Chess Mom is the second part of the 6th aired and 7th produced episode in season 4 of Dexter's Laboratory, which aired on May 23, 2003. In this episode, Mom poses as a personal cheerleader to Dexter as he is playing at a chess championship. However, Mom's cheering only leads to Dexter's embarrassment.
Dexter is playing chess at the big championship and his Mom is watching. Unfortunately, she doesn't realize that the audience is to be completely silent during the chess tournament so the players can concentrate. This leads to Dexter's mother being told to leave by the announcer and for Dexter to lose the competition.