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 

I refuse to be intimidated!

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



Joined: 19 Sep 2005
Posts: 3184
Location: near Detroit, Michigan, USA

PostPosted: Mon Jun 18, 2012 10:51 pm    Post subject: I refuse to be intimidated! Reply with quote

Pat's kind of puzzle.

This can be solved with basic moves.

In my arrogance, I try to do these with no pencil marks. After two days, I am still staring at it.

Code:
Puzzle: FP061712Sun
+-------+-------+-------+
| . . 4 | . 1 . | . 7 2 |
| . . 6 | . . 4 | 8 9 . |
| . . . | 5 . . | . . . |
+-------+-------+-------+
| 4 . . | . . . | . . 3 |
| . . . | 4 8 2 | . . . |
| 2 . . | . . . | . . 9 |
+-------+-------+-------+
| . 7 . | . . 5 | . . . |
| . 8 2 | 7 . . | 1 . . |
| 9 . . | . 3 . | 5 . . |
+-------+-------+-------+

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



Joined: 23 Feb 2010
Posts: 165

PostPosted: Wed Jun 20, 2012 11:06 am    Post subject: re: FP061712Sun Reply with quote


    (3,9) r5\b4

      that's shorthand for
      2 separate moves in same houses
      ( not a duo )

    . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . -
    time for me to confess

    yes i like solving on paper

    observing a duo, i will annotate the puzzle -- framing the 2 cells
    (can be awkward in a box, worse when it's a trio)

    lesser moves (box\line, line\box) are not annotated on the puzzle --
    but all observations are recorded in margin-notes
    (this allows me later to report my solution-path)

    many of the observations will turn out to be red herrings,
    those i will erase
Back to top
View user's profile Send private message
keith



Joined: 19 Sep 2005
Posts: 3184
Location: near Detroit, Michigan, USA

PostPosted: Tue Jun 26, 2012 7:02 am    Post subject: Reply with quote

After clearing singles, there are a number of row / block intersections. The last of these reveals two more singles, labeled #.
Code:
+-------------------+-------------------+-------------------+
| .     5     4     | .     1     .     | .     7     2     |
|#1     .     6     | .    #7     4     | 8     9     5     |
| .     .     .     | 5     .     .     | .     .     .     |
+-------------------+-------------------+-------------------+
| 4     .     .     | .     .     .     | 2     .     3     |
| .     .     .     | 4     8     2     | .     .     .     |
| 2     .     .     | .     .     .     | .     .     9     |
+-------------------+-------------------+-------------------+
| 6     7     3     | 1     .     5     | 9     .     8     |
| 5     8     2     | 7     .     .     | 1     3     .     |
| 9     4     1     | .     3     .     | 5     .     7     |
+-------------------+-------------------+-------------------+

Now, look at the solved cells. There is a pair 16 in C2B4 (check C13) and a hidden pair 17 in C6B5 (check C45).

You should be able to see these without pencil marks. I sometimes can.
Code:
+-------------------+-------------------+-------------------+
|  .     5     4     | 3689  1     3689  | 36    7     2     |
|#1     23    6     | 23   #7     4     | 8     9     5     |
| 378   239   789   | 5     26    368   | 346   146   146   |
+-------------------+-------------------+-------------------+
| 4     16    578   | 69    569   1679  | 2     1568  3     |
| 37    39    579   | 4     8     2     | 67    156   16    |
| 2     16    578   | 36    56    1367  | 467   14568 9     |
+-------------------+-------------------+-------------------+
| 6     7     3     | 1     24    5     | 9     24    8     |
| 5     8     2     | 7     469   69    | 1     3     46    |
| 9     4     1     | 268   3     68    | 5     26    7     |
+-------------------+-------------------+-------------------+


Keith
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