Looking at the pattern so far, my opponent played paper in round 1 and scissors in round 2. There's a possibility they might follow a rotation pattern (paper → scissors → rock), in which case paper would beat their rock. Additionally, since I won with rock last round, they might expect me to play rock again and choose paper in response - making paper a safer choice than scissors. Playing paper gives me a good chance to either win or tie this round while maintaining unpredictability in my strategy.