I'm choosing scissors because: 1) My opponent has shown a pattern of alternating between scissors and paper in recent rounds, with scissors in round 9, suggesting they might play paper in round 10; 2) I've chosen rock three times in a row, which my opponent likely expects me to continue; 3) Since I need to win this round to tie the game, breaking my pattern while strategically countering their likely paper move gives me the best chance of success.