BunnyGo, on 2012-August-09, 09:23, said:
This treatment can be very effective, but only if partner understands the implications.
It is (in my limited experience) usually played in conjunction with 1♠ being a hand that denies spades.
Thus with say xxx Jx KQ10xx Qxx and partner opening 1♣, with RHO overcalling 1♥, standard methods are stuck. We have enough that we want to be in the auction, yet we have no descriptive bid. Having 1♠ available for this type of hand serves a useful purpose. Imagine having to pass and then hearing LHO raise hearts.
We can use 2 level bids to deal with the 6+ spade length. Thus, in 2 of my partnerships, we use 2♥ as a transfer to 2♠, promising 6+ in length. Partner can play us for a weak hand, and we'll take more action later with a better hand.
After the double, if 4th hand passes, opener is expected to bid 1♠ with a 3 card holding, unless he has a reason to show another aspect of his hand...more on this below.
With 4 spades and a minimum, he bids 2♠...this 'gets you back to the field' compared to an uncontested auction in which responder had bid spades and we raised.
If 4th seat bids, then (depending on the auction and partnership agreement) opener can choose to raise spades to show 4 or to make a support double to show 3.
Properly handled, the partnership will usually be able to identify the degree of fit fairly well, unless the opps preempt beyond our support double range.
I don't play very often so I can't claim that the method is 'wonderful', since I have only a limited number of real life experiences with it, but it seems to me to be a useful method. In particular, the 1♠ bid comes up fairly often and I can say that it is a very useful gadget. Where I am uncertain is whether, in the long run, the undoubted cost of using double and 2♥ as indicated above is justified by the gains.
I should add that in one of the partnerships we play a weak 1N, which means that 1♣ is (quite often) based on a strong 1N hand, and now the transfer double and the transfer 2♥ both seem likely to work effectively, by right-siding spade contracts and keeping the overcaller on lead.
As for when opener should not show 3 spades....in my view it should be when opener has extras and, say, 3=1=5=4, or extra shape, say 3=0=5=5 or a single suiter with weak spades: Jxx xx AKJxxx Kx
So in the given sequence, I would expect a strong, in context, 3=1=5=4...say Kxx x AKxxx KQxx, catering to our holding AJxxx xxx Qxxx x or the like.