Observing the six rounds so far, the opponent has played rock twice (rounds 1 and 6), paper three times (rounds 2, 3, and 5), and scissors once (round 4). Notably, after playing rock in round 1 the opponent shifted to paper in round 2, and after playing rock in round 6 it seems plausible they might repeat the pattern by choosing paper again. Since paper is the most frequent move so far and especially likely after a rock, the best counter is scissors. Therefore, to capitalize if the opponent plays paper in round 7, I choose scissors.