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Nov 25 VH

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Clement

Joined: 24 Apr 2006
Posts: 1110
Location: Dar es Salaam Tanzania

Posted: Thu Nov 24, 2016 9:57 pm Post subject: Nov 25 VH

Code:

+---------+------------+---------+
| 9 3 18 | 46 678-4 78 | 16 2 5 |
| 4 2 18 | 5 68* 9 | 3 7 16 |
| 7 6 5 | 2 3 1 | 8 9 4 |
+---------+------------+---------+
| 5 9 3 | 8 2 6 | 4 1 7 |
| 6 4 7 | 1 5 3 | 2 8 9 |
| 8 1 2 | 7 9 4 | 5 6 3 |
+---------+------------+---------+
| 2 5 4 | 9 1 78 | 67 3 68 |
| 13 8 9 | 36 67 5 | 17 4 2 |
| 13 7 6 | 3-4 48 2 | 9 5 18 |
+---------+------------+---------+

XY-Wing 68-4 pivoted in r2c5; r1c5, r9c4 <> 4; stte

hughwill

Joined: 05 Apr 2010
Posts: 422
Location: Birmingham UK

Posted: Fri Nov 25, 2016 3:24 pm Post subject: Nov 25 VH

Code:

+---------+------------+----------+
| 9 3 18 | 46 4678 78 | 16 2 5 |
| 4 2 18 | 5 68 9 | 3 7 16 |
| 7 6 5 | 2 3 1 | 8 9 4 |
+---------+------------+----------+
| 5 9 3 | 8 2 6 | 4 1 7 |
| 6 4 7 | 1 5 3 | 2 8 9 |
| 8 1 2 | 7 9 4 | 5 6 3 |
+---------+------------+----------+
| 2 5 4 | 9 1 78 | 67 3 68 |
| 13 8 9 | 36 67 5 | 17 4 2 |
| 13 7 6 | 34 48 2 | 9 45 18 |
+---------+------------+----------+

Play this puzzle online at the Daily Sudoku site
The 67-8 XY-wing pivot r8c5 is also a one-stepper after r1c6=7
Hugh

Stanley P

Joined: 27 Feb 2008
Posts: 20
Location: Tennessee, USA

Posted: Fri Nov 25, 2016 6:01 pm Post subject: Nov 25 VH

Also an XY-Wing 16-8 pivot in R2C9 that does it.

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