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Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
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 Posted: Sat Dec 27, 2008 4:15 pm Post subject: Dec 27 DB |
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The December 27 DB presents a number of coloring (skyscraper) options.
One of them solves it in a single blow.
Earl
| Code: |
+-------+-------+-------+
| . . . | . . . | . . 4 |
| . . 7 | 2 8 . | . 5 3 |
| 6 . . | 5 7 . | . . 2 |
+-------+-------+-------+
| 4 . . | 1 3 . | . . . |
| . 5 . | . . . | . 2 . |
| . . . | . 2 5 | . . 1 |
+-------+-------+-------+
| 7 . . | . 5 1 | . . 8 |
| 5 1 . | . 9 7 | 4 . . |
| 3 . . | . . . | . . . |
+-------+-------+-------+
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Play this puzzle online at the Daily Sudoku site |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sat Dec 27, 2008 8:00 pm Post subject: |
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I found four or five deletions that did not seem to be very helpful; then I found a one-stepper.
| Quote: | xy-wing <689> pivot <69> at r6c4
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Ted |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sun Dec 28, 2008 3:24 am Post subject: |
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After basics: | Code: |
+----------------+----------------+----------------+
| 2 389 5 | 69 1 369 | 6789 678 4 |
| 19 49 7 | 2 8 469 | 169 5 3 |
| 6 34 189 | 5 7 34 | 189 18 2 |
+----------------+----------------+----------------+
| 4 2 69 | 1 3 689 | 5678 678 57 |
| 18 5 136 | 7 4 68 | 368 2 9 |
| 89 7 369 | 69 2 5 | 368 4 1 |
+----------------+----------------+----------------+
| 7 6 4 | 3 5 1 | 2 9 8 |
| 5 1 2 | 8 9 7 | 4 3 6 |
| 3 89 89 | 4 6 2 | 157 17 57 |
+----------------+----------------+----------------+ |
The XY-wing was how I solved it.
However, there is also a Type 3 and / or Type 4 UR on <57>.
Since we were having that discussion, I thought I'd point it out.
Keith |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Sun Dec 28, 2008 2:53 pm Post subject: |
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| There's a skyscraper on <9> from c14 that makes three eliminations. Used that and the xy wing for <689> |
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