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Apr 6 2010 VH

 
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hughwill



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

PostPosted: Tue Apr 14, 2015 8:41 am    Post subject: Apr 6 2010 VH Reply with quote

(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   |
+--------+--------------+-----------+

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

PostPosted: Tue Apr 14, 2015 10:10 am    Post subject: Reply with quote

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

PostPosted: Tue Apr 14, 2015 4:31 pm    Post subject: Reply with quote

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

PostPosted: Wed Apr 15, 2015 9:28 am    Post subject: Reply with quote

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

PostPosted: Thu Apr 16, 2015 2:12 am    Post subject: Reply with quote

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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