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Per ACBL General Conditions of Contest:
Carding Agreements: A pair may not elect to have no agreement when it comes to carding. There have been pairs that say they just play random leads or that they lead the card closest to their thumb. They must decide on a carding agreement and mark their convention cards accordingly. Of course, some leeway needs to be given to fill-in pairs or very last minute partnerships.
From the ACBL Convention Chart:
Dual-message carding strategies are not approved except on each defender’s first discard. Except for the first discard only right-side-up or upside-down card ordering strategies are approved. Encrypted signals are not approved. In addition, a pair may be prohibited from playing any method (such as suit preference systems at trick one), when they are deemed to be playing it in a manner which is not compatible with the maintenance of proper tempo (much like dual message signals). This decision may be appealed to the tournament committee.