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 PA Puzzle 11

 
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: Tue Jan 27, 2009 11:45 am    Post subject: Set PA Puzzle 11 Reply with quote
This puzzle is not about the VH step.

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

Play this puzzle online at the Daily Sudoku site

===== ===== ===== ===== ===== ===== ===== ===== ===== Ratings

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, UR Type 1, X-Wing, XY-Wing, XYZ-Wing

VH+: 2-String Kite, Empty Rectangle, Remote Pair, Skyscraper, Colors, UR Type 2

Advanced: finned/Sashimi X-Wing, Multiple Colors, Swordfish, M-Wing, W-Wing, XY-Chain

Extreme: Jellyfish, (but mostly) Chain
Back to top
View user's profile Send private message
storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Wed Jan 28, 2009 1:17 am    Post subject: Reply with quote
Code:
.---------------------.---------------------.---------------------.
| 9      3      6     | 7      8      5     | 1      2      4     |
| 8      2      4     | 69     1      39    | 356    35679  35679 |
| 5      7      1     | 4      269    239   | 36     369    8     |
:---------------------+---------------------+---------------------:
| 7     B56     8     | 3      4      12    | 9      56     12    |
|W36     1     A239   | 5      7      289   | 4      368 2-[36]   |
| 4      59    A239   | 18     29     6     | 235    78     17    |
:---------------------+---------------------+---------------------:
| 1     B69    A39    | 2      5      7     | 8      4     W36    |
| 236    48     5     | 69     369    48    | 7      1      2369  |
| 236    48     7     | 18     369    148   | 2356   3569   23569 |
'---------------------'---------------------'---------------------'

ok, so skip the UR type 1... done...

notice how the 3's in box 4 in column 3 are strongly linked to the 3 in r7c3
(3)r56c3 = (3)r7c3 marked "A"
forms this w-wing on {6,3} which eliminates the 6 from r5c9.
(6=3)r5c1 - (3)r56c3 = (3)r7c3 - (3=6)r7c9; r5c9 <> 6

now the normal w-wing this time reversing the numbers using the strong link on 6 in column 2 marked "B"
w-wing {3,6} eliminates 3 from r5c9
(3=6)r4c2 - (6)r4c2 = (6)r7c2 - (6=3)r7c6; r5c9 <> 3
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