Waverly's actions of challenging her brother to a chess match and entering a chess tournament, as well as Mrs. Jong's discovery and encouragement of Waverly's talent, contribute to the development of the plot in the story.
(a) Two ways in which Waverly's actions or reactions change the situation and move the plot forward are when she challenges her brother to a chess match and when she decides to enter a chess tournament. These actions create conflict and propel the story forward.
(b) Two ways in which Mrs. Jong's actions or reactions change the situation and move the plot forward are when she discovers Waverly's talent for chess and encourages her to pursue it, and when she pushes Waverly to work hard and improve her skills. These actions contribute to Waverly's growth and development as a character. Waverly's actions of challenging her brother to a chess match and entering a chess tournament, as well as Mrs. Jong's discovery and encouragement of Waverly's talent, contribute to the development of the plot in the story.