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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Fri Jan 23, 2009 2:02 am Post subject: Set NNP Puzzle 45 |
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| Code: | +-----------------------+
| 1 . . | . . . | . . . |
| . . 4 | . 2 . | 1 5 6 |
| . 6 9 | . . . | . . . |
|-------+-------+-------|
| . . . | . 3 . | . 1 . |
| . 3 . | 2 7 4 | 6 8 . |
| . . . | . 1 8 | 3 . . |
|-------+-------+-------|
| . 9 . | . 5 2 | . . 7 |
| . 1 . | 7 4 . | . 6 . |
| . 7 . | . . . | 4 . . |
+-----------------------+
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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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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Fri Jan 23, 2009 7:02 pm Post subject: |
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| Code: | .------------------------.------------------------.------------------------.
| 1 25 2357 | 345 6 57 | 279 479 8 |
| 37 8 4 | 39 2 79 | 1 5 6 |
| 257 6 9 | 45 8 1 | 27 47 3 |
:------------------------+------------------------+------------------------:
| 256789 245 2578 | 569 3 59 | 579 1 24 |
| 59 3 1 | 2 7 4 | 6 8 59 |
| 25679 245 257 | 569 1 8 | 3 79 24 |
:------------------------+------------------------+------------------------:
| 4 9 6 | 1 5 2 | 8 3 7 |
| 28 1 28 | 7 4 3 | 59 6 59 |
| 35 7 35 | 8 9 6 | 4 2 1 |
'------------------------'------------------------'------------------------' |
UR {2,4}
xy-wing |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Jan 25, 2009 4:15 pm Post subject: |
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| I used an assortment of moves including XY-Wings, W-Wing and ER before finishing off with a Type 2 UR on 24. However, I think the UR was there all along so some of my previous moves were probably not necessary. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sun Jan 25, 2009 5:45 pm Post subject: |
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The UR alone does not solve it.
The most effective way to look at the UR is that <5> in C2 must be in B4. That solves R1C2 and R5C1.
The XY-wing 45-7 is in R13.
Keith |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sun Jan 25, 2009 10:03 pm Post subject: |
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I used the Type 2 UR 24 plus a w-wing with what I believe is termed a "grouped link". The w-wing is shown in the following code which results after taking the eliminations due to the Type 2 UR24.
| Code: |
*--------------------------------------------------------------------*
| 1 2 357 | 345 6 W57 | 79 479 8 |
| 37 8 4 | 39 2 79 | 1 5 6 |
| W57 6 9 | 45 8 1 | 2 47 3 |
|----------------------+----------------------+----------------------|
| 26789 45 278 | 569 3 59 | 579 1 24 |
| 59 3 1 | 2 7 4 | 6 8 59 |
| 2679 45 27 | 569 1 8 | 3 79 24 |
|----------------------+----------------------+----------------------|
| 4 9 6 | 1 5 2 | 8 3 7 |
| 28 1 28 | 7 4 3 | 59 6 59 |
| 35 7 35 | 8 9 6 | 4 2 1 |
*--------------------------------------------------------------------* |
The w-wing57 is in r1c6 & r3c1(marked with a W) and the "grouped link on <7>" is in box3. A <7> will be placed in either r1 or r3 within box3 thereby forcing one of the w-wing pincers to be a <5>, which deletes <5> from r1c3 to complete the puzzle.
Is this form of a strong link termed a "grouped link"?
Ted |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sun Jan 25, 2009 10:57 pm Post subject: |
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Ted,
Your elimination certainly is correct. The W-wing logic is, in this case, <7> in either W-cell forces <5> in the other. I think "grouped link" is an adequately descriptive name. (I would know what to look for.)
By the way, you have missed that the UR (also) takes out <5> in R5C1.
Keith |
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