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Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
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 Posted: Mon Aug 09, 2010 2:10 am Post subject: Aug 9 VH |
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Did not see a single shot.
A Solution: two x-wings 4,9
Early Earl |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Aug 09, 2010 3:41 am Post subject: |
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| I didn't notice a one-step either. After an X-Wing on 4, there's an XY-Wing on 798 with the 4 having been removed from the pivot cell (r9c7). |
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kuskey
Joined: 10 Dec 2008
Posts: 141
Location: Pembroke, NH
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| Posted: Mon Aug 09, 2010 4:20 am Post subject: Aug 9 VH |
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| I took the xy-wing scenic route only because x-wings are usually the last basic technique I pull out of my kit - hate the scan. Quite interesting results. A 459 wing with pivot inr3c5, then came two 249 wings having the identical pivot in r7c5, and lastly a 479 wing with pivot in r9c7 caved it in. |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Mon Aug 09, 2010 2:00 pm Post subject: |
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| Quote: | | I took the xy-wing scenic route |
I avoided the xy-wing route - too hard to find. I used an ER on 4 and an x-wing on 9. Scenic is in the eye of the beholder! |
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Julian
Joined: 28 Jul 2010
Posts: 9
Location: Menlo, GA
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| Posted: Mon Aug 09, 2010 9:13 pm Post subject: ER |
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| I'm pretty much a newbie but am beginning to see the X-Y wings with the forums help. What is an ER, please? |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Aug 09, 2010 9:31 pm Post subject: Re: ER |
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| Julian wrote: | | I'm pretty much a newbie but am beginning to see the X-Y wings with the forums help. What is an ER, please? |
Hi Julian it's an Empty Rectangle. A search ought to provide a better explanation than I can. |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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RobertRattley
Joined: 24 Jun 2007
Posts: 118
Location: Australia
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| Posted: Fri Aug 13, 2010 10:54 am Post subject: Re: Aug 9 VH |
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I also enjoyed the "xy-wing scenic route".
(kuskey, your post implies 4 are necessary. But of the "two 249 wings" I found that, though one of them was necessary, the other didn't pinch anything. That is to say, 3 xy-wings.) |
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kuskey
Joined: 10 Dec 2008
Posts: 141
Location: Pembroke, NH
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| Posted: Fri Aug 13, 2010 6:35 pm Post subject: |
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RobertRattley wrote:
| Quote: | | (kuskey, your post implies 4 are necessary. But of the "two 249 wings" I found that, though one of them was necessary, the other didn't pinch anything. That is to say, 3 xy-wings.) |
I resolved and obtained the same result - even uncovered a couple of unproductive xy-wings. I may have missed something in the cleanup between xy-wings, making the second one unproductive. One of the things that makes Sudoku so interesting is that there are often multiple paths to the ultimate solution. |
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