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Clement
Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
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 Posted: Thu May 06, 2010 9:49 pm Post subject: Fri 7 VH |
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| UR (35)r12c26 eliminating 35 in r2c2 solves it. |
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Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
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| Posted: Fri May 07, 2010 2:13 am Post subject: Apr 7 UV |
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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
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| Posted: Fri May 07, 2010 12:05 pm Post subject: Is this a valid solution? |
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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
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| Posted: Fri May 07, 2010 3:08 pm Post subject: |
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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
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| Posted: Fri May 07, 2010 3:40 pm Post subject: |
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| 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
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| Posted: Fri May 07, 2010 4:27 pm Post subject: |
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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
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| Posted: Fri May 07, 2010 4:30 pm Post subject: |
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| 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.  |
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arjun
Joined: 28 Sep 2009
Posts: 16
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| Posted: Fri May 07, 2010 7:50 pm Post subject: |
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| 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
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| Posted: Sat May 08, 2010 3:46 am Post subject: |
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| The UR just pops out at you. The XY wing on 457 or the XYZ wing 145 works equally well. |
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