Based on the pattern of my opponent's moves, I notice they've cycled through rock, paper, and scissors fairly evenly (3 times each). Looking at their recent moves, they played rock in round 8 and paper in round 9, which suggests scissors might be next in the sequence. By choosing rock, I can counter their potential scissors play. Additionally, I'm already winning 4-1, so even if this strategy doesn't work, I'll still win the overall match. This is a strategic choice that gives me the best chance to end on a win.