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RobertRattley
Joined: 24 Jun 2007
Posts: 118
Location: Australia
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 Posted: Tue May 10, 2016 8:23 pm Post subject: May 11 VH |
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| 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: 422
Location: Birmingham UK
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| Posted: Wed May 11, 2016 10:55 am Post subject: |
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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 |
+-------------+----------+-----------+
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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
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| Posted: Wed May 11, 2016 3:11 pm Post subject: |
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[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
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| Posted: Wed May 11, 2016 3:14 pm Post subject: |
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(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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