Fluffy, on 2013-June-22, 08:01, said:
I have this problem often because I don't play transfers over my 1NT opening, and I have to ask the directors if they want me to alert or not, in the world championship in Lille it took them 36 hours to answer the question althou I guess they weren't really worried about it.
The WBF rules tell us that "Conventional bids should be alerted, non-conventional bids should not.", so in theory natural bids (without a jump) should not be alerted.
However, most of your opponents will not have read the rules (it's only a World Championship, after all). They will naturally assume that transfers aren't alertable because "everyone" plays them, or because transfers aren't alertable in their home country, or because nobody else seems to be alerting them. When you make your natural bid they will assume it's a transfer.
The rules also say that "players must respect the spirit of the Policy as well as the letter". Presumably that means that you should make some effort to save the opponents from misunderstanding your bids (an admirable objective). Hence you should alert your natural responses anyway.
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Appart form having firm agreements, what if you are playing with a pick up partner?, would you alert when you have no agreement?
In the WBF that's easy: "Players are, however, expected to alert whenever there is doubt."
Both of these are a matter of regulation, so different jurisdictions will have different rules.