Definition: Given the Question and Answer pair, detect whether the answer is acceptable or not. Denote acceptable answer as "yes", otherwise denote as "no". An acceptable answer is consistent with the context in question, detailed, long, and uses general knowledge of English. Answers that are not definite and suggest a variety of options are not acceptable answers.
Input: Question: I am looking for a word that describes a person described in the description of the title. An example of such a person would be a person who comfortably passes the (easier) qualifiers and gradually performs even better as opponents get tougher in the final stages of a tournament. The person does not necessarily relax when he knows he can easily win, but "naturally" performs better as the stakes get higher. 
Answer: The phrase that describes the act of matching skill/performance according to degree of hardness is "rise to the occasion." I am not aware of a single word that is synonymous with this concept.

yes