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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sun Feb 21, 2010 12:16 am Post subject: Puzzle 10/02/20 (B) |
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| Code: | +-----------------------+
| 1 . . | . 8 3 | . . . |
| . . 9 | . 2 . | . . . |
| . 2 . | . . 5 | . 3 . |
|-------+-------+-------|
| . . . | . 5 . | . . . |
| 5 3 . | 2 6 7 | . . 1 |
| 6 . 2 | . 1 . | 3 . 5 |
|-------+-------+-------|
| . . . | . . 1 | 6 . 3 |
| . . 3 | . . . | . 4 . |
| . . . | . 3 8 | 5 . . |
+-----------------------+
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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: Sun Feb 21, 2010 4:01 pm Post subject: |
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I initially missed an easy step but when I found it, it setup up a variation on a standard move that completed the puzzle.
| Quote: | skyscraper in r7c28 deletes 8 in r4c79, r5c3
Flightless xyz-wing 789in r8c1:
(7)r8c1; r9c123<>7,
(8)r8c1 - (8=7)r7c2; r9c123<>7,
(9)r8c1 - (9=7)r8c5 - r8c9 = r9c9; r9c123<>7,
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Ted |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Feb 21, 2010 11:32 pm Post subject: |
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| I don't know if any of my early moves had any effect: ER (8), Type 1 UR (49), and Hidden URs (24, 29). But then multi-coloring (8) and an XYZ-Wing (147) closed it out. |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Sun Feb 21, 2010 11:45 pm Post subject: |
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| A skyscraper 8 and xyz-wing 417 did it for me, |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Feb 22, 2010 1:07 am Post subject: |
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| arkietech wrote: | | A skyscraper 8 and xyz-wing 417 did it for me, |
Sounds like there was a skyscraper within my multi-coloring on 8 and that my early moves weren't a factor. |
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