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 

July 31 VH, with apologies to Early Earl

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



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

PostPosted: Fri Jul 31, 2009 12:42 am    Post subject: July 31 VH, with apologies to Early Earl Reply with quote

After basics.

Code:

+----------+---------------+-----------+
| 9  36 45 | 2   68   3468 | 568 7  1  |
| 7  2  45 | 468 1    9    | 568 68 3  |
| 8  36 1  | 5   7    36   | 4   9  2  |
+----------+---------------+-----------+
| 1  4  7  | 68  3    5    | 9   2  68 |
| 6  8  3  | 9   2    1    | 7   5  4  |
| 2  5  9  | 7   4    68   | 3   1  68 |
+----------+---------------+-----------+
| 45 1  6  | 3   58   7    | 2   48 9  |
| 45 79 2  | 1   5689 468  | 568 3  57 |
| 3  79 8  | 46  59   2    | 1   46 57 |
+----------+---------------+-----------+

Play this puzzle online at the Daily Sudoku site

Quote:
In the potential DP 57-59-79 in boxes 789 the only way to kill it is with either a 6 or 8 in r8c5. This forms a 68 pair with r1c5 and that solves it.
Back to top
View user's profile Send private message
crunched



Joined: 05 Feb 2008
Posts: 168

PostPosted: Fri Jul 31, 2009 12:58 am    Post subject: Reply with quote

Impressive indeed, Marty.
I used the more conventional wing solutions. An xyz, followed by an xy.

Quote:
(xyz wing uses 4-6-8 followed by xy wing of 46-48-68 )
Code:

+----------+---------------+-----------+
| 9  36 45 | 2   68   3468 | 568 7  1  |
| 7  2  45 | 468 1    9    | 568 68 3  |
| 8  36 1  | 5   7    36   | 4   9  2  |
+----------+---------------+-----------+
| 1  4  7  | 68  3    5    | 9   2  68 |
| 6  8  3  | 9   2    1    | 7   5  4  |
| 2  5  9  | 7   4    68   | 3   1  68 |
+----------+---------------+-----------+
| 45 1  6  | 3   58   7    | 2   48 9  |
| 45 79 2  | 1   5689 468  | 68  3  57 |
| 3  79 8  | 46  59   2    | 1   46 57 |
+----------+---------------+-----------+

Play this puzzle online at the Daily Sudoku site


Last edited by crunched on Fri Jul 31, 2009 4:08 am; edited 1 time in total
Back to top
View user's profile Send private message
arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA

PostPosted: Fri Jul 31, 2009 1:10 am    Post subject: Reply with quote

I used two steps
Quote:
w-wing 68
w-wing 84
Back to top
View user's profile Send private message
rayswchiu



Joined: 31 Jul 2009
Posts: 1

PostPosted: Fri Jul 31, 2009 1:24 am    Post subject: i used remote pairs Reply with quote

68
Back to top
View user's profile Send private message
David



Joined: 02 Jun 2006
Posts: 58
Location: Bedford, UK

PostPosted: Fri Jul 31, 2009 2:19 pm    Post subject: Reply with quote

C'mon Earl, we all know you have stolen Marty's IP address and pretended to post under his name !

Crunched - unless I made a mistake, can you not solve the puzzle with just the 468 xyz wing ? [/quote]
Back to top
View user's profile Send private message
Marty R.



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

PostPosted: Fri Jul 31, 2009 3:42 pm    Post subject: Reply with quote

Quote:
Crunched - unless I made a mistake, can you not solve the puzzle with just the 468 xyz wing ?

