help solving a puzzle

Post the puzzle or solving technique that's causing you trouble and someone will help

help solving a puzzle

Postby ajacknain » Mon Jan 23, 2006 11:40 pm

[45 56 2 9 1 7 864 864 3
941 8 941 3 2 64 964 5 7
7 63 943 5 8 64 964 2 1
-----------
952 7 6 82 3 98 52 1 4
932 1 93 7 4 5 8632 9683 962
8 4 953 21 6 91 7 93 952
-----------
541 2 9541 641 97 3 654 964 8
431 9 8431 8641 5 81 6432 7 62
6 53 87543 84 97 2 1 943 95]

Could someone help me with a solution to this puzzle. I got it from the sudoku software - the very hard catagory. Also, can you point me to where I can find info on diads and triads. What are they? Thanks, andrew
Washington, dc ps after looking at the preview, I see that I messed up the directions on entering the puzzle, sorry.
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Postby Carcul » Mon Jan 23, 2006 11:49 pm

Hi Ajacknain.

You have a X-Wing on "3" in cells r5c1/r5c7/r8c1/r8c7 that solve the puzzle.

Regards, Carcul
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Re: help solving a puzzle

Postby MCC » Tue Jan 24, 2006 12:34 pm

ajacknain wrote:...after looking at the preview, I see that I messed up the directions on entering the puzzle, sorry.

The reason for the preview is so that you can correct mistakes if they occur or to make alterations to your text before submitting the post.

For help with the correct way to post click here.
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Postby sweetbix » Tue Jan 24, 2006 12:53 pm

ajacknain wrote:Also, can you point me to where I can find info on diads and triads. What are they?

Do you mean pairs and triples?

http://www.angusj.com/sudoku/hints.php
http://www.simes.clara.co.uk/programs/sudokutechniques.htm
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Postby tarek » Tue Jan 24, 2006 3:13 pm

hi ajacknain,

Posting your pencilmarks again:
Code: Select all
*-----------------------------------------------------------------*
| 45     56     2     | 9      1      7     | 864    864    3     |
| 941    8      941   | 3      2      64    | 964    5      7     |
| 7      63     943   | 5      8      64    | 964    2      1     |
|---------------------+---------------------+---------------------|
| 952    7      6     | 82     3      98    | 52     1      4     |
| 932    1      93    | 7      4      5     | 8632   9683   962   |
| 8      4      953   | 21     6      91    | 7      93     952   |
|---------------------+---------------------+---------------------|
| 541    2      9541  | 641    97     3     | 654    964    8     |
| 431    9      8431  | 8641   5      81    | 6432   7      62    |
| 6      53     87543 | 84     97     2     | 1      943    95    |
*-----------------------------------------------------------------*


I think the most important step is to realise that you made an incorrect elimination of 7 in r7c3, this will eventually lead to a contradiction as the the 7 is actually the true occupant of that cell.

Tarek
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