I think perhaps you are looking at different time controls. A player has a separate rating for blitz, standard, turn based.
Ratings
That may be it. It is still confusing, though, since when you look at their record you apparently cannot tell if they were playing online time-based games(for example, 3 days or 2 days). It is a bit frustrating when you ask for an opponent within a certain rating range only to find out that in reality they are rated much higher than you are comfortable playing against.
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I am a little confused about ratings. Sometimes when I start new online games the person's rating is radically different than when I look at their past games and what they were rated. For example, I started a game against an opponent who supposedly was rated 1280 only to look at his record and find that he was rated several hundred points higher. Does anyone know why that is? Thanks.