Alternate Identity

V20 and M20 have contradicting rules for how Alternate Identity works. The V20 version, being very abstract, leaves characters who take it vulnerable to inconsistent implementation by STs. The M20 version is basically worthless if you think through the mechanics. We use our own rules, as follows.

If someone wants to attempt to crack another character's Alternate Identity, they must spend 1 Downtime to make the attempt.

The Investigator and the Target will make a resisted roll to see if the ID is broken. The Investigator rolls Highest Mental + Investigation against a difficulty equal to Target's Alternate ID + 3.

The Target rolls Highest Mental or Social + Higher of Subterfuge or Alternate ID against a difficulty equal to Investigator's Investigation + 3.

Target's successes eat the Investigator's successes.

If the remaining successes are greater than the Target's Alternate ID rating, the ID is broken. Otherwise, the ID is solid as far as the Investigator is concerned.