There’s a strategy to the childhood game. Many have studied the patterns of the competition. Much has been written on the topic. Most match ups start with a scissor/scissor tie. Stick with scissors if you wish to win.
Your opponent will expect you to choose the more aggressive choice of rock. So, he’ll inevitably choose paper, thinking he’ll beat you. You choose scissors. Scissors cut paper. You win.
And on rare occasions, scissors additionally beats rock. The night she’d finally had enough of his abuse was the evening he threw a rock from across the room.
She threw scissors. She won.