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Puzzle 10/10/31: A13 Advanced

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Sat Oct 30, 2010 5:31 pm    Post subject: Puzzle 10/10/31: A13 Advanced Reply with quote
I'm hanging up my hat on posting puzzles. Today's puzzles are the last.

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

Play this puzzle online at the Daily Sudoku site
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Tue Nov 02, 2010 5:11 pm    Post subject: Reply with quote
The UR is the only step - I think...
Quote:
type 2 UR(13) r38c23 ; r8c9<>4, r9c23<>4
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Tue Nov 02, 2010 9:45 pm    Post subject: Reply with quote
Peter, I was just going to try this again, but reading your post saved me the trouble because I had the same step and similar doubt.
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Wed Nov 03, 2010 12:41 am    Post subject: Reply with quote
My solver had three steps prior to the UR Type 2. I never thought to check to see if any of them were extraneous. Congratulations Peter and Marty on bypassing the useless steps!
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