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Fri 7 VH

 
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Clement



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

PostPosted: Thu May 06, 2010 9:49 pm    Post subject: Fri 7 VH Reply with quote

UR (35)r12c26 eliminating 35 in r2c2 solves it.
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Earl



Joined: 30 May 2007
Posts: 677
Location: Victoria, KS

PostPosted: Fri May 07, 2010 2:13 am    Post subject: Apr 7 UV Reply with quote

Other single shot solutions:

xy-wing (457)
xyz-wing (145)


Earl
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George Woods



Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK

PostPosted: Fri May 07, 2010 12:05 pm    Post subject: Is this a valid solution? Reply with quote

I wondered whether a BUG +2 is valid . i.e there are two chains each of which would put a 5 in row 2 if Bug +1 logic were to be applied to the chain. so r2c6 cannot be 5????
Can anyone enlighten me?
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keith



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

PostPosted: Fri May 07, 2010 3:08 pm    Post subject: Reply with quote

After basics:
Code:
+-------------+-------------+-------------+
| 29  35  4   | 7   19  35  | 6   12  8   |
| 7   358 6   | 2   18  35  | 145 9   45  |
| 29  58  1   | 4   89  6   | 57  27  3   |
+-------------+-------------+-------------+
| 5   6   8   | 3   2   1   | 47  47  9   |
| 4   1   9   | 5   7   8   | 3   6   2   |
| 3   7   2   | 6   4   9   | 8   5   1   |
+-------------+-------------+-------------+
| 8   4   7   | 9   36  2   | 15  13  56  |
| 6   2   3   | 1   5   4   | 9   8   7   |
| 1   9   5   | 8   36  7   | 2   34  46  |
+-------------+-------------+-------------+
Yes, I believe there is a BUG+2: One of R2C27 must be 5, eliminating 5 in R2C69.

Keith
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Marty R.



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

PostPosted: Fri May 07, 2010 3:40 pm    Post subject: Reply with quote

In addition to the UR and two XY-Wings and BUG+2, there are at least two XY-Chains which also solve in one step.
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keith



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

PostPosted: Fri May 07, 2010 4:27 pm    Post subject: Reply with quote

Marty,

I see only one XY-wing -457, but I do also see an XYZ-wing 14-5.

Keith
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Marty R.



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

PostPosted: Fri May 07, 2010 4:30 pm    Post subject: Reply with quote

keith wrote:
I see only one XY-wing -457, but I do also see an XYZ-wing 14-5.

You're correct, sorry, I got careless. Embarassed
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arjun



Joined: 28 Sep 2009
Posts: 16

PostPosted: Fri May 07, 2010 7:50 pm    Post subject: Reply with quote

I used the 358 UR... this one seemed pretty simple. It took me less than 20 seconds after basics to spot it. And I immediately spotted an XY chain
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prakash



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

PostPosted: Sat May 08, 2010 3:46 am    Post subject: Reply with quote

The UR just pops out at you. The XY wing on 457 or the XYZ wing 145 works equally well.
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