Looking at the pattern so far, my opponent has chosen rock twice, scissors three times, and paper once. In the last two rounds, they started countering my moves, suggesting they might be adapting to my strategy. Since I played rock in round 6 and lost to their paper, they might expect me to switch to scissors this round to counter their paper. If they anticipate this, they may play rock to beat my expected scissors. Therefore, I'll choose rock which would beat their scissors if they go back to that frequent choice, or tie if they play rock expecting my scissors.