Looking at the pattern so far, my opponent has chosen scissors twice (rounds 1 and 3) and rock once (round 2). There's a possibility they might continue favoring scissors, which they've chosen in 2/3 rounds. Additionally, since I've played scissors in my last round, they might expect me to continue with that choice. I'm choosing rock because it will defeat scissors if my opponent repeats their most common choice, and it would tie against rock if they attempt to counter my previous scissors play. This seems like the most strategic move given the limited pattern data available.