Please help for this one

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Please help for this one

Postby rliu » Wed Jan 25, 2006 10:18 am

Hi All,

The initial puzzle (from Pappocom, difficulty 2) is:
Code: Select all
..5|.6.|8.7
..1|...|..4
7..|.1.|...
---+---+---
..3|..9|.8.
5.8|...|1.9
.2.|8..|7..
---+---+---
...|.2.|..6
4..|...|5..
2.9|.5.|3..


After some manipulations, here is the state where I cannot proceed further:

Code: Select all
3    49   5    |249  6    24   |8    1    7
68   689  1    |379  89   3578 |2    59   4
7    489  2    |49   1    58   |6    59   3
---------------+---------------+---------------
16   16   3    |5    7    9    |4    8    2
5    7    8    |26   4    26   |1    3    9
9    2    4    |8    3    1    |7    6    5
---------------+---------------+---------------
18   5    7    |13   2    38   |9    4    6
4    3    6    |179  89   78   |5    2    18
2    18   9    |46   5    46   |3    7    18


Please help.

Regards,
Ricky
rliu
 
Posts: 16
Joined: 26 September 2005

Postby CathyW » Wed Jan 25, 2006 10:28 am

You have a naked triple in box 2 so you can eliminate 2, 4 and 9 from other cells in that box. The rest should be straightforward.
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Postby rliu » Wed Jan 25, 2006 1:40 pm

Thanks for the hint! I have solved the puzzle:D
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Posts: 16
Joined: 26 September 2005

Postby tarek » Wed Jan 25, 2006 2:08 pm

There is also a double that solves this
Code: Select all
*--------------------------------------------------------*
| 3     49    5    | 249   6     24   | 8     1     7    |
| 68    689   1    | 379   89    3578 | 2     59    4    |
| 7     489   2    | 49    1     58   | 6     59    3    |
|------------------+------------------+------------------|
| 16    16    3    | 5     7     9    | 4     8     2    |
| 5     7     8    | 26    4     26   | 1     3     9    |
| 9     2     4    | 8     3     1    | 7     6     5    |
|------------------+------------------+------------------|
| 18    5     7    | 13    2     38   | 9     4     6    |
| 4     3     6    | 179   89    78   | 5     2     18   |
| 2     18    9    | 46    5     46   | 3     7     18   |
*--------------------------------------------------------*
r2c4 Must only have 37 as valid Candidates (37 is a Hidden Double in Row 2)
r2c6 Must only have 37 as valid Candidates (37 is a Hidden Double in Row 2)
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Postby rliu » Mon Feb 06, 2006 5:29 am

Hi tarek,

Thanks! I did not notice about it. So, I missed 2 methods to solve this puzzle.

Regards,
Ricky Liu
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Posts: 16
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