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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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 Posted: Thu Feb 26, 2009 1:39 am Post subject: Feb. 26 VH |
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Hmmm, I'm earlier than "Early Earl." 
| 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
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| Posted: Thu Feb 26, 2009 2:57 am Post subject: Feb 26 VH |
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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
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| Posted: Thu Feb 26, 2009 3:34 am Post subject: |
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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 |
+------------+------------+-------+
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Play this puzzle online at the Daily Sudoku site |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Thu Feb 26, 2009 1:28 pm Post subject: |
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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
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| Posted: Thu Feb 26, 2009 2:52 pm Post subject: |
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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
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| Posted: Fri Feb 27, 2009 8:07 am Post subject: |
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And from a chain-ganger:
18-85-51-19-91 |
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