Not proud of this but The KM Covert Operations Dept. would occasionally torpedo some arogant hi rated dude by sending in a suicide bomber (often rigged up with a program) who would start a game with say a 2000 rating and..before finishing the game with the target..would tank 7-8 games in a row so the rating would be more like 1400. Then arrogant guy would lose to a 1400 player and take a major ratings hit. This was only done to predatory players but it didn't make it right. It is one example however of how ratings should be taken with a grain of salt.