Please not another SittingDuck...
Fragment of a discussion from Talk:RoboRumble/Participants/Melee
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ELO has a behaviour similar to Rolling Averages. It gradually forgets the past, so, past battles with retired bots stops affecting the ranking after some more uploads are made.
ELO was designed taking in account a changing environment. i.e. chess players improving their skills over time, new players, retired players...
MN