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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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 Posted: Mon Sep 13, 2010 3:47 am Post subject: XY-Wing limitation |
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This topic was initiated by Doyle. W. Rausch. I accidentally deleted it while moving it to this sub-forum. Sorry Doyle.
Following is what Doyle wrote:
It seems that a unique XY-Wing solution is not obtained if the 3 XY-wing pairs are in a single line (row or column). What misunderstanding of XY-Wing criteria is involved? Or is this correct? |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Mon Sep 13, 2010 3:59 am Post subject: Re: XY-Wing limitation |
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| Marty R. wrote: | This topic was initiated by Doyle. W. Rausch. I accidentally deleted it while moving it to this sub-forum. Sorry Doyle.
Following is what Doyle wrote:
It seems that a unique XY-Wing solution is not obtained if the 3 XY-wing pairs are in a single line (row or column). What misunderstanding of XY-Wing criteria is involved? Or is this correct?
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If you have ZX+XY+YZ in three cells in the same row/column/box, then it's a Naked Triple and any eliminations should have been performed prior to reaching the XY-Wing technique.
Yes, it's still a Naked Triple if you have ZX+XZY+YZ in three cells of the same house/unit. So the same holds true for an XYZ-Wing. |
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