My brother and I would play a variation of rock, paper, scissors, where, prior to making a play, you'd have to tell the other person what you would play though

My brother and I would play a variation of rock, paper, scissors, where, prior to making a play, you'd have to tell the other person what you would play though lying was acceptable. We felt like it added a psychological dimension to the game - but I'm not really sure how it affected play. Neither of us could reliably detect when the other was lying.