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Puzzle 11/04/23: ~ Difficult

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Sat Apr 23, 2011 6:12 am    Post subject: Puzzle 11/04/23: ~ Difficult Reply with quote
Code:
 +-----------------------+
 | . . 3 | . 2 . | . . . |
 | . 6 . | . 5 . | . . . |
 | 1 . 7 | 3 . . | . . . |
 |-------+-------+-------|
 | . . 5 | . 6 7 | . . 9 |
 | 7 2 . | 1 4 . | . 6 . |
 | . . . | 5 . 2 | 1 . 7 |
 |-------+-------+-------|
 | . . . | . . 6 | 3 5 . |
 | . . . | . 1 . | 2 7 . |
 | . . . | 2 . 5 | . . 1 |
 +-----------------------+

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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Sat Apr 23, 2011 4:12 pm    Post subject: Reply with quote
Two steps...
Quote:
xy-chain ; (8=7)r7c5 - (7=3)r9c5 - (3=9)r6c5 - (9=3)r5c6 - (3=8)r5c9 ; r7c9<>8
xy-wing(39-8) r5c6 ; r8c3<>8
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Mon Apr 25, 2011 4:18 am    Post subject: Reply with quote
XY-Wing (398); r8c3<>8
XY-Wing Chain (89-49-49-49-48); r5c9<>8
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