudoku is only a Sudoku." |
Best wishes,
Keith
Last edited by keith on Fri Apr 02, 2010 4:08 pm; edited 1 time in total |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Fri Apr 02, 2010 3:53 pm Post subject: |
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Only a cigar/sudoku ?
Remember that cigars finally did for Freud.
Has anyone died of a sudoku related illness yet ? |
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