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Puzzle 10/06/26: XY single-stepper

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Sat Jun 26, 2010 6:47 pm    Post subject: Puzzle 10/06/26: XY single-stepper Reply with quote
Code:
 +-----------------------+
 | . . 2 | . . . | 7 . 3 |
 | . 9 6 | . 7 2 | 4 . 8 |
 | 4 7 3 | . . . | . . 6 |
 |-------+-------+-------|
 | . . . | 8 . . | 3 . . |
 | . 2 . | . 9 . | 8 . . |
 | . 6 . | . . 4 | . . . |
 |-------+-------+-------|
 | 6 4 . | 2 8 . | 5 3 1 |
 | . . . | . . . | 2 . . |
 | 2 8 9 | . . . | 6 . 4 |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site

Code:
 after basics
 +-----------------------------------------------------------------------+
 |  8      15     2      |  1469   146    16     |  7      159    3      |
 |  15     9      6      |  3      7      2      |  4      15     8      |
 |  4      7      3      |  159    15     8      |  19     2      6      |
 |-----------------------+-----------------------+-----------------------|
 |  9      15     145    |  8      1256   1567   |  3      46     257    |
 |  37     2      145    |  1567   9      13567  |  8      46     57     |
 |  37     6      8      |  57     235    4      |  19     19     257    |
 |-----------------------+-----------------------+-----------------------|
 |  6      4      7      |  2      8      9      |  5      3      1      |
 |  15     3      15     |  467    46     67     |  2      8      9      |
 |  2      8      9      |  15     135    135    |  6      7      4      |
 +-----------------------------------------------------------------------+
 # 58 eliminations remain
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Sat Jun 26, 2010 9:22 pm    Post subject: Reply with quote
Not so easy to spot in the sea of bivalues!
Quote:
w-wing(57) (5=7)r5c9 - r4c9=r4c6 - (7=5)r6c4; r5c46<>5, r6c9<>5
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Sat Jun 26, 2010 10:00 pm    Post subject: Reply with quote
Given the title of this puzzle, I started by looking for advanced moves including xy-chains, DPs, and AN(PT) but could not find anything useful. I went back to VH+ steps and found the same solution as Peter.

Ted
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Sun Jun 27, 2010 12:06 am    Post subject: Reply with quote
tlanglet wrote:
I went back to VH+ steps and found the same solution as Peter.

Ted: W-Wing is in the XY steps.
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Sun Jun 27, 2010 11:53 am    Post subject: Reply with quote
daj95376 wrote:
tlanglet wrote:
I went back to VH+ steps and found the same solution as Peter.

Ted: W-Wing is in the XY steps.


Danny,

It seems I have forgotten several things while being out of the Sudoku world for a couple of weeks, plus I have always felt that w-wings were in the VH+ class.

Ted
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