If the following text does not appear in the rule The Masquerade, add it to the end:

An action that can only be undertaken once per player per Season is called a Seasonal Action.

Add a new rule to the ruleset titled Codebreaker:

As a seasonal action, any Elector may send a private message to the Doge where the message subject contains the word “codebreaker”.

A codebreaker message must contain no less than four Guesses, where each guess consists of the name of exactly one other Elector or Idle Elector, and exactly one valid secret faction name. An elector may not be named by multiple guesses in the same codebreaker message.

The Doge must, at their earliest convenience, reply exclusively to the sender of the codebreaker message with the following information regarding the relevant guesses:
- The numerical quantity of guesses where the named Elector belongs to the secret faction named in the same guess (the number of “correct guesses”).
- The numerical quantity of Electors named in any of the guesses that belong to a secret faction named in any of the guesses (the number of “potential pairs”).

The information in the codebreaker reply should be accurate as of the time the codebreaker message was sent to the Doge.

If any of the guesses in a codebreaker message are rendered invalid, either by containing an invalid Elector or secret faction name, then the Doge should disregard the guesses and notify the sender that their request was invalid. The sender may send a revised codebreaker message during that season.