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DB Saturday Puzzle: May 19, 2007

 
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keith



Joined: 19 Sep 2005
Posts: 3165
Location: near Detroit, Michigan, USA

PostPosted: Sat May 19, 2007 11:48 am    Post subject: DB Saturday Puzzle: May 19, 2007 Reply with quote

Code:
Puzzle: DB051907  ******
+-------+-------+-------+
| . . . | . . 8 | 1 . 5 |
| . . . | . 2 9 | 6 7 . |
| . . . | . . 1 | 3 8 . |
+-------+-------+-------+
| 8 . . | . . 6 | . 5 . |
| . 7 . | . . . | . 1 . |
| . 9 . | 4 . . | . . 6 |
+-------+-------+-------+
| . 6 3 | 9 . . | . . . |
| . 5 9 | 1 6 . | . . . |
| 2 . 8 | 7 . . | . . . |
+-------+-------+-------+
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David



Joined: 02 Jun 2006
Posts: 58
Location: Bedford, UK

PostPosted: Sat May 19, 2007 9:19 pm    Post subject: Reply with quote

well this one looks quite formidable at the start with so few clues, but simple techniques take you quite a long way and then a 'skyscraper' (strong links) on 3's breaks it open.
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Marty R.



Joined: 12 Feb 2006
Posts: 5157
Location: Rochester, NY, USA

PostPosted: Sat May 19, 2007 11:38 pm    Post subject: Reply with quote

When I reached the position where the basics took me, I finished it off with a Finned X-Wing on 3, which was available in both rows and columns.

Alternatively, there was an available Type 1 rectangle on 15 which also would have solved it.
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David



Joined: 02 Jun 2006
Posts: 58
Location: Bedford, UK

PostPosted: Sun May 20, 2007 1:35 pm    Post subject: Reply with quote

I can see your finned x wing Marty, but not the UR, perhaps I had 'destroyed' it beforehand.

Anyway, thanks for posting the puzzle Keith
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keith



Joined: 19 Sep 2005
Posts: 3165
Location: near Detroit, Michigan, USA

PostPosted: Sun May 20, 2007 3:00 pm    Post subject: Reply with quote

You run out of basic moves here:
Code:
+-------------+-------------+-------------+
| 3   2   7   | 6   4   8   | 1   9   5   |
| 15  8   15  | 3   2   9   | 6   7   4   |
| 9   4   6   | 5   7   1   | 3   8   2   |
+-------------+-------------+-------------+
| 8   3   14  | 2   19  6   | 49  5   7   |
| 6   7   24  | 8   359 35  | 24  1   39  |
| 15  9   125 | 4   13  7   | 8   23  6   |
+-------------+-------------+-------------+
| 47  6   3   | 9   8   25  | 257 24  1   |
| 47  5   9   | 1   6   23  | 27  234 8   |
| 2   1   8   | 7   35  4   | 59  6   39  |
+-------------+-------------+-------------+

There is a Unique Rectangle on <15>.

Or, an XY-wing 47-24-27.

Or, XYZ-wings 25-257-27 and 23-234-24.

Keith
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Mogulmeister



Joined: 03 May 2007
Posts: 695

PostPosted: Sun May 20, 2007 10:23 pm    Post subject: Reply with quote

.....or a nice ALS that removes the 9 at r4c7 blowing the thing apart.
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