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Puzzle 11/04/11: A Moderate (BBDB?)

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Tue Apr 12, 2011 12:22 am    Post subject: Puzzle 11/04/11: A Moderate (BBDB?) Reply with quote
Code:
 +-----------------------+
 | 1 . . | . . . | . 8 . |
 | . 7 . | 8 3 . | 9 1 . |
 | . . 2 | 1 4 . | . . . |
 |-------+-------+-------|
 | . 1 4 | . 9 3 | 5 . 8 |
 | . 8 5 | 7 . . | . 9 . |
 | . . . | 4 . . | . . . |
 |-------+-------+-------|
 | . 9 . | 5 . . | 2 . . |
 | 5 4 . | . 2 . | . 6 . |
 | . . . | 9 . . | . . 1 |
 +-----------------------+

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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Tue Apr 12, 2011 4:55 am    Post subject: Reply with quote
Too embarrassing to get into details, but I needed nine moves to crack this one. I know it wasn't that hard, but I obviously missed something (or many things). Embarassed Embarassed
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Tue Apr 12, 2011 12:44 pm    Post subject: Reply with quote
A collection of wings..
Quote:
s-wing(26) (6)r4c4=r4c1 - (6=2)r6c2 - (2)r5c1=r5c6 ; r4c4<>2, r5c6<>6
w-wing(37) (3=7)r3c8 - r4c8=r4c1 - (7=3)r6c3 ; r6c8<>3
kite(3) r5, c9 ; r7c1<>3
xy-wing(27-6) r4c1 ; r9c2<>6, r5c1<>6
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Tue Apr 12, 2011 1:12 pm    Post subject: Reply with quote
Marty R. wrote:
... I needed nine moves to crack this one. ...

Marty,

My solver included 2x XYZ-Wing in its solution. Both of which seemed necessary for a smooth solution! If you missed them, and that would be easy, then it would make the puzzle considerably harder.

Regards, Danny

General Note: XYZ-Wings often appear to be extraneous because I notice response solutions to many puzzles where they're not used even though my solver did use them.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Tue Apr 12, 2011 3:49 pm    Post subject: Reply with quote
I did go back and try it again and used four moves, but I don't know how to solve efficiently on the first try. The four moves were XYZ-Wing, Finned X-Wing, M-Wing and XY-Wing.
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