After analyzing the previous rounds, I notice the opponent has chosen rock three times (rounds 1, 3, and 4) and scissors once (round 2). They seem to favor rock heavily. While choosing paper would beat their rock pattern, they may anticipate this and switch to scissors to counter my previous paper plays. By choosing rock, I can defend against a potential scissors play from them while maintaining a tie if they stick with rock. Since I'm already leading 2-0, a conservative play makes sense strategically.