There seems to be a pattern where my opponent has matched my moves for the first three rounds, then countered with paper against my rock. If they're developing a strategy based on my previous moves, they might expect me to choose paper next (following the standard rock-paper-scissors sequence). If they anticipate this and choose scissors to counter, then my scissors choice would result in a tie. Alternatively, if they stick with paper expecting me to choose rock again, my scissors would win. This choice disrupts any pattern recognition they might be employing.