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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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 Posted: Sat Aug 18, 2007 11:54 am Post subject: DB Saturday Puzzle: August 18, 2007 |
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| Code: | Puzzle: DB081807 ******
+-------+-------+-------+
| . . 3 | 4 . . | . 6 . |
| . . . | . 8 . | . . 7 |
| 2 5 . | . . 3 | . 4 . |
+-------+-------+-------+
| 8 . 6 | . . . | . . 4 |
| . 3 . | 2 . 4 | . 8 . |
| 4 . . | . . . | 3 . 9 |
+-------+-------+-------+
| . 7 . | 3 . . | . 1 2 |
| 6 . . | . 5 . | . . . |
| . 9 . | . . 1 | 6 . . |
+-------+-------+-------+ |
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TKiel
Joined: 22 Feb 2006
Posts: 292
Location: Kalamazoo, MI
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| Posted: Sat Aug 18, 2007 1:27 pm Post subject: |
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| Nice puzzle to practice looking for XY-wings and W-wings; of course your eyes may go crossed before you find something that helps. |
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Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
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| Posted: Sat Aug 18, 2007 2:18 pm Post subject: DB Aug 18 |
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I had to use a four step xy-chain from R4C4 to R3C7 to eliminate the 9 from R3C4, which opened the puzzle.
Anyone find a cleaner way?
Earl |
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Steve R
Joined: 24 Oct 2005
Posts: 289
Location: Birmingham, England
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| Posted: Sat Aug 18, 2007 3:03 pm Post subject: |
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A single w-wing will do, I think
Steve |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Aug 18, 2007 4:39 pm Post subject: |
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I couldn't find any XY-Wings or W-Wings. But one XY-Chain (or maybe it wasn't an XY-Chain) did the trick.
The definition of an XY-Chain is that it's a chain of bivalue cells. My chain had one trivalue cell. Do you folks adhere strictly to the definition? If so, what would you call my solution?
| Quote: | | Anyone find a cleaner way? |
Tough one to answer Earl, without knowing your standards of cleanliness.  |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sat Aug 18, 2007 6:13 pm Post subject: |
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Basic moves get you to here:
| Code: | +-------------+-------------+-------------+
| 179 8 3 | 4 2 79 | 59 6 15 |
| 19 6 4 | 159 8 59 | 2 3 7 |
| 2 5 79 | 169 167 3 | 89 4 18 |
+-------------+-------------+-------------+
| 8 12 6 | 159 3 579 | 157 257 4 |
| 79 3 579 | 2 17 4 | 157 8 6 |
| 4 12 57 | 156 167 8 | 3 257 9 |
+-------------+-------------+-------------+
| 5 7 8 | 3 9 6 | 4 1 2 |
| 6 4 1 | 78 5 2 | 78 9 3 |
| 3 9 2 | 78 4 1 | 6 57 58 |
+-------------+-------------+-------------+ |
There is a skyscraper on <7> in C16 which solves R5C5 as <1>. You can then proceed with an X-wing and two XY-wings.
Or, there is a W-wing <79> in B12 with the strong link on <9> in C7. It takes out <7> in R1C1 and R3C5 and solves the puzzle.
Keith |
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Hasel
Joined: 23 Aug 2007
Posts: 4
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| Posted: Fri Aug 24, 2007 12:38 pm Post subject: |
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I am confused...........
Hasel |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Fri Aug 24, 2007 3:52 pm Post subject: |
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| Hasel wrote: | | I am confused........... |
Over what in particular?  |
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TKiel
Joined: 22 Feb 2006
Posts: 292
Location: Kalamazoo, MI
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| Posted: Fri Aug 24, 2007 3:58 pm Post subject: |
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| That no one is visiting his site? |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Fri Aug 24, 2007 4:05 pm Post subject: |
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| Exactly Tracy ! |
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Myth Jellies
Joined: 27 Jun 2006
Posts: 64
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| Posted: Thu Aug 30, 2007 11:09 pm Post subject: |
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| After the skyscraper or sashimi x-wing in sevens sets r5c5 = 1 and then a few others as well, then there is also a 59 UR in r24c46 with three strong links that eliminates the 5 in r4c6 and solves the puzzle. |
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