dorisga44, on 2018-April-03, 16:04, said:
Hi All,
Following a 1NT opening (strong) has anyone had any experience of playing:
2
♣ as 4+ hearts
2
♦ as 4+ spades ?
Would like to hear what responses you could do for this, and what does that mean for the rest of the structure over the 1NT opening?
Thanks in advance

I saw something like this that appears to work well.
2C* forces 2D to sign off in D/H/S contracts.
2D* is invite+ with 4+ Hs.
2H* is invite+ with 4+ Ss.
Opener accepts the 2 level transfer with a non max. hand.
Opener bids 2N with a max. and 2 cards in the transferred suit.
Opener bids 3* with a max. and 3 cards in the transferred suit.
When opener would pass an invite in normal methods, this one allows you to stop in 2M.
Holding both majors, responder bids 2C* and over the forced 2D* bid now bids 2N*(4-4Ms invite) or 3N*(4-4Ms)GF