Since the opponent has won more rounds than me, I need to win this round. Given the history, the opponent has chosen paper and rock the most, but also scissors in the last round. To maximize my chances of winning, I will choose rock as it beats scissors, which the opponent chose in round 8 and could choose again, and has a 50% chance against paper and a loss against rock, which seems to be the opponent's less preferred option in the last few rounds.