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Generalized X-Wing - Does this also work for Swordfish?
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Lummox JR

Joined: 07 Sep 2005
Posts: 202
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PostPosted: Tue Nov 22, 2005 3:35 am    Post subject: Reply with quote

After giving a lot of thought to this thread I think I've come up with a technique to overarch everything we've discussed here: constraint subsets. It covers the skewed swordfish discussed here and other possibilities for larger sudoku.
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Pat

Joined: 06 Sep 2006
Posts: 128
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PostPosted: Sun Dec 03, 2006 12:21 pm    Post subject: early example of a finless-Franken Swordfish Reply with quote

rkral (2005.Nov.3) wrote:

Code:

 .  *  .  | *  .  *  |  .  .  .
 .  *  .  | *  .  *  |  .  .  .
 .  A  .  | a  .  .  |  .  .  .
 ---------+----------+---------
 .  *  .  | .  .  b  |  .  .  .
 .  *  .  | B  .  .  |  .  .  .
 .  *  .  | .  .  .  |  .  .  .
 ---------+----------+---------
 .  c  .  | .  .  C  |  .  .  .
 .  *  .  | *  .  *  |  .  .  .
 .  *  .  | *  .  *  |  .  .  .





- or today we might write it thus -

Code:

 . * . | * . * | . . .
 . * . | * . * | . . .
 / X / | X / / | / / /
-------+-------+-------
 . * . | / / X | . . .
 . * . | X / / | . . .
 . * . | / / / | . . .
-------+-------+-------
 / X / | / / X | / / /
 . * . | * . * | . . .
 . * . | * . * | . . .



( and today we'd write it more generally - that's progress )


~ Pat
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