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Puzzle 10/05/28: (B)

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Fri May 28, 2010 4:13 pm    Post subject: Puzzle 10/05/28: (B) Reply with quote
Code:
 +-----------------------+
 | . 4 . | . 8 . | . . . |
 | 8 9 . | . 2 . | . 4 1 |
 | . . 2 | . . . | . . . |
 |-------+-------+-------|
 | . . . | . 7 . | 4 . . |
 | 4 1 . | 9 3 5 | . 8 . |
 | . . . | . 4 . | . 5 . |
 |-------+-------+-------|
 | . . . | 7 . . | . . 8 |
 | . 5 . | . 1 9 | . 3 4 |
 | . 8 . | . . . | 1 7 5 |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Sat May 29, 2010 3:04 am    Post subject: Reply with quote
A variety of steps; I used two...............


Quote:
Extended pincer of potential xy-wing 2-79: (7=2)r5c7 - r5c9 = r1c9 - r1c8 = r7c8 - (2=6)r8c7 - (6=7)r8c3; r5c3<>7
Conflicting chain: (1)r3c1 - (1=3)r7c1 - (3=4)r7c6 - (4=1)r3c6; r3c1<>1

Ted
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Sat May 29, 2010 6:27 am    Post subject: Reply with quote
A different two...
Quote:
w-wing(27) (2=7)r5c7-r5c3=r8c3-(7=2)r8c1; r8c7<>2
xy-wing(1-34) r7c6; r3c1<>1
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Sat May 29, 2010 2:12 pm    Post subject: Reply with quote
Two XY-wings: 26-7 and -134.

Keith
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sun May 30, 2010 12:59 am    Post subject: Reply with quote
Three steps:

1) XY-Wing (267)
2) Overlapping Type 1 URs (27, 29), r1c7=5
3) Short XY-Chain
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