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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Thu Feb 17, 2011 8:22 pm Post subject: Puzzle 11/02/17 Hmmm!!! |
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| Code: | +-----------------------+
| . 8 . | . . . | 9 3 . |
| 7 1 . | 3 . . | . . 8 |
| . . 3 | 8 . . | 7 . . |
|-------+-------+-------|
| . 6 4 | 9 . 8 | 2 7 . |
| . . . | . . . | 1 . 4 |
| . . . | 7 . . | 5 8 6 |
|-------+-------+-------|
| 6 . 7 | 4 8 9 | . . . |
| 3 . . | 1 . 7 | . 5 9 |
| . 9 . | . 6 3 | . 4 . |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Fri Feb 18, 2011 8:07 am Post subject: |
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This is another good example of how a simple als strong link on a wing can make all the difference!
A wing with a simple als...
| Quote: | | w-wing-like(59) ; (9=45)r31c1 - r4c1=r4c5 - (5=9)r2c5 ; r2c3<>9, r3c5<>9 |
Or using "standard" wings (there may be a quicker path)
| Quote: | xy-wing(15-2) r4c1 ; r9c3<>2
xy-wing(56-2) r1c3 ; r5c4<>2
w-wing(56) ; (6=5)r1c3 - r5c3=r5c6 - (5=6)r2c6 ; r2c3<>6, r1c5<>6
skyscraper(5) r2, r5 |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Feb 19, 2011 12:02 am Post subject: |
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| I used two XY-Wings, two URs and an ER. |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Sat Feb 19, 2011 3:02 am Post subject: |
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| I'm glad this puzzle didn't create any problems. My solver performed a finned X-Wing first and that resulted in a UR Type 6 (minus one candidate) being encountered later. |
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