[lycier]

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after 2nt,I rebid 3♣ as a regular stayman in my heart,but GIB regard 3♣ as 5 card plus ♣ suit ,now for me,how to look for 4-4 major fit in this situation?

[Bbradley62]

You want the strong hand to usually be declarer, so 3♣ is not asking the weak hand to name his major. Certainly, if you bid 3♥ over 2N, you'd want this to be natural, not a transfer to spades. On this hand, you bid 3♦ to show your diamond suit, then North bids 3♠ to show his four spades (since 2N denied five spades) and voila, you have found your fit.

[mr1303]

This is why the consensus is to bid 2D with the North hand.

[Lord Molyb]

Bbradley62, on 2013-December-08, 11:57, said:

You want the strong hand to usually be declarer, so 3♣ is not asking the weak hand to name his major. Certainly, if you bid 3♥ over 2N, you'd want this to be natural, not a transfer to spades. On this hand, you bid 3♦ to show your diamond suit, then North bids 3♠ to show his four spades (since 2N denied five spades) and voila, you have found your fit.

If you want the strong hand to be declarer why are you advocating using a method to make the weak hand declarer?

[1eyedjack]

Lord Molyb, on 2013-December-08, 13:31, said:

If you want the strong hand to be declarer why are you advocating using a method to make the weak hand declarer?

It is a question of balance.
At one extreme you could employ a system which dictates that responder is never allowed to be the first to bid a denomination that might conceivably end up as trumps. This would effectively limit his initial response to 2♣ as being from a selection of 3♣, 4♣, 5♣, 6♣ or 7♣. I don't expect any contest to my assertion that this would be absurd.

At another extreme you could employ a system in which parties bid their suits naturally, and if responder happens to declare some, well, rub of the green.

Between these extremes there is a multitude of possibilities which vary in complexity, vary in furthering the objectives of have having opener declare, and vary in the likely acceptance by the majority of human players.

On the OP hand, after 2♣-2N, there is a fair chance of Diamonds being the right strain, and a natural 3♦ serves the combined purpose of investigating that possibility while at the same time having that suit played by opener. Sure, if you happen to have a Spade fit then it gets to be played by responder, but just because your system is geared up to having the contract played by opener this is just a preference from which there will be exceptions, as part of that balance.