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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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 Posted: Sat May 19, 2007 11:48 am Post subject: DB Saturday Puzzle: May 19, 2007 |
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| 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
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| Posted: Sat May 19, 2007 9:19 pm Post subject: |
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| 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: 5770
Location: Rochester, NY, USA
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| Posted: Sat May 19, 2007 11:38 pm Post subject: |
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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
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| Posted: Sun May 20, 2007 1:35 pm Post subject: |
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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: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sun May 20, 2007 3:00 pm Post subject: |
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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: 1151
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| Posted: Sun May 20, 2007 10:23 pm Post subject: |
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| .....or a nice ALS that removes the 9 at r4c7 blowing the thing apart. |
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