Looking at the pattern of previous rounds, my opponent has matched my move in 6 out of 9 rounds, creating many ties. The only round I won was when I played paper against rock. For this final decisive round, I'm choosing rock because: 1) My opponent might expect me to continue with paper after round 9, and therefore play scissors to counter, 2) The opponent has shown a preference for rock (played in 4 rounds), and 3) Given the high frequency of ties, breaking pattern with rock gives me a strategic chance to win the game if they play scissors or maintain a tie if they also play rock.