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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sat Dec 20, 2008 10:51 pm Post subject: Set G Puzzle 82 |
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| Code: | +-----------------------+
| 1 9 . | . . 3 | 5 7 . |
| 5 . . | 2 7 . | . . 9 |
| . . . | 8 . . | . 3 . |
|-------+-------+-------|
| . 6 9 | 7 . . | . . . |
| . 7 . | . . . | . 6 . |
| 8 . . | . . 9 | . . . |
|-------+-------+-------|
| 9 . . | . . . | . . 5 |
| 7 . 1 | . 3 . | . 9 . |
| . 2 . | . . . | 7 . . |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Sun Dec 21, 2008 1:30 am Post subject: |
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| Code: | .---------------------.---------------------.---------------------.
| 1 9 28 | 6 4 3 | 5 7 28 |
| 5 38 368 | 2 7 1 | 468 48 9 |
| 26 4 7 | 8 9 5 | 126 3 126 |
:---------------------+---------------------+---------------------:
| 234 6 9 | 7 128 248 | 12348 5 12348 |
| 234 7 2345 | 35 128 248 | 9 6 12348 |
| 8 1 2345 | 35 6 9 | 234 24 7 |
:---------------------+---------------------+---------------------:
| 9 38 3468 | 1 28 7 | 23468 248 5 |
| 7 5 1 | 4 3 268 | 268 9 268 |
| 346 2 3468 | 9 5 68 | 7 1 3468 |
'---------------------'---------------------'---------------------' |
| Quote: | 1. x-wing 8
2. UR24 r45c16 means r9c1 <> 3, and r56c3 <> 3
3. xy-wing {3,4,8}... (3=8)r7c2 - (8=4)r7c8 - (4=3)r9c9; r9c13 <> 3 |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Dec 21, 2008 2:29 am Post subject: |
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| I used eight steps, but probably would've used fewer if I looked for X-Wings earlier. I had URs, an ER, XY-Wing, W-Wing, two X-Wings and an XY-Wing with pincer transport as the finisher. |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Sun Dec 21, 2008 4:28 pm Post subject: |
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| Whoa that was a struggle. Started with a couple of Type 4 URs and a couple of ERs - but then I whittled away at so many xy wings -I lost count. But I finally slayed the beast. |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sun Dec 21, 2008 8:07 pm Post subject: |
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After reviewing the previous posts, I find that I used the most steps: NINE  I had a similar mix of techniques as already noted.
But I did come across another interesting circumstance as follows.
| Code: |
*-----------------------------------------------------------*
| 1 9 28 | 6 4 3 | 5 7 28 |
| 5 38 36 | 2 7 1 | 46 48 9 |
| 26 4 7 | 8 9 5 | 12 3 126 |
|-------------------+-------------------+-------------------|
| 234 6 9 | 7 18 248 | 1348 5 134 |
| 234 7 245 | 35 18 248 | 9 6 1348 |
| 8 1 45 | 35 6 9 | 34 2 7 |
|-------------------+-------------------+-------------------|
| 9 38 346 | 1 2 7 | 346 48 5 |
| 7 5 1 | 4 3 68 | 28 9 268 |
| 346 2 348 | 9 5 68 | 7 1 346 |
*-----------------------------------------------------------*
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I was searching the code above looking for an extended xy-wing and I found one: pivot <48> in r7c8, pincer <28> in r8c7 and pseudo-cells <48> and <28> in b3. This provides deletion of <2>s in r3c7 & r8c9.
Now look at the W-wing <28> in r1c9 & r8c7 with strong ling <8> in c8. It is the extended xy-wing
So what do we call this situation 
And Danny, it was a great puzzle.
Ted |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Sun Dec 21, 2008 10:19 pm Post subject: |
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| tlanglet wrote: | Now look at the W-wing <28> in r1c9 & r8c7 with strong ling <8> in c8. It is the extended xy-wing
So what do we call this situation
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A W-Wing that coincides to a 4-cell XY-Chain having identical endpoint cells. Impressive!
| Quote: | And Danny, it was a great puzzle.
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Thanks, this makes searching through a stack of potential puzzles worth it!
Last edited by daj95376 on Sun Dec 21, 2008 10:37 pm; edited 2 times in total |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sun Dec 21, 2008 10:26 pm Post subject: |
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| daj95376 wrote: | | tlanglet wrote: | Now look at the W-wing <28> in r1c9 & r8c7 with strong ling <8> in c8. It is the extended xy-wing
So what do we call this situation
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A W-Wing that coincides with a 4-cell XY-Chain having identical endpoint cells and identical body cells. Impressive! |
I have worked on two more puzzles since my prior post and found two more instances of the same circumstances. Maybe this is not all that uncommon.
Ted |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Sun Dec 21, 2008 10:47 pm Post subject: |
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| tlanglet wrote: | I have worked on two more puzzles since my prior post and found two more instances of the same circumstances. Maybe this is not all that uncommon.
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A 4-cell XY-Chain seems common to me. I don't have a feel for how common they are with identical endpoint cells. I think this forces the body cells to be identical as well.
This will always correspond to the general W-Wing
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Mon Dec 22, 2008 2:58 am Post subject: |
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FWIW, there really isn't anything we can discuss about seeing two different techniques that are absolutely correct for the cells they use.
its a coincedence that is... umm...
step right up
step right up
choose your path through the maze and don't get stuck
that's right, each path has its ending, each path has its twists
but you will still end up at the same place...
step right up
step right up. |
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