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Puzzle 10/02/07 (B)

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854

PostPosted: Sun Feb 07, 2010 5:58 pm    Post subject: Puzzle 10/02/07 (B) Reply with quote

XYZ-Wing alert. Only one needed ... but not a single stepper.

Code:
 +-----------------------+
 | . . . | . . 7 | . . . |
 | . 3 . | 2 1 5 | . . 4 |
 | . . 5 | 3 . . | . 2 . |
 |-------+-------+-------|
 | . 5 6 | . . 1 | 7 . 2 |
 | . 7 . | . 2 . | 8 . . |
 | 9 4 . | 5 . . | . . . |
 |-------+-------+-------|
 | . . . | 7 6 . | 2 . 5 |
 | . . 7 | . . . | . 1 . |
 | . 6 . | 1 . . | 3 . 8 |
 +-----------------------+

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: Sun Feb 07, 2010 8:31 pm    Post subject: Reply with quote

With the clue, I only needed two steps.

Quote:
xyz-wing 459 with hinge in r9c5 deletes 9 in r9c6, and opens up a
finned x-wing 9 in r19c35 deletes 9 from r2c3.

Ted
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Mon Feb 08, 2010 5:42 am    Post subject: Reply with quote

I needed more. I played the XYZ-Wing (459) and XY-Wing (492). I then looked at the potential DP (89) in boxes 12 and determined that breaking it up with one of the 4s in c5 was invalid and that finished it off.
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