Task: Story Composition
Input (English): 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.
Output (English): 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.