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
"Blue").
Examples
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
above.