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I want to draw attention to the main change I made today. You may notice
that the list of ratings now uses various background colors. Each
background color identifies a different network of players. The
predominant network is yellow, and the rest are other colors. Everyone in
a network is connected by a chain of opponents, all of whom are also in
the network.

Regarding weighted histories, they probably work better for the world of
competitive Chess, in which active players normally play several rated
games at regular intervals. This frequency and regularity provides a basis
for weighting games. But Game Courier lacks anything like this. Games here
are played at the leisure of players.