Times book 1 puzzle 81

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Times book 1 puzzle 81

Postby glamourbebe » Sun Oct 09, 2005 8:19 am

i'm currently doing 'the times su doku book 1 compiled by wayne gould' and am stuck on puzzle 81. i'm breezing through all the other puzzles but for some reason i can't seem to finish this one. any imput will be much appreciated.

what i have so far.

1** *34 **9
74* **9 ***
3*9 *87 2**

*9* 72* 153
*3* **5 9*7
517 *93 *2*

9*3 *5* **2
*** 3** *96
6** 97* **5
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re: Times book 1 puzzle 81

Postby Pat » Sun Oct 09, 2005 10:54 am

glamourbebe wrote:i'm currently doing 'the times su doku book 1 compiled by wayne gould' and am stuck on puzzle 81.

what i have so far:

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



the 1 for column 6
goes in box 8


- Pat
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Postby Karyobin » Sun Oct 09, 2005 3:02 pm

Whilst Pat is entirely correct, I think it may be worth clarifying that this creates a situation commonly referred to as locked candidates, which implies you can remove 1's as candidates from other cells in Box 8.
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Postby glamourbebe » Mon Oct 10, 2005 4:47 am

thank you for the help but i need a more specific answer.
i know the 1 for column 6 goes into box 8 but i can't decide between rows 8 and 9 because the 1 for column 3 goes into box 7 rows 8 and 9 as well.
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Postby glamourbebe » Mon Oct 10, 2005 4:50 am

actually, i should say how did you find the answer for the 1 in box 8? how did you eliminate the 1 from row 9?
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Postby emm » Mon Oct 10, 2005 5:55 am

I think there might be little steps not one big one. You don't eliminate the 1 in row 9, not yet.

After you sort out the locked 1s in box 8 then look for where the 4s go in box 8 then in box 7. Then you'll have a place for 1 in box 7. After that there are a string of hidden singles all over the place, meanwhile the 1s in box 8 are all still in column 6. Don't give up - all will be revealed.
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