DavidKok, on 2026-September-05, 00:48, said:
I have played 1♣-1NT and 1♦-1NT as GFR before. I think it's not very good, but it was fun.
As I have pointed out on here many times, making your primary GFR 1
♦ - 1
♥; 1
♠ - 1NT is just much more efficient than using the direct 1NT response. You can improve it a little more beyond that by switching to an unbalanced diamond. Using 1NT as a GFR over a 1
♣ opening (nearly twice as many hand types) just seems like a really bad idea.
As far as 2-over-1 follow-up structures go, there used to be some debate here about Hardy vs Lawrence but as I have not seen any such threads for a while, perhaps one or the other has won out in America. It's not a system I personally play with anyone, so I am not even close to an authority, but my recollection is that the 1
♦ - 2
♣ auction was a bit of a flash point between the 2 approaches. That might explain the differences of opinion expressed here.