The general rule in licencing weak openings seems to be that at least one suit is specified, although EBU level four (for example) permit variation of this (and the Multi 2 is of course widely used.
Current WBF regs ...
2.3 Brown Sticker Conventions and Treatment
The following conventions or treatments are categorised as 'Brown Sticker':a) Any opening bid of two clubs through three spades that:
... i) could be weak (may by agreement be made with values below average strength) and
... ii) does not promise at least four cards in a known suit.Exception The bid always shows at least four cards in a known suit if it is weak. If the bid does not show a known four card suit it must show a hand a king or more over average strength. (Explanation: Where all the weak meanings show at least four cards in one known suit, and the strong meanings show a hand with a king or more above average strength, it is not a Brown Sticker Convention).
Exception A two level opening bid in a minor showing a weak two in either major, whether with or without the option of strong hand types, as described in the WBF Conventions Booklet.
b) {snip overcall definitions ..}
c) Any 'weak' two-suited bids at the two or three level that may by agreement be made with three cards or fewer in one of the suits.
d,e) {snip psych controls; strong opening, and Brown sticker defence ..}
This page contains methods outwith the above WBF regulations.
I have a page Mainstream two styles and of accepted exotic methods. There is an index for specific subtypes.
www.chrisryall.net/bridge/weak.two/brown-regulations.htm © Chris Ryall 1987-2008
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