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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Fri Jan 23, 2009 7:38 pm Post subject: Set NNP Puzzle 56 |
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This is not a single-stepper VH+!
| Code: | +-----------------------+
| 6 8 . | . . 9 | . 5 3 |
| 9 . . | . . 3 | 8 . . |
| . . 3 | . . . | 6 . . |
|-------+-------+-------|
| . . . | 4 . . | 9 . . |
| . . . | . 3 . | . 2 . |
| 1 2 . | . . 6 | 5 . . |
|-------+-------+-------|
| . 6 1 | 3 . 4 | . 9 . |
| 3 . . | . 6 . | 4 8 2 |
| 7 . . | . . . | . 6 . |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site
===== ===== ===== ===== ===== ===== ===== ===== ===== New Ratings
Can be solved using steps from ...
Basics: Naked/Hidden Single, Naked Pair/Triple, Locked Candidate 1/2
Basics+: Naked Quad, Hidden Pair/Triple/Quad
VH: BUG+1, UR Type 1, X-Wing, XY-Wing, XYZ-Wing
VH+: 2-String Kite, Empty Rectangle, Remote Pair, Skyscraper, Colors, UR Type 2
Advanced: finned/Sashimi X-Wing, Multiple Colors, Swordfish, M-Wing, W-Wing, XY-Chain
Extreme: Jellyfish, (but mostly) Chain |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sun Jan 25, 2009 11:03 pm Post subject: |
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A great VH+ puzzle!!!!
A skyscraper, a Kraken x-wing , a good fashion xy-wing and another xy-wing with a 3-cell pseudo-cell.
So when does a xy-wing with an extended pseudo-cell become a xy-chain? Here is the code prior to my last step in this puzzle.
| Code: |
*-----------------------------------------------------------*
| 6 8 47 | 17 147 9 | 2 5 3 |
| 9 1 2 | 6 5 3 | 8 4 7 |
| 45 57 3 | 28 24 278 | 6 1 9 |
|-------------------+-------------------+-------------------|
| #58 3 #56 | 4 12 12 | 9 7 #68 |
| #48 79 4679 | 589 3 578 | 1 2 468 |
| 1 2 479 | 89 79 6 | 5 3 #48 |
|-------------------+-------------------+-------------------|
| 2 6 1 | 3 8 4 | 7 9 5 |
| 3 59 59 | 17 6 17 | 4 8 2 |
| 7 4 8 | 259 29 25 | 3 6 1 |
*-----------------------------------------------------------* |
At this point, I was looking for xy-wings and noticed the <68> & <48> cells in box6. I then started to look for a <46> cell visible to the <68> pivot and saw the 3-cell sequence in box4: <65>, <58>, and <84> which forms a <46> pseudo-cell that provides two deletions. This set of five cells is also a xy-chain. Should a 4-cell sequence still be a xy-wing , but become a xy-chain if 5 or more cells are involved? Comments 
Ted
P.S. Also note that four of these cells form a w-wing48 with a strong link on <8> in row4. |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Mon Jan 26, 2009 12:48 am Post subject: |
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| tlanglet wrote: | So when does a xy-wing with an extended pseudo-cell become a xy-chain?
Should a 4-cell sequence still be a xy-wing , but become a xy-chain if 5 or more cells are involved?
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I learned about an XY-Wing based on the pivot/vertex cell and the two wing cells. Later, I learned about an XY-Chain ... and that an XY-Wing and a 3-cell XY-Chain were different perspectives on the same three cells (and eliminations).
I presume an extended XY-Wing is just a convenient way to describe how a 4-cell (and higher) XY-Chain was located ... and a transported chain is just a way to describe how a general chain was located. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Feb 01, 2009 2:02 am Post subject: |
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W-Wing (4 , Coloring (2), XY-Wing (451), then it finishes with either a W-Wing or BUG+1. |
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