Answer: Because chess is a game where you need a real poker face. You have to keep your emotions bottled up inside instead of showing them. Because then your opponent will know that you have a great move in mind or something along those lines. She loves these secrets because she wants to be unlike her mother who is always voicing her opinion. She wants to have her secrets to herself and she can through chess.
Hope this helped!
The underlined word isn't there.... 0-0
Hyperbole
If don't know what it means its best to start of with what you do know
Process if elimination.
It's not a simile because it has no like or as.
Its not Personification cause its not giving the object human features.
And its not metaphor cause its not literally Applicable. I'm assuming.
So that just leaves you with hyperbole.