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need help with hint

 
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KSipher



Joined: 24 Sep 2006
Posts: 38

PostPosted: Sun Sep 24, 2006 5:02 pm    Post subject: need help with hint Reply with quote

Hi - I'm trying to learn techniques in solving sudoku puzzles, and am getting better. But I am trying to solve a hard puzzle from the archives and am stuck. I asked for a hint, and was offered the red 7 in the image below, but I don't see how it can be determined. Can someone help me see how the 7 can be found? Thanks -
Kathy
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TexCat



Joined: 07 Jul 2006
Posts: 31

PostPosted: Sun Sep 24, 2006 5:17 pm    Post subject: Reply with quote

In row 4, I see a 57 naked pair. (I think that is the right terminology?). So the 5 and 7 in row 4 have to go in columns 3 and 8. (Though we don't know yet if it's 5 7 or 7 5). That means that row 4 column 4 cannot be 5 or 7. Then you have only 1 possibility for a 7 in column 4.
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KSipher



Joined: 24 Sep 2006
Posts: 38

PostPosted: Sun Sep 24, 2006 5:39 pm    Post subject: Thanks Reply with quote

Thanks for the really quick reply. I'm guess I missed the naked pair - so obvious too. Thanks!
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