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 

March 20 VH

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



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania

PostPosted: Fri Mar 19, 2010 11:41 pm    Post subject: March 20 VH Reply with quote

Two XY-Wings
1) XY-Wing 45 15 14 eliminating 4 in r46c2 leading to
2) XY-Wing 34 37 47 eliminating 4 in r3c9 solving the puzzle.
Back to top
View user's profile Send private message AIM Address
George Woods



Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK

PostPosted: Fri Mar 19, 2010 11:53 pm    Post subject: or a single w wing Reply with quote

34s acting on 4s in row 1eliminates 3 at r6c2
Back to top
View user's profile Send private message
tlanglet



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

PostPosted: Sat Mar 20, 2010 2:58 am    Post subject: Reply with quote

Finned xy-wing 3-47 with vertex 37 in r6c2, pincer 34 in r3c2, pincer 47 in r6c9 and fin 4 in r6c2 also does the deed.

If the xy-wing is true, r3c9<>4
If the fin is true: (4)r6c2 - r1c2 = r1c7; r3c9<>4.
Both conditions delete 4 in r3c9 to complete the puzzle.

Ted
Back to top
View user's profile Send private message
Marty R.



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

PostPosted: Sat Mar 20, 2010 3:52 am    Post subject: Reply with quote

This was my first one in ages that I couldn't find a one-stepper.

XY-Wing (154)
M-Wing (37)
Back to top
View user's profile Send private message
keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Sat Mar 20, 2010 7:12 am    Post subject: Reply with quote

I found Clement's solution after only a few two-candidate pencil marks.

George's W-wing is a one-stepper.

Keith
Back to top
View user's profile Send private message
Ema Nymton



Joined: 17 Apr 2009
Posts: 89

PostPosted: Wed Mar 24, 2010 9:08 am    Post subject: Reply with quote

.

No solution ...


Code:

+---------------+------------+-----------------+
| 9    45   7   | 8  6   1   | 45    2    3    |
| 135  8    2   | 4  379 79  | 6     19   159  |
| 1346 34   136 | 5  39  2   | 8     7    149  |
+---------------+------------+-----------------+
| 134  3479 139 | 37 5   8   | 2     1349 6    |
| 8    6    139 | 37 2   4   | 139   5    179  |
| 2    347  5   | 9  1   6   | 34    8    47   |
+---------------+------------+-----------------+
| 35 * 2    8   | 6  479 579 | 13459 1349 1459 |
| 56   59   4   | 1  8   3   | 7     69   2    |
| 7    1    369 | 2  49  59  | 3459  3469 8    |
+---------------+------------+-----------------+


Draw/Play gives a hint of '3' at r7c1.
Is it possible to show the way?

Ema Nymton
~@:o|
.
Back to top
View user's profile Send private message
nataraj



Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria

PostPosted: Wed Mar 24, 2010 12:21 pm    Post subject: Reply with quote

Ema Nymton wrote:


Draw/Play gives a hint of '3' at r7c1.
Is it possible to show the way?

Ema Nymton
~@:o|
.

The "5" in row 8 must be in cell r8c1 or r8c2.
Therefore r7c1 cannot be "5"
Back to top
View user's profile Send private message Send e-mail Visit poster's website
Ema Nymton



Joined: 17 Apr 2009
Posts: 89

PostPosted: Wed Mar 24, 2010 5:58 pm    Post subject: Reply with quote

.

nataraj wrote:
Ema Nymton wrote:


Draw/Play gives a hint of '3' at r7c1.
Is it possible to show the way?

Ema Nymton
~@:o|
.

The "5" in row 8 must be in cell r8c1 or r8c2.
Therefore r7c1 cannot be "5"


Thank you. I spent days looking and not seeing.

Ema Nymton
~@:o)
.
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