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Puzzle 10/09/07: B

 
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Tue Sep 07, 2010 12:30 am    Post subject: Puzzle 10/09/07: B Reply with quote

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

Play this puzzle online at the Daily Sudoku site
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JC Van Hay



Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium

PostPosted: Tue Sep 07, 2010 5:17 am    Post subject: Reply with quote

Quote:
Finned X Wing (4)C38 : r2c1<>4
Finned X Wing (5)R34 : r1c2<>5
XY Wing (5-79), pivot at R4C2 : r23c3<>7
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK

PostPosted: Tue Sep 07, 2010 5:16 pm    Post subject: Reply with quote

Is this valid logic??
An xyz-wing(79-5) using a sort of pseudocell (57)
Code:
 *--------------------------------------------------------------------*
 | 8      579a   6      | 57     3      49     | 457    1      2      |
 | 29     1      457c   | 29     6      8      | 457    45     3      |
 | 3      27-5   457c   | 1      57     24     | 9      8      6      |
 |----------------------+----------------------+----------------------|
 | 49     59b    2      | 8      45     3      | 1      6      7      |
 | 6      3      57     | 24579  24579  1      | 245    45     8      |
 | 47     8      1      | 2457   2457   6      | 245    3      9      |
 |----------------------+----------------------+----------------------|
 | 5      6      3      | 249    249    29     | 8      7      1      |
 | 1      4      9      | 6      8      7      | 3      2      5      |
 | 27     27     8      | 3      1      5      | 6      9      4      |
 *--------------------------------------------------------------------*

(4) has to occur in one of r23c3. In either case a (57) is made in b1 making the xyz-wing pivot on r1c2 => r3c2<>5

ER(5) ; r1c2<>5 then to finish...
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Tue Sep 07, 2010 6:07 pm    Post subject: Reply with quote

I consider an XYZ-Wing to be a constrained form of Kraken Cell logic:

Code:
(5)r1c2               - (5)r3c2
(9)r1c2 - (9= 5)r4c2  - (5)r3c2
(7)r1c2 - (7=45)r23c3 - (5)r3c2

Cell r4c2 is in a "line" with r1c2, and cells r23c3 are in the same box with r1c2. It looks like an XYZ-Wing to me!
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ronk



Joined: 07 May 2006
Posts: 398

PostPosted: Tue Sep 07, 2010 6:36 pm    Post subject: Reply with quote

Four candidate values in four cells makes it a wxyz-wing IMO. Furthermore, since no single cell contains all four candidate values ... it's a "generalized" wxyz-wing.

I recommend avoiding this naming issue by calling it an ALS-xz.
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Mogulmeister



Joined: 03 May 2007
Posts: 703

PostPosted: Tue Sep 07, 2010 8:47 pm    Post subject: Reply with quote

Indeed.
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