Looking at the previous rounds, my opponent has chosen scissors twice and rock twice. They seem to counter my paper plays with scissors, and match my rock plays with rock. Since I haven't played scissors yet, this might disrupt any pattern they've detected. If they're anticipating me to continue the paper-rock alternation I've established, they might play scissors expecting my paper, which would result in a tie. If they decide to introduce paper this round (as they haven't played it yet), my scissors would win.