Sudoku

[Damien Wyart]

* Eric Parry <joan4eric at gmail.com> in comp.lang.python:
> I downloaded the following program from somewhere using a link from
> Wikipedia and inserted the “most difficult Sudoku puzzle ever” string
> into it and ran it. It worked fine and solved the puzzle in about
> 4 seconds. However I cannot understand how it works. It seems to go
> backwards and forwards at random. Can anyone explain how it works in
> simple terms?

You might also be interested in the following:

http://norvig.com/sudoku.html
http://norvig.com/sudopy.shtml

-- 
DW