I can think of a 4th type: clan or guild restricted pk. People have to join clans, cabals, guilds, whatever you want to call them in order to pk. Each clan has it's own rules and regulations about how to act, who to kill, etc. These may or may not be level restricted or arena restricted.
I'm familiar with pk, so finding a system isn't really the problem. The problem is my original question: How do you keep it from deteriorating? How do you keep your pk system from going from the original concept to one where everyone involved in pk only fights arranged fights? If you're a role playing mud where guilds have a purpose, how do you limit the number of people who join a guild simply because their friend is in it, and have no intentions of fighting at all? You could make up rules about it, but then you spend your time babysitting people to make sure they follow the rules, which doesn't sound like much fun to me.
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