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hidden pairs

 
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atm
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PostPosted: Thu Dec 29, 2005 9:48 pm    Post subject: hidden pairs Reply with quote

Can anyone tell me what "hidden pairs" are? I think that's the concept that's stumping me on the harder puzzles.
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PostPosted: Thu Dec 29, 2005 10:49 pm    Post subject: Reply with quote

If you have, say, a possible 1,2 plus other rubbish in only two little boxes in a col, row or group, then you can remove the 'other rubbish' from those two boxes.
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dotdot



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PostPosted: Thu Dec 29, 2005 11:15 pm    Post subject: hidden pairs Reply with quote

Have a look here under the heading Hidden Subset.

I think hidden is to some extent an artefact of working with full candidate lists: such pairs are buried under the mass of candidates.
They can often be discovered as a plain pair after going a different logical route (or with hindsight).
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