In "Rules of the Game," what is the art of invisible strength?

This is a good question. The above answer does a good job,
but there is more. When Waverly was six years old, her mother began to teach her the art
of invisible strength. According to Waverly, the art of invisible strength was a
strategy that allowed her to win arguments and respect from others. Waverly's mother put
it in these words:

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"Wise guy, he not go against wind. In Chinese we
say, Come from South, blow with wind-poom!-North will follow. Strongest wind cannot be
seen."

Waverly's mother
probably came to these conclusions as a Chinese woman who had to survive in a new world
and land. She needed to be shrewd, wise, and even manipulative at times. She needed more
than brute force; she needed invisible strength, an element of
surprise. 

As the story progresses, Waverly also commented
that the art of invisible strength was very helpful to her in her passion for chess.
Finally, Waverly used this art to counter her mother.