Stuck and need help/hint!

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Stuck and need help/hint!

Postby suzette » Mon Feb 20, 2006 3:11 pm

Hi! I am new to this forum and Sudoku, and got stuck with this puzzle. Wonder if anyone can help me with a hint/lead?

Original puzzle:
Code: Select all
. . . | . . . | . 8 .
. . . | 8 9 . | . . 2
1 8 . | 7 . 3 | 5 . .
------+-------+------
. 2 . | . . . | . 5 .
5 . 7 | . 4 . | 2 . 9
. 6 . | . . . | . 7 .
------+-------+------
. . 4 | 2 . 7 | . 9 3
2 . . | . 3 1 | . . .
. 7 . | . . . | . . .


Got stucked at this stage and can't proceed further for a few days already!:(
Code: Select all
36  345 2   | 14  16  456 | 9    8   7 
7   45  56  | 8   9   456 | 13   13  2 
1   8   9   | 7   2   3   | 5    46  46
------------+-------------+------------
4   2   138 | 13  7   9   | 1368 5   16
5   13  7   | 6   4   8   | 2    13  9
9   6   138 | 135 15  2   | 1348 7   14
------------+-------------+------------
68  15  4   | 2   568 7   | 16   9   3
2   9   56  | 45  3   1   | 7    46  8
368 7   13  | 9   68  46  | 146  2   5
suzette
 
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Postby vidarino » Mon Feb 20, 2006 3:13 pm

If you look in column 9, both the possible 1s are in the same box, meaning one of them must be true. That means you can erase the other 1s from the same box. That should get you rolling again.:)
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Postby tarek » Mon Feb 20, 2006 4:23 pm

Hi suzette,

Looking at the original puzzle & then at the pencilmarks,

it must be annoying to miss something which you've on several occasions in the same puzzle managed to spot & successfully eliminate candidates........

Happens to the best of us:D

Tarek
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Postby suzette » Tue Feb 21, 2006 3:42 am

Aiyah! How can I miss such an easy one?! Thanks for the lead, folks. Whew!
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Postby MCC » Tue Feb 21, 2006 11:52 am

There is also an xy-wing that enables a 4 to be placed in r8c8

Code: Select all
36  345 2   | 14  16  456 | 9    8   7 
7   45  56  | 8   9   456 | 13   13  2 
1   8   9   | 7   2   3   | 5    46  46
------------+-------------+------------
4   2   138 | 13  7   9   | 1368 5   16
5   13  7   | 6   4   8   | 2    13  9
9   6   138 | 135 15  2   | 1348 7   14
------------+-------------+------------
68 *15  4   | 2   568 7   |*16   9   3
2   9  *56  | 45  3   1   | 7    46  8
368 7   13  | 9   68  46  | 146  2   5


If r7c2=5=>r8c3=6=>r8c8=4
If r7c2=1=>r7c7=6=>r8c8=4
Therefore r8c8=4


MCC
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Postby windbell » Tue Feb 21, 2006 4:07 pm

Code: Select all
6   3   2   4   1   5   9   8   7
7   4   5   8   9   6   3   1   2
1   8   9   7   2   3   5   6   4
----------------------------------------------------------
4   2   3   1   7   9   8   5   6
5   1   7   6   4   8   2   3   9
9   6   8   3   5   2   4   7   1
----------------------------------------------------------
8   5   4   2   6   7   1   9   3
2   9   6   5   3   1   7   4   8
3   7   1   9   8   4   6   2   5

 


The answer~:D
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