The game’s been out for long enough, so I’ll be honest: it’s worse than luck. The game is just rigged to last as long as possible for tension lol
There are some strategies such as not using too many calls and switching up your hands. (The opponent does try to “guess” what you’ll do next, sort of. For example, he won’t expect you to throw rock twice, but if you do it 4 times he will catch on.)