rmnka447, on 2019-September-06, 10:52, said:
The question is if you still play Texas transfers over interference?
If you do, this hand is easy.
1 NT - (3 ♦) - 4 ♥
4 ♠ - ( P ) - 4 NT (1430)
5 ♦ - ( P ) - 7 NT
as 5 ♦ must show 3 keys because there aren't enough points left if opener has zero to bid 1 NT.
If you don't, then you must start with 3 ♠ which should be absolutely forcing. You'll need follow up agreements on the bidding that follows after 3 ♠, specifically what rebid by responder is the key card ask for ♠.
It is unwise to play texas over any interference higher than 3C.
With a major 2-suiter and a 3D overcall, one has to have 4D available to force opener to choose a major, which one may be passing or taking further, slam-oriented, action.
To see why, think of the alternatives with a big 2-suiter.
One can double, if one plays this as negative, which is a popular use. However, opener is allowed to pass, and may not be able to bid a major anyway, lacking 4. He may bid 3N, and over that 4M by advancer is non-forcing, and while 4D insists on a major, opener might not be bidding 3N...he may be passing the double (or bidding 4C over the double, and now is 4D majors or a cuebid in support?).
So a negative double runs a terrible downside risk when we have slam ambitions, or even simply game, where we have extra shape, and hence offence and no defence. Do we want to be on lead against 3D x'd with say KJxxxx QJxxxx void x?
Bid 3M? Yes, this is forcing, but what next? Maybe we have a 5-4 fit in the other major but opener will raise us with any 3 card support, and now we can't get to the better fit.
Or opener bids 3N...so now if we started with 3S, our 4H is not forcing...it is pass or correct (playing it forcing simply transposes the problem, since now we can't stop in 4H when it is right).
The solution is easy, and virtually cost-free: play 4D as both majors. I use switch for 3H/3S, but that is for one-suiters.
The only 'cost' is that if one doesn't use switch, responder has to bid his major at the 3-level (forcing) or the 4-level (to play), and now the lead comes through opener. That can cost, but in real life doesn't cost often. Responder is often short in diamonds, or opener has the Ace, or overcaller has AK, etc. It is relatively rare that having the lead through opener costs, and if that is your worry, play switch, where responder's 3H is spades, invite or better, and 3S is hearts, forcing.
With that in place, there is little need for texas. All one loses is the ability to show a mild slam try...with no slam interest, we are always just bidding game no matter our methods, and with strong slam interest, we can afford the 5-level.
'one of the great markers of the advance of human kindness is the howls you will hear from the Men of God' Johann Hari