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 

Set H Puzzle 50

 
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Puzzles by daj
View previous topic :: View next topic  
Author Message
daj95376



Joined: 23 Aug 2008
Posts: 3854

PostPosted: Sat Jan 10, 2009 12:35 am    Post subject: Set H Puzzle 50 Reply with quote

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

Play this puzzle online at the Daily Sudoku site

===== ===== ===== ===== ===== ===== ===== ===== ===== ===== ===== ===== =====

Can be solved using steps from ...

Basics: Naked/Hidden Single, Naked Pair/Triple, Locked Candidate 1/2

Basics+: Naked Quad, Hidden Pair/Triple/Quad

VH: BUG+1, Remote Pair, UR Type 1, X-Wing, XY-Wing

Advanced: 2-String Kite, Empty Rectangle, Skyscraper, UR Type 2, XYZ-Wing

Extreme: finned X-Wing, M-Wing, W-Wing, XY-Chain

Extreme+: Swordfish, Jellyfish, (but mostly) Chain
Back to top
View user's profile Send private message
Marty R.



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

PostPosted: Sat Jan 10, 2009 8:24 pm    Post subject: Reply with quote

A three-stepper but the first step did nothing.

Quote:
XYZ-Wing (234), ER (8 ) and Type 4 UR (89)
Back to top
View user's profile Send private message
storm_norm



Joined: 18 Oct 2007
Posts: 1741

PostPosted: Sat Jan 10, 2009 9:19 pm    Post subject: Reply with quote

Code:
.---------------------.---------------------.---------------------.
| 5      49     349   | 7      2      6     | 1      34     8     |
| 23     6      1     | 4      35     8     | 359    7      239   |
| 78     24     78    | 35     1      9     | 3456   234    2346  |
:---------------------+---------------------+---------------------:
| 4      7      28    | 35     9      135   | 38     6      123   |
| 9      3      6     | 2      8      14    | 7      14     5     |
| 28     1      5     | 6      34     7     | 3489 234(89)  2349  |
:---------------------+---------------------+---------------------:
| 1      459    3479  |U89     3456   345   | 2    34(89)   34679 |
| 237    8      23479 | 1      346    234   | 3469   5      34679 |
| 6      2459   2349  |U89     7      2345  | 3489 134(89)  1349  |
'---------------------'---------------------'---------------------'

notice the UR marked above on {8,9}

simply put... if candidate 8 and 9 do not exist in r6c8 then the UR is forced to exist...
therefore, any other candidates in r6c8 cannot exist, this eliminates the 2,3 and 4 from r6c8 and solves the puzzle.
-----

this alternative way of viewing the UR is, for my money, easier than noticing that the {1,3,4} naked triple in column 8 exists because of the UR.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Puzzles by daj 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