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hughwill
Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
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 Posted: Tue Apr 14, 2015 8:41 am Post subject: Apr 6 2010 VH |
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(posted in error!)
After basics: | Code: |
+--------+--------------+-----------+
| 9 2 7 | 1 6 8 | 3 5 4 |
| 8 6 4 | 35 2 35 | 1 7 9 |
| 1 3 5 | 47 79 479 | 8 6 2 |
+--------+--------------+-----------+
| 5 18 3 | 67 4 17 | 9 2 68 |
| 7 18 2 | 36 19 139 | 46 48 5 |
| 6 4 9 | 25 8 25 | 7 1 3 |
+--------+--------------+-----------+
| 3 9 6 | 2478 17 1247 | 5 48 78 |
| 2 5 1 | 478 3 47 | 46 9 678 |
| 4 7 8 | 9 5 6 | 2 3 1 |
+--------+--------------+-----------+
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Play this puzzle online at the Daily Sudoku site
A solution: | Quote: | Two XY-Wings work- 179 pivot r5c5 leading
to 479 XY pivot r3c6 > r7c5=1 |
Nice to have a two-stepper unless
anyone knows better........
Hugh
Last edited by hughwill on Wed Apr 15, 2015 12:05 pm; edited 1 time in total |
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JC Van Hay
Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
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| Posted: Tue Apr 14, 2015 10:10 am Post subject: |
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Hugh : you need 2 more steps !
Investigating the solutions of the puzzle from the 2 solutions of R4 gives : r4c6=7 -> r8c6={} while r4c6=1 solves the puzzle using stte.
Interpretation :
| Code: | +----------+-----------------+-----------------+
| 9 2 7 | 1 6 8 | 3 5 4 |
| 8 6 4 | 35 2 35 | 1 7 9 |
| 1 3 5 | 47 79 479 | 8 6 2 |
+----------+-----------------+-----------------+
| 5 18 3 | (67) 4 1-7 | 9 2 8(6) |
| 7 18 2 | 36 19 139 | 46 48 5 |
| 6 4 9 | 25 8 25 | 7 1 3 |
+----------+-----------------+-----------------+
| 3 9 6 | 248-7 17 1247 | 5 48 78 |
| 2 5 1 | 48-7 3 (47) | (46) 9 78(6) |
| 4 7 8 | 9 5 6 | 2 3 1 |
+----------+-----------------+-----------------+
pseudo-WWing : (7=6)r4c4 - 6r4c9=6r8c9 - (6=47)r8c76 :=> -7r4c6,r78c4; stte |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Tue Apr 14, 2015 4:31 pm Post subject: |
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| I'm confused. The puzzle for the 14th shows as a Hard, not a VH. |
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hughwill
Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
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| Posted: Wed Apr 15, 2015 9:28 am Post subject: |
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| Marty R. wrote: | | I'm confused. The puzzle for the 14th shows as a Hard, not a VH. |
Sorry folks- not sure how that happened. The puzzle was from 2010!
(I have amended the title of the original post)
Hugh |
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dongrave
Joined: 06 Mar 2014
Posts: 568
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| Posted: Thu Apr 16, 2015 2:12 am Post subject: |
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| hughwill wrote: | | Marty R. wrote: | | I'm confused. The puzzle for the 14th shows as a Hard, not a VH. |
Sorry folks- not sure how that happened. The puzzle was from 2010!
(I have amended the title of the original post)
Hugh |
Hey, that's almost happened to me a couple of times Hugh! If you're like me, you probably print out VHs from the archive and do them on days that this site doesn't have a VH. I remember at least a few times that I confused a puzzle that I did one day with this site's puzzle for that day. |
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