Cascade, on 2014-March-11, 12:45, said:
You can't treat something as a convention when it does not meet the definition of convention. In this case a four card weak two does not come close to any simple reading of the definition of convention.
"A convention is defined as any call which, by partnership agreement, conveys a
meaning not necessarily related to the denomination named or, in the case of a
pass, double or redouble, the last denomination named."
In particular it is plainly obvious from this definition that it is independent of the level of the opening bid. So if four card majors are non conventional at the one level then they must also be non conventional at the two level etc.
I am sorry, your argument is so patently absurd as to almost defy description.
Throughout the history of bridge, bids above the level of one have conveyed special meanings. In the Official System (from the 1930s, I believe), the stronger the hand one had the higher one bid. The idea behind the Official System was soon discarded for bids above the 2 level, so that bids at the 3 level and upward showed progressively longer suits but less than opening values - in other words, what we now know as preemptive openings. 3 level opening bids were typically 7 card suits with less than opening values. 4 level opening bids were typically 8 card suits with less than opening values, and so on. Until the 1950s, nearly everyone played 2 level opening bids as game forcing and natural, typically showing 5+ card suits (but sometimes 4, usually when opener had a very strong 4441 hand, as no one opened 2NT with a singleton). Eventually, strong two bids gave way to weak 2 bids, which were typically based on a good 6 card suit with less than opening values. Now, for most players, the only remaining strong 2 bid is 2
♣.
One might say that these "special meanings" are conventional as they don't necessarily relate to the denomination named. There is nothing inherent in an opening 3 bid that says that it relates to a long suit and a weak hand. The same can be said about a weak 2 bid. But since these bids have such a long history and the treatment of the bids is so universally understood, they are not considered to be conventional. As has been pointed out previously, the ACBL has set suit length criteria for "natural" opening bids at various levels of opening bids - 3+ cards for one of a minor, 4+ cards for the one of a major, 5+ cards for the 2 level, 6+ cards for the 3 level. Anything not meeting these criteria will be considered not to be a "natural" opening bid, and, therefore, it will be considered to be a convention if the partnership opens these bids by agreement. Just because you don't believe that a below length 2 bid (or 3 bid, etc.) is not conventional doesn't make it so.
Given the long history of weak two bids in the ACBL, applying the "Potter Test" - "I know a weak 2 bid when I see one" - is actually reasonable. The criteria for a weak two bid are understood by the tournament playing public quite well. The definition quoted from The Bridge World is a workable definition. The ACBL criteria for expected minimum suit length for opening bids at various levels quoted in previous posts is pretty much universally followed. I understand, Wayne, that you are from New Zealand. Perhaps it is common in New Zealand for players to open "weak 2 bids" on 4 card holdings by partnership agreement. That is not the case here, and I suspect that if you tried to make your arguments before an ACBL appeals committee that you would be laughed out of the room.