Looking at the previous rounds, my opponent has shown a fairly even distribution of moves (3 rocks, 2 papers, 3 scissors). Since I'm already ahead 4-2, I only need to avoid losing this round to secure the overall win. The opponent played rock in the last round, and players often avoid repeating the same move, suggesting they might choose paper or scissors now. By playing rock, I'll either win against scissors or tie against rock. Even if I lose to paper, I'll still win the overall game with a score of 4-3. Rock provides the best balance of defensive play while still giving me a chance to win the round.