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 28 DB

 
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Other puzzles
View previous topic :: View next topic  
Author Message
Earl



Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
PostPosted: Sat Mar 28, 2009 2:44 pm    Post subject: March 28 DB Reply with quote
The March 28 DB is a multi-tasker. I had to color twice (1,5) then use an xy-chain to eliminate <7's>. There must be a more direct route.


Earl

Code:

+-------+-------+-------+
| . . . | . . . | . 7 9 |
| . 3 . | . . . | 6 . . |
| . . 9 | 5 8 7 | . . . |
+-------+-------+-------+
| 9 . . | . . 6 | . 2 . |
| . . 6 | . 2 . | 3 . . |
| . 1 . | 8 . . | . . 5 |
+-------+-------+-------+
| . . . | 4 7 3 | 2 . . |
| . . 8 | . . . | . 4 . |
| 3 9 . | . . . | . . . |
+-------+-------+-------+

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



Joined: 04 May 2007
Posts: 769
Location: ontario, canada
PostPosted: Sat Mar 28, 2009 4:12 pm    Post subject: Reply with quote
Good one. I used an x-wing on 7, ER on 1, colouring on 5 and a UR.
Back to top
View user's profile Send private message
arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
PostPosted: Sat Mar 28, 2009 5:22 pm    Post subject: Reply with quote
Several skyscrapers, a w-wing(15) and 2 ur's
Very Happy good puzzle
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 28, 2009 9:34 pm    Post subject: Reply with quote
I used an M-Wing on 15 plus a pincer transport, then a W-Wing on another set of 15 cells, then a Type 1 UR on 15 followed by an XY-Chain.
Back to top
View user's profile Send private message
storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Sun Mar 29, 2009 8:21 am    Post subject: Reply with quote
Code:
.------------------.------------------.------------------.
| 1458  2458  15   | 3     6     12   | 58    7     9    |
| 58    3     7    | 19    4     129  | 6     58    12   |
| 16    26    9    | 5     8     7    | 14    3     124  |
:------------------+------------------+------------------:
| 9   E4-58   3    | 17   *15    6    |E148   2     147  |
| 458   458   6    | 179   2     159  | 3    *18    147  |
| 7     1     2    | 8     3     4    | 9     6     5    |
:------------------+------------------+------------------:
| 156   56    15   | 4     7     3    | 2     9     8    |
| 2     7     8    | 6     9     15   | 15    4     3    |
| 3     9     4    | 2    *15    8    | 7    *15    6    |
'------------------'------------------'------------------'

the skyscraper on 1's masks the single step move.
using the strong link on 1's in row 9 to connect the {1,5} cell in r4c5 and the {1,8} cell in r5c8.
either the 5 is true in r4c5 or the 8 is true in r5c8...
extend the 8 from r5c8 to r4c2 and the 5 in r4c2 can be eliminated...
solving the puzzle in one step.
this is the chain...
(5=1)r4c5 - (1)r9c5 = (1)r9c8 - (1=8)r5c8 - (8)r4c7 = (8)r4c2; r4c2 <> 5

the part marked in RED should look familiar.
its basically a disguised w-wing except in this w-wing, the pincers are 5 and 8
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Other 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