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An old Nightmare

 
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Sat May 24, 2008 8:32 pm    Post subject: An old Nightmare Reply with quote

Things are too quiet!

I was looking in the archives, and found this one from a couple of years ago. Enjoy!
Code:
. 1 . . . . . 7 4
. 5 . . 8 . 3 . .
2 . . . . 9 . . .
. . 6 5 . . . . .
7 4 . . 1 . . 3 8
. . . . . 4 1 . .
. . . 2 . . . . 3
. . 4 . 7 . . 8 .
6 3 . . . . . 9 .


Keith
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Sat May 24, 2008 10:27 pm    Post subject: Reply with quote

W-Wing

Simple coloring (not sure if needed)

W-Wing which couldn't make a direct elimination, but coloring one pincer twice broke it open.
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Asellus



Joined: 05 Jun 2007
Posts: 865
Location: Sonoma County, CA, USA

PostPosted: Sat May 24, 2008 11:21 pm    Post subject: Reply with quote

For me:

[1] Skyscraper on <9> in c24
[2] Kite, pivot b5, removes <6> from r1c7
[3] "Useless" XYZ Wing in r2c89|r4c9: r1c7 sees <2>s in r2c89 directly and sees <2> in r4c9 via ERs in boxes 2, 5, 4, 7 and 9. (Or, you can consider r4c9 transported to r8c7.)
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Sun May 25, 2008 1:11 am    Post subject: Reply with quote

The "basics" in this one are pretty tough.

I believe you can solve it with only a W-wing and an X-wing.

But, there are many ways through this maze. As I recall, I originally did it with a W-, XY, and W- wing.

Keith
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Sun May 25, 2008 3:49 am    Post subject: Reply with quote

Quote:
The "basics" in this one are pretty tough.

It seems that during the initial scan of rows and columns, not much got eliminated. But the scan of boxes revealed a 269 triple in box 5, and that's what got things going.
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

PostPosted: Sun May 25, 2008 3:34 pm    Post subject: Reply with quote

I solved the puzzle without using any w-wings but it took six steps: two colorings, a finned x, a swordfish and two xy-wings. Fun but long.

Ted
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