Well, DD is very clear about not wanting to compete in anything, generally speaking. So it's possible she was asked if she was interested during club, and said no. She also doesn't express much passion for the game. She is serviceable at it, though. Actually, she is noticably improving (though no longer in club, she gets chess instruction at school). I think she really does not want to be shown up by her brother, which could get sticky.

Personality-wise, neither child is a shrinking violet. But DD is prickly and often rather difficult with adults. DS is sort of naturally magnetic.