RMB1, on 2011-January-23, 17:43, said:
My real difficulty is determining if there are logical alternatives to Pass. I think that a very large proportion of people faced with this auction would Pass because the odds are that partner has a weak two in spades (and has either forgotten the system or thinks he can pull 4♥ with an unsuitable hand). They might well assume that a strong two in spades would not risk 4♠ because it might sound like contract correction.
It would be difficult to find peers of NS with the same agreements and level of confidence in their agreements. So conducting a poll would be fraught.
The basic problem is that the overloaded North/South version of the Multi is totally unplayable, made even worse when the pair has not properly discussed the meaning of some of the responses.
Certainly many players in the North position would be not entirely sure what hand type would be shown by 4♠. In this case, the TD has to tread carefully. I would want North to explain the meaning of 4♥. "To play," he'll say. "To play opposite a weak two in spades?" I'll further enquire. Then I'll gague his reaction.
In practice, this is the sort of auction where there could be issues with tempo, especially if North is not in the habit of holding out the 'stop' card and/or East is not in the habit of waiting for the full 10 seconds. A fast 4♠ is more likely to deliver a weak two in spades that prefers 4♠ to 4♥, whilst a ponderous 4♠ gives sends the messgae "Why have you just pre-empted the auction? What on earth am I supposed to bid with an Acol 2 in spades here?"