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Nov 9 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania

PostPosted: Mon Nov 08, 2010 10:51 pm    Post subject: Nov 9 VH Reply with quote

Two steps:
XY-Wing 27 57 25 Pivoted in r1c6 removes 2 in r4c1 opens another
XY-Wing 14 16 46 Pivoted in r7c1 eliminating 4 in r4c9 solves it.
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peterj



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

PostPosted: Tue Nov 09, 2010 9:20 am    Post subject: Reply with quote

An m-wing(14) does it in one step...
Code:
 *-------------------------------------------------------------*
 | 27      3     29    | 8     4     1     | 57    6     59    |
 | 5       6     4     | 3     7     9     | 28    28    1     |
 | 8       79    1     | 6     5     2     | 4     37    39    |
 |---------------------+-------------------+-------------------|
 | (1)2(4) 12    3     | 7     6     8     | 25    9     2(4)5 |
 | 2467    79    2689  | 5     1     3     | 2678  2-478 2468  |
 | 67      5     68    | 9     2     4     | 1     378   368   |
 |---------------------+-------------------+-------------------|
 | (1)6    8     7     | 2     3     5     | 9     (14)  -46   |
 | 9       12    5     | 4     8     6     | 3     12    7     |
 | 3       4     26    | 1     9     7     | 268   5     268   |
 *-------------------------------------------------------------*
m-wing(14) (4=1)r7c8 - r7c1=(1-4)r4c1=r4c9 ; r5c8<>4, r7c9<>4
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Tue Nov 09, 2010 4:57 pm    Post subject: Reply with quote

There's both a Finned X-Wing and Skyscraper on 7 but I didn't check if either completes the puzzle. Also a short AIC removing 7 from r5c2.
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania

PostPosted: Tue Nov 09, 2010 5:52 pm    Post subject: Nov 9 VH Reply with quote

Correction in my submission above: The pivot for XY-Wing 27 57 25 is in r1c7.
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

PostPosted: Wed Nov 10, 2010 4:47 am    Post subject: Reply with quote

I found and "Almost" (or finned) xy-wing that made the same deletion as the m-wing posted by Peter.

AXY-wing 1-46 with vertex (16)r7c1, pincers (46)r5c1 & (14)r7c8 with fin (27)r5c1
If xy-wing is true then r5c8<>4
If fin is true then locked set(27)r15c1, then r6c1<>7=6, then r7c1<>6=1, then r7c8<>1=4; r5c8<>4

Ted
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