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There are different abilities for the three Mafia members + an advocate.
Oh, never mind. In the initial version, I also had another role: an obvious blocker. In the end, I gave that ability to Elizabeth.
In general, the connection between blocking and ranks is that to prevent a murder, you need to block one specific Mafia member. The same applies here, as there is an obvious order of priority for the Mafia to kill: Gleb-Timmy (if he exists)-Stepan-Boleslav. Hey, Mafia, I'm outlining a strategy for you, so pay attention. x) Consider this the rank system. If you don't block Gleb, he'll still kill. If you kill him, Timmy moves into the first "rank," and so on.
But honestly, I don't really like this system. And I said from the start that I don't play standard Mafia.
Mona, sign up; I won't bite. =