playBunny: Some rule are conceptual ones, perfectly capable of being held in your head without requiring you to see them in print or on a web page.

Sure it can. And anyone can think of any rule, hold it in its pretty little head, and accuse others of cheating if they don't confirm to the rule. And then ask others to show them the rules that allow this behaviour, as you asked Anders. Here, this is what you wrote: She made an illegal move which is against the Brainking rules. Please, feel free to show me the bit where it says you can use just a single dice if it suits you.