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Set NNP_2 Puzzle 7

 
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Tue Jan 27, 2009 12:34 am    Post subject: Set NNP_2 Puzzle 7 Reply with quote

Code:
 +-----------------------+
 | . 9 . | . . . | . 4 . |
 | 6 5 3 | . 4 . | . . . |
 | . 1 7 | . 2 9 | 5 3 . |
 |-------+-------+-------|
 | . . . | . 7 . | . 6 . |
 | . 6 2 | 9 . . | 4 . . |
 | . . 4 | . . 2 | 7 . . |
 |-------+-------+-------|
 | . . 5 | . 9 8 | 6 . . |
 | 3 . 6 | 5 . . | . 9 . |
 | . . . | . . . | . . 5 |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site

===== ===== ===== ===== ===== ===== ===== ===== ===== 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

PostPosted: Tue Jan 27, 2009 5:01 am    Post subject: Reply with quote

Code:
.---------------------.---------------------.---------------------.
| 2      9      8     | 367    356    3567  | 1      4      67    |
| 6      5      3     | 178    4      17    | 289    27     2789  |
| 4      1      7     | 68     2      9     | 5      3      68    |
:---------------------+---------------------+---------------------:
| 59     8      1     | 34     7      345   | 239    6      239   |
| 7      6      2     | 9     U358    135   | 4     U58    *13    |
| 59     3      4     |*16    U568    2     | 7     U58    *19    |
:---------------------+---------------------+---------------------:
| 1      247    5     | 2347   9      8     | 6      27     2347  |
| 3      247    6     | 5      1      47    | 28     9      2478  |
| 8      247    9     | 23467  36     3467  | 23     1      5     |
'---------------------'---------------------'---------------------'

got this one
notice the UR {5,8}, creates a strong inference on the 3 in r5c5 and the 6 in r6c5...
UR58[(6)r6c5 = (3)r5c5] - (3=1)r5c9 - (1)r6c9 = (1)r6c4; r6c4 <> 6
which breaks it.
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tlanglet



Joined: 17 Oct 2007
Posts: 2461
Location: Northern California Foothills

PostPosted: Wed Jan 28, 2009 5:04 am    Post subject: Reply with quote

Very nice chain Norm!

I used the same code in a less efficient manner plus two other steps to solve the puzzle.
Quote:
ER3,
Type 2 UR58 to delete<36> from r5c1,
and a xy-wing356

Ted Smile
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Marty R.



Joined: 12 Feb 2006
Posts: 5179
Location: Rochester, NY, USA

PostPosted: Wed Jan 28, 2009 5:33 am    Post subject: Reply with quote

I don't see a Type 2. But as a Type 4 with the strong link on 8, the 5s are removed, leaving a 368 triple in c5. Or looking at it as a Type 3, since one of the cells must be = 3 or 6, that creates a naked pair 36 with r9c5.
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tlanglet



Joined: 17 Oct 2007
Posts: 2461
Location: Northern California Foothills

PostPosted: Wed Jan 28, 2009 1:03 pm    Post subject: Reply with quote

Marty R. wrote:
I don't see a Type 2. But as a Type 4 with the strong link on 8, the 5s are removed, leaving a 368 triple in c5. Or looking at it as a Type 3, since one of the cells must be = 3 or 6, that creates a naked pair 36 with r9c5.


Marty, you are correct. It was a case of "fat thumbs"; I meant to say Type 3 which deletes <36> from r1c5. Sorry for any confusion this typo may have caused.

Ted
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