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Sept. 27 puzzle

 
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lolumens



Joined: 25 Aug 2005
Posts: 5

PostPosted: Tue Sep 27, 2005 8:44 pm    Post subject: Sept. 27 puzzle Reply with quote

I got this far:
X-3 9-- 87-
89- --- -6-
4-- --8 -59
6-- 2-- 983
31- -9- 62-
92- --6 -15
54- 183 -96
-36 --9 -48
-89 --4 53-

The hint was a 2 where I have an X
I don't understand the logic, can someone help me?
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Louise56



Joined: 21 Sep 2005
Posts: 94
Location: El Cajon, California USA

PostPosted: Tue Sep 27, 2005 9:07 pm    Post subject: Re: Sept. 27 puzzle Reply with quote

lolumens wrote:
I got this far:
X-3 9-- 87-
89- --- -6-
4-- --8 -59
6-- 2-- 983
31- -9- 62-
92- --6 -15
54- 183 -96
-36 --9 -48
-89 --4 53-

The hint was a 2 where I have an X
I don't understand the logic, can someone help me?


Look at the first column, bottom two spaces (c1r8, c1r9) In that 3x3 box, the 1's must be in either c1r8 or c1r9. Since a 1 must be in either of those two boxes, there cannot be a 1 in c1r1, otherwise there would be two 1's in the first column. You can now eliminate from c1r1 every number but a 2.

Good luck with the rest!
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lolumens



Joined: 25 Aug 2005
Posts: 5

PostPosted: Tue Sep 27, 2005 11:50 pm    Post subject: Thank you. Reply with quote

Thank you, Louise.
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zigzagpython



Joined: 27 Sep 2005
Posts: 4

PostPosted: Wed Sep 28, 2005 9:58 am    Post subject: Reply with quote

Thx for your hints. I solved it finally but still don't understand how to regonize only ' 2 ' in r1c1
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geoff h



Joined: 07 Aug 2005
Posts: 58
Location: Sydney

PostPosted: Wed Sep 28, 2005 10:49 am    Post subject: Reply with quote

I'm assuming you have no problems in reaching the stage in solving the puzzle as shown in lolumen's posting. Consider Box Nr 7 ( r7c1 - r9c3 ).
The Nr 1 can not appear in r7c3 because it is already in r7c4. Therefore, Nr 1 MUST be in either r8c1 or r9c1 in order to satisfy Box Nr 7.

Therefore, we are now considering Column 1. The only possibilities for r1c1 are Nrs 1 and 2. However, since Nr 1 must be in either r8c1 or r9c1, we can delete it from r1c1 leaving Nr 2 as the only possibility.

Cheers.
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Guest






PostPosted: Wed Sep 28, 2005 3:25 pm    Post subject: Reply with quote

Thx very much Geoff. now I clearly understand in where I got stuck.
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