[steve2005]

TWO4BRIDGE, on 2013-April-01, 17:26, said:

Only for the TWO 1C ... 2D reverse cases... NOT for any other .

so what does 1♦-1N-2♥-2♠ mean? i see its not 4th suit, but cant be natural

[TWO4BRIDGE]

steve2005, on 2013-April-02, 14:43, said:

so what does 1♦-1N-2♥-2♠ mean? i see its not 4th suit, but cant be natural

It looks like some version of "The Impossible Spade".
It might be covered by Fred G's souped-up version:

1D - 1NT
2H - 2S!
2NT! ( asks ) - ??
...................... 3C = good ♣ hand
...................... 3D = strong ♦ raise

If Responder had a lesser hand with long clubs, he would bid 3C directly over 2H.
Or if Responder had a lesser hand with Diam support, he would bid 3D directly over 2H .
Hence, there are 2-ways to bid 3C/3D.

Then again, there already are 2-ways using Leb3:
1D - 1NT
2H - Leb2NT! ( forces 3C for pass or correct )
3C! - pass/3D to play

Soooo, we are back to your good question. What is the best use for 2S ?
Perhaps 2S! should be an artificial weakness bid ... allowing Opener to possibly sign-off in 2NT.

[Zelandakh]

TWO4BRIDGE, on 2013-April-02, 15:52, said:

Soooo, we are back to your good question. What is the best use for 2S ?

How about simply 5 clubs? Something like

2♠ = 5 clubs
2NT = 6+ clubs
3♣ = 3+ diamonds
3♦ = 3 hearts
3♥ = asks for club stop
3♠ = asks for spade stop
3NT = to play

as a transfer scheme seems simple enough. Or, as Lebensohl

2♠ = 5 clubs
2NT = sign off in ♣/♦/♥, or asking for club stop
3♣ = 6+ clubs, GF
3♦ = 3+ diamonds, GF
3♥ = 3 hearts, GF
3♠ = asks for spade stop
3NT = to play

You could make 2♠ the weakness bid but I do not see the point; if we only have 4 clubs then we have a diamond fit. Anyone have any better ideas for the idle bids than checking for stoppers in the unbid suits?