hirowla, on 2017-July-12, 18:10, said:
I'm trying to work out whether a heart bid after the club transfer should be natural, showing a control, showing a shortage or something else. I'm concerned that if it is natural, what happens if you don't have a 2nd suit (which is very possible as you are unlikely to bid like this unless you have 6+ clubs)?
I will deal with this one. Basically you should have 2 routes available. One school of thought is that you bid your one-suiters through a transfer and your 4M5m hands should then go a different route (such as Stayman). Using this method, it is normal for the next call by Responder to show shortage if they have one. The other school is for the minor-based 2-suited hands (4M-5m and 5m-5om, sometimes also 5m-4om depending on system details) to go through the minor suit transfer and for the one-suiters to have the alternative route. I personally do it this second way with a simple 3m response covering the one-suited hands.
There is not really a "best" way here. Each method has certain advantages and certain disadvantages. As always with NT structures, the important thing is that they fit together to make an efficient whole and cover the hand types that the partnership feel are most important.
In terms of the heart transfer route, second round transfers can be of use here. It is possible to incorporate 5
♥4+
♣ hands into the sequence 1NT - 2
♦; 2
♥ - 2
♠, which can sometimes save some space. Here, for example, Opener might continue 3
♣ showing a maximum with <4 clubs and <3 hearts and 3
♦ from Responder now shows a 5th club. When Opener now admits to their club fragment, it should be a simple matter to continue on.
Some others use the sequence 1NT - 2
♦; 2
♥ - 2NT to show 5+
♥ and 4+
♣, which would lead to a similar auction. Another former poster here, TWO4BRIDGE, created an entire conventional sub-system to deal with these 5+-5+ hands after NT openings, complete with 6KCB advances.
There really are a large number of realistic options available here and picking out any one of them as "best" without knowing your precise requirements would be foolhardy.