can u tell me next step and the technique behind it?

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can u tell me next step and the technique behind it?

Postby yessam » Tue Apr 25, 2006 12:05 pm

Code: Select all
   38     6     138     |  2     9      5      | 148      7     48    |
 | 9       7       5    |  4     3      18    | 128      12      6   |
 | 2       4     18     | 16    7      168    |   9       5       3    |
 |----------------------+----------------------+----------------------|
 | 174     38    6       | 5     2       17   | 18        134       9       |
 | 157     38   29     | 169   4        167    |1528    123     578     |
 | 154    15     29    | 19     8         3   |  6      124     57    |
 |----------------------+------- ---------------+----------------------|
 | 6         9    4     |  3      5          2   |7        8       1     |
 | 15       15    7      | 8      6         4   | 3        9       2     |
 | 38      2      38     | 7      1         9   |  45      6      45    |
 *--------------------------------------------------------------------*
 


is there a technique where I can eliminate 9 from R5C4 considering R3C4 ,R6C4? Similarly in R2C678 18 128 12 -any elimiantion possible here?Pls help
yessam
 
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Postby tarek » Tue Apr 25, 2006 12:36 pm

I liked this solution:
Code: Select all
*--------------------------------------------------------*
| 38    6     138  | 2     9     5    | 148   7     48   |
| 9     7     5    | 4     3     18   | 128   12    6    |
| 2     4     18   | 16    7     168  | 9     5     3    |
|------------------+------------------+------------------|
| 147   38    6    | 5     2     17   | 18    134   9    |
| 157   38    29   | 169   4     167  | 1258  123   578  |
|*145  *15    29   | 19    8     3    | 6     124   57   |
|------------------+------------------+------------------|
| 6     9     4    | 3     5     2    | 7     8     1    |
|*15   *15    7    | 8     6     4    | 3     9     2    |
| 38    2     38   | 7     1     9    | 45    6     45   |
*--------------------------------------------------------*
r6c1 must only contain 4 (Candidates 15 in r6c2,r8c2,r6c1 & r8c1 form a type-1 unique quadrangle)
*-----------------------------------------------*
| 3    6    1   | 2    9    5   | 4    7    8   |
| 9    7    5   | 4    3    8   | 12   12   6   |
| 2    4    8   | 16   7    16  | 9    5    3   |
|---------------+---------------+---------------|
|*17   3    6   | 5    2   *17  | 8    4    9   |
|*17   8    29  | 169  4   *167 | 12   3    5   |
| 4    5    29  | 19   8    3   | 6    12   7   |
|---------------+---------------+---------------|
| 6    9    4   | 3    5    2   | 7    8    1   |
| 5    1    7   | 8    6    4   | 3    9    2   |
| 8    2    3   | 7    1    9   | 5    6    4   |
*-----------------------------------------------*
r5c6 must only contain 6 (Candidates 17 in r4c1,r4c6,r5c1 & r5c6 form a type-1 unique quadrangle)



Even with uniqueness, I've reached a dead-end.........Multiple solutions I'm afraid

tarek
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Postby TKiel » Tue Apr 25, 2006 9:29 pm

Simple Sudoku says 20 solutions.

Tracy
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Re: can u tell me next step and the technique behind it?

Postby QBasicMac » Wed Apr 26, 2006 1:33 am

yessam wrote:can u tell me next step and the technique behind it?


As you saw - there are 20 solutions.

Translation: Either the original puzzle you started on was flawed or you made a mistake posting.

Please find your original puzzle and post it (carefully) with no changes.

We can then see if the problem was there or if you somehow goofed.

Most probably, the puzzle was printed in error in some periodical, but we have guys who can figure out what your original puzzle should have been and thus you can solve it.

Mac
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can u tell me next step and the technique behind it?

Postby yessam » Wed Apr 26, 2006 5:50 am

Here is the original puzzle,Now that you guys have pointed out I notice that the puzzle is 'not symmetrical'. There should have been a number in R8C1 ,Am I right?


-----------------------------------------------*
| x x x | x 9 5 | x 7 x |
| x 7 5 | 4 x x | x x 6 |
| 2 4 x | x x x | x x 3 |
|---------------+---------------+---------------|
| x x 6 | 5 2 x | x x x |
| x x x | x x x | x x x |
| x x x | x 8 3 | 6 x x |
|---------------+---------------+---------------|
| 6 x x | x x x| x 8 1 |
| x x x | x x 4| 3 9 x |
| x 2 x | 7 1 x| x x x |
*----------------------------------------------
Code: Select all
[/quote]
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Postby RW » Wed Apr 26, 2006 7:23 am

Unfortunately no number in r8c1 could make it an unique solution puzzle. If you want a puzzle you can solve, try adding 1 in r5c1.

Alternatively you can add r8c1=7 and change r7c9=1 to r7c9=2.

If you want a tougher puzzle, try r8c1=5 and change r4c3 to 3.

That should give you something to work on.

RW
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