In "The Rules of the Game," what is the wind that whispers to Waverly during her chess game?

I assume you are referring to Waverly's first chess game
that she plays in a tournament. It is clear that as she goes up to play the
fifteen-year-old boy from Oakland who is her opponent, Waverly is nervous, however, when
she starts playing, she very quickly loses all of her
nerves:

As I
began to play, the boy disappeared, the colour ran out of the room, and I saw only my
white pieces and his black ones waiting on the other side. A light wind began blowing
past my ears. It whispered secrets only I could
hear.

It is typical of Amy
Tan's style that she occasionally inserts lyrical passages like this one that show the
imagination of her main character. The next paragraph describes how this wind gives
Waverly strategies which she uses to win the match. The wind could be said to represent
quiet strength or strategy to the narrator, but it also follows Waverly's own earlier
comments about how it is important to keep your opponent guessing, distracting them and
avoiding their traps.