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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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 Posted: Sat Aug 26, 2006 1:18 pm Post subject: DB Saturday Puzzle - August 26, 2006 |
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I have not yet looked at this one ...
Keith
| Code: | Puzzle: DB082606 ******
+-------+-------+-------+
| . 6 8 | . . . | 1 9 . |
| 2 . . | . . 3 | . . 5 |
| . . . | . 9 . | . 2 . |
+-------+-------+-------+
| . . 5 | 8 4 . | 9 . 7 |
| . . . | 7 . 5 | . . . |
| 1 . 3 | . 6 9 | 5 . . |
+-------+-------+-------+
| . 3 . | . 1 . | . . . |
| 7 . . | 9 . . | . . 1 |
| . 1 2 | . . . | 4 5 . |
+-------+-------+-------+ |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Aug 26, 2006 4:01 pm Post subject: |
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| This one moved along pretty quickly. After the basic stuff, a Type 1 rectangle opened up the rest of the puzzle. There may have been some X-Wings, XY-Wings and other stuff, but I didn't reach a point where it was necessary to look for them. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sat Aug 26, 2006 4:15 pm Post subject: Two UR's |
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You get here:
| Code: | +----------------+----------------+----------------+
| 34 6 8 | 5 2 7 | 1 9 34 |
| 2 9 17 | 146 8 3 | 67 467 5 |
| 34 5 17 | 146 9 46 | 678 2 3468 |
+----------------+----------------+----------------+
| 6 2 5 | 8 4 1 | 9 3 7 |
| 89 48 49 | 7 3 5 | 26 1 26 |
| 1 7 3 | 2 6 9 | 5 48 48 |
+----------------+----------------+----------------+
| 5 3 69 | 46 1 468 | 2678 678 2689 |
| 7 48 46 | 9 5 2 | 3 68 1 |
| 89 1 2 | 3 7 68 | 4 5 689 |
+----------------+----------------+----------------+ |
Ther are two Unique Rectangles: A Type 1 in R13C19, and a Type 4 in R57C79. The first one solves the puzzle.
Otherwise, there is an XY-wing on <689> rooted in R9C1. It also solves the puzzle.
Keith |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Aug 26, 2006 9:12 pm Post subject: |
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| I used that Type 1 on 34 to solve the puzzle. Have no idea if I would have spotted the 689 XY-Wing. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sat Aug 26, 2006 10:43 pm Post subject: Me neither |
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Marty,
While solving the puzzle by hand, I found the first <34> UR pretty early. The rest was easy.
I used my software to find the other UR and the XY-wing. I always like to look at the question: If you do not use a UR, how else would you solve it?
Keith |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Aug 27, 2006 3:39 am Post subject: Re: Me neither |
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| keith wrote: | Marty,
While solving the puzzle by hand, I found the first <34> UR pretty early. The rest was easy.
I used my software to find the other UR and the XY-wing. I always like to look at the question: If you do not use a UR, how else would you solve it?
Keith |
I'm strictly a paper-and-pencil guy and usually don't look for alternate solutions. I've always taken the path of least resistance to the solution; if I see something, I use it. The one thing that's changed is that I am trying to reduce my dependence on chains, so I don't go to them as quickly as I used to. |
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