#1 Improvements to rules.isWinner()

[Danny Yoo]

I wrote a small tutorial on using the profiler; here is
the complete source code to the revised rules.py file.
The code is more readable, but at the expense of
depending on the 'board.last_move' attribute.

[Danny Yoo]

Modified rules.py from released version 2

[Danny Yoo]

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See:

http://mail.python.org/pipermail/tutor/2002-June/015085.html

for more details.