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 Post subject: Jigsaw ER Question
PostPosted: Thu Jul 26, 2012 12:39 am 
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Joined: Tue Apr 22, 2008 2:07 am
Posts: 107
Can someone explain in the puzzle below why the following step is called an Empty Rectangle? Also, I do not understand the notation r4c3=4=r4c4. I understand that one of those cells has to be a 4, but the notation is confusing to me.

Here is the step from the Sudoku Solver program:

3. Empty Rectangle in n7 r4c3=4=r4c4
3a. Candidate 4 removed from r4c789 r6c67 r5c6

I understand 3a, my question only involves the ER portion.

Perhaps a little explanation on how to identify where the ER technique exists in a jigsaw puzzle would be helpful, too.

Regards,
George


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