dailysudoku.com Forum Index dailysudoku.com
Discussion of Daily Sudoku puzzles
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Jun 15 VH

 
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Daily Sudoku puzzles
View previous topic :: View next topic  
Author Message
George Woods



Joined: 28 Mar 2006
Posts: 232
Location: Dorset UK

PostPosted: Fri Jun 15, 2012 9:30 am    Post subject: Jun 15 VH Reply with quote

Code:

After X wing in 5 (cols 1 and 9) and XY in 4 245 pivoted r4c2 and and another probably not needed 467 pivoted r5c6

Code:

+------------+-------------+---------------+
| 9  17  6   | 47  3   2   | 145  145  8   |
| 8  4   3   | 5   9   1   | 7    26   26  |
| 2  17  5   | 467 46  8   |  134 9    34  |
+------------+-------------+---------------+
| 6   25 279 | 3   24  47  | 59   8    1   |
| 45 8   247 | 9   1    67 | 46   3    245 |
| 1  3   249 | 8   246 5   | 469  24   7   |
+------------+-------------+---------------+
| 7  9   8   | 146 5   3   | 2    146  46  |
| 45 6   1   | 2   8   9   | 345  7    345 |
| 3  25  24  | 146 7   46  | 8    1456 9   |
+------------+-------------+---------------+

[url=http://www.dailysudoku.com/sudoku/play.shtml?p=9:17:6:47:3:2:145:145:8:8:4:3:5:9:1:7:26:26:2:17:5:467:46:8: 134:9:34:6: 25:279:3:24:47:59:8:1:45:8:247:9:1: 67:46:3:245:1:3:249:8:246:5:469:24:7:7:9:8:146:5:3:2:146:46:45:6:1:2:8:9:345:7:345:3:25:24:146:7:46:8:1456:9:]Play this puzzle online[/url] at the Daily Sudoku site


finally xyz 245 pivoted at r5c9 solves it
Back to top
View user's profile Send private message
hughwill



Joined: 05 Apr 2010
Posts: 192
Location: Birmingham UK

PostPosted: Fri Jun 15, 2012 11:12 am    Post subject: Jun 15 VH Reply with quote

In the diagram the 5 in r8c7 can be removed because of the
X wing leaving a type something or other UR on 34 which
sets r8c7 to 3. But even this doesn't seem to set it- it still
needs the XYZ. This was a complicated VH- but I thought it
was strangely unsatisfying...
Back to top
View user's profile Send private message
tlanglet



Joined: 17 Oct 2007
Posts: 2461
Location: Northern California Foothills

PostPosted: Fri Jun 15, 2012 12:48 pm    Post subject: Reply with quote

Two additional deletions are available in the posted grid due to "locked candidates" conditions: r1c8<>1 & r6c5<>2.

Code:
 *-----------------------------------------------------------*
 | 9     17    6     | 47    3     2     | 145   45    8     |
 | 8     4     3     | 5     9     1     | 7     26    26    |
 | 2     17    5     | 467   46    8     | 134   9     34    |
 |-------------------+-------------------+-------------------|
 | 6    d25    279   | 3    e24   f47    | 59    8     1     |
 | 45    8     247   | 9     1    g67    |h46    3     245   |
 | 1     3     249   | 8     26    5     | 469   24    7     |
 |-------------------+-------------------+-------------------|
 | 7     9     8     | 146   5     3     | 2     146   46    |
 |a45    6     1     | 2     8     9     | 345   7     345   |
 | 3    c25   b24    | 146   7     46    | 8     1456  9     |
 *-----------------------------------------------------------*



The first of these two deletions opens a w-wing(45)r1c8|r8c1 with SL (5)r9c28. However, this does not result in any direct deletions but transporting (4)r8c1, marked a thru h, does the deed.

If r8c1=4, then r9c3=2, then r9c2<>2, then r4c2=2, then r4c5=4, then r4c6=7, then r5c6=6, then r5c7=4. Now the two pincers in r1c8 & r5c7 give r13c7,r6c8<>4 to complete the puzzle.

I do not know if the pincer transport I used is considered a VH move, but hopefully it is acceptable to some folks........

Ted
Back to top
View user's profile Send private message
Clement



Joined: 24 Apr 2006
Posts: 676
Location: Dar es Salaam Tanzania

PostPosted: Fri Jun 15, 2012 3:07 pm    Post subject: Jun 15 VH Reply with quote

Actually the x-wing on 5 in col 19 mentioned by George Woods above solves it. No other moves needed.
Back to top
View user's profile Send private message AIM Address
Marty R.



Joined: 12 Feb 2006
Posts: 5160
Location: Rochester, NY, USA

PostPosted: Fri Jun 15, 2012 3:33 pm    Post subject: Reply with quote

I used the X-Wing and XYZ-Wing. I've done it twice and needed the 2nd step.
Back to top
View user's profile Send private message
kent7618



Joined: 15 Jun 2012
Posts: 8

PostPosted: Fri Jun 15, 2012 5:55 pm    Post subject: Re: Jun 15 VH Reply with quote

George Woods wrote:


finally xyz 245 pivoted at r5c9 solves it


I solved it the same way without using XY pivoted at r4c2 .

But I can't deduce that r5c6=7 as the system "Hint" showed.
Back to top
View user's profile Send private message Send e-mail
Marty R.



Joined: 12 Feb 2006
Posts: 5160
Location: Rochester, NY, USA

PostPosted: Fri Jun 15, 2012 6:11 pm    Post subject: Re: Jun 15 VH Reply with quote

kent7618 wrote:
George Woods wrote:


finally xyz 245 pivoted at r5c9 solves it


I solved it the same way without using XY pivoted at r4c2 .

But I can't deduce that r5c6=7 as the system "Hint" showed.


I don't know how the hints work, but after the XYZ-Wing, r5c7=6, so r5c6 has to be 7. Don't know if that makes any sense.
Back to top
View user's profile Send private message
kent7618



Joined: 15 Jun 2012
Posts: 8

PostPosted: Sat Jun 16, 2012 4:47 pm    Post subject: Re: Jun 15 VH Reply with quote

Marty R. wrote:
kent7618 wrote:
George Woods wrote:


finally xyz 245 pivoted at r5c9 solves it


I solved it the same way without using XY pivoted at r4c2 .

But I can't deduce that r5c6=7 as the system "Hint" showed.


I don't know how the hints work, but after the XYZ-Wing, r5c7=6, so r5c6 has to be 7. Don't know if that makes any sense.


The "Hint" shows r5c6=7 just after the X-Wing (r8c2=6) and before deducing r5c7=6.
Back to top
View user's profile Send private message Send e-mail
Marty R.



Joined: 12 Feb 2006
Posts: 5160
Location: Rochester, NY, USA

PostPosted: Sat Jun 16, 2012 7:04 pm    Post subject: Reply with quote

Quote:
But I can't deduce that r5c6=7 as the system "Hint" showed.


OK, looking at Ted's grid, it's based on the XY-Wing 246 pivoted in r6c8.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Daily Sudoku puzzles All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group