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Feb. 26 VH

 
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Marty R.



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

PostPosted: Thu Feb 26, 2009 1:39 am    Post subject: Feb. 26 VH Reply with quote

Hmmm, I'm earlier than "Early Earl." Laughing

Quote:
A Type 4 UR on 36 left a BUG+1 or an XY-Wing on 561. There may have been other moves too.
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Earl



Joined: 30 May 2007
Posts: 677
Location: Victoria, KS

PostPosted: Thu Feb 26, 2009 2:57 am    Post subject: Feb 26 VH Reply with quote

An xyz-wing (136) solves it in one step. Look out for the apparent UR (13) which is invalid. The UR (36) demands that R7C6 be <8>, which also solves the puzzle in one step. Coloring in <1> is also a single stepper.

Earl
Late, but not lost.


Last edited by Earl on Thu Feb 26, 2009 2:50 pm; edited 1 time in total
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crunched



Joined: 05 Feb 2008
Posts: 168

PostPosted: Thu Feb 26, 2009 3:34 am    Post subject: Reply with quote

I had to have an xy wing of 1-3-9;
Then an x-wing of 3s in columns 3,6;
Then an xy wing of 1-3-6
I see the 1-3-6 xyz wing now, but did not see it when I worked the puzzle.

Code:

+------------+------------+-------+
| 2   6   13 | 5   7  13  | 4 8 9 |
| 35  359 4  | 39  28 28  | 6 1 7 |
| 7   19  8  | 19  4  6   | 5 3 2 |
+------------+------------+-------+
| 1   7   5  | 8   3  9   | 2 6 4 |
| 4   39  39 | 2   6  5   | 8 7 1 |
| 8   2   6  | 4   1  7   | 9 5 3 |
+------------+------------+-------+
| 9   15  2  | 7   58 18  | 3 4 6 |
| 36  8   7  | 36  9  4   | 1 2 5 |
| 356 4   13 | 136 25 123 | 7 9 8 |
+------------+------------+-------+

Play this puzzle online at the Daily Sudoku site
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cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada

PostPosted: Thu Feb 26, 2009 1:28 pm    Post subject: Reply with quote

It's all about numero uno.

You can ER it using C2, Box2 to remove <1> in R7C6 or R1, Box8 to remove R9C3.

You can also Skyscraper it to remove <1> in R1C6 or R9C4.
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tlanglet



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

PostPosted: Thu Feb 26, 2009 2:52 pm    Post subject: Reply with quote

Simple coloring on <1> reduces it to singles all the way ......

Ted

Edit: I did not see your comment Earl.
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DennyOR



Joined: 12 Sep 2007
Posts: 33
Location: Portland, Oregon

PostPosted: Fri Feb 27, 2009 8:07 am    Post subject: Reply with quote

And from a chain-ganger:

18-85-51-19-91
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