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March 2 VH

 
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Wed Mar 02, 2016 3:12 am    Post subject: March 2 VH Reply with quote
Code:

+-----------+--------+------------+
| 156 9 56  | 4  8 7 | 12 3   126 |
| 3   7 4   | 56 2 1 | 58 9   68  |
| 16  8 2   | 56 9 3 | 7  156 4   |
+-----------+--------+------------+
| 58  6 3   | 2  1 9 | 58 4   7   |
| 2   4 58  | 7  3 6 | 19 15  189 |
| 9   1 7   | 8  4 5 | 3  26  26  |
+-----------+--------+------------+
| 4   2 19  | 3  5 8 | 6  7   19  |
| 68  3 689 | 1  7 4 | 29 28  5   |
| 7   5 18  | 9  6 2 | 4  18  3   |
+-----------+--------+------------+

Play this puzzle online at the Daily Sudoku site

Quote:
Overlapping XY-Wings, 58-1 and 15-8, pivoted in r5c3 and r5c8, respectively
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williamholiday



Joined: 01 Apr 2011
Posts: 30
Location: Connecticut USA
PostPosted: Wed Mar 02, 2016 7:03 am    Post subject: Reply with quote
I didn't see Marty's but stumbled onto a one stepper:
xyz(29-1) p:r8c7 r1c9<>1
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hughwill



Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
PostPosted: Wed Mar 02, 2016 10:53 am    Post subject: Reply with quote
williamholiday wrote:
I didn't see Marty's but stumbled onto a one stepper:
xyz(29-1) p:r8c7 r1c9<>1


Yes that's the one (29-1 xy-wing) I saw, then I noticed that the key elimination
that follows (r2c9<>6) is also produced by a 16-2 xyz-wing pivot r1c9.
(I always give thanks for these small matters of interest in the puzzles!)

Hugh
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williamholiday



Joined: 01 Apr 2011
Posts: 30
Location: Connecticut USA
PostPosted: Wed Mar 02, 2016 2:38 pm    Post subject: Reply with quote
Which is more difficult, the puzzles or the terminology? I'm going to use xyz when there 3 evaluations and xy with 2 from now on. Shocked Very Happy
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Wed Mar 02, 2016 2:55 pm    Post subject: Reply with quote
Quote:
key elimination
that follows (r2c9<>6) is also produced by a 16-2 xyz-wing pivot r1c9.


The value of "Z" is 2, the number common to all three cells. In order for there to be a direct elimination, there would have to be a 2 in either r2c9 or r3c9.

http://www.sadmansoftware.com/sudoku/xyzwing.php
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