Which detail from "the monkey's paw" is an example of conflict?

Do you have the detail?

Here is an example from "The Monkey's Paw",

Mr. White feels uncomfortable when his son Herbert outsmarts him.It is about the son and father Herbert playing chess. Father tries to distract his son when he makes a mistake. However, the father cannot even achieve it and his son gives a checkmate.

the answer is d Dear Doctor: