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 5

 
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: 3855

PostPosted: Mon Dec 22, 2008 10:54 am    Post subject: Set H Puzzle 5 Reply with quote

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

Play this puzzle online at the Daily Sudoku site

Code:
 after basics and X-Wing
 *-----------------------------------------------------------*
 | 9     34    8     | 2     36   B57    | 46   G57    1     |
 | 34    2     1     | 567   357   8     | 47    9     56    |
 | 6     7     5     | 1     9     4     | 8     2     3     |
 |-------------------+-------------------+-------------------|
 | 47    145   9     | 3     4567  2     | 167  B57    8     |
 | 378   35    6     | 57    578   1     | 9     4     2     |
 | 478   145   2     | 567   478-5 9     | 17    3    G56    |
 |-------------------+-------------------+-------------------|
 | 1     9     3     | 4     2     6     | 5     8     7     |
 | 5     8     7     | 9     1     3     | 2     6     4     |
 | 2     6     4     | 8    B57   G57    | 3     1     9     |
 *-----------------------------------------------------------*

While observing what appeared to be a simple Colors elimination, I noticed that five of the six cells were an incomplete Remote Pairs chain. Would the strong link on <5> in [b6] be called an extension or a transport ... or neither?

BTW, there's still plenty of puzzle left to solve after this elimination.
Back to top
View user's profile Send private message
Steve R



Joined: 24 Oct 2005
Posts: 289
Location: Birmingham, England

PostPosted: Mon Dec 22, 2008 3:58 pm    Post subject: Reply with quote

Well, the conjugates certainly extend the chain.

When I introduced the term “transport,” I specifically had in mind the addition of a conjugate pair to a known pattern, thereby shifting the elimination from one house, in which there happened to be no elimination, to another house, in which there was elimination. This is exactly the position in your grid: the remote pair chain runs from r9c5 to r1c8. This chain would eliminate 5 from r1c5 and r9c8. As it turns out, the pattern is ineffectual in this grid. However, adding the conjugates with respect to 5 in box 6 does indeed produce an elimination. This is about as close to what I had in mind as you could get.

I suggest that “transport” is confined to this particular interpretation. There is no particular reason why the term should be used at all but, if it is worth using, its meaning should surely be precise.

Incidentally, a W-wing is also present: the (47)s in r2c7 and r4c1 are bridged by the conjugates with respect to 7 in column 8. This solves the puzzle.

Steve
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