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Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
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 Posted: Sat May 30, 2009 2:06 pm Post subject: May 30- DB |
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The May 30 DB put me back on the chain-gang. Anyone find a more elegant solution?
SOLUTION: xy-chain from R5C8 to R7C9 with a <7> pincer eliminates the 7 in R7C8 and solves the puzzle.
Earl
| Code: |
+-------+-------+-------+
| . . . | 7 . 4 | 1 . . |
| 1 . . | 6 9 . | . 3 . |
| . . 3 | . . . | . 9 8 |
+-------+-------+-------+
| 2 . 6 | . . 3 | . 5 . |
| . . . | . . . | . . . |
| . 7 . | 5 . . | 9 . 2 |
+-------+-------+-------+
| 4 1 . | . . . | 6 . . |
| . 5 . | . 6 9 | . . 3 |
| . . 2 | 4 . 7 | . . . |
+-------+-------+-------+
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Play this puzzle online at the Daily Sudoku site |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sat May 30, 2009 3:58 pm Post subject: |
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I found a W-wing that does not help. There are a number of 4-cell chains (extended XY-wings) that 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 May 31, 2009 1:01 am Post subject: |
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I used the unhelpful W-Wing. There was a potential 15-12-25 DP in boxes 258. Every one of the three DP killers forced the same number in r7c6 and that's all that was needed.
| Quote: | | Anyone find a more elegant solution? |
I'm a lousy judge of elegance. You make the call.  |
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