Your opponent has played paper and scissors so far, showing some variety. There might be a tendency for AI opponents to avoid repeating the same move multiple times, making rock less likely for them to play next. Since they played scissors last round, they might switch to rock (expecting you to play paper), or repeat scissors (thinking you'll avoid it). If they play rock, paper would win. If they play scissors again, paper would lose. If they play paper, it's a tie. Given that you're behind in score, taking a calculated risk with paper seems reasonable as it counters rock, which could be their next strategic choice.