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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Thu Sep 23, 2010 4:09 am Post subject: Puzzle 10/09/23: C |
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| Code: | +-----------------------+
| 8 . 4 | 5 . . | 6 . . |
| . 9 . | . 7 . | . . . |
| 2 . 7 | . . . | . . 1 |
|-------+-------+-------|
| 5 . . | 8 . 9 | . . . |
| . . 1 | . . . | 9 . . |
| . . . | 4 . 3 | 1 . . |
|-------+-------+-------|
| 9 . . | . . 7 | . 5 . |
| . . . | . . . | 4 9 . |
| 4 . 5 | . . . | . . 7 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Thu Sep 23, 2010 2:32 pm Post subject: |
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Another two stepper.............
| Quote: | x-chain 1: (1)r1c2-r78c2=r8c1-r8c6=r1c6; r1c2<>1 contradiction
(After finding this contradiction while looking for a xy-wing, I realized that coloring 1 also does the trick.)
w-wing (38) r3c7 & r8c5 SL(3)r9c57; r3c5<>8 |
Ted |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Thu Sep 23, 2010 5:55 pm Post subject: |
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Wings only - but same eliminations as Ted I assume...
| Quote: | w-wing(13) ; (3=1)r1c2 - r7c2=r7c4 - (1=3)r2c4 ; r2c13<>3, r1c5<>3
w-wing(38) ; (8=3)r3c7 - r9c7=r9c5 - (3=8)r8c5 ; r3c5<>8 |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Sep 25, 2010 1:26 am Post subject: |
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W-Wing (13) or Skyscraper (1) makes the same eliminations.
Potential DP (48 ), boxes 23; r3c6<>6 due to invalidity.
There was also an AER. If r7c7<>8, then an ER makes r9c6<>8. R7c7<>8 due to invalidity, thus the ER makes r9c6<>8.   |
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