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Feb 25 VH

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Clement

Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania

Posted: Mon Feb 24, 2014 10:13 pm Post subject: Feb 25 VH

Code:

+-----------+------------+-----------+
| 129 3 19 | *24 6 5 | 7 8 49 |
| 68 68 4 | 9 3 7 | 2 1 5 |
| 29 7 5 | 8 124 1-4 | 3 46 469 |
+-----------+------------+-----------+
| 4 2 8 | 1 9 6 | 5 7 3 |
| 7 1 36 | #23 5 8 | 4 9 26 |
| 5 9 36 | 7 24 *34 | 1 26 8 |
+-----------+------------+-----------+
| 3 48 7 | 6 148 2 | 9 5 14 |
| 18 5 2 | 34 18 9 | 6 34 7 |
| 169 46 19 | 5 7 134 | 8 234 124 |
+-----------+------------+-----------+

XY-Wing 23-4 pivoted in r5c4; r3c6<>4 opens another
XY-Wing 46-2 pivoted in r3c8; r6c5<>2; stte.

hughwill

Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK

Posted: Tue Feb 25, 2014 10:05 am Post subject: Feb 25 VH

Code:

+-----------+------------+-----------+
| 129 3 19 | 24 6 5 | 7 8 49 |
| 68 68 4 | 9 3 7 | 2 1 5 |
| 29 7 5 | 8 124 14 | 3 46 469 |
+-----------+------------+-----------+
| 4 2 8 | 1 9 6 | 5 7 3 |
| 7 1 36 | 23 5 8 | 4 9 26 |
| 5 9 36 | 7 24 34 | 1 26 8 |
+-----------+------------+-----------+
| 3 48 7 | 6 148 2 | 9 5 14 |
| 18 5 2 | 34 18 9 | 6 34 7 |
| 169 46 19 | 5 7 134 | 8 234 124 |
+-----------+------------+-----------+

Play this puzzle online at the Daily Sudoku site

Another 234 XY-Wing pivot r5c4 removes 4 from r7c5 leading to Clement's
second XY wing. A lot of red herrings in this one- I was sure there was a
one stepper somewhere.....

Marty R.

Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

Posted: Tue Feb 25, 2014 2:57 pm Post subject:

I also needed two XY-Wings.

JC Van Hay

Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium

Posted: Tue Feb 25, 2014 5:21 pm Post subject:

Code:

+-------------+----------------+---------------+
| 129 3 19 | 2(4) 6 5 | 7 8 9(4) |
| 68 68 4 | 9 3 7 | 2 1 5 |
| 29 7 5 | 8 124 14 | 3 6-4 469 |
+-------------+----------------+---------------+
| 4 2 8 | 1 9 6 | 5 7 3 |
| 7 1 36 | 23 5 8 | 4 9 26 |
| 5 9 36 | 7 24 34 | 1 26 8 |
+-------------+----------------+---------------+
| 3 48 7 | 6 148 2 | 9 5 1-4 |
| 18 5 2 | 3(4) 18 9 | 6 3(4) 7 |
| 169 46 19 | 5 7 134 | 8 234 12-4 |
+-------------+----------------+---------------+

Skyscraper(4r1c49,4r8c48)-4r3c8,r79c9; ste

Clement

Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania

Posted: Tue Feb 25, 2014 8:50 pm Post subject: Feb 25 VH

Code:

+-----------+------------+-----------+
| 129 3 19 | a24 6 5 | 7 8 9-4 |
| 68 68 4 | 9 3 7 | 2 1 5 |
| 29 7 5 | 8 124 14 | 3 f46 469 |
+-----------+------------+-----------+
| 4 2 8 | 1 9 6 | 5 7 3 |
| 7 1 36 | b23 5 8 | 4 9 26 |
| 5 9 36 | 7 d24 c34 | 1 e26 8 |
+-----------+------------+-----------+
| 3 48 7 | 6 148 2 | 9 5 14 |
| 18 5 2 | 34 18 9 | 6 34 7 |
| 169 46 19 | 5 7 134 | 8 234 124 |
+-----------+------------+-----------+

Another single stepper is
XY Chain: (4=2)r1c4-(2=3)r5c4-(3=4)r6c6-(4=2)r6c5-(2=6)r6c8-(6=4)r3c8; r1c9<>4.

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