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Puzzle 10/10/18: B XY

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Mon Oct 18, 2010 2:23 am    Post subject: Puzzle 10/10/18: B XY Reply with quote
Code:
 +-----------------------+
 | 2 . . | . . . | . 6 5 |
 | . 6 . | . . . | 7 2 . |
 | . . 7 | 2 . . | 4 . . |
 |-------+-------+-------|
 | . . 8 | 6 . . | . . . |
 | . . . | . 2 8 | . 1 . |
 | . . . | . 7 5 | 9 . 6 |
 |-------+-------+-------|
 | . 8 6 | . . 4 | 2 . . |
 | 7 4 . | . 6 . | . 3 9 |
 | 3 . . | . . 2 | . 4 7 |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Mon Oct 18, 2010 9:03 am    Post subject: Reply with quote
A UR move...
Quote:
Sort of xy-wing with UR ; (9=4)r1c3 - UR(89)r19c45:[(4)r1c45=(3)r1c4] - (3=9)r5c4 ; r5c3<>9
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Mon Oct 18, 2010 9:47 am    Post subject: Reply with quote
Peter: Nice move! This is a UR scenario that I don't have in my solver. Sad
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Mon Oct 18, 2010 9:52 pm    Post subject: Reply with quote
Take your choice, M-Wing or W-Wing on 39, using r1c2 and r5c4 for the W or r1c2 and r4c6 for the M; r1c4<>3.
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Tue Oct 19, 2010 1:24 pm    Post subject: Reply with quote
I used Marty's w-wing...........

Ted
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Tue Oct 19, 2010 1:26 pm    Post subject: Reply with quote
peterj wrote:
A UR move...
Quote:
Sort of xy-wing with UR ; (9=4)r1c3 - UR(89)r19c45:[(4)r1c45=(3)r1c4] - (3=9)r5c4 ; r5c3<>9


That is a wonderful move Peter. The UR creates a pseudocell vertex for the xy-wing.

Ted
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