"it would be pretty easy for the players to just have a few codes which change the meaning of the signals." At some point, though, you might confuse your own t

"it would be pretty easy for the players to just have a few codes which change the meaning of the signals." At some point, though, you might confuse your own team more, than the other team, so I would keep it simple, especially if we are talking about a sport, that involves banging heads together.