-If you are ahead in VP and can end the game on your turn, do so.
[Dwight]False[/Dwight]
Your opponent returned Bank to the top of his deck last turn. You can use Governor to remodel a Silver into the last Governor and 3 pile the game, but in spite of you 1 VP lead it would be a foolish move to do so.
You can modify the statement so it works, but it gets increasingly trivial.
-Open Potion if all cards have Potion in their cost.
This is depends on the kingdom because you are specifying a certain subset of possible kingdoms and saying that your rule definitely applies to those kingdoms.
Even so, you might be wrong in six player (if six player is really and truly a thing, I'm not positive it is).
-Don't open double Curse.
Maximum number of players, everyone before you purchased a Mountebank, you have a 3/4 opening and no reactions or trashing are available. You're playing with Intrigue and Dominion Base cards treasures, so the Coppers won't run out and you can actually build an engine that gets up to Provinces or even Colonies if you make sure you take on as few Coppers as possible. Enginey cards are available at a variety of costs, so no particular pile will run out, especially if some but not all players go for 6 point Fairgrounds. One of the enginey cards is a Menagerie that will greatly appreciate you minimizing your Copper intake. Duplicate curses are easier to discard.
-Play the game according to the rules in the rulebook.
That's vacuous. If you don't play the game according to the rules in the rulebook, technically speaking you are not playing Dominion at all. Depends on the kingdom is a phrase that governs different ways of playing dominion, not whether to play a game that -is- dominion at all.
-Don't viciously insult/attack your opponent.
"/" generally can be interpreted as an "or", so this is false. If Torturer is on the board, you should viciously attack your opponent. (as long as Torturer is a strong card on that board. It depends on the kingdom)