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LA Times / Freep 19 Sep 2008

 
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Fri Sep 19, 2008 10:02 pm    Post subject: LA Times / Freep 19 Sep 2008 Reply with quote
I have not yet looked at this:
Code:
Puzzle: FP091908
+-------+-------+-------+
| . . . | 1 . 9 | 4 . . |
| . . . | . 8 . | . 3 2 |
| . 2 1 | . . . | . 8 . |
+-------+-------+-------+
| 6 7 . | . . . | . . . |
| . . . | 5 9 2 | . . . |
| . . . | . . . | . 1 9 |
+-------+-------+-------+
| . 9 8 | . . . | 6 7 . |
| 3 . . | . 4 . | . . . |
| . . 5 | 6 . 3 | . . . |
+-------+-------+-------+
Keith
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Sat Sep 20, 2008 12:23 am    Post subject: Reply with quote
This seemed to be one of the easier LA Times / Freep puzzles.
Details:
Quote:
XY-wing 346 with pivot r5c3 that deletes <6> from r1c8 to complete the puzzle. A UR <25> is also a one stepper.


Ted
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sat Sep 20, 2008 12:48 am    Post subject: Reply with quote
Ted's wing was my finishing step, but I used the UR first and it didn't finish it off unless I missed something.
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Sat Sep 20, 2008 3:12 am    Post subject: Reply with quote
After filling in pencil marks for a few two-candidate cells, there was a very obvious XY-wing. No pairs, no line-box interactions ...

I did not look at the details, but Sudoku Susser says either a UR or an XY-wing will do it.

Keith

Edit: The UR does finish it off, if you then slog through the basics.
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