Detailed Instructions: Given a premise, an initial context, an original ending, and a counterfactual context, the task is to generate a new story ending aligned with the counterfactual context and as close to the original ending as possible. Each instance consists of a five-sentence story. The premise is the first sentence of a story, and the second sentence, which is the initial context, provides more information about the story's context and the story's general plot. The original ending is the last three sentences of the story. Also, a counterfactual context is a slight modification to the initial context. You should write a new story ending that edits the original story ending as little as possible to regain coherence with the counterfactual context. To sum up, you should write the last three sentences of a story based on the premise(first sentence) and the counterfactual context(second sentence) of the story.
Problem:Premise: Gus looked at the chess board with great interest. 
 Initial Context: He moved his hand for a pawn but took it back. 
 Original Ending: His opponent tilted his head with interest. Gus thought more and went to grab his knight. The opponent gasped with this turn of events. 
 Counterfactual Context: He moved his pawn forward one space.
Solution:
His opponent tilted his head with interest. Gus thought more and wished he had moved his knight. The opponent gasped and made his move for checkmate. 