I'm not Crunched...but using his grid I couldn't solve it with the XYZ-Wing. I got stuck here:

Code:

+----------+-----------+-----------+
| 9  3  45 | 2  6   48 | 58  7  1  |
| 7  2  45 | 48 1   9  | 568 68 3  |
| 8  6  1  | 5  7   3  | 4   9  2  |
+----------+-----------+-----------+
| 1  4  7  | 68 3   5  | 9   2  68 |
| 6  8  3  | 9  2   1  | 7   5  4  |
| 2  5  9  | 7  4   68 | 3   1  68 |
+----------+-----------+-----------+
| 45 1  6  | 3  58  7  | 2   48 9  |
| 45 79 2  | 1  589 46 | 68  3  57 |
| 3  79 8  | 46 59  2  | 1   46 57 |
+----------+-----------+-----------+

Play this puzzle online at the Daily Sudoku site
Back to top
View user's profile Send private message
Clement



Joined: 24 Apr 2006
Posts: 1110
Location: Dar es Salaam Tanzania

PostPosted: Fri Jul 31, 2009 4:15 pm    Post subject: Fri 31-Jul-2009 VH Reply with quote

I used three steps:-
1) UR (36)r13c26 eliminating 36 in r1c6.
2) XYZ-Wing (46)r9c4-(468)r8c6-(68)r8c7 eliminating 6 in r8c5 leading to
3) an XY-Wing (46)r9c8-(68)r2c8-(48)r2c4 eliminating 4 in r9c4 completes the puzzle.
Back to top
View user's profile Send private message AIM Address
cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada

PostPosted: Fri Jul 31, 2009 5:51 pm    Post subject: Reply with quote

Looking at Clement's steps - the puzzle can be done with just the two 468 wings. Don't need no UR!
Back to top
View user's profile Send private message
cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada

PostPosted: Fri Jul 31, 2009 5:52 pm    Post subject: Reply with quote

Looking at Clement's steps - the puzzle can be done with just the two 468 wings. Don't need no UR!
Back to top
View user's profile Send private message
David



Joined: 02 Jun 2006
Posts: 58
Location: Bedford, UK

PostPosted: Fri Jul 31, 2009 5:53 pm    Post subject: Reply with quote

Marty,
If you go back to your first grid (posting), then I believe you can eliminate the 5 from R9 C7 to leave 68 (due to the 5's in box 3. Do you not then have an XYZ wing (46-468-68, boxes 8,9) that eliminates the 6 in R9 C8 ?
Back to top
View user's profile Send private message
Roger S



Joined: 20 Jun 2009
Posts: 6
Location: UK

PostPosted: Fri Jul 31, 2009 9:06 pm    Post subject: Reply with quote

Marty

If you go back to your origional post is there an xyz wing in 468-68-46 in
R2c4 (468) R2C8 (6Cool R9C4(46) eliminating the 6 inR9C4 I did that and it dropped out but not sure if its correct
Back to top
View user's profile Send private message
Wendy W



Joined: 04 Feb 2008
Posts: 144

PostPosted: Fri Jul 31, 2009 10:07 pm    Post subject: Reply with quote

This one was a welcome change from the usual no-brainers!
Back to top
View user's profile Send private message
Marty R.



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

PostPosted: Sat Aug 01, 2009 2:03 am    Post subject: Reply with quote

David wrote:
Marty,
If you go back to your first grid (posting), then I believe you can eliminate the 5 from R9 C7 to leave 68 (due to the 5's in box 3. Do you not then have an XYZ wing (46-468-68, boxes 8,9) that eliminates the 6 in R9 C8 ?

David, yes, that 5 should have been gone but the XYZ-Wing in boxes 89 eliminates the 6 from r8c5.

Quote:

If you go back to your origional post is there an xyz wing in 468-68-46 in
R2c4 (468) R2C8 (6Cool R9C4(46) eliminating the 6 inR9C4 I did that and it dropped out but not sure if its correct

Roger, that is an XYZ-Wing, but because it's in three different boxes it doesn't eliminate anything because there's no cell I can see that sees all three of XYZ, XZ and YZ.
Back to top
View user's profile Send private message
tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

PostPosted: Sat Aug 01, 2009 2:49 pm    Post subject: Reply with quote

I used two xy-wings to complete the puzzle.
xy-wing 46-8 with pivot 46 in r9c8 and pseudocell 48 in col4 plus a transport
xy-wing -458 with pivot 58 in r7c5.

Ted
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