It doesn't even require physical representation. You can play it verbally, or if that results in simultaneity issues, each player separately says their play fo

It doesn't even require physical representation. You can play it verbally, or if that results in simultaneity issues, each player separately says their play for the next round to a judge. Hell, if the players are far enough away from each other and shouting out their answers, you can solve the simultaneity issue. By the time you've heard the other player's move you're already halfway through saying your own move, and can't pretend you were going to say something else.