My girlfriend is a coordinator for ALTA and had an issue come up and figured I'd get people's opinion here. Basically it was after the handshake that one of the teams realized that they may have conceded the match when it was just 5-6 in the third set. (Basically the team that was down was just so distraught over getting broken that they mistakenly thought that they had lost when in reality the other team shoudl have had to serve out the last game. The losing team shook hands and were sitting on the sidelines talking about it. She says that it occurred to her on her own after the match. (maybe 5 minutes later) They conferred with one of the winning players husbands and they worked out that they were a game short based on the fact that it was time to switch sides. My thought woudl be that once both teams mutually agree that the game is over and you start a new game, that you couldn't go back and dispute the score of a previous game. Once both teams mutually agree that a set is over and start the next set then you couldn't go back and dispute the score of a previous set. And so once both teams mutually agree that the match is over by shaking hands that you can't go back and dispute the score. But I figured I'd ask here and see if anyone knew a more "formal" rule since I couldn't find anything at all about when you are allowed to dispute the score.