If your child plays chess and can beat you, encourage them to teach you.  Teaching another is a powerful way to learn.  You must really know the subject in order to break it down to explain it to someone else.

Think of a time when you taught someone something.  Didn’t you learn something about the subject during the process?  You must look at (and understand fully) the basics of the subject.  It is hard not to become more expert yourself when you teach someone else.

Plus it is a huge confidence boost for any child to be able to teach an adult.  Children have accepted help for years, learning from you.  Being able switch roles for a moment, teaching the teacher, is huge.  It is an experience which stays with a child, throughout their lives.