Based on the pattern observed, the opponent tends to play what I played in the previous round. Since I played scissors in round 7, there's a good chance the opponent will play scissors in round 8. Therefore, choosing rock would be strategic. Additionally, the opponent has never played scissors in previous rounds, suggesting they might try it now to be less predictable. Rock would win against scissors. Even if they play rock again (their most common move), it would result in a tie rather than a loss.