dailysudoku.com

[jabejochke]

For me the breakthru for April 18th's puzzle was finding the 56 pairing at r2c7 and r3c7.

Finding this pair (or 'working it into existence') was both difficult and enlightening while trying to avoid candidate profiling.

To those who found it without profiling, how did it emerge? To those who profiled, how did it show itself? And to those for which this pairing was not the breakthru for this puzzle, what was?

Any comments and insights would be most appreciated. Thanks,

Jack

[David Bryant]

Hi, Jack!

I have to agree that finding the pair {5, 6} was a crucial step. After entering just a few values I arrived at this position.

[Guest]

David,

Thanks again!

I think the logic you described was the way I got there - though I wasn't able to put it into words.

In thinking about your words, it also dawned on me the implications of the 'blocking' effect of the 9,3,1 in column 7 at rows 7,8 & 9 respectively. It would seem that a configuration showing all completed row or column cells within a block is a situation to be checked out prior to committing to profiling.

Right now, my focus (after doing line_block interactions and mandatory pairs on 5+ rcb's) is to work on the already identified pairs on the board prior to committing to profiling. As you and others have documented there are configurations that can be recognized for breakthru's at this point (example possibly being the 6,8 in row 1 at columns 4 & 5 and its impact on block 1). I think I just learned that checking out these 'blocking 3's' may also be a configuration to be worked before profiling.

Again, thank you again

Jack

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[jabejochke]

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[jabejochke]