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Marty R.
Joined: 12 Feb 2006 Posts: 5770 Location: Rochester, NY, USA
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Posted: Wed Mar 02, 2016 3:12 am Post subject: March 2 VH |
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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 |
+-----------+--------+------------+
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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: 28 Location: Connecticut USA
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Posted: Wed Mar 02, 2016 7:03 am Post subject: |
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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
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Posted: Wed Mar 02, 2016 10:53 am Post subject: |
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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: 28 Location: Connecticut USA
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Posted: Wed Mar 02, 2016 2:38 pm Post subject: |
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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. |
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Marty R.
Joined: 12 Feb 2006 Posts: 5770 Location: Rochester, NY, USA
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Posted: Wed Mar 02, 2016 2:55 pm Post subject: |
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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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