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Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
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 Posted: Thu Nov 13, 2008 4:04 am Post subject: Nov 13 VH |
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There is an apparent UR, which by coincidence works! But the authentic one-step solution is an xyz-wing (248).
Earl |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Thu Nov 13, 2008 5:04 am Post subject: |
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| I saw the URs (first one not needed) before I started looking for wings. |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Thu Nov 13, 2008 8:09 am Post subject: |
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| There is also an ER on 2 that "one steps" it. |
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George Woods
Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK
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| Posted: Thu Nov 13, 2008 10:20 am Post subject: |
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| Marty R. wrote: | | I saw the URs (first one not needed) before I started looking for wings. |
The Ur that I used and works as a solution is based on the fact that r9c1 cannot be 9 because if it is: then a "conspiracy" of 19s in boxes 4 and 7 forces the deadly 19 pair in box1 to match the existing 19 pair in box3.
Such puzzles give me double enjoyment cos having provred the DR - Go back to the beginning and find the "authentic" solution (for me the ERin 2s in box7) |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Thu Nov 13, 2008 2:04 pm Post subject: |
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| The ER on <2> also works as a skyscraper. |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Thu Nov 13, 2008 2:22 pm Post subject: |
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Another one-step solution is a finned x-wing that removes <2> from r9c2, which then results in the same deletion as the ER and skyscraper.
Ted |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Thu Nov 13, 2008 3:41 pm Post subject: |
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I had an X-wing on <4>, then an XY-wing that solves R9C1.
Having ignored the UR's <19>, <34>, <45>, and a skyscraper on <2>.
Keith |
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