Some gamers use Rock Paper Scissors to test timing and psychology-- do you go first, mirror moves

https://rock-paper-scissors-gambling-s-w-m-w7-994.wordcanopy.com/posts/the-history-of-rock-paper-scissors-gambling-in-10-milestones

Some players utilize Rock Paper Scissors to evaluate timing and psychology-- do you go first, mirror moves, or suddenly switch methods to confuse them?