Looking at the pattern so far, my opponent played rock in round 1 and paper in round 2, potentially showing a progression through the options. If they follow this pattern, they might choose scissors next. Additionally, since they've already played rock and paper, they might be more likely to play scissors to complete all three options. Playing rock would be a good counter to scissors. My opponent might also be anticipating that I'll try to counter their previous paper move with scissors, so they might choose rock again - in which case we'd tie.