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I refuse to be intimidated!

 
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keith



Joined: 19 Sep 2005
Posts: 3355
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
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Pat



Joined: 23 Feb 2010
Posts: 207

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
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keith



Joined: 19 Sep 2005
Posts: 3355
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
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