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Anyone know the name of this solving technique?

Posted: Fri Aug 17, 2007 7:14 am
by fatcatz
A while ago I found a solving technique while searching for various solving techniques online but forgot the name. Basically if a cell has only 2 candidates and selecting each candidate in turn results in a candidate on another cell to be always the only candidate then that cell must contain that candidate.

This technique is similar to Nishio but it is not Nishio. Is this a valid solving technique or should be considered a brute force method?

Posted: Fri Aug 17, 2007 11:06 am
by Glyn
Hi Fatcatz

I would consider the most common name for this technique would be "Forcing Chain", it can also be extended to "Forcing Net". Some of these methods have more exotic names when the underlying logic is more immediately obvious.

Personally I don't class them as T&E, but other people may disagree, and even my opinion would depend to some extent as to how far down the line the forced cell actually pops out of the process.

Try out this link from the Players Forum which covers it in more depth. :roll:

Forcing Chains and Nets

All the best


Posted: Fri Aug 17, 2007 12:41 pm
by fatcatz
Glyn, thanks for the info.