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Jigsaw ER Question http://www.rcbroughton.co.uk/sudoku/forum/viewtopic.php?f=10&t=1025 |
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Author: | nj3h [ Thu Jul 26, 2012 12:39 am ] | ||
Post subject: | Jigsaw ER Question | ||
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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