The New Sudoku Players' Forum

by **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

by **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.

by **rliu** » Wed Jan 25, 2006 1:40 pm

Thanks for the hint! I have solved the puzzle

by **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)

by **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

Please help for this one