Looking at the previous rounds, I notice the opponent has followed a pattern of rock→scissors→paper. If they continue this pattern, they would choose rock next. However, since I've used paper twice already (in rounds 1 and 3), they might anticipate me choosing paper again and counter with scissors. By choosing rock, I can beat their scissors if they try to counter my expected paper move. Even if they follow their original pattern and play rock, we'll tie, which still keeps me ahead in the game.