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=head1 DESCRIPTION

This module provides a single function, C<elo> which allows one
to calculate individual ratings based on performance. Typically, a
player
is given an initial provisional rating of 1600 points. 
In all cases, one gains and loses
points as a function of the playing strength of both parties and the result
of their encounter.

The formula used is:

    A2 = A1 + 32 (  G - ( 1 / ( 1 + 10 ** ( ( B1 -A1) / 400 ) ) ) )

=over 

=item A2 is Alice's post-game rating

=item A1 is Alice rating before the game against Bob

=item B1 is Bobs rating before the game against Alice