|"Brain's Chess Mess"|
| Season 16, Episode 6b|
|Original Airdate:|| May 6, 2013|
May 6th, 2013
December 17, 2012
|Written by:||Peter K. Hirsch|
|Storyboard by:||Allan Jeffery|
"The Last Tough Customer"
Brain starts a chess club at school to improve his game and beat Los Dedos, the local chess master. Who knew the best player in the club would be… Rattles?!?
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The episode opens with Arthur saying that lots of people he knows have a hidden talent.
- Los Dedos is Spanish for "the fingers" and she is called that because she drums her nails when she plays and Brain says that it drives her opponents crazy.
- Rattles is revealed to be a skilled chess player.
- When Mrs. MacGrady and George first sign the sign up list for chess club, they write in black/pencil color. Later, Mrs. MacGrady's is shown as red and George's is blue.