Extract from the White Book: Section 171 Level 5 Permitted Conventions [C3+L4] 171

171.2 Highly Unusual Methods (HUMs)

Highly Unusual Methods may not be played. A Highly Unusual Method means any system that exhibits one or more of the following features, as a matter of partnership agreement:
(a)	A Pass in the opening position shows at least the values generally accepted for an opening bid of one, even if there are alternative weak possibilities.
(b)	By partnership agreement an opening bid at the one level may be weaker than pass.
(c)	By partnership agreement an opening bid at the one level may be made with values a king or more below average strength.
(d)	By partnership agreement an opening bid at the one level shows either length or shortage in a specified suit
(e)	By partnership agreement an opening bid at the one level shows either length in one suit or length in another.
EXCEPTION: one of a minor in a strong club or strong diamond system

MAIN MENU