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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Wed Dec 24, 2008 6:42 pm Post subject: Set H Puzzle 3 |
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| Code: | +-----------------------+
| 2 . 9 | . 7 . | . 3 . |
| . . 8 | . 1 . | . 7 . |
| 5 6 . | 9 . 2 | 4 8 . |
|-------+-------+-------|
| . . 2 | 7 . . | . . . |
| 9 5 . | . 2 . | . . . |
| . . 3 | . . 8 | 2 . . |
|-------+-------+-------|
| . . 5 | . . 7 | 3 . . |
| 3 7 4 | . . . | . 2 9 |
| . . . | . . . | . 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: Wed Dec 24, 2008 8:10 pm Post subject: |
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I worked very hard and long on this one. I had to redo basics after most deletions, due to either other basic deletions or VH technique deletions. It only required me five steps as follows:
| Quote: | a Type 2 UR <56>, skyscraper <1>, xy-wing <168>, kite <6> and xy-wing <159>
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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: Thu Dec 25, 2008 1:37 am Post subject: |
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I also used five steps, a couple in common with Ted.
| Quote: | Type 4 UR (78 )
Type 2 UR (56)
XYZ-Wing (156)
Coloring (1)
XY-Wing (168) |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Thu Dec 25, 2008 7:50 am Post subject: |
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| Code: | .------------------.------------------.------------------.
| 2 1 9 | 8 7 4 | 56 3 56 |
| 4 3 8 | 56 1 56 | 9 7 2 |
| 5 6 7 | 9 3 2 | 4 8 1 |
:------------------+------------------+------------------:
| 16 8 2 | 7 4569 1569 | 156 1469 3 |
| 9 5 16 | 34 2 136 | 78 146 78 |
| 7 4 3 | 156 569 8 | 2 169 56 |
:------------------+------------------+------------------:
| 168 29 5 | 24 4689 7 | 3 16 48 |
| 3 7 4 | 156 568 156 | 168 2 9 |
| 168 29 16 | 234 4689 1369 | 1678 5 478 |
'------------------'------------------'------------------' |
w-wing grouped link... (6=1)r4c1 - (1)r4c7 = (1)r456c8 - (1=6)r7c8; r7c1 <> 6
the resulting intersection of 6's in block 9 removes 6 from r9c7...
opens up a UR infered xy-wing (again). using the 78UR in r59c79 makes this inference 78URr59c79[(4)r9c9 = (1)r9c7]...
you can make this xy-wing...
(1=8)r7c1 - (8=4)r7c9 - 78UR[(4)r9c9 = (1)r9c7]; r9c13 <> 1.
singles. |
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