When i started a game, my opponent had a ranking of 865, but when we ended the game, he had 766, could he be playing many games simultaneously?
When the game ends, both players' ratings are adjusted and then immediately displayed by your usernames. Most likely it was just your opponent's new rating you are seeing.
he moved 99 points down ...
he moved 99 points down ...
Yes. If you take a look at his profile, he has very few games played. New accounts with few games have very big rating changes because the algorithm is trying to place them in their appropriate rating as quickly as possible. Also, if you go to his profile and check the game, the Info section does show that a loss would result in -99 rating points.
When i started a game, my opponent had a ranking of 865, but when we ended the game, he had 766, could he be playing many games simultaneously?