We should probably start to enforce(begin to count) the rule once a potential engagement "can" occur. For example no one can attack for at least 3-4 moves depending upon an opponents response. So we can start counting then. I think someone mentioned starting the counting after a few moves have started.Such as turn 15 or 20. The enemy cannot be engaged until proper reinforcements have been established. The volcano versions make for a more difficult attacking challenge. So perhaps waiting a little bit before starting the count. The open challenge is much easier to attack so a lower start count could be feasible.