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Locked Candidates ?

 
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eastie

Joined: 01 May 2006
Posts: 2
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PostPosted: Wed May 03, 2006 8:44 pm    Post subject: Locked Candidates ? Reply with quote

Hello everyone, I have been playing Sudoku for a few weeks now, I have a lot of Michael Mepham's books, and I have progressed through them fairly well.

I came across this website and I perused around until I found Ruud's post that has websites describing all the different strategies that people use to solve Sudoku puzzles. I recognized many of the patterns I use all the time in solving Sudoku on the website I looked at.

I felt pretty good about myself because I had been reading peoples' posts and seeing suggestions like "hidden singles" and other things with cool names. I realized that I had been using those strategies all along, but I didn't know they had specific names.

So my question came to me when I read the description of locked candidates. The technique reminded me of something I read about on Wikipedia called "contingencies".

Quote:
Wikipedia: Advanced solvers look for "contingencies" while scanning—that is, narrowing a numeral's location within a row, column, or region to two or three cells. When those cells all lie within the same row (or column) and region, they can be used for elimination purposes during cross-hatching and counting


I guess my question is are these the same thing? Or am I missing something in either definition?

Thanks,
John
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Ruud
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Joined: 17 Sep 2005
Posts: 708
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Location: Netherlands

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PostPosted: Wed May 03, 2006 9:39 pm    Post subject: Reply with quote

Hi eastie,

in Sudoku, the single most reinvented technique is "locked candidates".

The "contingencies" description in Wikipedia is one version.

This technique is known by the following names (and more)

    Locked candidates (1 & 2)
    Pointing pairs
    Line-box interactions
    Line-box reductions
    Block-block
    Rowcol-block

Ruud.
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