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Oct 31 VH

 
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prakash



Joined: 02 Jan 2008
Posts: 67
Location: New Jersey, USA

PostPosted: Sat Oct 30, 2010 8:36 pm    Post subject: Oct 31 VH Reply with quote

A single stepper using a finned X wing on 8 in r17c59 clears r7c7.
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Clement



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

PostPosted: Sat Oct 30, 2010 10:34 pm    Post subject: Oct 31 VH Reply with quote

W-Wing 38 strong link 8 in col 7 eliminating 3 in r7c9 solves it.
There is also an XY-Wing 89 39 38 removing 8 in r7c5 which does it as well.
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Marty R.



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

PostPosted: Sun Oct 31, 2010 12:27 am    Post subject: Reply with quote

I saw five moves, three of which were mentioned above. The other two are BUG+2 and Skyscraper (8).
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kuskey



Joined: 10 Dec 2008
Posts: 141
Location: Pembroke, NH

PostPosted: Sun Oct 31, 2010 1:43 am    Post subject: 31 Oct VH Reply with quote

Although I haven't yet a total grasp of finned x-wings and w-wings, I do believe we can add three more moves due to variants. The 389 xy-wing can be played with the pivot at r7c7 eliminating 3 at r7c9 and r8c4. The finned x-wing on 8 can be played in columns with the fin at r8c9 eliminating 8 in r7c7. The w-wing on 38 can be played using the third 38 at r8c4 and the strong link on 3 in row 7 tp eliminate 8 in r8c9.

Marty, is the skyscraper related to the finned x-wings?
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Marty R.



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

PostPosted: Sun Oct 31, 2010 3:26 am    Post subject: Reply with quote

Quote:
Marty, is the skyscraper related to the finned x-wings?

I'm no theoretician, so as far as I'm concerned they're two separate moves, but maybe they're related in a way I'm unaware of.
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Mon Nov 01, 2010 5:35 pm    Post subject: Reply with quote

After basics:
Code:
+-------------+-------------+-------------+
| 9   6   1   | 2   48  7   | 5   34  38  |
| 3   7   4   | 68  1   5   | 89  69  2   |
| 2   5   8   | 46  9   3   | 1   46  7   |
+-------------+-------------+-------------+
| 1   8   9   | 34  34  2   | 6   7   5   |
| 7   2   5   | 9   6   8   | 3   1   4   |
| 6   4   3   | 5   7   1   | 2   8   9   |
+-------------+-------------+-------------+
| 5   19  6   | 7   38  4   | 89  2   138 |
| 4   19  2   | 38  5   6   | 7   39  138 |
| 8   3   7   | 1   2   9   | 4   5   6   |
+-------------+-------------+-------------+
There are two XY-wings: -389 or 3-89.

Keith
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