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From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Mon, 30 Mar 2015 02:57:40 -0600
Subject: Re: Sudoku solver
To: Python <python-list@python.org>
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Xref: csiph.com comp.lang.python:88327

On Mon, Mar 30, 2015 at 2:16 AM, Dave Angel <davea@davea.name> wrote:
> The relationship between row, column and box can be rearranged.  Some of
> these are already covered by the rotations proposed earlier, where for a 90
> degree rotate, row becomes column and column becomes row.  But in a similar
> way each box could become a column, and so on.

I don't think this one is valid. The intersection of a row and a
column is one cell. The intersection of a row and a box is three
cells. If you swap a column with a box, you're changing the
relationships between the squares and the result will not be
isomorphic to the original.