Hi, 1. I would recommend using 2♣ to show both majors 2NT to show both minors, DBL to show 15+ HCP, and all other bids are natural. After 2♣ your partner may bid 2♦ to ask for your better major. This is very simple defence which will work very well most of the time. 2.If I understand correctly partner open 1NT and they doubled. I would suggest that all your bids now are natural and weak. With a good hand you can redouble or pass 1NTX.