Opening Bidding
1♣
12~21, 3+♣
1♦
12~21, 3+♦
1♥
11~21, 5+♥. May have only 4♥ in 3rd/4th position.
1♠
11~21, 5+♠. May have only 4♠ in 3rd/4th position
1N
15~17, balance hand. May have 14 HCP with 5+ suit.
2♣
Over 22 value hand or 20~21 balance hand.
2X
Preemptive
2N
22~23, balance hand.
3X
Preemptive
3N
Gambling NT