Clubs have full authority to regulate conventions in games conducted solely at their clubs.
An overcall in a suit is considered natural if, by agreement, it shows four or more cards in that suit. A sequence of relay bids is defined as a system if, after an opening of one of a suit, it is started prior to opener's rebid. May NOT be part of a relay system. Psyching conventional suit responses, at the one or two level , to natural openings. Forcing pass systems.