3.5 Responding to 1NT Opening

A. pass

- HCP 5 points & below with a balanced hand

B. transfer

1. respond 2D with a 5 cards suit of Heart, pass afterward with HCP 6 points & below, open new suit with HCP 10 points & above, rebid 3H with 6 to 10 HCP

2. respond 2H with a 5 card suit of Spare,  pass afterward with HCP 6 points & below, open new suit with HCP 10 points & above, rebid 3S with 6 to 10 HCP

3. respond 2S with a 5 cards of Diamond or Club and with minimum 8 HCP*

C. Stayman**

1. respond 2C with 4 cards of Spare or Heart and raise up to level-3 if trump suit match, 2NT if trump suit not match with 8 to 10 HCP

2. respond 2C with 4 cards of Spare or Heart and direct raise up to game fi trump suit match, 3NT if trump suit not match with 10 to 15 HCP

3. respond 2C with 4 cards of Spare or Heart and open new suit or control bid** if trump suit match, 4NT start Blackwood convention** if trump suit not match with 15 HCP & up to try grand slam

D. 2NT

- a balance hand with 8 to 10 HCP and without any 4 cards major

E. 3NT

- a balance hand or with a 5-card minor with 10 to 15 HCP

* Be careful while using 2S for transfer, if your long suit is Club, expect your partner respond 3D, then you have go up to 4C, you better have at least 10 HCP to do this

** Please reference the chapter of special convention