[ketsu]

You can’t have conventional rules and new ones at the same time.

You don't understand the meaning of convention. Look it up.

[little jeremiah]

So what do you mean by “convention”?

Miriam Webster online:

3 a : usage or custom especially in social matters

b : a rule of conduct or behavior

c : a practice in bidding or playing that conveys information between partners in a card game (as bridge)

d : an established technique, practice, or device (as in the theater)

[metmom]

On the contrary, I’m not ignoring some of the definitions of the word as you are.