Ranma ½, part 8 number 4

There's a martial arts eating contest. Ranma-chan has returned from bridal training and Picolet again steals food from the other students. If Ranma-chan loses the match, she has to marry Picolet, and for the first part of the match nothing she does against him works.

Ranma-chan figures out what to do, though, and is able to beat him and avoid marriage.