You're free to add additional prohibitions on communication as a house rule I guess, but the only prohibition in the rule book I've seen is that the clue giver'

You're free to add additional prohibitions on communication as a house rule I guess, but the only prohibition in the rule book I've seen is that the clue giver's speech must consist exclusively of clues (and private consultation with the other clue giver). The clue giver is free to adjust their clue in reaction to anything they hear, and guessers can speak freely. Important: the clue giver cannot acknowledge the instruction during gameplay. That would certainly extend beyond giving a clue! The guessers must know that their clue giver can play this way prior to the game commencing. Edit: I just consulted the rules and this is the most relevant section: > If you are a field operative, you should focus on the table when you are making your guesses. Do not make eye contact with the spymaster while you are guessing. This will help you avoid nonverbal cues. > When your information is strictly limited to what can be conveyed with one word and one number, you are playing in the spirit of the game. The author's use of the pronoun "you/your" switches from field ops in that first paragraph to spymasters in that second paragraph, confusingly. With that in mind, it boils down to this: field ops cannot seek non-clue information from spymasters, and spymasters cannot convey non-clue information. The strategy I'm suggesting involves neither!