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Aug 9 VH

 
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Earl



Joined: 30 May 2007
Posts: 623
Location: Victoria, KS

PostPosted: Mon Aug 09, 2010 2:10 am    Post subject: Aug 9 VH Reply with quote

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

PostPosted: Mon Aug 09, 2010 3:41 am    Post subject: Reply with quote

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

PostPosted: Mon Aug 09, 2010 4:20 am    Post subject: Aug 9 VH Reply with quote

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

PostPosted: Mon Aug 09, 2010 2:00 pm    Post subject: Reply with quote

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

PostPosted: Mon Aug 09, 2010 9:13 pm    Post subject: ER Reply with quote

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

PostPosted: Mon Aug 09, 2010 9:31 pm    Post subject: Re: ER Reply with quote

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: 703

PostPosted: Mon Aug 09, 2010 11:37 pm    Post subject: Reply with quote

Julian, I think we might all recommend this:


http://www.sudoku.frihost.net/forum/viewtopic.php?t=943
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RobertRattley



Joined: 24 Jun 2007
Posts: 117
Location: Australia

PostPosted: Fri Aug 13, 2010 10:54 am    Post subject: Re: Aug 9 VH Reply with quote

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

PostPosted: Fri Aug 13, 2010 6:35 pm    Post subject: Reply with quote

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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