a horse by any other name would surely fly as high

Advanced methods and approaches for solving Sudoku puzzles

a horse by any other name would surely fly as high

Postby Pat » Mon Jun 22, 2015 11:37 am

denis_berthier (2015.Jun.17) wrote:
X-Wing:
    In rows 3,6 v can only be in columns 3,6
    conclusion: in columns 3,6 v can only be in rows 3,6 ==> (2, 6) ≠ v
I don't know the origin of the names.


ancient history —
Pappocom (2005.Mar.30) wrote:

    The technique you're looking for is one which I call "X-Wings"
    — named for the Star Wars fighters.

    That may not help you find it,
    but after you've found it you will know immediately why I call it that.
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re: origins of "fish"

Postby Pat » Tue Jun 23, 2015 8:18 am

Mathimagics wrote:
    Any idea why they then turned to fish varieties for hidden triples, etc?

going from 2ness to 3ness
was an awkward process
which started with a 2-2-2 pattern
— a pattern which invited the name "Swordfish"
( named for airplane, not for fish )

by the time proper 3ness was reached,
the name "Swordfish" had stuck
( though the airplane shape no longer fit )

so at 4ness,
someone chose another type of fish —
makes no sense,
goes to show how terms are invented
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Propagation of names

Postby Mathimagics » Tue Jun 23, 2015 9:14 am

Well, I was way off the mark, I thought the fish allusion was based on the child'd card game "Fish", where you ask someone if they are holding a given card (are you hiding this number?). I thought that was pretty clever, so I named my hidden n-tuples routine "Fish"!

I have an option to test it's effectiveness, called "No fishing!"....

I think I'll keep it anyway! 8-)

Thanks for the info ...
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