Looking at the pattern of play so far, I've won three rounds and just lost the last round when I played scissors and the opponent played rock. The opponent might expect me to switch to paper to counter their rock from the previous round. If they anticipate this and play scissors to counter my expected paper, then playing rock would be advantageous. Additionally, the opponent has shown a tendency to cycle through options, and they haven't played scissors in the last two rounds, making it a more likely choice for them now.