Analyzing the opponent's moves—rounds one through four he alternated between rock and paper, then in round five he switched to scissors—there might be a pattern emerging. If he is likely to repeat his earlier cycle from rounds one to four, rock is a possible comeback move in round six. Choosing paper would allow me to win if he picks rock, and in worst-case, if he picks paper, it results in a tie. Hence, I choose paper for round six.