Looking at the pattern so far, my opponent has played rock twice (rounds 1 and 3) and scissors once (round 2). After playing scissors, they returned to rock. There might be a tendency for them to favor rock, but they could also be trying to establish a pattern of alternating between rock and scissors. If they follow that pattern, they would play scissors next, which rock would beat. Additionally, since I won with paper in round 1, they might anticipate me using paper again and counter with scissors. Playing rock provides protection against a potential scissors play while resulting in a tie if they choose rock again.