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Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
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 Posted: Sat Feb 09, 2008 1:20 pm Post subject: Feb 9 DB |
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The Feb 9 DB opens with an x-wing (-4) followed by an xy-wing (-2).
Bingo!
Earl
| Code: |
+-------+-------+-------+
| 5 8 . | . . . | 4 . . |
| . 4 . | . . 6 | . 8 . |
| . . . | 4 . . | . 3 5 |
+-------+-------+-------+
| . . 1 | . 6 . | . . . |
| 9 . . | 1 . 8 | . . 2 |
| . . . | . 3 . | 1 . . |
+-------+-------+-------+
| 1 3 . | . . 9 | . . . |
| . 6 . | 3 . . | . 2 . |
| . . 7 | . . . | . 4 3 |
+-------+-------+-------+
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Play this puzzle online at the Daily Sudoku site |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Feb 09, 2008 5:56 pm Post subject: |
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| I search for X-Wings only as a last resort. An XY-Wing, perhaps the same as yours, since the pincers were 2, plus a couple of ERs did the trick. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sat Feb 09, 2008 8:30 pm Post subject: |
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All this really needs is an XY-wing (and there is more than one) to make an elimination in B1 or B2.
There is a Unique Rectangle <68> that is not needed.
(I did make an X-wing elimination when solving with pencil and paper, but I take the moves as they come, not when I am certain I have exhausted all the "basic" moves.)
Here is the crunch point:
| Code: | +----------------+----------------+----------------+
| 5 8 26 | 27 9 3 | 4 1 67 |
| 37 4 23 | 5 1 6 | 27 8 9 |
| 67 1 9 | 4 8 27 | 267 3 5 |
+----------------+----------------+----------------+
| 34 257 1 | 279 6 257 | 3578 579 478 |
| 9 57 36 | 1 4 8 | 3567 567 2 |
| 46 257 8 | 279 3 257 | 1 5679 467 |
+----------------+----------------+----------------+
| 1 3 4 | 68 2 9 | 5678 567 678 |
| 8 6 5 | 3 7 4 | 9 2 1 |
| 2 9 7 | 68 5 1 | 68 4 3 |
+----------------+----------------+----------------+ |
I count three XY-wings.
Keith |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Feb 10, 2008 1:13 am Post subject: |
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| Quote: | | I count three XY-wings. |
Plus a W on 27 in boxes 23. |
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