Why are the rules so vague?

I was sitting here just wondering why the rules of this game are so shrouded in mystery. I mean how can one expect to play when one doesn’t know the rules. I then looked over all the sections of the Chaos Pool where the rules between the White and Black Guardian are even mentioned. They are also as vague as the rules seem to be on Lost. Unfortunately the rules were never fully explained in the Key to Time series so I hope that the writers of Lost will hopefully clue us in on them.

Excerpt from the Chaos Pool on the mentioning of the rules:
http://www.drwhoguide.com/who_bf119.htm

He points out that if the White Guardian gets the Key there will no longer be any disorder or free will in the Universe. He isn’t a Guardian of virtue, but a Guardian of control and domination, someone who follows the letter of the law but not the spirit of it. The White Guardian argues that chaos has no boundaries and says people can’t just make up the rules as they go along, but the Doctor says that having absolute certainty about everything is just another form of tyranny. Amy backs up the Doctor and when the Guardian accuses him of putting thoughts into her mind, she points out that he’s a teacher, not a dictator, and she’s able to make her own choices.

The recently revived freedom fighters, including President Astra and Captain Pargrave, are ordered by the nameless woman to defend the Chaos Pool and hold back the intruders, but it’s not long before they find themselves being overrun by the Teuthoidians. Zara pleads with the two Guardians to help and reluctantly they both agree to stop their supporters. In an instant, everyone else in the ante-chamber apart from Zara and Astra are frozen in time again. Zara suggests converting the castle back into the segment, but the White Guardian warns her that would destroy the Universe unless the other five segments are retrieved first. When she uses her Time Ring to go after Amy, the Black Guardian accuses her of breaking the rules, so he decides to revive his freedom fighters. In retaliation, the White Guardian revives the Teuthoidians…and the battle resumes!

The two Guardians continue their card game and the result so far show they’re evenly matched. But the Black Guardian warns his opponent that the rules of the game are about to change…