Classification of  Systems


Systems material will be identified by one or more of the following:

(i)   A coloured sticker;

(ii)  The appropriate name colour;

(iii)  A check mark on a convention card next to the

appropriate colour – in keeping with the following descriptions:

Green   Natual

Blue     Strong Club/Strong Diamond, where one club/ one

diamond is always strong

Red      Artificial. This category includes all artificial systems that

do not fall under the definition of Highly Unusual Methods

(HUM) systems (see definition at Paragraph 7 above),

other than Strong Club/Strong Diamond Systems (See




would be a system where one club shows one of three

types – a natural club suit, a balanced hand of a specific

range, or a Strong Club opener, or a system in which the

basic methods (other than the no trump range) vary

according to position, vulnerability and the like, or a

system that uses conventional “weak” or “multi-

meaning” bids (with or without some weak option) in

potentially contestable auctions, other than those

described in the main part of the WBF Convention

Booklet (copies available seperately)


Yellow     Highly Unusual Methods (HUM) as defined in Paragraph 7



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