Looking at the previous rounds, I notice my opponent has chosen paper twice, scissors once, and rock once. There's a potential pattern of paper-scissors-rock-paper, which might suggest scissors coming next. Choosing rock would counter scissors effectively. Additionally, rock was my successful move in round 2 - the only round I've won so far. While the opponent might anticipate this thinking, I'll take the calculated risk with rock, as it gives me the best statistical chance based on observed patterns.