madongjun, on 2013-May-08, 00:37, said:
真是好方法,直接NT表示双张小;通过接力后再叫NT表示双张一大或者至少JT双张的支持。谢谢!
有一个疑问:同伴若是开叫的黑桃呢?(哈哈,贪心,又想让老师说出研究成果。)
Sorry, there are something wrongs with my keyboard now,so I have to type English to answer your questions,I think it is out of question even through you are digressing here.
This problem has been addressed by Les Bart using his "Bart" convention. After the bidding sequence:
1
♠ -pass - 1NT–pass-2♣ -pass-?
the responder bids two diamonds as an artificial forcing bid (alert). This sequence is used to show opener one of the following hands:
1. Five hearts and two spades. Responder plans to pass opener's rebid (hopefully two hearts).
2. A doubleton spade honor with9-11HCP.
Responder plansto correct two hearts to two spades, pass a rebid of two spades, or raise two notrump to three notrump.
3. A weak/invitational hand with a good diamond suit. Responder plans to bid three diamonds.
4. A good hand with a club raise. Responder plans to bid three clubs over partner's rebid.
5. A raise of two notrump with four clubs. Responder plans to bid two notrump.
All good hands start with two diamonds. The only disadvantage of the convention is that it does not allow the partnership to play in two diamonds. The advantage is that it limits all other bids at an early stage of the bidding.
For Example :
1-hand:
Plans to correct two hearts to two spades, pass if opener rebids spades, or raise two notrump to three notrump.
2-hand
Plans to correct either two heartsor two spades to two notrump.