I noticed that some of the games, like horde
chess and Maharajah chess, have asymmetrical
starting positions. While a lot of thought has
probably gone into making these games "fair,"
i.e. equal chances for both sides, it is almost
a mathematical certainty that these games aren't
exactly fair. However, they are still fun to
play. I think that having separate ratings for
Black and White would be a good idea, since,
for example, someone who plays white 75% of the
time in horde chess would not have a rating
compatible with someone who plays white 25% of the
time in horde chess.