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subgroup question

 
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Dave



Joined: 17 Oct 2014
Posts: 1

PostPosted: Fri Oct 17, 2014 9:33 pm    Post subject: subgroup question Reply with quote

Hi, I've been struggling with this for several days. I am told that "the column contains a sub-group of 1,2,3 so 1,2,3 may be eliminated from the top 2 squares. Where and why is the subgroup? Thanks in advance...


Code:

 +-----+
 |268  |
 |     |
 +-----+
 |236  |
 |     |
 +-----+
 |23   |
 |     |
 +-----+
 |138  |
 |     |
 +-----+
 |  5  |
 |     |
 +-----+
 |  4  |
 |     |
 +-----+
 |  7  |
 |     |
 +-----+
 |128  |
 |     |
 +-----+
 |  9  |
 |     |
 +-----+

     
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Sat Oct 18, 2014 3:28 pm    Post subject: Reply with quote

Dave,

I do not see it. The statement is true if 8 is not a candidate in R48, but I cannot say without seeing the whole grid.

Keith
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dongrave



Joined: 06 Mar 2014
Posts: 563

PostPosted: Sun Oct 19, 2014 3:42 pm    Post subject: Reply with quote

Did he actually use the term 'subgroup'? If so, then he must be referring to the 3 squares of this column that intersect with a box - which I'm guessing is why Keith mentioned seeing the rest of the grid - because in order to process a subgroup, you can't just look at the candidates for the column.
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