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May 11 VH

 
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RobertRattley



Joined: 24 Jun 2007
Posts: 118
Location: Australia

PostPosted: Tue May 10, 2016 8:23 pm    Post subject: May 11 VH Reply with quote

Early in the pencil marking I found an xy wing 89-4 that pinches row 7 col 8 on 4 and solves it. Maybe there are other one-step solutions.
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hughwill



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

PostPosted: Wed May 11, 2016 10:55 am    Post subject: Reply with quote

After basics:
Code:

+-------------+----------+-----------+
| 7   5   4   | 1  6   2 | 8  3  9   |
| 29  1   29  | 3  7   8 | 4  6  5   |
| 3   8   6   | 4  5   9 | 2  1  7   |
+-------------+----------+-----------+
| 8   79  239 | 5  12  6 | 17 49 34  |
| 1   6   359 | 7  89  4 | 39 58 2   |
| 249 479 259 | 89 12  3 | 17 58 6   |
+-------------+----------+-----------+
| 5   3   8   | 2  49  7 | 6  49 1   |
| 6   49  7   | 89 3   1 | 5  2  48  |
| 49  2   1   | 6  489 5 | 39 7  348 |
+-------------+----------+-----------+

Play this puzzle online at the Daily Sudoku site

Either 48-9 or 89-4 XY-wings. Couldn't see much else apart from
If r9c1<>4: r8c2=4: r8c9=8: r8c4=9: r7c5=4:: r9c5<>4 stte.
(one day I'll learn Eureka.......perhaps)
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Marty R.



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

PostPosted: Wed May 11, 2016 3:11 pm    Post subject: Reply with quote

[quote]If r9c1<>4: r8c2=4: r8c9=8: r8c4=9: r7c5=4:: r9c5<4> -4r9c5
Slightly shorter
(4=9)r9c1-r8c2=r8c4-(9=4)r7c5=> -4r9c5
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Marty R.



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

PostPosted: Wed May 11, 2016 3:14 pm    Post subject: Reply with quote

(4=9)r9c1-(9=4)r8c2-(4=8)r8c9-(8=9)r8c4-(9=4)r7c5=> -4r9c5
Slightly shorter
(4=9)r9c1-r8c2=r8c4-(9=4)r7c5=> -4r9c5
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