No 5 card or longer suit. Major All these responses limit the responders hand to at most 13 hcp . Opener Responder 2 of the Major shown by responder sets the trump suit and you can use whatever follow up system you wish from there. If the hand is played in NT openers hand is completly undisclosed to the opponents. This is done by having reponder bid 2c over the opener's 1NT rebid and opener can relay with 2d to learn where the singleton is.
Responder bids the suit below the singleton.
The limit for responder in this sequence is 9-13hcp. 2nt rebid by opener asks for the singleton and again this is shown by bidding the suit below it. Last Updated 23rd October 1996.