What does "cost" mean here? I don't see anything that can be "cost" here.
The use of "cost" is rather unusual here. "Cost" usually refers to the price or value of something you have to give up to obtain another. Based on general context clues, we can see Mr. Shaibel intends to mean that Beth has a gift (for chess), and also has what it takes to succeed. Mr. Shaibel could have been using "costs" here for a foreshadowing effect, to predict or warn that she will have to give up something to become successful in the future. Ex: I'm not worried about you. I know you've got what it takes. Ex: Sign up for our audition program! Do you have what it takes to become a star?