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Please Explain strong incompatibility

 
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MollyShark

Joined: 19 Nov 2005
Posts: 1
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PostPosted: Sat Nov 19, 2005 8:54 pm    Post subject: Please Explain strong incompatibility Reply with quote

Working through a puzzle I come to a dead end. I plugged the values into the Sudoku Assistant and it gives me the message:

r7c5 ISN'T 6: strong incompatibility on 6 at cell r7c5 (involving nodes r1c5#6 chain 1(1) and r7c3#6 chain 1(0))

Now there is nothing that clearly disproves the existence of a 6 at r7c5 other than a lot of other possibilities for 6s in the neighborhood, some with only 2 possible values in a cell. So what makes a 'strong incompatibility?"

Incidentally if there is a way to linking to that puzzle in the assistant, would you let me know? Picture and 1000 words, so to speak.

Thanks.

mShark
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rkral

Joined: 21 Oct 2005
Posts: 233
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PostPosted: Sun Nov 20, 2005 4:38 am    Post subject: Re: Please Explain strong incompatibility Reply with quote

MollyShark wrote:
Working through a puzzle I come to a dead end.


If you post the puzzle ... with remaining candidates ... at your dead end point, someone might be able to figure it out.
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