Looking at the previous rounds, my opponent has played rock twice and paper once. They seem to favor rock, and there may be a tendency to counter my previous move (when I played scissors in round 3, they played rock). Given that my last move was scissors, they might expect me to play rock next (to counter their expected paper). Therefore, I'll play paper to potentially beat their rock if they continue favoring it, or tie if they play paper again. This breaks the pattern of us making the same choice in rounds 1 and 2.