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Linked Pairs not available as hint?

 
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phratds



Joined: 02 May 2007
Posts: 1
PostPosted: Wed May 02, 2007 9:12 pm    Post subject: Linked Pairs not available as hint? Reply with quote
Hi,
I got stuck on a randomly generated sudoku from my palm, so I wanted to get some help from dailysudoku. The puzzle is here:
Code:

+-----------+--------------+---------------+
| 49   1 49 | 3   68    5  | 68  7    2    |
| 3    5 7  | 68  2     4  | 1   89   69   |
| 2    6 8  | 1   7     9  | 4   5    3    |
+-----------+--------------+---------------+
| 469  7 2  | 689 4568  68 | 3   1    4589 |
| 149  8 5  | 2   14    3  | 7   6    49   |
| 1469 3 49 | 689 14568 7  | 289 2489 4589 |
+-----------+--------------+---------------+
| 8    4 6  | 7   9     2  | 5   3    1    |
| 5    2 1  | 4   3     68 | 689 89   7    |
| 7    9 3  | 5   68    1  | 268 24   468  |
+-----------+--------------+---------------+

Play this puzzle online at the Daily Sudoku site

The Draw/play has no hint available, and the grade is "too hard". Eventually, I figured out the "linked pairs" hint from the palm program. It's saying the '68' pairs in R1C7 and R8C6 are linked (via R1C5/R9C5) to eliminate the '68' from R8C7. With a 9 in R8C7, the puzzle is 'easy'.

Are linked pairs not in the dailysudoku solving capability? Is there another way to solve the puzzle w/o them?

Thanks
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Steve R



Joined: 24 Oct 2005
Posts: 289
Location: Birmingham, England
PostPosted: Thu May 03, 2007 1:31 am    Post subject: Reply with quote
Bear in mind that the solver is designed to match the setter: it will identify x-, xy- and xyz-wings but nothing more. Your technique (remote pairs) is not included although it is by far the neatest way to solve this puzzle if you employ pencil marks.

You could alternatively note that 6 is confined to just two places in column 5 (row 1 and r9c5) and just two places in box 3 (row 1 and r2c9). As row 1 cannot contain two 6s, it follows that a 6 must lie in one of the other two cells. Thus 6 may be eliminated from any common associate of these, here r9c9, and the puzzle is again solved.

Steve
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