[mw64ahw]

mw64ahw, on 2025-October-09, 00:27, said:

2♣ as natural or balanced, not 2/1 GF
Opener will bid 2♦ if minimum without 4♠.
2♠ then forces game asking opener to describe their hand further and in the process denies certain hand shapes.
Any other reply by opener suggests 14+hcp, excluding most balanced 12-14.

After 1♥-2♣-2♦-2♠
3♣ x5(4x)

Now
3♦ would ask for the minor and get a 3♠ response showing x54x
3♥ upwards sets trumps and with 4.5 mod. losers opposite ~7.5 the grand is in reach.
Planning ahead I choose
3♠ ctrl - 4♣ ctrl & 2+/3♥ honours
4♦ void or AKx(x) - 4♥ no further KCs to show
4♠ even KCs - 4N K♠
6♦ AKJx - 7♥

[pescetom]

 mike777, on 2025-October-11, 17:30, said:

Is your 2/1 style which is shown here pretty common in your country? 2H is 2+, does not confirm trumps?

6d shows first or second round control?

With some variations, it's pretty common among stronger level players. Some will always or usually chicken out in RKCB rather than Turbo, but the lower level control-bidding is fairly standard. Not everyone plays that 3NT after 3S is a "me too" control-bid (some play it as a natural retreat to NT and a few as Turbo or other).

A lot of players are prepared to respond 2H on 2 cards when they aren't sure what strain they want to play in and want to know more about the Opener's hand, or are concerned about assuming NT from their side. Whether or not the system considers 2H as promising 2+ (as mine does) or as nominally promising 3+ but not setting trumps definitively (as the FIGB system does) is a matter of semantics, at this point. Opener is not free to control-bid in hearts and Responder is free to set another strain including NT, unless Opener can rebid hearts fixing trumps.

The 6D control-bid nominally shows first or second level control, which has to be the K given that partner is known to hold the A. But it seemed likely that my Q might make all the difference and I would get no further opportunity to show it.