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Puzzle NR 09/12/17 (C)

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Thu Dec 17, 2009 5:07 pm    Post subject: Puzzle NR 09/12/17 (C) Reply with quote
Three puzzles today so I can close out the puzzle datafile.

Code:
 +-----------------------+
 | 3 . . | . . 9 | . 7 4 |
 | . . . | . 4 . | 2 . 5 |
 | . . 5 | . . 3 | 9 . . |
 |-------+-------+-------|
 | . . . | 9 . . | . . . |
 | . 7 . | . . . | . . . |
 | 8 . 9 | . . 6 | . 5 . |
 |-------+-------+-------|
 | . 4 3 | . . . | 8 9 . |
 | 9 . . | . . 2 | 4 . . |
 | 6 2 . | . . . | . . . |
 +-----------------------+

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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Fri Dec 18, 2009 1:18 am    Post subject: Reply with quote
Another one stepper.
Quote:
AIC formed by extending the vertex of a potential xy-wing 1-68.
(6=8)r2c3 - (8=1)r2c6 - (1=5)r7c6 - (5)r7c1 = (5)r8c2 - (5=6)r4c2; r1c2, r45c3<>6.

Ted
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sat Dec 19, 2009 5:55 am    Post subject: Reply with quote
I used two XY-Wings, an ER, then looked at the potential DP 37-38-78 in boxes 789. There were three ways to kill it, two were invalid and that finished it off.
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Sun Dec 20, 2009 2:39 pm    Post subject: Reply with quote
Code:
 r9c2    2-String Kite                   <> 8    r1c4

 <68+5>  XY-Wing  r1c2/r1c4+r8c2         <> 5    r8c4
 <68+5>  XY-Wing  r1c2/r1c5+r4c2         <> 5    r4c5   extraneous
 <18+5>  XY-Wing  r2c6/r1c5+r7c6         <> 5    r8c5
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