Since the current score is 4-2 in my favor, I need to win or tie this round to guarantee a win. The opponent's previous moves have been unpredictable, but I notice that they chose rock in rounds 3 and 9. Given that I won the last round with paper, I'll choose scissors to beat paper in case they choose paper again, or to tie if they choose scissors. This move also has a chance to win if the opponent chooses rock, but it's a risk I'm willing to take.