I'm choosing rock for the final round because I notice my opponent has shown a fairly balanced strategy throughout the game. Looking at recent patterns, they went paper-rock-scissors in rounds 7-9. If they follow a pattern of not repeating the immediately previous move, they may avoid scissors this round. Additionally, if they're trying to anticipate my move, they might expect me to play paper (to counter an expected rock) or scissors (to repeat my previous move), both of which would lose to rock. This is a critical round where I need a win to tie the match, so I'm making a calculated risk based on psychological gameplay rather than pure randomness.